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Annotation of src/lib/libedit/readline.c, Revision 1.59

1.59    ! christos    1: /*     $NetBSD: readline.c,v 1.58 2005/07/14 15:00:58 christos Exp $   */
1.1       christos    2:
                      3: /*-
                      4:  * Copyright (c) 1997 The NetBSD Foundation, Inc.
                      5:  * All rights reserved.
                      6:  *
                      7:  * This code is derived from software contributed to The NetBSD Foundation
                      8:  * by Jaromir Dolecek.
                      9:  *
                     10:  * Redistribution and use in source and binary forms, with or without
                     11:  * modification, are permitted provided that the following conditions
                     12:  * are met:
                     13:  * 1. Redistributions of source code must retain the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer.
                     15:  * 2. Redistributions in binary form must reproduce the above copyright
                     16:  *    notice, this list of conditions and the following disclaimer in the
                     17:  *    documentation and/or other materials provided with the distribution.
                     18:  * 3. All advertising materials mentioning features or use of this software
                     19:  *    must display the following acknowledgement:
                     20:  *     This product includes software developed by the NetBSD
                     21:  *     Foundation, Inc. and its contributors.
                     22:  * 4. Neither the name of The NetBSD Foundation nor the names of its
                     23:  *    contributors may be used to endorse or promote products derived
                     24:  *    from this software without specific prior written permission.
                     25:  *
                     26:  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
                     27:  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
                     28:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
                     29:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
                     30:  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
                     31:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
                     32:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
                     33:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
                     34:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
                     35:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
                     36:  * POSSIBILITY OF SUCH DAMAGE.
                     37:  */
                     38:
1.20      christos   39: #include "config.h"
1.1       christos   40: #if !defined(lint) && !defined(SCCSID)
1.59    ! christos   41: __RCSID("$NetBSD: readline.c,v 1.58 2005/07/14 15:00:58 christos Exp $");
1.1       christos   42: #endif /* not lint && not SCCSID */
                     43:
                     44: #include <sys/types.h>
                     45: #include <sys/stat.h>
                     46: #include <stdio.h>
                     47: #include <dirent.h>
                     48: #include <string.h>
                     49: #include <pwd.h>
                     50: #include <ctype.h>
                     51: #include <stdlib.h>
                     52: #include <unistd.h>
                     53: #include <limits.h>
1.38      christos   54: #include <errno.h>
                     55: #include <fcntl.h>
                     56: #ifdef HAVE_VIS_H
1.35      christos   57: #include <vis.h>
1.38      christos   58: #else
                     59: #include "np/vis.h"
                     60: #endif
1.27      christos   61: #ifdef HAVE_ALLOCA_H
                     62: #include <alloca.h>
                     63: #endif
1.45      christos   64: #include "el.h"
                     65: #include "fcns.h"              /* for EL_NUM_FCNS */
1.1       christos   66: #include "histedit.h"
1.17      jdolecek   67: #include "readline/readline.h"
1.53      dsl        68: #include "filecomplete.h"
1.1       christos   69:
                     70: /* for rl_complete() */
1.40      christos   71: #define TAB            '\r'
1.1       christos   72:
                     73: /* see comment at the #ifdef for sense of this */
1.40      christos   74: /* #define GDB_411_HACK */
1.1       christos   75:
                     76: /* readline compatibility stuff - look at readline sources/documentation */
                     77: /* to see what these variables mean */
1.11      lukem      78: const char *rl_library_version = "EditLine wrapper";
1.20      christos   79: static char empty[] = { '\0' };
                     80: static char expand_chars[] = { ' ', '\t', '\n', '=', '(', '\0' };
                     81: static char break_chars[] = { ' ', '\t', '\n', '"', '\\', '\'', '`', '@', '$',
                     82:     '>', '<', '=', ';', '|', '&', '{', '(', '\0' };
                     83: char *rl_readline_name = empty;
1.11      lukem      84: FILE *rl_instream = NULL;
                     85: FILE *rl_outstream = NULL;
                     86: int rl_point = 0;
                     87: int rl_end = 0;
                     88: char *rl_line_buffer = NULL;
1.55      agc        89: VCPFunction *rl_linefunc = NULL;
1.38      christos   90: int rl_done = 0;
                     91: VFunction *rl_event_hook = NULL;
1.11      lukem      92:
                     93: int history_base = 1;          /* probably never subject to change */
                     94: int history_length = 0;
                     95: int max_input_history = 0;
                     96: char history_expansion_char = '!';
                     97: char history_subst_char = '^';
1.20      christos   98: char *history_no_expand_chars = expand_chars;
1.11      lukem      99: Function *history_inhibit_expansion_function = NULL;
1.40      christos  100: char *history_arg_extract(int start, int end, const char *str);
1.11      lukem     101:
                    102: int rl_inhibit_completion = 0;
                    103: int rl_attempted_completion_over = 0;
1.20      christos  104: char *rl_basic_word_break_characters = break_chars;
1.11      lukem     105: char *rl_completer_word_break_characters = NULL;
                    106: char *rl_completer_quote_characters = NULL;
1.34      christos  107: Function *rl_completion_entry_function = NULL;
1.11      lukem     108: CPPFunction *rl_attempted_completion_function = NULL;
1.32      christos  109: Function *rl_pre_input_hook = NULL;
                    110: Function *rl_startup1_hook = NULL;
                    111: Function *rl_getc_function = NULL;
                    112: char *rl_terminal_name = NULL;
                    113: int rl_already_prompted = 0;
                    114: int rl_filename_completion_desired = 0;
                    115: int rl_ignore_completion_duplicates = 0;
1.39      christos  116: int rl_catch_signals = 1;
1.32      christos  117: VFunction *rl_redisplay_function = NULL;
1.33      christos  118: Function *rl_startup_hook = NULL;
1.34      christos  119: VFunction *rl_completion_display_matches_hook = NULL;
1.33      christos  120: VFunction *rl_prep_term_function = NULL;
                    121: VFunction *rl_deprep_term_function = NULL;
1.1       christos  122:
1.12      jdolecek  123: /*
1.32      christos  124:  * The current prompt string.
                    125:  */
                    126: char *rl_prompt = NULL;
                    127: /*
1.12      jdolecek  128:  * This is set to character indicating type of completion being done by
                    129:  * rl_complete_internal(); this is available for application completion
                    130:  * functions.
                    131:  */
                    132: int rl_completion_type = 0;
                    133:
                    134: /*
                    135:  * If more than this number of items results from query for possible
                    136:  * completions, we ask user if they are sure to really display the list.
                    137:  */
                    138: int rl_completion_query_items = 100;
                    139:
                    140: /*
1.15      jdolecek  141:  * List of characters which are word break characters, but should be left
                    142:  * in the parsed text when it is passed to the completion function.
                    143:  * Shell uses this to help determine what kind of completing to do.
1.12      jdolecek  144:  */
1.53      dsl       145: char *rl_special_prefixes = NULL;
1.15      jdolecek  146:
                    147: /*
                    148:  * This is the character appended to the completed words if at the end of
                    149:  * the line. Default is ' ' (a space).
                    150:  */
                    151: int rl_completion_append_character = ' ';
                    152:
                    153: /* stuff below is used internally by libedit for readline emulation */
                    154:
1.1       christos  155: static History *h = NULL;
                    156: static EditLine *e = NULL;
1.35      christos  157: static Function *map[256];
1.1       christos  158:
                    159: /* internal functions */
1.11      lukem     160: static unsigned char    _el_rl_complete(EditLine *, int);
1.46      christos  161: static unsigned char    _el_rl_tstp(EditLine *, int);
1.11      lukem     162: static char            *_get_prompt(EditLine *);
1.59    ! christos  163: static int              _getc_function(EditLine *, char *);
1.11      lukem     164: static HIST_ENTRY      *_move_history(int);
1.40      christos  165: static int              _history_expand_command(const char *, size_t, size_t,
                    166:     char **);
1.11      lukem     167: static char            *_rl_compat_sub(const char *, const char *,
1.40      christos  168:     const char *, int);
1.38      christos  169: static int              _rl_event_read_char(EditLine *, char *);
1.49      christos  170: static void             _rl_update_pos(void);
1.1       christos  171:
1.5       christos  172:
                    173: /* ARGSUSED */
1.1       christos  174: static char *
1.30      christos  175: _get_prompt(EditLine *el __attribute__((__unused__)))
1.1       christos  176: {
1.32      christos  177:        rl_already_prompted = 1;
                    178:        return (rl_prompt);
1.1       christos  179: }
                    180:
1.11      lukem     181:
1.1       christos  182: /*
                    183:  * generic function for moving around history
                    184:  */
1.2       christos  185: static HIST_ENTRY *
1.11      lukem     186: _move_history(int op)
1.1       christos  187: {
                    188:        HistEvent ev;
                    189:        static HIST_ENTRY rl_he;
                    190:
                    191:        if (history(h, &ev, op) != 0)
                    192:                return (HIST_ENTRY *) NULL;
                    193:
                    194:        rl_he.line = ev.str;
1.40      christos  195:        rl_he.data = NULL;
1.1       christos  196:
1.11      lukem     197:        return (&rl_he);
1.1       christos  198: }
                    199:
                    200:
1.7       simonb    201: /*
1.59    ! christos  202:  * read one key from user defined input function
        !           203:  */
        !           204: static int
        !           205: _getc_function(EditLine *el, char *c)
        !           206: {
        !           207:        int i;
        !           208:
        !           209:        i = (*rl_getc_function)(NULL, 0);
        !           210:        if (i == -1)
        !           211:                return 0;
        !           212:        *c = i;
        !           213:        return 1;
        !           214: }
        !           215:
        !           216:
        !           217: /*
1.7       simonb    218:  * READLINE compatibility stuff
1.1       christos  219:  */
                    220:
                    221: /*
                    222:  * initialize rl compat stuff
                    223:  */
                    224: int
1.11      lukem     225: rl_initialize(void)
1.1       christos  226: {
                    227:        HistEvent ev;
                    228:        const LineInfo *li;
1.18      christos  229:        int editmode = 1;
                    230:        struct termios t;
1.1       christos  231:
                    232:        if (e != NULL)
                    233:                el_end(e);
                    234:        if (h != NULL)
                    235:                history_end(h);
                    236:
                    237:        if (!rl_instream)
                    238:                rl_instream = stdin;
                    239:        if (!rl_outstream)
                    240:                rl_outstream = stdout;
1.18      christos  241:
                    242:        /*
                    243:         * See if we don't really want to run the editor
                    244:         */
                    245:        if (tcgetattr(fileno(rl_instream), &t) != -1 && (t.c_lflag & ECHO) == 0)
                    246:                editmode = 0;
                    247:
1.4       christos  248:        e = el_init(rl_readline_name, rl_instream, rl_outstream, stderr);
1.18      christos  249:
                    250:        if (!editmode)
                    251:                el_set(e, EL_EDITMODE, 0);
1.1       christos  252:
                    253:        h = history_init();
                    254:        if (!e || !h)
1.11      lukem     255:                return (-1);
1.1       christos  256:
1.4       christos  257:        history(h, &ev, H_SETSIZE, INT_MAX);    /* unlimited */
1.1       christos  258:        history_length = 0;
                    259:        max_input_history = INT_MAX;
                    260:        el_set(e, EL_HIST, history, h);
                    261:
1.59    ! christos  262:        /* setup getc function if valid */
        !           263:        if (rl_getc_function)
        !           264:                el_set(e, EL_GETCFN, _getc_function);
        !           265:
1.1       christos  266:        /* for proper prompt printing in readline() */
1.32      christos  267:        rl_prompt = strdup("");
                    268:        if (rl_prompt == NULL) {
1.23      christos  269:                history_end(h);
                    270:                el_end(e);
                    271:                return -1;
                    272:        }
1.1       christos  273:        el_set(e, EL_PROMPT, _get_prompt);
1.39      christos  274:        el_set(e, EL_SIGNAL, rl_catch_signals);
1.1       christos  275:
                    276:        /* set default mode to "emacs"-style and read setting afterwards */
                    277:        /* so this can be overriden */
                    278:        el_set(e, EL_EDITOR, "emacs");
1.32      christos  279:        if (rl_terminal_name != NULL)
                    280:                el_set(e, EL_TERMINAL, rl_terminal_name);
                    281:        else
                    282:                el_get(e, EL_TERMINAL, &rl_terminal_name);
1.1       christos  283:
1.12      jdolecek  284:        /*
1.35      christos  285:         * Word completion - this has to go AFTER rebinding keys
1.12      jdolecek  286:         * to emacs-style.
                    287:         */
1.1       christos  288:        el_set(e, EL_ADDFN, "rl_complete",
1.35      christos  289:            "ReadLine compatible completion function",
1.11      lukem     290:            _el_rl_complete);
1.1       christos  291:        el_set(e, EL_BIND, "^I", "rl_complete", NULL);
1.46      christos  292:
                    293:        /*
                    294:         * Send TSTP when ^Z is pressed.
                    295:         */
                    296:        el_set(e, EL_ADDFN, "rl_tstp",
                    297:            "ReadLine compatible suspend function",
                    298:            _el_rl_tstp);
                    299:        el_set(e, EL_BIND, "^Z", "rl_tstp", NULL);
1.12      jdolecek  300:
1.1       christos  301:        /* read settings from configuration file */
                    302:        el_source(e, NULL);
                    303:
1.12      jdolecek  304:        /*
                    305:         * Unfortunately, some applications really do use rl_point
                    306:         * and rl_line_buffer directly.
                    307:         */
1.1       christos  308:        li = el_line(e);
1.20      christos  309:        /* a cheesy way to get rid of const cast. */
                    310:        rl_line_buffer = memchr(li->buffer, *li->buffer, 1);
1.49      christos  311:        _rl_update_pos();
1.1       christos  312:
1.32      christos  313:        if (rl_startup_hook)
                    314:                (*rl_startup_hook)(NULL, 0);
                    315:
1.11      lukem     316:        return (0);
1.1       christos  317: }
                    318:
1.11      lukem     319:
1.1       christos  320: /*
                    321:  * read one line from input stream and return it, chomping
                    322:  * trailing newline (if there is any)
                    323:  */
                    324: char *
                    325: readline(const char *prompt)
                    326: {
                    327:        HistEvent ev;
1.3       thorpej   328:        int count;
1.1       christos  329:        const char *ret;
1.20      christos  330:        char *buf;
1.38      christos  331:        static int used_event_hook;
1.1       christos  332:
                    333:        if (e == NULL || h == NULL)
                    334:                rl_initialize();
                    335:
1.38      christos  336:        rl_done = 0;
                    337:
1.9       jdolecek  338:        /* update prompt accordingly to what has been passed */
1.11      lukem     339:        if (!prompt)
                    340:                prompt = "";
1.32      christos  341:        if (strcmp(rl_prompt, prompt) != 0) {
                    342:                free(rl_prompt);
                    343:                rl_prompt = strdup(prompt);
                    344:                if (rl_prompt == NULL)
1.23      christos  345:                        return NULL;
1.1       christos  346:        }
1.32      christos  347:
                    348:        if (rl_pre_input_hook)
                    349:                (*rl_pre_input_hook)(NULL, 0);
                    350:
1.38      christos  351:        if (rl_event_hook && !(e->el_flags&NO_TTY)) {
                    352:                el_set(e, EL_GETCFN, _rl_event_read_char);
                    353:                used_event_hook = 1;
                    354:        }
                    355:
                    356:        if (!rl_event_hook && used_event_hook) {
                    357:                el_set(e, EL_GETCFN, EL_BUILTIN_GETCFN);
                    358:                used_event_hook = 0;
                    359:        }
                    360:
1.32      christos  361:        rl_already_prompted = 0;
                    362:
1.1       christos  363:        /* get one line from input stream */
                    364:        ret = el_gets(e, &count);
                    365:
                    366:        if (ret && count > 0) {
1.5       christos  367:                int lastidx;
1.1       christos  368:
1.20      christos  369:                buf = strdup(ret);
1.23      christos  370:                if (buf == NULL)
                    371:                        return NULL;
1.1       christos  372:                lastidx = count - 1;
1.20      christos  373:                if (buf[lastidx] == '\n')
                    374:                        buf[lastidx] = '\0';
1.1       christos  375:        } else
1.20      christos  376:                buf = NULL;
1.1       christos  377:
                    378:        history(h, &ev, H_GETSIZE);
                    379:        history_length = ev.num;
                    380:
1.20      christos  381:        return buf;
1.1       christos  382: }
                    383:
                    384: /*
                    385:  * history functions
                    386:  */
                    387:
                    388: /*
                    389:  * is normally called before application starts to use
                    390:  * history expansion functions
                    391:  */
                    392: void
1.11      lukem     393: using_history(void)
1.1       christos  394: {
                    395:        if (h == NULL || e == NULL)
                    396:                rl_initialize();
                    397: }
                    398:
1.11      lukem     399:
1.1       christos  400: /*
                    401:  * substitute ``what'' with ``with'', returning resulting string; if
1.29      wiz       402:  * globally == 1, substitutes all occurrences of what, otherwise only the
1.1       christos  403:  * first one
                    404:  */
1.11      lukem     405: static char *
                    406: _rl_compat_sub(const char *str, const char *what, const char *with,
                    407:     int globally)
                    408: {
1.40      christos  409:        const   char    *s;
                    410:        char    *r, *result;
                    411:        size_t  len, with_len, what_len;
1.1       christos  412:
1.40      christos  413:        len = strlen(str);
                    414:        with_len = strlen(with);
                    415:        what_len = strlen(what);
                    416:
                    417:        /* calculate length we need for result */
                    418:        s = str;
                    419:        while (*s) {
                    420:                if (*s == *what && !strncmp(s, what, what_len)) {
                    421:                        len += with_len - what_len;
                    422:                        if (!globally)
                    423:                                break;
                    424:                        s += what_len;
                    425:                } else
                    426:                        s++;
                    427:        }
                    428:        r = result = malloc(len + 1);
1.23      christos  429:        if (result == NULL)
                    430:                return NULL;
1.40      christos  431:        s = str;
                    432:        while (*s) {
                    433:                if (*s == *what && !strncmp(s, what, what_len)) {
                    434:                        (void)strncpy(r, with, with_len);
                    435:                        r += with_len;
                    436:                        s += what_len;
                    437:                        if (!globally) {
                    438:                                (void)strcpy(r, s);
                    439:                                return(result);
1.1       christos  440:                        }
1.40      christos  441:                } else
                    442:                        *r++ = *s++;
                    443:        }
                    444:        *r = 0;
                    445:        return(result);
                    446: }
                    447:
                    448: static char    *last_search_pat;       /* last !?pat[?] search pattern */
                    449: static char    *last_search_match;     /* last !?pat[?] that matched */
                    450:
                    451: const char *
                    452: get_history_event(const char *cmd, int *cindex, int qchar)
                    453: {
                    454:        int idx, sign, sub, num, begin, ret;
                    455:        size_t len;
                    456:        char    *pat;
                    457:        const char *rptr;
                    458:        HistEvent ev;
                    459:
                    460:        idx = *cindex;
                    461:        if (cmd[idx++] != history_expansion_char)
                    462:                return(NULL);
                    463:
                    464:        /* find out which event to take */
                    465:        if (cmd[idx] == history_expansion_char || cmd[idx] == 0) {
                    466:                if (history(h, &ev, H_FIRST) != 0)
                    467:                        return(NULL);
                    468:                *cindex = cmd[idx]? (idx + 1):idx;
                    469:                return(ev.str);
                    470:        }
                    471:        sign = 0;
                    472:        if (cmd[idx] == '-') {
                    473:                sign = 1;
                    474:                idx++;
                    475:        }
                    476:
                    477:        if ('0' <= cmd[idx] && cmd[idx] <= '9') {
                    478:                HIST_ENTRY *rl_he;
                    479:
                    480:                num = 0;
                    481:                while (cmd[idx] && '0' <= cmd[idx] && cmd[idx] <= '9') {
                    482:                        num = num * 10 + cmd[idx] - '0';
                    483:                        idx++;
                    484:                }
                    485:                if (sign)
                    486:                        num = history_length - num + 1;
                    487:
                    488:                if (!(rl_he = history_get(num)))
                    489:                        return(NULL);
                    490:
                    491:                *cindex = idx;
                    492:                return(rl_he->line);
                    493:        }
                    494:        sub = 0;
                    495:        if (cmd[idx] == '?') {
                    496:                sub = 1;
                    497:                idx++;
                    498:        }
                    499:        begin = idx;
                    500:        while (cmd[idx]) {
                    501:                if (cmd[idx] == '\n')
                    502:                        break;
                    503:                if (sub && cmd[idx] == '?')
                    504:                        break;
                    505:                if (!sub && (cmd[idx] == ':' || cmd[idx] == ' '
                    506:                                    || cmd[idx] == '\t' || cmd[idx] == qchar))
                    507:                        break;
                    508:                idx++;
                    509:        }
                    510:        len = idx - begin;
                    511:        if (sub && cmd[idx] == '?')
                    512:                idx++;
                    513:        if (sub && len == 0 && last_search_pat && *last_search_pat)
                    514:                pat = last_search_pat;
                    515:        else if (len == 0)
                    516:                return(NULL);
                    517:        else {
                    518:                if ((pat = malloc(len + 1)) == NULL)
                    519:                        return NULL;
                    520:                (void)strncpy(pat, cmd + begin, len);
                    521:                pat[len] = '\0';
                    522:        }
                    523:
                    524:        if (history(h, &ev, H_CURR) != 0) {
                    525:                if (pat != last_search_pat)
                    526:                        free(pat);
                    527:                return (NULL);
                    528:        }
                    529:        num = ev.num;
                    530:
                    531:        if (sub) {
                    532:                if (pat != last_search_pat) {
                    533:                        if (last_search_pat)
                    534:                                free(last_search_pat);
                    535:                        last_search_pat = pat;
1.1       christos  536:                }
1.40      christos  537:                ret = history_search(pat, -1);
                    538:        } else
                    539:                ret = history_search_prefix(pat, -1);
                    540:
                    541:        if (ret == -1) {
                    542:                /* restore to end of list on failed search */
                    543:                history(h, &ev, H_FIRST);
                    544:                (void)fprintf(rl_outstream, "%s: Event not found\n", pat);
                    545:                if (pat != last_search_pat)
                    546:                        free(pat);
                    547:                return(NULL);
                    548:        }
                    549:
                    550:        if (sub && len) {
                    551:                if (last_search_match && last_search_match != pat)
                    552:                        free(last_search_match);
                    553:                last_search_match = pat;
                    554:        }
                    555:
                    556:        if (pat != last_search_pat)
                    557:                free(pat);
                    558:
                    559:        if (history(h, &ev, H_CURR) != 0)
                    560:                return(NULL);
                    561:        *cindex = idx;
                    562:        rptr = ev.str;
                    563:
                    564:        /* roll back to original position */
                    565:        (void)history(h, &ev, H_SET, num);
1.1       christos  566:
1.40      christos  567:        return rptr;
1.1       christos  568: }
                    569:
                    570: /*
                    571:  * the real function doing history expansion - takes as argument command
                    572:  * to do and data upon which the command should be executed
                    573:  * does expansion the way I've understood readline documentation
                    574:  *
                    575:  * returns 0 if data was not modified, 1 if it was and 2 if the string
                    576:  * should be only printed and not executed; in case of error,
                    577:  * returns -1 and *result points to NULL
                    578:  * it's callers responsibility to free() string returned in *result
                    579:  */
                    580: static int
1.40      christos  581: _history_expand_command(const char *command, size_t offs, size_t cmdlen,
                    582:     char **result)
1.11      lukem     583: {
1.40      christos  584:        char *tmp, *search = NULL, *aptr;
                    585:        const char *ptr, *cmd;
1.11      lukem     586:        static char *from = NULL, *to = NULL;
1.40      christos  587:        int start, end, idx, has_mods = 0;
                    588:        int p_on = 0, g_on = 0;
1.1       christos  589:
                    590:        *result = NULL;
1.40      christos  591:        aptr = NULL;
1.41      christos  592:        ptr = NULL;
1.1       christos  593:
1.40      christos  594:        /* First get event specifier */
                    595:        idx = 0;
1.1       christos  596:
1.40      christos  597:        if (strchr(":^*$", command[offs + 1])) {
                    598:                char str[4];
                    599:                /*
                    600:                * "!:" is shorthand for "!!:".
                    601:                * "!^", "!*" and "!$" are shorthand for
                    602:                * "!!:^", "!!:*" and "!!:$" respectively.
                    603:                */
                    604:                str[0] = str[1] = '!';
                    605:                str[2] = '0';
                    606:                ptr = get_history_event(str, &idx, 0);
                    607:                idx = (command[offs + 1] == ':')? 1:0;
                    608:                has_mods = 1;
1.1       christos  609:        } else {
1.40      christos  610:                if (command[offs + 1] == '#') {
                    611:                        /* use command so far */
                    612:                        if ((aptr = malloc(offs + 1)) == NULL)
                    613:                                return -1;
                    614:                        (void)strncpy(aptr, command, offs);
                    615:                        aptr[offs] = '\0';
                    616:                        idx = 1;
1.1       christos  617:                } else {
1.40      christos  618:                        int     qchar;
                    619:
                    620:                        qchar = (offs > 0 && command[offs - 1] == '"')? '"':0;
                    621:                        ptr = get_history_event(command + offs, &idx, qchar);
                    622:                }
                    623:                has_mods = command[offs + idx] == ':';
                    624:        }
1.1       christos  625:
1.40      christos  626:        if (ptr == NULL && aptr == NULL)
                    627:                return(-1);
1.1       christos  628:
1.40      christos  629:        if (!has_mods) {
                    630:                *result = strdup(aptr? aptr : ptr);
                    631:                if (aptr)
                    632:                        free(aptr);
                    633:                return(1);
                    634:        }
                    635:
                    636:        cmd = command + offs + idx + 1;
                    637:
                    638:        /* Now parse any word designators */
                    639:
                    640:        if (*cmd == '%')        /* last word matched by ?pat? */
                    641:                tmp = strdup(last_search_match? last_search_match:"");
                    642:        else if (strchr("^*$-0123456789", *cmd)) {
                    643:                start = end = -1;
                    644:                if (*cmd == '^')
                    645:                        start = end = 1, cmd++;
                    646:                else if (*cmd == '$')
                    647:                        start = -1, cmd++;
                    648:                else if (*cmd == '*')
                    649:                        start = 1, cmd++;
                    650:               else if (*cmd == '-' || isdigit((unsigned char) *cmd)) {
                    651:                        start = 0;
                    652:                        while (*cmd && '0' <= *cmd && *cmd <= '9')
                    653:                                start = start * 10 + *cmd++ - '0';
                    654:
                    655:                        if (*cmd == '-') {
                    656:                                if (isdigit((unsigned char) cmd[1])) {
                    657:                                        cmd++;
                    658:                                        end = 0;
                    659:                                        while (*cmd && '0' <= *cmd && *cmd <= '9')
                    660:                                                end = end * 10 + *cmd++ - '0';
                    661:                                } else if (cmd[1] == '$') {
                    662:                                        cmd += 2;
                    663:                                        end = -1;
                    664:                                } else {
                    665:                                        cmd++;
                    666:                                        end = -2;
                    667:                                }
                    668:                        } else if (*cmd == '*')
                    669:                                end = -1, cmd++;
1.1       christos  670:                        else
1.40      christos  671:                                end = start;
                    672:                }
                    673:                tmp = history_arg_extract(start, end, aptr? aptr:ptr);
                    674:                if (tmp == NULL) {
                    675:                        (void)fprintf(rl_outstream, "%s: Bad word specifier",
                    676:                            command + offs + idx);
                    677:                        if (aptr)
                    678:                                free(aptr);
                    679:                        return(-1);
                    680:                }
                    681:        } else
                    682:                tmp = strdup(aptr? aptr:ptr);
1.1       christos  683:
1.40      christos  684:        if (aptr)
                    685:                free(aptr);
1.1       christos  686:
1.40      christos  687:        if (*cmd == 0 || (cmd - (command + offs) >= cmdlen)) {
                    688:                *result = tmp;
                    689:                return(1);
1.1       christos  690:        }
                    691:
                    692:        for (; *cmd; cmd++) {
                    693:                if (*cmd == ':')
                    694:                        continue;
1.40      christos  695:                else if (*cmd == 'h') {         /* remove trailing path */
                    696:                        if ((aptr = strrchr(tmp, '/')) != NULL)
                    697:                                *aptr = 0;
                    698:                } else if (*cmd == 't') {       /* remove leading path */
                    699:                        if ((aptr = strrchr(tmp, '/')) != NULL) {
                    700:                                aptr = strdup(aptr + 1);
                    701:                                free(tmp);
                    702:                                tmp = aptr;
                    703:                        }
                    704:                } else if (*cmd == 'r') {       /* remove trailing suffix */
                    705:                        if ((aptr = strrchr(tmp, '.')) != NULL)
                    706:                                *aptr = 0;
                    707:                } else if (*cmd == 'e') {       /* remove all but suffix */
                    708:                        if ((aptr = strrchr(tmp, '.')) != NULL) {
                    709:                                aptr = strdup(aptr);
                    710:                                free(tmp);
                    711:                                tmp = aptr;
                    712:                        }
                    713:                } else if (*cmd == 'p')         /* print only */
                    714:                        p_on = 1;
1.1       christos  715:                else if (*cmd == 'g')
                    716:                        g_on = 2;
                    717:                else if (*cmd == 's' || *cmd == '&') {
1.11      lukem     718:                        char *what, *with, delim;
1.30      christos  719:                        size_t len, from_len;
1.5       christos  720:                        size_t size;
1.1       christos  721:
                    722:                        if (*cmd == '&' && (from == NULL || to == NULL))
                    723:                                continue;
                    724:                        else if (*cmd == 's') {
                    725:                                delim = *(++cmd), cmd++;
                    726:                                size = 16;
1.5       christos  727:                                what = realloc(from, size);
1.23      christos  728:                                if (what == NULL) {
                    729:                                        free(from);
1.28      christos  730:                                        return 0;
1.23      christos  731:                                }
1.1       christos  732:                                len = 0;
                    733:                                for (; *cmd && *cmd != delim; cmd++) {
1.40      christos  734:                                        if (*cmd == '\\' && cmd[1] == delim)
1.1       christos  735:                                                cmd++;
1.23      christos  736:                                        if (len >= size) {
                    737:                                                char *nwhat;
                    738:                                                nwhat = realloc(what,
1.40      christos  739:                                                                (size <<= 1));
1.23      christos  740:                                                if (nwhat == NULL) {
                    741:                                                        free(what);
1.28      christos  742:                                                        return 0;
1.23      christos  743:                                                }
                    744:                                                what = nwhat;
                    745:                                        }
1.1       christos  746:                                        what[len++] = *cmd;
                    747:                                }
                    748:                                what[len] = '\0';
                    749:                                from = what;
                    750:                                if (*what == '\0') {
                    751:                                        free(what);
1.23      christos  752:                                        if (search) {
1.1       christos  753:                                                from = strdup(search);
1.23      christos  754:                                                if (from == NULL)
1.28      christos  755:                                                        return 0;
1.23      christos  756:                                        } else {
1.1       christos  757:                                                from = NULL;
1.11      lukem     758:                                                return (-1);
1.1       christos  759:                                        }
                    760:                                }
                    761:                                cmd++;  /* shift after delim */
                    762:                                if (!*cmd)
                    763:                                        continue;
                    764:
                    765:                                size = 16;
1.5       christos  766:                                with = realloc(to, size);
1.23      christos  767:                                if (with == NULL) {
                    768:                                        free(to);
                    769:                                        return -1;
                    770:                                }
1.1       christos  771:                                len = 0;
                    772:                                from_len = strlen(from);
                    773:                                for (; *cmd && *cmd != delim; cmd++) {
                    774:                                        if (len + from_len + 1 >= size) {
1.23      christos  775:                                                char *nwith;
1.1       christos  776:                                                size += from_len + 1;
1.23      christos  777:                                                nwith = realloc(with, size);
                    778:                                                if (nwith == NULL) {
                    779:                                                        free(with);
                    780:                                                        return -1;
                    781:                                                }
                    782:                                                with = nwith;
1.1       christos  783:                                        }
                    784:                                        if (*cmd == '&') {
                    785:                                                /* safe */
1.40      christos  786:                                                (void)strcpy(&with[len], from);
1.1       christos  787:                                                len += from_len;
                    788:                                                continue;
                    789:                                        }
                    790:                                        if (*cmd == '\\'
                    791:                                            && (*(cmd + 1) == delim
                    792:                                                || *(cmd + 1) == '&'))
                    793:                                                cmd++;
                    794:                                        with[len++] = *cmd;
                    795:                                }
                    796:                                with[len] = '\0';
                    797:                                to = with;
                    798:                        }
                    799:
1.40      christos  800:                        aptr = _rl_compat_sub(tmp, from, to, g_on);
                    801:                        if (aptr) {
                    802:                                free(tmp);
                    803:                                tmp = aptr;
1.23      christos  804:                        }
1.40      christos  805:                        g_on = 0;
1.1       christos  806:                }
1.5       christos  807:        }
1.40      christos  808:        *result = tmp;
                    809:        return (p_on? 2:1);
1.1       christos  810: }
                    811:
1.11      lukem     812:
1.1       christos  813: /*
                    814:  * csh-style history expansion
                    815:  */
                    816: int
1.11      lukem     817: history_expand(char *str, char **output)
                    818: {
1.40      christos  819:        int ret = 0;
                    820:        size_t idx, i, size;
                    821:        char *tmp, *result;
1.1       christos  822:
                    823:        if (h == NULL || e == NULL)
                    824:                rl_initialize();
                    825:
1.40      christos  826:        if (history_expansion_char == 0) {
                    827:                *output = strdup(str);
                    828:                return(0);
                    829:        }
1.1       christos  830:
1.40      christos  831:        *output = NULL;
1.1       christos  832:        if (str[0] == history_subst_char) {
                    833:                /* ^foo^foo2^ is equivalent to !!:s^foo^foo2^ */
1.40      christos  834:                *output = malloc(strlen(str) + 4 + 1);
                    835:                if (*output == NULL)
                    836:                        return 0;
                    837:                (*output)[0] = (*output)[1] = history_expansion_char;
                    838:                (*output)[2] = ':';
                    839:                (*output)[3] = 's';
                    840:                (void)strcpy((*output) + 4, str);
                    841:                str = *output;
                    842:        } else {
                    843:                *output = strdup(str);
                    844:                if (*output == NULL)
                    845:                        return 0;
1.1       christos  846:        }
1.40      christos  847:
                    848: #define ADD_STRING(what, len)                                          \
1.1       christos  849:        {                                                               \
1.23      christos  850:                if (idx + len + 1 > size) {                             \
                    851:                        char *nresult = realloc(result, (size += len + 1));\
                    852:                        if (nresult == NULL) {                          \
                    853:                                free(*output);                          \
1.28      christos  854:                                return 0;                               \
1.23      christos  855:                        }                                               \
                    856:                        result = nresult;                               \
                    857:                }                                                       \
1.1       christos  858:                (void)strncpy(&result[idx], what, len);                 \
                    859:                idx += len;                                             \
                    860:                result[idx] = '\0';                                     \
                    861:        }
                    862:
                    863:        result = NULL;
                    864:        size = idx = 0;
                    865:        for (i = 0; str[i];) {
1.40      christos  866:                int qchar, loop_again;
                    867:                size_t len, start, j;
1.1       christos  868:
1.40      christos  869:                qchar = 0;
1.1       christos  870:                loop_again = 1;
                    871:                start = j = i;
                    872: loop:
                    873:                for (; str[j]; j++) {
                    874:                        if (str[j] == '\\' &&
                    875:                            str[j + 1] == history_expansion_char) {
1.40      christos  876:                                (void)strcpy(&str[j], &str[j + 1]);
1.1       christos  877:                                continue;
                    878:                        }
                    879:                        if (!loop_again) {
1.40      christos  880:                                if (isspace((unsigned char) str[j])
                    881:                                    || str[j] == qchar)
1.1       christos  882:                                        break;
                    883:                        }
                    884:                        if (str[j] == history_expansion_char
                    885:                            && !strchr(history_no_expand_chars, str[j + 1])
                    886:                            && (!history_inhibit_expansion_function ||
1.40      christos  887:                            (*history_inhibit_expansion_function)(str,
                    888:                            (int)j) == 0))
1.1       christos  889:                                break;
                    890:                }
                    891:
1.40      christos  892:                if (str[j] && loop_again) {
1.1       christos  893:                        i = j;
1.40      christos  894:                        qchar = (j > 0 && str[j - 1] == '"' )? '"':0;
1.1       christos  895:                        j++;
                    896:                        if (str[j] == history_expansion_char)
                    897:                                j++;
                    898:                        loop_again = 0;
                    899:                        goto loop;
                    900:                }
                    901:                len = i - start;
1.40      christos  902:                tmp = &str[start];
                    903:                ADD_STRING(tmp, len);
1.1       christos  904:
1.40      christos  905:                if (str[i] == '\0' || str[i] != history_expansion_char) {
1.1       christos  906:                        len = j - i;
1.40      christos  907:                        tmp = &str[i];
                    908:                        ADD_STRING(tmp, len);
1.1       christos  909:                        if (start == 0)
1.40      christos  910:                                ret = 0;
1.1       christos  911:                        else
1.40      christos  912:                                ret = 1;
1.1       christos  913:                        break;
                    914:                }
1.40      christos  915:                ret = _history_expand_command (str, i, (j - i), &tmp);
                    916:                if (ret > 0 && tmp) {
                    917:                        len = strlen(tmp);
                    918:                        ADD_STRING(tmp, len);
                    919:                        free(tmp);
1.1       christos  920:                }
                    921:                i = j;
1.40      christos  922:        }
1.1       christos  923:
1.40      christos  924:        /* ret is 2 for "print only" option */
                    925:        if (ret == 2) {
                    926:                add_history(result);
1.1       christos  927: #ifdef GDB_411_HACK
                    928:                /* gdb 4.11 has been shipped with readline, where */
                    929:                /* history_expand() returned -1 when the line     */
                    930:                /* should not be executed; in readline 2.1+       */
                    931:                /* it should return 2 in such a case              */
1.40      christos  932:                ret = -1;
1.1       christos  933: #endif
                    934:        }
                    935:        free(*output);
                    936:        *output = result;
                    937:
1.40      christos  938:        return (ret);
1.1       christos  939: }
                    940:
1.40      christos  941: /*
                    942: * Return a string consisting of arguments of "str" from "start" to "end".
                    943: */
                    944: char *
                    945: history_arg_extract(int start, int end, const char *str)
                    946: {
                    947:        size_t  i, len, max;
                    948:        char    **arr, *result;
                    949:
                    950:        arr = history_tokenize(str);
                    951:        if (!arr)
                    952:                return(NULL);
                    953:        if (arr && *arr == NULL) {
                    954:                free(arr);
                    955:                return(NULL);
                    956:        }
                    957:
                    958:        for (max = 0; arr[max]; max++)
                    959:                continue;
                    960:        max--;
                    961:
                    962:        if (start == '$')
                    963:                start = max;
                    964:        if (end == '$')
                    965:                end = max;
                    966:        if (end < 0)
                    967:                end = max + end + 1;
                    968:        if (start < 0)
                    969:                start = end;
                    970:
                    971:        if (start < 0 || end < 0 || start > max || end > max || start > end)
                    972:                return(NULL);
                    973:
                    974:        for (i = start, len = 0; i <= end; i++)
                    975:                len += strlen(arr[i]) + 1;
                    976:        len++;
                    977:        result = malloc(len);
                    978:        if (result == NULL)
                    979:                return NULL;
                    980:
                    981:        for (i = start, len = 0; i <= end; i++) {
                    982:                (void)strcpy(result + len, arr[i]);
                    983:                len += strlen(arr[i]);
                    984:                if (i < end)
                    985:                        result[len++] = ' ';
                    986:        }
                    987:        result[len] = 0;
                    988:
                    989:        for (i = 0; arr[i]; i++)
                    990:                free(arr[i]);
                    991:        free(arr);
                    992:
                    993:        return(result);
                    994: }
1.11      lukem     995:
1.1       christos  996: /*
1.40      christos  997:  * Parse the string into individual tokens,
                    998:  * similar to how shell would do it.
1.1       christos  999:  */
                   1000: char **
1.11      lukem    1001: history_tokenize(const char *str)
1.1       christos 1002: {
1.40      christos 1003:        int size = 1, idx = 0, i, start;
1.5       christos 1004:        size_t len;
1.1       christos 1005:        char **result = NULL, *temp, delim = '\0';
                   1006:
1.40      christos 1007:        for (i = 0; str[i];) {
1.4       christos 1008:                while (isspace((unsigned char) str[i]))
1.1       christos 1009:                        i++;
                   1010:                start = i;
1.40      christos 1011:                for (; str[i];) {
1.9       jdolecek 1012:                        if (str[i] == '\\') {
1.14      jdolecek 1013:                                if (str[i+1] != '\0')
1.9       jdolecek 1014:                                        i++;
                   1015:                        } else if (str[i] == delim)
1.1       christos 1016:                                delim = '\0';
                   1017:                        else if (!delim &&
1.11      lukem    1018:                                    (isspace((unsigned char) str[i]) ||
                   1019:                                strchr("()<>;&|$", str[i])))
1.1       christos 1020:                                break;
                   1021:                        else if (!delim && strchr("'`\"", str[i]))
                   1022:                                delim = str[i];
1.40      christos 1023:                        if (str[i])
                   1024:                                i++;
1.1       christos 1025:                }
                   1026:
1.40      christos 1027:                if (idx + 2 >= size) {
1.23      christos 1028:                        char **nresult;
1.1       christos 1029:                        size <<= 1;
1.23      christos 1030:                        nresult = realloc(result, size * sizeof(char *));
                   1031:                        if (nresult == NULL) {
                   1032:                                free(result);
                   1033:                                return NULL;
                   1034:                        }
                   1035:                        result = nresult;
1.1       christos 1036:                }
                   1037:                len = i - start;
                   1038:                temp = malloc(len + 1);
1.23      christos 1039:                if (temp == NULL) {
1.40      christos 1040:                        for (i = 0; i < idx; i++)
                   1041:                                free(result[i]);
1.23      christos 1042:                        free(result);
                   1043:                        return NULL;
                   1044:                }
1.40      christos 1045:                (void)strncpy(temp, &str[start], len);
1.1       christos 1046:                temp[len] = '\0';
1.40      christos 1047:                result[idx++] = temp;
                   1048:                result[idx] = NULL;
                   1049:                if (str[i])
                   1050:                        i++;
1.1       christos 1051:        }
1.11      lukem    1052:        return (result);
1.1       christos 1053: }
                   1054:
1.11      lukem    1055:
1.1       christos 1056: /*
                   1057:  * limit size of history record to ``max'' events
                   1058:  */
                   1059: void
1.11      lukem    1060: stifle_history(int max)
1.1       christos 1061: {
                   1062:        HistEvent ev;
                   1063:
                   1064:        if (h == NULL || e == NULL)
                   1065:                rl_initialize();
                   1066:
1.4       christos 1067:        if (history(h, &ev, H_SETSIZE, max) == 0)
1.1       christos 1068:                max_input_history = max;
                   1069: }
                   1070:
1.11      lukem    1071:
1.1       christos 1072: /*
                   1073:  * "unlimit" size of history - set the limit to maximum allowed int value
                   1074:  */
                   1075: int
1.11      lukem    1076: unstifle_history(void)
1.1       christos 1077: {
                   1078:        HistEvent ev;
                   1079:        int omax;
                   1080:
1.4       christos 1081:        history(h, &ev, H_SETSIZE, INT_MAX);
1.1       christos 1082:        omax = max_input_history;
                   1083:        max_input_history = INT_MAX;
1.11      lukem    1084:        return (omax);          /* some value _must_ be returned */
1.1       christos 1085: }
                   1086:
1.11      lukem    1087:
1.1       christos 1088: int
1.11      lukem    1089: history_is_stifled(void)
1.1       christos 1090: {
1.11      lukem    1091:
1.1       christos 1092:        /* cannot return true answer */
                   1093:        return (max_input_history != INT_MAX);
                   1094: }
                   1095:
1.11      lukem    1096:
1.1       christos 1097: /*
                   1098:  * read history from a file given
                   1099:  */
                   1100: int
1.11      lukem    1101: read_history(const char *filename)
1.1       christos 1102: {
                   1103:        HistEvent ev;
                   1104:
                   1105:        if (h == NULL || e == NULL)
                   1106:                rl_initialize();
1.11      lukem    1107:        return (history(h, &ev, H_LOAD, filename));
1.1       christos 1108: }
                   1109:
1.11      lukem    1110:
1.1       christos 1111: /*
                   1112:  * write history to a file given
                   1113:  */
                   1114: int
1.11      lukem    1115: write_history(const char *filename)
1.1       christos 1116: {
                   1117:        HistEvent ev;
                   1118:
                   1119:        if (h == NULL || e == NULL)
                   1120:                rl_initialize();
1.11      lukem    1121:        return (history(h, &ev, H_SAVE, filename));
1.1       christos 1122: }
                   1123:
1.11      lukem    1124:
1.1       christos 1125: /*
                   1126:  * returns history ``num''th event
                   1127:  *
                   1128:  * returned pointer points to static variable
                   1129:  */
1.2       christos 1130: HIST_ENTRY *
1.11      lukem    1131: history_get(int num)
1.1       christos 1132: {
                   1133:        static HIST_ENTRY she;
                   1134:        HistEvent ev;
1.40      christos 1135:        int curr_num;
1.1       christos 1136:
                   1137:        if (h == NULL || e == NULL)
                   1138:                rl_initialize();
                   1139:
1.40      christos 1140:        /* save current position */
1.1       christos 1141:        if (history(h, &ev, H_CURR) != 0)
1.11      lukem    1142:                return (NULL);
1.1       christos 1143:        curr_num = ev.num;
1.40      christos 1144:
                   1145:        /* start from most recent */
                   1146:        if (history(h, &ev, H_FIRST) != 0)
1.11      lukem    1147:                return (NULL);  /* error */
1.40      christos 1148:
                   1149:        /* look backwards for event matching specified offset */
                   1150:        if (history(h, &ev, H_NEXT_EVENT, num))
                   1151:                return (NULL);
1.1       christos 1152:
                   1153:        she.line = ev.str;
                   1154:        she.data = NULL;
                   1155:
1.40      christos 1156:        /* restore pointer to where it was */
                   1157:        (void)history(h, &ev, H_SET, curr_num);
1.1       christos 1158:
1.11      lukem    1159:        return (&she);
1.1       christos 1160: }
                   1161:
1.11      lukem    1162:
1.1       christos 1163: /*
                   1164:  * add the line to history table
                   1165:  */
                   1166: int
1.11      lukem    1167: add_history(const char *line)
1.1       christos 1168: {
                   1169:        HistEvent ev;
                   1170:
                   1171:        if (h == NULL || e == NULL)
                   1172:                rl_initialize();
                   1173:
1.40      christos 1174:        (void)history(h, &ev, H_ENTER, line);
1.1       christos 1175:        if (history(h, &ev, H_GETSIZE) == 0)
                   1176:                history_length = ev.num;
                   1177:
1.40      christos 1178:        return (!(history_length > 0)); /* return 0 if all is okay */
1.1       christos 1179: }
                   1180:
1.11      lukem    1181:
1.1       christos 1182: /*
1.58      christos 1183:  * remove the specified entry from the history list and return it.
                   1184:  */
                   1185: HIST_ENTRY *
                   1186: remove_history(int num)
                   1187: {
                   1188:        static HIST_ENTRY she;
                   1189:        HistEvent ev;
                   1190:
                   1191:        if (h == NULL || e == NULL)
                   1192:                rl_initialize();
                   1193:
                   1194:        if (history(h, &ev, H_DEL, num) != 0)
                   1195:                return NULL;
                   1196:
                   1197:        she.line = ev.str;
                   1198:        she.data = NULL;
                   1199:
                   1200:        return &she;
                   1201: }
                   1202:
                   1203:
                   1204: /*
1.1       christos 1205:  * clear the history list - delete all entries
                   1206:  */
                   1207: void
1.11      lukem    1208: clear_history(void)
1.1       christos 1209: {
                   1210:        HistEvent ev;
1.11      lukem    1211:
1.1       christos 1212:        history(h, &ev, H_CLEAR);
                   1213: }
                   1214:
1.11      lukem    1215:
1.1       christos 1216: /*
                   1217:  * returns offset of the current history event
                   1218:  */
                   1219: int
1.11      lukem    1220: where_history(void)
1.1       christos 1221: {
                   1222:        HistEvent ev;
                   1223:        int curr_num, off;
                   1224:
                   1225:        if (history(h, &ev, H_CURR) != 0)
1.11      lukem    1226:                return (0);
1.1       christos 1227:        curr_num = ev.num;
                   1228:
                   1229:        history(h, &ev, H_FIRST);
                   1230:        off = 1;
                   1231:        while (ev.num != curr_num && history(h, &ev, H_NEXT) == 0)
                   1232:                off++;
                   1233:
1.11      lukem    1234:        return (off);
1.1       christos 1235: }
                   1236:
1.11      lukem    1237:
1.1       christos 1238: /*
                   1239:  * returns current history event or NULL if there is no such event
                   1240:  */
1.2       christos 1241: HIST_ENTRY *
1.11      lukem    1242: current_history(void)
1.1       christos 1243: {
1.11      lukem    1244:
                   1245:        return (_move_history(H_CURR));
1.1       christos 1246: }
                   1247:
1.11      lukem    1248:
1.1       christos 1249: /*
                   1250:  * returns total number of bytes history events' data are using
                   1251:  */
                   1252: int
1.11      lukem    1253: history_total_bytes(void)
1.1       christos 1254: {
                   1255:        HistEvent ev;
                   1256:        int curr_num, size;
                   1257:
                   1258:        if (history(h, &ev, H_CURR) != 0)
1.11      lukem    1259:                return (-1);
1.1       christos 1260:        curr_num = ev.num;
                   1261:
                   1262:        history(h, &ev, H_FIRST);
                   1263:        size = 0;
                   1264:        do
                   1265:                size += strlen(ev.str);
                   1266:        while (history(h, &ev, H_NEXT) == 0);
                   1267:
                   1268:        /* get to the same position as before */
                   1269:        history(h, &ev, H_PREV_EVENT, curr_num);
                   1270:
1.11      lukem    1271:        return (size);
1.1       christos 1272: }
                   1273:
1.11      lukem    1274:
1.1       christos 1275: /*
                   1276:  * sets the position in the history list to ``pos''
                   1277:  */
                   1278: int
1.11      lukem    1279: history_set_pos(int pos)
1.1       christos 1280: {
                   1281:        HistEvent ev;
1.40      christos 1282:        int curr_num;
1.1       christos 1283:
                   1284:        if (pos > history_length || pos < 0)
1.11      lukem    1285:                return (-1);
1.1       christos 1286:
                   1287:        history(h, &ev, H_CURR);
                   1288:        curr_num = ev.num;
                   1289:
1.40      christos 1290:        if (history(h, &ev, H_SET, pos)) {
                   1291:                history(h, &ev, H_SET, curr_num);
                   1292:                return(-1);
1.1       christos 1293:        }
1.11      lukem    1294:        return (0);
1.1       christos 1295: }
                   1296:
1.11      lukem    1297:
1.1       christos 1298: /*
                   1299:  * returns previous event in history and shifts pointer accordingly
                   1300:  */
1.2       christos 1301: HIST_ENTRY *
1.11      lukem    1302: previous_history(void)
1.1       christos 1303: {
1.11      lukem    1304:
                   1305:        return (_move_history(H_PREV));
1.1       christos 1306: }
                   1307:
1.11      lukem    1308:
1.1       christos 1309: /*
                   1310:  * returns next event in history and shifts pointer accordingly
                   1311:  */
1.2       christos 1312: HIST_ENTRY *
1.11      lukem    1313: next_history(void)
1.1       christos 1314: {
1.11      lukem    1315:
                   1316:        return (_move_history(H_NEXT));
1.1       christos 1317: }
                   1318:
1.11      lukem    1319:
1.1       christos 1320: /*
1.40      christos 1321:  * searches for first history event containing the str
1.1       christos 1322:  */
1.40      christos 1323: int
                   1324: history_search(const char *str, int direction)
1.11      lukem    1325: {
                   1326:        HistEvent ev;
                   1327:        const char *strp;
                   1328:        int curr_num;
1.1       christos 1329:
                   1330:        if (history(h, &ev, H_CURR) != 0)
1.11      lukem    1331:                return (-1);
1.1       christos 1332:        curr_num = ev.num;
                   1333:
                   1334:        for (;;) {
1.40      christos 1335:                if ((strp = strstr(ev.str, str)) != NULL)
1.1       christos 1336:                        return (int) (strp - ev.str);
1.40      christos 1337:                if (history(h, &ev, direction < 0 ? H_NEXT:H_PREV) != 0)
1.1       christos 1338:                        break;
                   1339:        }
1.40      christos 1340:        history(h, &ev, H_SET, curr_num);
1.11      lukem    1341:        return (-1);
1.1       christos 1342: }
                   1343:
1.11      lukem    1344:
1.1       christos 1345: /*
                   1346:  * searches for first history event beginning with str
                   1347:  */
                   1348: int
1.11      lukem    1349: history_search_prefix(const char *str, int direction)
1.1       christos 1350: {
1.40      christos 1351:        HistEvent ev;
1.11      lukem    1352:
1.40      christos 1353:        return (history(h, &ev, direction < 0? H_PREV_STR:H_NEXT_STR, str));
1.1       christos 1354: }
                   1355:
1.11      lukem    1356:
1.1       christos 1357: /*
                   1358:  * search for event in history containing str, starting at offset
                   1359:  * abs(pos); continue backward, if pos<0, forward otherwise
                   1360:  */
1.5       christos 1361: /* ARGSUSED */
1.1       christos 1362: int
1.40      christos 1363: history_search_pos(const char *str,
1.30      christos 1364:                   int direction __attribute__((__unused__)), int pos)
1.1       christos 1365: {
1.11      lukem    1366:        HistEvent ev;
                   1367:        int curr_num, off;
1.1       christos 1368:
                   1369:        off = (pos > 0) ? pos : -pos;
                   1370:        pos = (pos > 0) ? 1 : -1;
                   1371:
                   1372:        if (history(h, &ev, H_CURR) != 0)
1.11      lukem    1373:                return (-1);
1.1       christos 1374:        curr_num = ev.num;
                   1375:
                   1376:        if (history_set_pos(off) != 0 || history(h, &ev, H_CURR) != 0)
1.11      lukem    1377:                return (-1);
1.1       christos 1378:
                   1379:
                   1380:        for (;;) {
                   1381:                if (strstr(ev.str, str))
1.11      lukem    1382:                        return (off);
1.1       christos 1383:                if (history(h, &ev, (pos < 0) ? H_PREV : H_NEXT) != 0)
                   1384:                        break;
                   1385:        }
                   1386:
                   1387:        /* set "current" pointer back to previous state */
                   1388:        history(h, &ev, (pos < 0) ? H_NEXT_EVENT : H_PREV_EVENT, curr_num);
                   1389:
1.11      lukem    1390:        return (-1);
1.1       christos 1391: }
                   1392:
                   1393:
                   1394: /********************************/
1.40      christos 1395: /* completion functions */
1.1       christos 1396:
1.57      christos 1397: char *
                   1398: tilde_expand(char *name)
                   1399: {
                   1400:        return fn_tilde_expand(name);
                   1401: }
                   1402:
                   1403: char *
                   1404: filename_completion_function(const char *name, int state)
                   1405: {
                   1406:        return fn_filename_completion_function(name, state);
                   1407: }
                   1408:
1.1       christos 1409: /*
                   1410:  * a completion generator for usernames; returns _first_ username
                   1411:  * which starts with supplied text
                   1412:  * text contains a partial username preceded by random character
                   1413:  * (usually '~'); state is ignored
                   1414:  * it's callers responsibility to free returned value
                   1415:  */
1.11      lukem    1416: char *
                   1417: username_completion_function(const char *text, int state)
1.1       christos 1418: {
1.50      christos 1419:        struct passwd *pwd, pwres;
                   1420:        char pwbuf[1024];
1.1       christos 1421:
                   1422:        if (text[0] == '\0')
1.11      lukem    1423:                return (NULL);
1.1       christos 1424:
                   1425:        if (*text == '~')
                   1426:                text++;
                   1427:
                   1428:        if (state == 0)
                   1429:                setpwent();
                   1430:
1.50      christos 1431:        while (getpwent_r(&pwres, pwbuf, sizeof(pwbuf), &pwd) == 0
1.52      christos 1432:            && pwd != NULL && text[0] == pwd->pw_name[0]
1.11      lukem    1433:            && strcmp(text, pwd->pw_name) == 0);
1.1       christos 1434:
                   1435:        if (pwd == NULL) {
                   1436:                endpwent();
1.11      lukem    1437:                return (NULL);
1.1       christos 1438:        }
1.11      lukem    1439:        return (strdup(pwd->pw_name));
1.1       christos 1440: }
                   1441:
1.11      lukem    1442:
1.1       christos 1443: /*
1.46      christos 1444:  * el-compatible wrapper to send TSTP on ^Z
                   1445:  */
                   1446: /* ARGSUSED */
                   1447: static unsigned char
                   1448: _el_rl_tstp(EditLine *el __attribute__((__unused__)), int ch __attribute__((__unused__)))
                   1449: {
                   1450:        (void)kill(0, SIGTSTP);
                   1451:        return CC_NORM;
                   1452: }
1.11      lukem    1453:
1.1       christos 1454: /*
1.12      jdolecek 1455:  * Display list of strings in columnar format on readline's output stream.
                   1456:  * 'matches' is list of strings, 'len' is number of strings in 'matches',
                   1457:  * 'max' is maximum length of string in 'matches'.
                   1458:  */
                   1459: void
1.53      dsl      1460: rl_display_match_list(char **matches, int len, int max)
1.12      jdolecek 1461: {
                   1462:
1.53      dsl      1463:        fn_display_match_list(e, matches, len, max);
1.1       christos 1464: }
                   1465:
1.56      christos 1466: static const char *
                   1467: /*ARGSUSED*/
                   1468: _rl_completion_append_character_function(const char *dummy
                   1469:     __attribute__((__unused__)))
                   1470: {
                   1471:        static char buf[2];
                   1472:        buf[1] = rl_completion_append_character;
                   1473:        return buf;
                   1474: }
                   1475:
1.11      lukem    1476:
1.1       christos 1477: /*
                   1478:  * complete word at current point
                   1479:  */
1.53      dsl      1480: /* ARGSUSED */
1.1       christos 1481: int
1.53      dsl      1482: rl_complete(int ignore __attribute__((__unused__)), int invoking_key)
1.1       christos 1483: {
                   1484:        if (h == NULL || e == NULL)
                   1485:                rl_initialize();
                   1486:
                   1487:        if (rl_inhibit_completion) {
1.47      christos 1488:                char arr[2];
                   1489:                arr[0] = (char)invoking_key;
                   1490:                arr[1] = '\0';
                   1491:                el_insertstr(e, arr);
1.11      lukem    1492:                return (CC_REFRESH);
1.53      dsl      1493:        }
                   1494:
                   1495:        /* Just look at how many global variables modify this operation! */
                   1496:        return fn_complete(e,
                   1497:            (CPFunction *)rl_completion_entry_function,
                   1498:            rl_attempted_completion_function,
                   1499:            rl_basic_word_break_characters, rl_special_prefixes,
1.56      christos 1500:            _rl_completion_append_character_function, rl_completion_query_items,
1.53      dsl      1501:            &rl_completion_type, &rl_attempted_completion_over,
                   1502:            &rl_point, &rl_end);
1.1       christos 1503: }
                   1504:
1.11      lukem    1505:
1.53      dsl      1506: /* ARGSUSED */
                   1507: static unsigned char
                   1508: _el_rl_complete(EditLine *el __attribute__((__unused__)), int ch)
                   1509: {
                   1510:        return (unsigned char)rl_complete(0, ch);
                   1511: }
                   1512:
1.1       christos 1513: /*
1.7       simonb   1514:  * misc other functions
1.1       christos 1515:  */
                   1516:
                   1517: /*
                   1518:  * bind key c to readline-type function func
                   1519:  */
                   1520: int
1.11      lukem    1521: rl_bind_key(int c, int func(int, int))
1.1       christos 1522: {
1.11      lukem    1523:        int retval = -1;
1.1       christos 1524:
                   1525:        if (h == NULL || e == NULL)
                   1526:                rl_initialize();
                   1527:
                   1528:        if (func == rl_insert) {
                   1529:                /* XXX notice there is no range checking of ``c'' */
                   1530:                e->el_map.key[c] = ED_INSERT;
                   1531:                retval = 0;
                   1532:        }
1.11      lukem    1533:        return (retval);
1.1       christos 1534: }
                   1535:
1.11      lukem    1536:
1.1       christos 1537: /*
                   1538:  * read one key from input - handles chars pushed back
                   1539:  * to input stream also
                   1540:  */
                   1541: int
1.11      lukem    1542: rl_read_key(void)
1.1       christos 1543: {
1.11      lukem    1544:        char fooarr[2 * sizeof(int)];
1.1       christos 1545:
                   1546:        if (e == NULL || h == NULL)
                   1547:                rl_initialize();
                   1548:
1.11      lukem    1549:        return (el_getc(e, fooarr));
1.1       christos 1550: }
                   1551:
1.11      lukem    1552:
1.1       christos 1553: /*
                   1554:  * reset the terminal
                   1555:  */
1.5       christos 1556: /* ARGSUSED */
1.1       christos 1557: void
1.30      christos 1558: rl_reset_terminal(const char *p __attribute__((__unused__)))
1.1       christos 1559: {
1.11      lukem    1560:
1.1       christos 1561:        if (h == NULL || e == NULL)
                   1562:                rl_initialize();
                   1563:        el_reset(e);
                   1564: }
                   1565:
1.11      lukem    1566:
1.1       christos 1567: /*
                   1568:  * insert character ``c'' back into input stream, ``count'' times
                   1569:  */
                   1570: int
1.11      lukem    1571: rl_insert(int count, int c)
1.1       christos 1572: {
1.11      lukem    1573:        char arr[2];
1.1       christos 1574:
                   1575:        if (h == NULL || e == NULL)
                   1576:                rl_initialize();
                   1577:
                   1578:        /* XXX - int -> char conversion can lose on multichars */
                   1579:        arr[0] = c;
                   1580:        arr[1] = '\0';
                   1581:
                   1582:        for (; count > 0; count--)
                   1583:                el_push(e, arr);
                   1584:
1.11      lukem    1585:        return (0);
1.35      christos 1586: }
                   1587:
                   1588: /*ARGSUSED*/
                   1589: int
                   1590: rl_newline(int count, int c)
                   1591: {
                   1592:        /*
                   1593:         * Readline-4.0 appears to ignore the args.
                   1594:         */
                   1595:        return rl_insert(1, '\n');
                   1596: }
                   1597:
                   1598: /*ARGSUSED*/
                   1599: static unsigned char
                   1600: rl_bind_wrapper(EditLine *el, unsigned char c)
                   1601: {
                   1602:        if (map[c] == NULL)
                   1603:            return CC_ERROR;
1.49      christos 1604:
                   1605:        _rl_update_pos();
                   1606:
1.35      christos 1607:        (*map[c])(NULL, c);
1.38      christos 1608:
                   1609:        /* If rl_done was set by the above call, deal with it here */
                   1610:        if (rl_done)
                   1611:                return CC_EOF;
                   1612:
1.35      christos 1613:        return CC_NORM;
                   1614: }
                   1615:
                   1616: int
                   1617: rl_add_defun(const char *name, Function *fun, int c)
                   1618: {
                   1619:        char dest[8];
                   1620:        if (c >= sizeof(map) / sizeof(map[0]) || c < 0)
                   1621:                return -1;
                   1622:        map[(unsigned char)c] = fun;
                   1623:        el_set(e, EL_ADDFN, name, name, rl_bind_wrapper);
1.37      christos 1624:        vis(dest, c, VIS_WHITE|VIS_NOSLASH, 0);
                   1625:        el_set(e, EL_BIND, dest, name);
1.35      christos 1626:        return 0;
                   1627: }
                   1628:
                   1629: void
                   1630: rl_callback_read_char()
                   1631: {
1.36      christos 1632:        int count = 0, done = 0;
1.35      christos 1633:        const char *buf = el_gets(e, &count);
                   1634:        char *wbuf;
                   1635:
                   1636:        if (buf == NULL || count-- <= 0)
                   1637:                return;
1.36      christos 1638:        if (count == 0 && buf[0] == CTRL('d'))
                   1639:                done = 1;
                   1640:        if (buf[count] == '\n' || buf[count] == '\r')
                   1641:                done = 2;
                   1642:
                   1643:        if (done && rl_linefunc != NULL) {
1.35      christos 1644:                el_set(e, EL_UNBUFFERED, 0);
1.36      christos 1645:                if (done == 2) {
                   1646:                    if ((wbuf = strdup(buf)) != NULL)
                   1647:                        wbuf[count] = '\0';
                   1648:                } else
                   1649:                        wbuf = NULL;
1.35      christos 1650:                (*(void (*)(const char *))rl_linefunc)(wbuf);
1.48      christos 1651:                el_set(e, EL_UNBUFFERED, 1);
1.35      christos 1652:        }
                   1653: }
                   1654:
                   1655: void
1.54      agc      1656: rl_callback_handler_install (const char *prompt, VCPFunction *linefunc)
1.35      christos 1657: {
                   1658:        if (e == NULL) {
                   1659:                rl_initialize();
                   1660:        }
                   1661:        if (rl_prompt)
                   1662:                free(rl_prompt);
                   1663:        rl_prompt = prompt ? strdup(strchr(prompt, *prompt)) : NULL;
                   1664:        rl_linefunc = linefunc;
                   1665:        el_set(e, EL_UNBUFFERED, 1);
                   1666: }
                   1667:
                   1668: void
                   1669: rl_callback_handler_remove(void)
                   1670: {
                   1671:        el_set(e, EL_UNBUFFERED, 0);
                   1672: }
                   1673:
                   1674: void
                   1675: rl_redisplay(void)
                   1676: {
                   1677:        char a[2];
                   1678:        a[0] = CTRL('r');
                   1679:        a[1] = '\0';
                   1680:        el_push(e, a);
                   1681: }
                   1682:
                   1683: int
                   1684: rl_get_previous_history(int count, int key)
                   1685: {
                   1686:        char a[2];
                   1687:        a[0] = key;
                   1688:        a[1] = '\0';
                   1689:        while (count--)
                   1690:                el_push(e, a);
                   1691:        return 0;
1.38      christos 1692: }
                   1693:
                   1694: void
                   1695: /*ARGSUSED*/
                   1696: rl_prep_terminal(int meta_flag)
                   1697: {
                   1698:        el_set(e, EL_PREP_TERM, 1);
                   1699: }
                   1700:
                   1701: void
                   1702: rl_deprep_terminal()
                   1703: {
                   1704:        el_set(e, EL_PREP_TERM, 0);
                   1705: }
                   1706:
                   1707: int
                   1708: rl_read_init_file(const char *s)
                   1709: {
                   1710:        return(el_source(e, s));
                   1711: }
                   1712:
                   1713: int
                   1714: rl_parse_and_bind(const char *line)
                   1715: {
                   1716:        const char **argv;
                   1717:        int argc;
                   1718:        Tokenizer *tok;
                   1719:
                   1720:        tok = tok_init(NULL);
1.44      lukem    1721:        tok_str(tok, line, &argc, &argv);
1.38      christos 1722:        argc = el_parse(e, argc, argv);
                   1723:        tok_end(tok);
                   1724:        return (argc ? 1 : 0);
                   1725: }
                   1726:
1.51      christos 1727: int
                   1728: rl_variable_bind(const char *var, const char *value)
                   1729: {
                   1730:        /*
                   1731:         * The proper return value is undocument, but this is what the
                   1732:         * readline source seems to do.
                   1733:         */
                   1734:        return ((el_set(e, EL_BIND, "", var, value) == -1) ? 1 : 0);
                   1735: }
                   1736:
1.38      christos 1737: void
                   1738: rl_stuff_char(int c)
                   1739: {
                   1740:        char buf[2];
                   1741:
                   1742:        buf[0] = c;
                   1743:        buf[1] = '\0';
                   1744:        el_insertstr(e, buf);
                   1745: }
                   1746:
                   1747: static int
                   1748: _rl_event_read_char(EditLine *el, char *cp)
                   1749: {
1.43      christos 1750:        int     n, num_read = 0;
1.38      christos 1751:
                   1752:        *cp = 0;
                   1753:        while (rl_event_hook) {
                   1754:
                   1755:                (*rl_event_hook)();
                   1756:
                   1757: #if defined(FIONREAD)
                   1758:                if (ioctl(el->el_infd, FIONREAD, &n) < 0)
                   1759:                        return(-1);
                   1760:                if (n)
                   1761:                        num_read = read(el->el_infd, cp, 1);
                   1762:                else
                   1763:                        num_read = 0;
                   1764: #elif defined(F_SETFL) && defined(O_NDELAY)
                   1765:                if ((n = fcntl(el->el_infd, F_GETFL, 0)) < 0)
                   1766:                        return(-1);
                   1767:                if (fcntl(el->el_infd, F_SETFL, n|O_NDELAY) < 0)
                   1768:                        return(-1);
                   1769:                num_read = read(el->el_infd, cp, 1);
                   1770:                if (fcntl(el->el_infd, F_SETFL, n))
                   1771:                        return(-1);
                   1772: #else
                   1773:                /* not non-blocking, but what you gonna do? */
                   1774:                num_read = read(el->el_infd, cp, 1);
                   1775:                return(-1);
                   1776: #endif
                   1777:
                   1778:                if (num_read < 0 && errno == EAGAIN)
                   1779:                        continue;
                   1780:                if (num_read == 0)
                   1781:                        continue;
                   1782:                break;
                   1783:        }
                   1784:        if (!rl_event_hook)
                   1785:                el_set(el, EL_GETCFN, EL_BUILTIN_GETCFN);
                   1786:        return(num_read);
1.1       christos 1787: }
1.49      christos 1788:
                   1789: static void
                   1790: _rl_update_pos(void)
                   1791: {
                   1792:        const LineInfo *li = el_line(e);
                   1793:
                   1794:        rl_point = li->cursor - li->buffer;
                   1795:        rl_end = li->lastchar - li->buffer;
                   1796: }

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