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Annotation of src/lib/libedit/readline.c, Revision 1.56

1.56    ! christos    1: /*     $NetBSD: readline.c,v 1.55 2005/05/27 14:01:46 agc 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)
1.56    ! christos   41: __RCSID("$NetBSD: readline.c,v 1.55 2005/05/27 14:01:46 agc 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 *);
                    163: static HIST_ENTRY      *_move_history(int);
1.40      christos  164: static int              _history_expand_command(const char *, size_t, size_t,
                    165:     char **);
1.11      lukem     166: static char            *_rl_compat_sub(const char *, const char *,
1.40      christos  167:     const char *, int);
1.38      christos  168: static int              _rl_event_read_char(EditLine *, char *);
1.49      christos  169: static void             _rl_update_pos(void);
1.1       christos  170:
1.5       christos  171:
                    172: /* ARGSUSED */
1.1       christos  173: static char *
1.30      christos  174: _get_prompt(EditLine *el __attribute__((__unused__)))
1.1       christos  175: {
1.32      christos  176:        rl_already_prompted = 1;
                    177:        return (rl_prompt);
1.1       christos  178: }
                    179:
1.11      lukem     180:
1.1       christos  181: /*
                    182:  * generic function for moving around history
                    183:  */
1.2       christos  184: static HIST_ENTRY *
1.11      lukem     185: _move_history(int op)
1.1       christos  186: {
                    187:        HistEvent ev;
                    188:        static HIST_ENTRY rl_he;
                    189:
                    190:        if (history(h, &ev, op) != 0)
                    191:                return (HIST_ENTRY *) NULL;
                    192:
                    193:        rl_he.line = ev.str;
1.40      christos  194:        rl_he.data = NULL;
1.1       christos  195:
1.11      lukem     196:        return (&rl_he);
1.1       christos  197: }
                    198:
                    199:
1.7       simonb    200: /*
                    201:  * READLINE compatibility stuff
1.1       christos  202:  */
                    203:
                    204: /*
                    205:  * initialize rl compat stuff
                    206:  */
                    207: int
1.11      lukem     208: rl_initialize(void)
1.1       christos  209: {
                    210:        HistEvent ev;
                    211:        const LineInfo *li;
1.18      christos  212:        int editmode = 1;
                    213:        struct termios t;
1.1       christos  214:
                    215:        if (e != NULL)
                    216:                el_end(e);
                    217:        if (h != NULL)
                    218:                history_end(h);
                    219:
                    220:        if (!rl_instream)
                    221:                rl_instream = stdin;
                    222:        if (!rl_outstream)
                    223:                rl_outstream = stdout;
1.18      christos  224:
                    225:        /*
                    226:         * See if we don't really want to run the editor
                    227:         */
                    228:        if (tcgetattr(fileno(rl_instream), &t) != -1 && (t.c_lflag & ECHO) == 0)
                    229:                editmode = 0;
                    230:
1.4       christos  231:        e = el_init(rl_readline_name, rl_instream, rl_outstream, stderr);
1.18      christos  232:
                    233:        if (!editmode)
                    234:                el_set(e, EL_EDITMODE, 0);
1.1       christos  235:
                    236:        h = history_init();
                    237:        if (!e || !h)
1.11      lukem     238:                return (-1);
1.1       christos  239:
1.4       christos  240:        history(h, &ev, H_SETSIZE, INT_MAX);    /* unlimited */
1.1       christos  241:        history_length = 0;
                    242:        max_input_history = INT_MAX;
                    243:        el_set(e, EL_HIST, history, h);
                    244:
                    245:        /* for proper prompt printing in readline() */
1.32      christos  246:        rl_prompt = strdup("");
                    247:        if (rl_prompt == NULL) {
1.23      christos  248:                history_end(h);
                    249:                el_end(e);
                    250:                return -1;
                    251:        }
1.1       christos  252:        el_set(e, EL_PROMPT, _get_prompt);
1.39      christos  253:        el_set(e, EL_SIGNAL, rl_catch_signals);
1.1       christos  254:
                    255:        /* set default mode to "emacs"-style and read setting afterwards */
                    256:        /* so this can be overriden */
                    257:        el_set(e, EL_EDITOR, "emacs");
1.32      christos  258:        if (rl_terminal_name != NULL)
                    259:                el_set(e, EL_TERMINAL, rl_terminal_name);
                    260:        else
                    261:                el_get(e, EL_TERMINAL, &rl_terminal_name);
1.1       christos  262:
1.12      jdolecek  263:        /*
1.35      christos  264:         * Word completion - this has to go AFTER rebinding keys
1.12      jdolecek  265:         * to emacs-style.
                    266:         */
1.1       christos  267:        el_set(e, EL_ADDFN, "rl_complete",
1.35      christos  268:            "ReadLine compatible completion function",
1.11      lukem     269:            _el_rl_complete);
1.1       christos  270:        el_set(e, EL_BIND, "^I", "rl_complete", NULL);
1.46      christos  271:
                    272:        /*
                    273:         * Send TSTP when ^Z is pressed.
                    274:         */
                    275:        el_set(e, EL_ADDFN, "rl_tstp",
                    276:            "ReadLine compatible suspend function",
                    277:            _el_rl_tstp);
                    278:        el_set(e, EL_BIND, "^Z", "rl_tstp", NULL);
1.12      jdolecek  279:
1.1       christos  280:        /* read settings from configuration file */
                    281:        el_source(e, NULL);
                    282:
1.12      jdolecek  283:        /*
                    284:         * Unfortunately, some applications really do use rl_point
                    285:         * and rl_line_buffer directly.
                    286:         */
1.1       christos  287:        li = el_line(e);
1.20      christos  288:        /* a cheesy way to get rid of const cast. */
                    289:        rl_line_buffer = memchr(li->buffer, *li->buffer, 1);
1.49      christos  290:        _rl_update_pos();
1.1       christos  291:
1.32      christos  292:        if (rl_startup_hook)
                    293:                (*rl_startup_hook)(NULL, 0);
                    294:
1.11      lukem     295:        return (0);
1.1       christos  296: }
                    297:
1.11      lukem     298:
1.1       christos  299: /*
                    300:  * read one line from input stream and return it, chomping
                    301:  * trailing newline (if there is any)
                    302:  */
                    303: char *
                    304: readline(const char *prompt)
                    305: {
                    306:        HistEvent ev;
1.3       thorpej   307:        int count;
1.1       christos  308:        const char *ret;
1.20      christos  309:        char *buf;
1.38      christos  310:        static int used_event_hook;
1.1       christos  311:
                    312:        if (e == NULL || h == NULL)
                    313:                rl_initialize();
                    314:
1.38      christos  315:        rl_done = 0;
                    316:
1.9       jdolecek  317:        /* update prompt accordingly to what has been passed */
1.11      lukem     318:        if (!prompt)
                    319:                prompt = "";
1.32      christos  320:        if (strcmp(rl_prompt, prompt) != 0) {
                    321:                free(rl_prompt);
                    322:                rl_prompt = strdup(prompt);
                    323:                if (rl_prompt == NULL)
1.23      christos  324:                        return NULL;
1.1       christos  325:        }
1.32      christos  326:
                    327:        if (rl_pre_input_hook)
                    328:                (*rl_pre_input_hook)(NULL, 0);
                    329:
1.38      christos  330:        if (rl_event_hook && !(e->el_flags&NO_TTY)) {
                    331:                el_set(e, EL_GETCFN, _rl_event_read_char);
                    332:                used_event_hook = 1;
                    333:        }
                    334:
                    335:        if (!rl_event_hook && used_event_hook) {
                    336:                el_set(e, EL_GETCFN, EL_BUILTIN_GETCFN);
                    337:                used_event_hook = 0;
                    338:        }
                    339:
1.32      christos  340:        rl_already_prompted = 0;
                    341:
1.1       christos  342:        /* get one line from input stream */
                    343:        ret = el_gets(e, &count);
                    344:
                    345:        if (ret && count > 0) {
1.5       christos  346:                int lastidx;
1.1       christos  347:
1.20      christos  348:                buf = strdup(ret);
1.23      christos  349:                if (buf == NULL)
                    350:                        return NULL;
1.1       christos  351:                lastidx = count - 1;
1.20      christos  352:                if (buf[lastidx] == '\n')
                    353:                        buf[lastidx] = '\0';
1.1       christos  354:        } else
1.20      christos  355:                buf = NULL;
1.1       christos  356:
                    357:        history(h, &ev, H_GETSIZE);
                    358:        history_length = ev.num;
                    359:
1.20      christos  360:        return buf;
1.1       christos  361: }
                    362:
                    363: /*
                    364:  * history functions
                    365:  */
                    366:
                    367: /*
                    368:  * is normally called before application starts to use
                    369:  * history expansion functions
                    370:  */
                    371: void
1.11      lukem     372: using_history(void)
1.1       christos  373: {
                    374:        if (h == NULL || e == NULL)
                    375:                rl_initialize();
                    376: }
                    377:
1.11      lukem     378:
1.1       christos  379: /*
                    380:  * substitute ``what'' with ``with'', returning resulting string; if
1.29      wiz       381:  * globally == 1, substitutes all occurrences of what, otherwise only the
1.1       christos  382:  * first one
                    383:  */
1.11      lukem     384: static char *
                    385: _rl_compat_sub(const char *str, const char *what, const char *with,
                    386:     int globally)
                    387: {
1.40      christos  388:        const   char    *s;
                    389:        char    *r, *result;
                    390:        size_t  len, with_len, what_len;
1.1       christos  391:
1.40      christos  392:        len = strlen(str);
                    393:        with_len = strlen(with);
                    394:        what_len = strlen(what);
                    395:
                    396:        /* calculate length we need for result */
                    397:        s = str;
                    398:        while (*s) {
                    399:                if (*s == *what && !strncmp(s, what, what_len)) {
                    400:                        len += with_len - what_len;
                    401:                        if (!globally)
                    402:                                break;
                    403:                        s += what_len;
                    404:                } else
                    405:                        s++;
                    406:        }
                    407:        r = result = malloc(len + 1);
1.23      christos  408:        if (result == NULL)
                    409:                return NULL;
1.40      christos  410:        s = str;
                    411:        while (*s) {
                    412:                if (*s == *what && !strncmp(s, what, what_len)) {
                    413:                        (void)strncpy(r, with, with_len);
                    414:                        r += with_len;
                    415:                        s += what_len;
                    416:                        if (!globally) {
                    417:                                (void)strcpy(r, s);
                    418:                                return(result);
1.1       christos  419:                        }
1.40      christos  420:                } else
                    421:                        *r++ = *s++;
                    422:        }
                    423:        *r = 0;
                    424:        return(result);
                    425: }
                    426:
                    427: static char    *last_search_pat;       /* last !?pat[?] search pattern */
                    428: static char    *last_search_match;     /* last !?pat[?] that matched */
                    429:
                    430: const char *
                    431: get_history_event(const char *cmd, int *cindex, int qchar)
                    432: {
                    433:        int idx, sign, sub, num, begin, ret;
                    434:        size_t len;
                    435:        char    *pat;
                    436:        const char *rptr;
                    437:        HistEvent ev;
                    438:
                    439:        idx = *cindex;
                    440:        if (cmd[idx++] != history_expansion_char)
                    441:                return(NULL);
                    442:
                    443:        /* find out which event to take */
                    444:        if (cmd[idx] == history_expansion_char || cmd[idx] == 0) {
                    445:                if (history(h, &ev, H_FIRST) != 0)
                    446:                        return(NULL);
                    447:                *cindex = cmd[idx]? (idx + 1):idx;
                    448:                return(ev.str);
                    449:        }
                    450:        sign = 0;
                    451:        if (cmd[idx] == '-') {
                    452:                sign = 1;
                    453:                idx++;
                    454:        }
                    455:
                    456:        if ('0' <= cmd[idx] && cmd[idx] <= '9') {
                    457:                HIST_ENTRY *rl_he;
                    458:
                    459:                num = 0;
                    460:                while (cmd[idx] && '0' <= cmd[idx] && cmd[idx] <= '9') {
                    461:                        num = num * 10 + cmd[idx] - '0';
                    462:                        idx++;
                    463:                }
                    464:                if (sign)
                    465:                        num = history_length - num + 1;
                    466:
                    467:                if (!(rl_he = history_get(num)))
                    468:                        return(NULL);
                    469:
                    470:                *cindex = idx;
                    471:                return(rl_he->line);
                    472:        }
                    473:        sub = 0;
                    474:        if (cmd[idx] == '?') {
                    475:                sub = 1;
                    476:                idx++;
                    477:        }
                    478:        begin = idx;
                    479:        while (cmd[idx]) {
                    480:                if (cmd[idx] == '\n')
                    481:                        break;
                    482:                if (sub && cmd[idx] == '?')
                    483:                        break;
                    484:                if (!sub && (cmd[idx] == ':' || cmd[idx] == ' '
                    485:                                    || cmd[idx] == '\t' || cmd[idx] == qchar))
                    486:                        break;
                    487:                idx++;
                    488:        }
                    489:        len = idx - begin;
                    490:        if (sub && cmd[idx] == '?')
                    491:                idx++;
                    492:        if (sub && len == 0 && last_search_pat && *last_search_pat)
                    493:                pat = last_search_pat;
                    494:        else if (len == 0)
                    495:                return(NULL);
                    496:        else {
                    497:                if ((pat = malloc(len + 1)) == NULL)
                    498:                        return NULL;
                    499:                (void)strncpy(pat, cmd + begin, len);
                    500:                pat[len] = '\0';
                    501:        }
                    502:
                    503:        if (history(h, &ev, H_CURR) != 0) {
                    504:                if (pat != last_search_pat)
                    505:                        free(pat);
                    506:                return (NULL);
                    507:        }
                    508:        num = ev.num;
                    509:
                    510:        if (sub) {
                    511:                if (pat != last_search_pat) {
                    512:                        if (last_search_pat)
                    513:                                free(last_search_pat);
                    514:                        last_search_pat = pat;
1.1       christos  515:                }
1.40      christos  516:                ret = history_search(pat, -1);
                    517:        } else
                    518:                ret = history_search_prefix(pat, -1);
                    519:
                    520:        if (ret == -1) {
                    521:                /* restore to end of list on failed search */
                    522:                history(h, &ev, H_FIRST);
                    523:                (void)fprintf(rl_outstream, "%s: Event not found\n", pat);
                    524:                if (pat != last_search_pat)
                    525:                        free(pat);
                    526:                return(NULL);
                    527:        }
                    528:
                    529:        if (sub && len) {
                    530:                if (last_search_match && last_search_match != pat)
                    531:                        free(last_search_match);
                    532:                last_search_match = pat;
                    533:        }
                    534:
                    535:        if (pat != last_search_pat)
                    536:                free(pat);
                    537:
                    538:        if (history(h, &ev, H_CURR) != 0)
                    539:                return(NULL);
                    540:        *cindex = idx;
                    541:        rptr = ev.str;
                    542:
                    543:        /* roll back to original position */
                    544:        (void)history(h, &ev, H_SET, num);
1.1       christos  545:
1.40      christos  546:        return rptr;
1.1       christos  547: }
                    548:
                    549: /*
                    550:  * the real function doing history expansion - takes as argument command
                    551:  * to do and data upon which the command should be executed
                    552:  * does expansion the way I've understood readline documentation
                    553:  *
                    554:  * returns 0 if data was not modified, 1 if it was and 2 if the string
                    555:  * should be only printed and not executed; in case of error,
                    556:  * returns -1 and *result points to NULL
                    557:  * it's callers responsibility to free() string returned in *result
                    558:  */
                    559: static int
1.40      christos  560: _history_expand_command(const char *command, size_t offs, size_t cmdlen,
                    561:     char **result)
1.11      lukem     562: {
1.40      christos  563:        char *tmp, *search = NULL, *aptr;
                    564:        const char *ptr, *cmd;
1.11      lukem     565:        static char *from = NULL, *to = NULL;
1.40      christos  566:        int start, end, idx, has_mods = 0;
                    567:        int p_on = 0, g_on = 0;
1.1       christos  568:
                    569:        *result = NULL;
1.40      christos  570:        aptr = NULL;
1.41      christos  571:        ptr = NULL;
1.1       christos  572:
1.40      christos  573:        /* First get event specifier */
                    574:        idx = 0;
1.1       christos  575:
1.40      christos  576:        if (strchr(":^*$", command[offs + 1])) {
                    577:                char str[4];
                    578:                /*
                    579:                * "!:" is shorthand for "!!:".
                    580:                * "!^", "!*" and "!$" are shorthand for
                    581:                * "!!:^", "!!:*" and "!!:$" respectively.
                    582:                */
                    583:                str[0] = str[1] = '!';
                    584:                str[2] = '0';
                    585:                ptr = get_history_event(str, &idx, 0);
                    586:                idx = (command[offs + 1] == ':')? 1:0;
                    587:                has_mods = 1;
1.1       christos  588:        } else {
1.40      christos  589:                if (command[offs + 1] == '#') {
                    590:                        /* use command so far */
                    591:                        if ((aptr = malloc(offs + 1)) == NULL)
                    592:                                return -1;
                    593:                        (void)strncpy(aptr, command, offs);
                    594:                        aptr[offs] = '\0';
                    595:                        idx = 1;
1.1       christos  596:                } else {
1.40      christos  597:                        int     qchar;
                    598:
                    599:                        qchar = (offs > 0 && command[offs - 1] == '"')? '"':0;
                    600:                        ptr = get_history_event(command + offs, &idx, qchar);
                    601:                }
                    602:                has_mods = command[offs + idx] == ':';
                    603:        }
1.1       christos  604:
1.40      christos  605:        if (ptr == NULL && aptr == NULL)
                    606:                return(-1);
1.1       christos  607:
1.40      christos  608:        if (!has_mods) {
                    609:                *result = strdup(aptr? aptr : ptr);
                    610:                if (aptr)
                    611:                        free(aptr);
                    612:                return(1);
                    613:        }
                    614:
                    615:        cmd = command + offs + idx + 1;
                    616:
                    617:        /* Now parse any word designators */
                    618:
                    619:        if (*cmd == '%')        /* last word matched by ?pat? */
                    620:                tmp = strdup(last_search_match? last_search_match:"");
                    621:        else if (strchr("^*$-0123456789", *cmd)) {
                    622:                start = end = -1;
                    623:                if (*cmd == '^')
                    624:                        start = end = 1, cmd++;
                    625:                else if (*cmd == '$')
                    626:                        start = -1, cmd++;
                    627:                else if (*cmd == '*')
                    628:                        start = 1, cmd++;
                    629:               else if (*cmd == '-' || isdigit((unsigned char) *cmd)) {
                    630:                        start = 0;
                    631:                        while (*cmd && '0' <= *cmd && *cmd <= '9')
                    632:                                start = start * 10 + *cmd++ - '0';
                    633:
                    634:                        if (*cmd == '-') {
                    635:                                if (isdigit((unsigned char) cmd[1])) {
                    636:                                        cmd++;
                    637:                                        end = 0;
                    638:                                        while (*cmd && '0' <= *cmd && *cmd <= '9')
                    639:                                                end = end * 10 + *cmd++ - '0';
                    640:                                } else if (cmd[1] == '$') {
                    641:                                        cmd += 2;
                    642:                                        end = -1;
                    643:                                } else {
                    644:                                        cmd++;
                    645:                                        end = -2;
                    646:                                }
                    647:                        } else if (*cmd == '*')
                    648:                                end = -1, cmd++;
1.1       christos  649:                        else
1.40      christos  650:                                end = start;
                    651:                }
                    652:                tmp = history_arg_extract(start, end, aptr? aptr:ptr);
                    653:                if (tmp == NULL) {
                    654:                        (void)fprintf(rl_outstream, "%s: Bad word specifier",
                    655:                            command + offs + idx);
                    656:                        if (aptr)
                    657:                                free(aptr);
                    658:                        return(-1);
                    659:                }
                    660:        } else
                    661:                tmp = strdup(aptr? aptr:ptr);
1.1       christos  662:
1.40      christos  663:        if (aptr)
                    664:                free(aptr);
1.1       christos  665:
1.40      christos  666:        if (*cmd == 0 || (cmd - (command + offs) >= cmdlen)) {
                    667:                *result = tmp;
                    668:                return(1);
1.1       christos  669:        }
                    670:
                    671:        for (; *cmd; cmd++) {
                    672:                if (*cmd == ':')
                    673:                        continue;
1.40      christos  674:                else if (*cmd == 'h') {         /* remove trailing path */
                    675:                        if ((aptr = strrchr(tmp, '/')) != NULL)
                    676:                                *aptr = 0;
                    677:                } else if (*cmd == 't') {       /* remove leading path */
                    678:                        if ((aptr = strrchr(tmp, '/')) != NULL) {
                    679:                                aptr = strdup(aptr + 1);
                    680:                                free(tmp);
                    681:                                tmp = aptr;
                    682:                        }
                    683:                } else if (*cmd == 'r') {       /* remove trailing suffix */
                    684:                        if ((aptr = strrchr(tmp, '.')) != NULL)
                    685:                                *aptr = 0;
                    686:                } else if (*cmd == 'e') {       /* remove all but suffix */
                    687:                        if ((aptr = strrchr(tmp, '.')) != NULL) {
                    688:                                aptr = strdup(aptr);
                    689:                                free(tmp);
                    690:                                tmp = aptr;
                    691:                        }
                    692:                } else if (*cmd == 'p')         /* print only */
                    693:                        p_on = 1;
1.1       christos  694:                else if (*cmd == 'g')
                    695:                        g_on = 2;
                    696:                else if (*cmd == 's' || *cmd == '&') {
1.11      lukem     697:                        char *what, *with, delim;
1.30      christos  698:                        size_t len, from_len;
1.5       christos  699:                        size_t size;
1.1       christos  700:
                    701:                        if (*cmd == '&' && (from == NULL || to == NULL))
                    702:                                continue;
                    703:                        else if (*cmd == 's') {
                    704:                                delim = *(++cmd), cmd++;
                    705:                                size = 16;
1.5       christos  706:                                what = realloc(from, size);
1.23      christos  707:                                if (what == NULL) {
                    708:                                        free(from);
1.28      christos  709:                                        return 0;
1.23      christos  710:                                }
1.1       christos  711:                                len = 0;
                    712:                                for (; *cmd && *cmd != delim; cmd++) {
1.40      christos  713:                                        if (*cmd == '\\' && cmd[1] == delim)
1.1       christos  714:                                                cmd++;
1.23      christos  715:                                        if (len >= size) {
                    716:                                                char *nwhat;
                    717:                                                nwhat = realloc(what,
1.40      christos  718:                                                                (size <<= 1));
1.23      christos  719:                                                if (nwhat == NULL) {
                    720:                                                        free(what);
1.28      christos  721:                                                        return 0;
1.23      christos  722:                                                }
                    723:                                                what = nwhat;
                    724:                                        }
1.1       christos  725:                                        what[len++] = *cmd;
                    726:                                }
                    727:                                what[len] = '\0';
                    728:                                from = what;
                    729:                                if (*what == '\0') {
                    730:                                        free(what);
1.23      christos  731:                                        if (search) {
1.1       christos  732:                                                from = strdup(search);
1.23      christos  733:                                                if (from == NULL)
1.28      christos  734:                                                        return 0;
1.23      christos  735:                                        } else {
1.1       christos  736:                                                from = NULL;
1.11      lukem     737:                                                return (-1);
1.1       christos  738:                                        }
                    739:                                }
                    740:                                cmd++;  /* shift after delim */
                    741:                                if (!*cmd)
                    742:                                        continue;
                    743:
                    744:                                size = 16;
1.5       christos  745:                                with = realloc(to, size);
1.23      christos  746:                                if (with == NULL) {
                    747:                                        free(to);
                    748:                                        return -1;
                    749:                                }
1.1       christos  750:                                len = 0;
                    751:                                from_len = strlen(from);
                    752:                                for (; *cmd && *cmd != delim; cmd++) {
                    753:                                        if (len + from_len + 1 >= size) {
1.23      christos  754:                                                char *nwith;
1.1       christos  755:                                                size += from_len + 1;
1.23      christos  756:                                                nwith = realloc(with, size);
                    757:                                                if (nwith == NULL) {
                    758:                                                        free(with);
                    759:                                                        return -1;
                    760:                                                }
                    761:                                                with = nwith;
1.1       christos  762:                                        }
                    763:                                        if (*cmd == '&') {
                    764:                                                /* safe */
1.40      christos  765:                                                (void)strcpy(&with[len], from);
1.1       christos  766:                                                len += from_len;
                    767:                                                continue;
                    768:                                        }
                    769:                                        if (*cmd == '\\'
                    770:                                            && (*(cmd + 1) == delim
                    771:                                                || *(cmd + 1) == '&'))
                    772:                                                cmd++;
                    773:                                        with[len++] = *cmd;
                    774:                                }
                    775:                                with[len] = '\0';
                    776:                                to = with;
                    777:                        }
                    778:
1.40      christos  779:                        aptr = _rl_compat_sub(tmp, from, to, g_on);
                    780:                        if (aptr) {
                    781:                                free(tmp);
                    782:                                tmp = aptr;
1.23      christos  783:                        }
1.40      christos  784:                        g_on = 0;
1.1       christos  785:                }
1.5       christos  786:        }
1.40      christos  787:        *result = tmp;
                    788:        return (p_on? 2:1);
1.1       christos  789: }
                    790:
1.11      lukem     791:
1.1       christos  792: /*
                    793:  * csh-style history expansion
                    794:  */
                    795: int
1.11      lukem     796: history_expand(char *str, char **output)
                    797: {
1.40      christos  798:        int ret = 0;
                    799:        size_t idx, i, size;
                    800:        char *tmp, *result;
1.1       christos  801:
                    802:        if (h == NULL || e == NULL)
                    803:                rl_initialize();
                    804:
1.40      christos  805:        if (history_expansion_char == 0) {
                    806:                *output = strdup(str);
                    807:                return(0);
                    808:        }
1.1       christos  809:
1.40      christos  810:        *output = NULL;
1.1       christos  811:        if (str[0] == history_subst_char) {
                    812:                /* ^foo^foo2^ is equivalent to !!:s^foo^foo2^ */
1.40      christos  813:                *output = malloc(strlen(str) + 4 + 1);
                    814:                if (*output == NULL)
                    815:                        return 0;
                    816:                (*output)[0] = (*output)[1] = history_expansion_char;
                    817:                (*output)[2] = ':';
                    818:                (*output)[3] = 's';
                    819:                (void)strcpy((*output) + 4, str);
                    820:                str = *output;
                    821:        } else {
                    822:                *output = strdup(str);
                    823:                if (*output == NULL)
                    824:                        return 0;
1.1       christos  825:        }
1.40      christos  826:
                    827: #define ADD_STRING(what, len)                                          \
1.1       christos  828:        {                                                               \
1.23      christos  829:                if (idx + len + 1 > size) {                             \
                    830:                        char *nresult = realloc(result, (size += len + 1));\
                    831:                        if (nresult == NULL) {                          \
                    832:                                free(*output);                          \
1.28      christos  833:                                return 0;                               \
1.23      christos  834:                        }                                               \
                    835:                        result = nresult;                               \
                    836:                }                                                       \
1.1       christos  837:                (void)strncpy(&result[idx], what, len);                 \
                    838:                idx += len;                                             \
                    839:                result[idx] = '\0';                                     \
                    840:        }
                    841:
                    842:        result = NULL;
                    843:        size = idx = 0;
                    844:        for (i = 0; str[i];) {
1.40      christos  845:                int qchar, loop_again;
                    846:                size_t len, start, j;
1.1       christos  847:
1.40      christos  848:                qchar = 0;
1.1       christos  849:                loop_again = 1;
                    850:                start = j = i;
                    851: loop:
                    852:                for (; str[j]; j++) {
                    853:                        if (str[j] == '\\' &&
                    854:                            str[j + 1] == history_expansion_char) {
1.40      christos  855:                                (void)strcpy(&str[j], &str[j + 1]);
1.1       christos  856:                                continue;
                    857:                        }
                    858:                        if (!loop_again) {
1.40      christos  859:                                if (isspace((unsigned char) str[j])
                    860:                                    || str[j] == qchar)
1.1       christos  861:                                        break;
                    862:                        }
                    863:                        if (str[j] == history_expansion_char
                    864:                            && !strchr(history_no_expand_chars, str[j + 1])
                    865:                            && (!history_inhibit_expansion_function ||
1.40      christos  866:                            (*history_inhibit_expansion_function)(str,
                    867:                            (int)j) == 0))
1.1       christos  868:                                break;
                    869:                }
                    870:
1.40      christos  871:                if (str[j] && loop_again) {
1.1       christos  872:                        i = j;
1.40      christos  873:                        qchar = (j > 0 && str[j - 1] == '"' )? '"':0;
1.1       christos  874:                        j++;
                    875:                        if (str[j] == history_expansion_char)
                    876:                                j++;
                    877:                        loop_again = 0;
                    878:                        goto loop;
                    879:                }
                    880:                len = i - start;
1.40      christos  881:                tmp = &str[start];
                    882:                ADD_STRING(tmp, len);
1.1       christos  883:
1.40      christos  884:                if (str[i] == '\0' || str[i] != history_expansion_char) {
1.1       christos  885:                        len = j - i;
1.40      christos  886:                        tmp = &str[i];
                    887:                        ADD_STRING(tmp, len);
1.1       christos  888:                        if (start == 0)
1.40      christos  889:                                ret = 0;
1.1       christos  890:                        else
1.40      christos  891:                                ret = 1;
1.1       christos  892:                        break;
                    893:                }
1.40      christos  894:                ret = _history_expand_command (str, i, (j - i), &tmp);
                    895:                if (ret > 0 && tmp) {
                    896:                        len = strlen(tmp);
                    897:                        ADD_STRING(tmp, len);
                    898:                        free(tmp);
1.1       christos  899:                }
                    900:                i = j;
1.40      christos  901:        }
1.1       christos  902:
1.40      christos  903:        /* ret is 2 for "print only" option */
                    904:        if (ret == 2) {
                    905:                add_history(result);
1.1       christos  906: #ifdef GDB_411_HACK
                    907:                /* gdb 4.11 has been shipped with readline, where */
                    908:                /* history_expand() returned -1 when the line     */
                    909:                /* should not be executed; in readline 2.1+       */
                    910:                /* it should return 2 in such a case              */
1.40      christos  911:                ret = -1;
1.1       christos  912: #endif
                    913:        }
                    914:        free(*output);
                    915:        *output = result;
                    916:
1.40      christos  917:        return (ret);
1.1       christos  918: }
                    919:
1.40      christos  920: /*
                    921: * Return a string consisting of arguments of "str" from "start" to "end".
                    922: */
                    923: char *
                    924: history_arg_extract(int start, int end, const char *str)
                    925: {
                    926:        size_t  i, len, max;
                    927:        char    **arr, *result;
                    928:
                    929:        arr = history_tokenize(str);
                    930:        if (!arr)
                    931:                return(NULL);
                    932:        if (arr && *arr == NULL) {
                    933:                free(arr);
                    934:                return(NULL);
                    935:        }
                    936:
                    937:        for (max = 0; arr[max]; max++)
                    938:                continue;
                    939:        max--;
                    940:
                    941:        if (start == '$')
                    942:                start = max;
                    943:        if (end == '$')
                    944:                end = max;
                    945:        if (end < 0)
                    946:                end = max + end + 1;
                    947:        if (start < 0)
                    948:                start = end;
                    949:
                    950:        if (start < 0 || end < 0 || start > max || end > max || start > end)
                    951:                return(NULL);
                    952:
                    953:        for (i = start, len = 0; i <= end; i++)
                    954:                len += strlen(arr[i]) + 1;
                    955:        len++;
                    956:        result = malloc(len);
                    957:        if (result == NULL)
                    958:                return NULL;
                    959:
                    960:        for (i = start, len = 0; i <= end; i++) {
                    961:                (void)strcpy(result + len, arr[i]);
                    962:                len += strlen(arr[i]);
                    963:                if (i < end)
                    964:                        result[len++] = ' ';
                    965:        }
                    966:        result[len] = 0;
                    967:
                    968:        for (i = 0; arr[i]; i++)
                    969:                free(arr[i]);
                    970:        free(arr);
                    971:
                    972:        return(result);
                    973: }
1.11      lukem     974:
1.1       christos  975: /*
1.40      christos  976:  * Parse the string into individual tokens,
                    977:  * similar to how shell would do it.
1.1       christos  978:  */
                    979: char **
1.11      lukem     980: history_tokenize(const char *str)
1.1       christos  981: {
1.40      christos  982:        int size = 1, idx = 0, i, start;
1.5       christos  983:        size_t len;
1.1       christos  984:        char **result = NULL, *temp, delim = '\0';
                    985:
1.40      christos  986:        for (i = 0; str[i];) {
1.4       christos  987:                while (isspace((unsigned char) str[i]))
1.1       christos  988:                        i++;
                    989:                start = i;
1.40      christos  990:                for (; str[i];) {
1.9       jdolecek  991:                        if (str[i] == '\\') {
1.14      jdolecek  992:                                if (str[i+1] != '\0')
1.9       jdolecek  993:                                        i++;
                    994:                        } else if (str[i] == delim)
1.1       christos  995:                                delim = '\0';
                    996:                        else if (!delim &&
1.11      lukem     997:                                    (isspace((unsigned char) str[i]) ||
                    998:                                strchr("()<>;&|$", str[i])))
1.1       christos  999:                                break;
                   1000:                        else if (!delim && strchr("'`\"", str[i]))
                   1001:                                delim = str[i];
1.40      christos 1002:                        if (str[i])
                   1003:                                i++;
1.1       christos 1004:                }
                   1005:
1.40      christos 1006:                if (idx + 2 >= size) {
1.23      christos 1007:                        char **nresult;
1.1       christos 1008:                        size <<= 1;
1.23      christos 1009:                        nresult = realloc(result, size * sizeof(char *));
                   1010:                        if (nresult == NULL) {
                   1011:                                free(result);
                   1012:                                return NULL;
                   1013:                        }
                   1014:                        result = nresult;
1.1       christos 1015:                }
                   1016:                len = i - start;
                   1017:                temp = malloc(len + 1);
1.23      christos 1018:                if (temp == NULL) {
1.40      christos 1019:                        for (i = 0; i < idx; i++)
                   1020:                                free(result[i]);
1.23      christos 1021:                        free(result);
                   1022:                        return NULL;
                   1023:                }
1.40      christos 1024:                (void)strncpy(temp, &str[start], len);
1.1       christos 1025:                temp[len] = '\0';
1.40      christos 1026:                result[idx++] = temp;
                   1027:                result[idx] = NULL;
                   1028:                if (str[i])
                   1029:                        i++;
1.1       christos 1030:        }
1.11      lukem    1031:        return (result);
1.1       christos 1032: }
                   1033:
1.11      lukem    1034:
1.1       christos 1035: /*
                   1036:  * limit size of history record to ``max'' events
                   1037:  */
                   1038: void
1.11      lukem    1039: stifle_history(int max)
1.1       christos 1040: {
                   1041:        HistEvent ev;
                   1042:
                   1043:        if (h == NULL || e == NULL)
                   1044:                rl_initialize();
                   1045:
1.4       christos 1046:        if (history(h, &ev, H_SETSIZE, max) == 0)
1.1       christos 1047:                max_input_history = max;
                   1048: }
                   1049:
1.11      lukem    1050:
1.1       christos 1051: /*
                   1052:  * "unlimit" size of history - set the limit to maximum allowed int value
                   1053:  */
                   1054: int
1.11      lukem    1055: unstifle_history(void)
1.1       christos 1056: {
                   1057:        HistEvent ev;
                   1058:        int omax;
                   1059:
1.4       christos 1060:        history(h, &ev, H_SETSIZE, INT_MAX);
1.1       christos 1061:        omax = max_input_history;
                   1062:        max_input_history = INT_MAX;
1.11      lukem    1063:        return (omax);          /* some value _must_ be returned */
1.1       christos 1064: }
                   1065:
1.11      lukem    1066:
1.1       christos 1067: int
1.11      lukem    1068: history_is_stifled(void)
1.1       christos 1069: {
1.11      lukem    1070:
1.1       christos 1071:        /* cannot return true answer */
                   1072:        return (max_input_history != INT_MAX);
                   1073: }
                   1074:
1.11      lukem    1075:
1.1       christos 1076: /*
                   1077:  * read history from a file given
                   1078:  */
                   1079: int
1.11      lukem    1080: read_history(const char *filename)
1.1       christos 1081: {
                   1082:        HistEvent ev;
                   1083:
                   1084:        if (h == NULL || e == NULL)
                   1085:                rl_initialize();
1.11      lukem    1086:        return (history(h, &ev, H_LOAD, filename));
1.1       christos 1087: }
                   1088:
1.11      lukem    1089:
1.1       christos 1090: /*
                   1091:  * write history to a file given
                   1092:  */
                   1093: int
1.11      lukem    1094: write_history(const char *filename)
1.1       christos 1095: {
                   1096:        HistEvent ev;
                   1097:
                   1098:        if (h == NULL || e == NULL)
                   1099:                rl_initialize();
1.11      lukem    1100:        return (history(h, &ev, H_SAVE, filename));
1.1       christos 1101: }
                   1102:
1.11      lukem    1103:
1.1       christos 1104: /*
                   1105:  * returns history ``num''th event
                   1106:  *
                   1107:  * returned pointer points to static variable
                   1108:  */
1.2       christos 1109: HIST_ENTRY *
1.11      lukem    1110: history_get(int num)
1.1       christos 1111: {
                   1112:        static HIST_ENTRY she;
                   1113:        HistEvent ev;
1.40      christos 1114:        int curr_num;
1.1       christos 1115:
                   1116:        if (h == NULL || e == NULL)
                   1117:                rl_initialize();
                   1118:
1.40      christos 1119:        /* save current position */
1.1       christos 1120:        if (history(h, &ev, H_CURR) != 0)
1.11      lukem    1121:                return (NULL);
1.1       christos 1122:        curr_num = ev.num;
1.40      christos 1123:
                   1124:        /* start from most recent */
                   1125:        if (history(h, &ev, H_FIRST) != 0)
1.11      lukem    1126:                return (NULL);  /* error */
1.40      christos 1127:
                   1128:        /* look backwards for event matching specified offset */
                   1129:        if (history(h, &ev, H_NEXT_EVENT, num))
                   1130:                return (NULL);
1.1       christos 1131:
                   1132:        she.line = ev.str;
                   1133:        she.data = NULL;
                   1134:
1.40      christos 1135:        /* restore pointer to where it was */
                   1136:        (void)history(h, &ev, H_SET, curr_num);
1.1       christos 1137:
1.11      lukem    1138:        return (&she);
1.1       christos 1139: }
                   1140:
1.11      lukem    1141:
1.1       christos 1142: /*
                   1143:  * add the line to history table
                   1144:  */
                   1145: int
1.11      lukem    1146: add_history(const char *line)
1.1       christos 1147: {
                   1148:        HistEvent ev;
                   1149:
                   1150:        if (h == NULL || e == NULL)
                   1151:                rl_initialize();
                   1152:
1.40      christos 1153:        (void)history(h, &ev, H_ENTER, line);
1.1       christos 1154:        if (history(h, &ev, H_GETSIZE) == 0)
                   1155:                history_length = ev.num;
                   1156:
1.40      christos 1157:        return (!(history_length > 0)); /* return 0 if all is okay */
1.1       christos 1158: }
                   1159:
1.11      lukem    1160:
1.1       christos 1161: /*
                   1162:  * clear the history list - delete all entries
                   1163:  */
                   1164: void
1.11      lukem    1165: clear_history(void)
1.1       christos 1166: {
                   1167:        HistEvent ev;
1.11      lukem    1168:
1.1       christos 1169:        history(h, &ev, H_CLEAR);
                   1170: }
                   1171:
1.11      lukem    1172:
1.1       christos 1173: /*
                   1174:  * returns offset of the current history event
                   1175:  */
                   1176: int
1.11      lukem    1177: where_history(void)
1.1       christos 1178: {
                   1179:        HistEvent ev;
                   1180:        int curr_num, off;
                   1181:
                   1182:        if (history(h, &ev, H_CURR) != 0)
1.11      lukem    1183:                return (0);
1.1       christos 1184:        curr_num = ev.num;
                   1185:
                   1186:        history(h, &ev, H_FIRST);
                   1187:        off = 1;
                   1188:        while (ev.num != curr_num && history(h, &ev, H_NEXT) == 0)
                   1189:                off++;
                   1190:
1.11      lukem    1191:        return (off);
1.1       christos 1192: }
                   1193:
1.11      lukem    1194:
1.1       christos 1195: /*
                   1196:  * returns current history event or NULL if there is no such event
                   1197:  */
1.2       christos 1198: HIST_ENTRY *
1.11      lukem    1199: current_history(void)
1.1       christos 1200: {
1.11      lukem    1201:
                   1202:        return (_move_history(H_CURR));
1.1       christos 1203: }
                   1204:
1.11      lukem    1205:
1.1       christos 1206: /*
                   1207:  * returns total number of bytes history events' data are using
                   1208:  */
                   1209: int
1.11      lukem    1210: history_total_bytes(void)
1.1       christos 1211: {
                   1212:        HistEvent ev;
                   1213:        int curr_num, size;
                   1214:
                   1215:        if (history(h, &ev, H_CURR) != 0)
1.11      lukem    1216:                return (-1);
1.1       christos 1217:        curr_num = ev.num;
                   1218:
                   1219:        history(h, &ev, H_FIRST);
                   1220:        size = 0;
                   1221:        do
                   1222:                size += strlen(ev.str);
                   1223:        while (history(h, &ev, H_NEXT) == 0);
                   1224:
                   1225:        /* get to the same position as before */
                   1226:        history(h, &ev, H_PREV_EVENT, curr_num);
                   1227:
1.11      lukem    1228:        return (size);
1.1       christos 1229: }
                   1230:
1.11      lukem    1231:
1.1       christos 1232: /*
                   1233:  * sets the position in the history list to ``pos''
                   1234:  */
                   1235: int
1.11      lukem    1236: history_set_pos(int pos)
1.1       christos 1237: {
                   1238:        HistEvent ev;
1.40      christos 1239:        int curr_num;
1.1       christos 1240:
                   1241:        if (pos > history_length || pos < 0)
1.11      lukem    1242:                return (-1);
1.1       christos 1243:
                   1244:        history(h, &ev, H_CURR);
                   1245:        curr_num = ev.num;
                   1246:
1.40      christos 1247:        if (history(h, &ev, H_SET, pos)) {
                   1248:                history(h, &ev, H_SET, curr_num);
                   1249:                return(-1);
1.1       christos 1250:        }
1.11      lukem    1251:        return (0);
1.1       christos 1252: }
                   1253:
1.11      lukem    1254:
1.1       christos 1255: /*
                   1256:  * returns previous event in history and shifts pointer accordingly
                   1257:  */
1.2       christos 1258: HIST_ENTRY *
1.11      lukem    1259: previous_history(void)
1.1       christos 1260: {
1.11      lukem    1261:
                   1262:        return (_move_history(H_PREV));
1.1       christos 1263: }
                   1264:
1.11      lukem    1265:
1.1       christos 1266: /*
                   1267:  * returns next event in history and shifts pointer accordingly
                   1268:  */
1.2       christos 1269: HIST_ENTRY *
1.11      lukem    1270: next_history(void)
1.1       christos 1271: {
1.11      lukem    1272:
                   1273:        return (_move_history(H_NEXT));
1.1       christos 1274: }
                   1275:
1.11      lukem    1276:
1.1       christos 1277: /*
1.40      christos 1278:  * searches for first history event containing the str
1.1       christos 1279:  */
1.40      christos 1280: int
                   1281: history_search(const char *str, int direction)
1.11      lukem    1282: {
                   1283:        HistEvent ev;
                   1284:        const char *strp;
                   1285:        int curr_num;
1.1       christos 1286:
                   1287:        if (history(h, &ev, H_CURR) != 0)
1.11      lukem    1288:                return (-1);
1.1       christos 1289:        curr_num = ev.num;
                   1290:
                   1291:        for (;;) {
1.40      christos 1292:                if ((strp = strstr(ev.str, str)) != NULL)
1.1       christos 1293:                        return (int) (strp - ev.str);
1.40      christos 1294:                if (history(h, &ev, direction < 0 ? H_NEXT:H_PREV) != 0)
1.1       christos 1295:                        break;
                   1296:        }
1.40      christos 1297:        history(h, &ev, H_SET, curr_num);
1.11      lukem    1298:        return (-1);
1.1       christos 1299: }
                   1300:
1.11      lukem    1301:
1.1       christos 1302: /*
                   1303:  * searches for first history event beginning with str
                   1304:  */
                   1305: int
1.11      lukem    1306: history_search_prefix(const char *str, int direction)
1.1       christos 1307: {
1.40      christos 1308:        HistEvent ev;
1.11      lukem    1309:
1.40      christos 1310:        return (history(h, &ev, direction < 0? H_PREV_STR:H_NEXT_STR, str));
1.1       christos 1311: }
                   1312:
1.11      lukem    1313:
1.1       christos 1314: /*
                   1315:  * search for event in history containing str, starting at offset
                   1316:  * abs(pos); continue backward, if pos<0, forward otherwise
                   1317:  */
1.5       christos 1318: /* ARGSUSED */
1.1       christos 1319: int
1.40      christos 1320: history_search_pos(const char *str,
1.30      christos 1321:                   int direction __attribute__((__unused__)), int pos)
1.1       christos 1322: {
1.11      lukem    1323:        HistEvent ev;
                   1324:        int curr_num, off;
1.1       christos 1325:
                   1326:        off = (pos > 0) ? pos : -pos;
                   1327:        pos = (pos > 0) ? 1 : -1;
                   1328:
                   1329:        if (history(h, &ev, H_CURR) != 0)
1.11      lukem    1330:                return (-1);
1.1       christos 1331:        curr_num = ev.num;
                   1332:
                   1333:        if (history_set_pos(off) != 0 || history(h, &ev, H_CURR) != 0)
1.11      lukem    1334:                return (-1);
1.1       christos 1335:
                   1336:
                   1337:        for (;;) {
                   1338:                if (strstr(ev.str, str))
1.11      lukem    1339:                        return (off);
1.1       christos 1340:                if (history(h, &ev, (pos < 0) ? H_PREV : H_NEXT) != 0)
                   1341:                        break;
                   1342:        }
                   1343:
                   1344:        /* set "current" pointer back to previous state */
                   1345:        history(h, &ev, (pos < 0) ? H_NEXT_EVENT : H_PREV_EVENT, curr_num);
                   1346:
1.11      lukem    1347:        return (-1);
1.1       christos 1348: }
                   1349:
                   1350:
                   1351: /********************************/
1.40      christos 1352: /* completion functions */
1.1       christos 1353:
                   1354: /*
                   1355:  * a completion generator for usernames; returns _first_ username
                   1356:  * which starts with supplied text
                   1357:  * text contains a partial username preceded by random character
                   1358:  * (usually '~'); state is ignored
                   1359:  * it's callers responsibility to free returned value
                   1360:  */
1.11      lukem    1361: char *
                   1362: username_completion_function(const char *text, int state)
1.1       christos 1363: {
1.50      christos 1364:        struct passwd *pwd, pwres;
                   1365:        char pwbuf[1024];
1.1       christos 1366:
                   1367:        if (text[0] == '\0')
1.11      lukem    1368:                return (NULL);
1.1       christos 1369:
                   1370:        if (*text == '~')
                   1371:                text++;
                   1372:
                   1373:        if (state == 0)
                   1374:                setpwent();
                   1375:
1.50      christos 1376:        while (getpwent_r(&pwres, pwbuf, sizeof(pwbuf), &pwd) == 0
1.52      christos 1377:            && pwd != NULL && text[0] == pwd->pw_name[0]
1.11      lukem    1378:            && strcmp(text, pwd->pw_name) == 0);
1.1       christos 1379:
                   1380:        if (pwd == NULL) {
                   1381:                endpwent();
1.11      lukem    1382:                return (NULL);
1.1       christos 1383:        }
1.11      lukem    1384:        return (strdup(pwd->pw_name));
1.1       christos 1385: }
                   1386:
1.11      lukem    1387:
1.1       christos 1388: /*
1.46      christos 1389:  * el-compatible wrapper to send TSTP on ^Z
                   1390:  */
                   1391: /* ARGSUSED */
                   1392: static unsigned char
                   1393: _el_rl_tstp(EditLine *el __attribute__((__unused__)), int ch __attribute__((__unused__)))
                   1394: {
                   1395:        (void)kill(0, SIGTSTP);
                   1396:        return CC_NORM;
                   1397: }
1.11      lukem    1398:
1.1       christos 1399: /*
1.12      jdolecek 1400:  * Display list of strings in columnar format on readline's output stream.
                   1401:  * 'matches' is list of strings, 'len' is number of strings in 'matches',
                   1402:  * 'max' is maximum length of string in 'matches'.
                   1403:  */
                   1404: void
1.53      dsl      1405: rl_display_match_list(char **matches, int len, int max)
1.12      jdolecek 1406: {
                   1407:
1.53      dsl      1408:        fn_display_match_list(e, matches, len, max);
1.1       christos 1409: }
                   1410:
1.56    ! christos 1411: static const char *
        !          1412: /*ARGSUSED*/
        !          1413: _rl_completion_append_character_function(const char *dummy
        !          1414:     __attribute__((__unused__)))
        !          1415: {
        !          1416:        static char buf[2];
        !          1417:        buf[1] = rl_completion_append_character;
        !          1418:        return buf;
        !          1419: }
        !          1420:
1.11      lukem    1421:
1.1       christos 1422: /*
                   1423:  * complete word at current point
                   1424:  */
1.53      dsl      1425: /* ARGSUSED */
1.1       christos 1426: int
1.53      dsl      1427: rl_complete(int ignore __attribute__((__unused__)), int invoking_key)
1.1       christos 1428: {
                   1429:        if (h == NULL || e == NULL)
                   1430:                rl_initialize();
                   1431:
                   1432:        if (rl_inhibit_completion) {
1.47      christos 1433:                char arr[2];
                   1434:                arr[0] = (char)invoking_key;
                   1435:                arr[1] = '\0';
                   1436:                el_insertstr(e, arr);
1.11      lukem    1437:                return (CC_REFRESH);
1.53      dsl      1438:        }
                   1439:
                   1440:        /* Just look at how many global variables modify this operation! */
                   1441:        return fn_complete(e,
                   1442:            (CPFunction *)rl_completion_entry_function,
                   1443:            rl_attempted_completion_function,
                   1444:            rl_basic_word_break_characters, rl_special_prefixes,
1.56    ! christos 1445:            _rl_completion_append_character_function, rl_completion_query_items,
1.53      dsl      1446:            &rl_completion_type, &rl_attempted_completion_over,
                   1447:            &rl_point, &rl_end);
1.1       christos 1448: }
                   1449:
1.11      lukem    1450:
1.53      dsl      1451: /* ARGSUSED */
                   1452: static unsigned char
                   1453: _el_rl_complete(EditLine *el __attribute__((__unused__)), int ch)
                   1454: {
                   1455:        return (unsigned char)rl_complete(0, ch);
                   1456: }
                   1457:
1.1       christos 1458: /*
1.7       simonb   1459:  * misc other functions
1.1       christos 1460:  */
                   1461:
                   1462: /*
                   1463:  * bind key c to readline-type function func
                   1464:  */
                   1465: int
1.11      lukem    1466: rl_bind_key(int c, int func(int, int))
1.1       christos 1467: {
1.11      lukem    1468:        int retval = -1;
1.1       christos 1469:
                   1470:        if (h == NULL || e == NULL)
                   1471:                rl_initialize();
                   1472:
                   1473:        if (func == rl_insert) {
                   1474:                /* XXX notice there is no range checking of ``c'' */
                   1475:                e->el_map.key[c] = ED_INSERT;
                   1476:                retval = 0;
                   1477:        }
1.11      lukem    1478:        return (retval);
1.1       christos 1479: }
                   1480:
1.11      lukem    1481:
1.1       christos 1482: /*
                   1483:  * read one key from input - handles chars pushed back
                   1484:  * to input stream also
                   1485:  */
                   1486: int
1.11      lukem    1487: rl_read_key(void)
1.1       christos 1488: {
1.11      lukem    1489:        char fooarr[2 * sizeof(int)];
1.1       christos 1490:
                   1491:        if (e == NULL || h == NULL)
                   1492:                rl_initialize();
                   1493:
1.11      lukem    1494:        return (el_getc(e, fooarr));
1.1       christos 1495: }
                   1496:
1.11      lukem    1497:
1.1       christos 1498: /*
                   1499:  * reset the terminal
                   1500:  */
1.5       christos 1501: /* ARGSUSED */
1.1       christos 1502: void
1.30      christos 1503: rl_reset_terminal(const char *p __attribute__((__unused__)))
1.1       christos 1504: {
1.11      lukem    1505:
1.1       christos 1506:        if (h == NULL || e == NULL)
                   1507:                rl_initialize();
                   1508:        el_reset(e);
                   1509: }
                   1510:
1.11      lukem    1511:
1.1       christos 1512: /*
                   1513:  * insert character ``c'' back into input stream, ``count'' times
                   1514:  */
                   1515: int
1.11      lukem    1516: rl_insert(int count, int c)
1.1       christos 1517: {
1.11      lukem    1518:        char arr[2];
1.1       christos 1519:
                   1520:        if (h == NULL || e == NULL)
                   1521:                rl_initialize();
                   1522:
                   1523:        /* XXX - int -> char conversion can lose on multichars */
                   1524:        arr[0] = c;
                   1525:        arr[1] = '\0';
                   1526:
                   1527:        for (; count > 0; count--)
                   1528:                el_push(e, arr);
                   1529:
1.11      lukem    1530:        return (0);
1.35      christos 1531: }
                   1532:
                   1533: /*ARGSUSED*/
                   1534: int
                   1535: rl_newline(int count, int c)
                   1536: {
                   1537:        /*
                   1538:         * Readline-4.0 appears to ignore the args.
                   1539:         */
                   1540:        return rl_insert(1, '\n');
                   1541: }
                   1542:
                   1543: /*ARGSUSED*/
                   1544: static unsigned char
                   1545: rl_bind_wrapper(EditLine *el, unsigned char c)
                   1546: {
                   1547:        if (map[c] == NULL)
                   1548:            return CC_ERROR;
1.49      christos 1549:
                   1550:        _rl_update_pos();
                   1551:
1.35      christos 1552:        (*map[c])(NULL, c);
1.38      christos 1553:
                   1554:        /* If rl_done was set by the above call, deal with it here */
                   1555:        if (rl_done)
                   1556:                return CC_EOF;
                   1557:
1.35      christos 1558:        return CC_NORM;
                   1559: }
                   1560:
                   1561: int
                   1562: rl_add_defun(const char *name, Function *fun, int c)
                   1563: {
                   1564:        char dest[8];
                   1565:        if (c >= sizeof(map) / sizeof(map[0]) || c < 0)
                   1566:                return -1;
                   1567:        map[(unsigned char)c] = fun;
                   1568:        el_set(e, EL_ADDFN, name, name, rl_bind_wrapper);
1.37      christos 1569:        vis(dest, c, VIS_WHITE|VIS_NOSLASH, 0);
                   1570:        el_set(e, EL_BIND, dest, name);
1.35      christos 1571:        return 0;
                   1572: }
                   1573:
                   1574: void
                   1575: rl_callback_read_char()
                   1576: {
1.36      christos 1577:        int count = 0, done = 0;
1.35      christos 1578:        const char *buf = el_gets(e, &count);
                   1579:        char *wbuf;
                   1580:
                   1581:        if (buf == NULL || count-- <= 0)
                   1582:                return;
1.36      christos 1583:        if (count == 0 && buf[0] == CTRL('d'))
                   1584:                done = 1;
                   1585:        if (buf[count] == '\n' || buf[count] == '\r')
                   1586:                done = 2;
                   1587:
                   1588:        if (done && rl_linefunc != NULL) {
1.35      christos 1589:                el_set(e, EL_UNBUFFERED, 0);
1.36      christos 1590:                if (done == 2) {
                   1591:                    if ((wbuf = strdup(buf)) != NULL)
                   1592:                        wbuf[count] = '\0';
                   1593:                } else
                   1594:                        wbuf = NULL;
1.35      christos 1595:                (*(void (*)(const char *))rl_linefunc)(wbuf);
1.48      christos 1596:                el_set(e, EL_UNBUFFERED, 1);
1.35      christos 1597:        }
                   1598: }
                   1599:
                   1600: void
1.54      agc      1601: rl_callback_handler_install (const char *prompt, VCPFunction *linefunc)
1.35      christos 1602: {
                   1603:        if (e == NULL) {
                   1604:                rl_initialize();
                   1605:        }
                   1606:        if (rl_prompt)
                   1607:                free(rl_prompt);
                   1608:        rl_prompt = prompt ? strdup(strchr(prompt, *prompt)) : NULL;
                   1609:        rl_linefunc = linefunc;
                   1610:        el_set(e, EL_UNBUFFERED, 1);
                   1611: }
                   1612:
                   1613: void
                   1614: rl_callback_handler_remove(void)
                   1615: {
                   1616:        el_set(e, EL_UNBUFFERED, 0);
                   1617: }
                   1618:
                   1619: void
                   1620: rl_redisplay(void)
                   1621: {
                   1622:        char a[2];
                   1623:        a[0] = CTRL('r');
                   1624:        a[1] = '\0';
                   1625:        el_push(e, a);
                   1626: }
                   1627:
                   1628: int
                   1629: rl_get_previous_history(int count, int key)
                   1630: {
                   1631:        char a[2];
                   1632:        a[0] = key;
                   1633:        a[1] = '\0';
                   1634:        while (count--)
                   1635:                el_push(e, a);
                   1636:        return 0;
1.38      christos 1637: }
                   1638:
                   1639: void
                   1640: /*ARGSUSED*/
                   1641: rl_prep_terminal(int meta_flag)
                   1642: {
                   1643:        el_set(e, EL_PREP_TERM, 1);
                   1644: }
                   1645:
                   1646: void
                   1647: rl_deprep_terminal()
                   1648: {
                   1649:        el_set(e, EL_PREP_TERM, 0);
                   1650: }
                   1651:
                   1652: int
                   1653: rl_read_init_file(const char *s)
                   1654: {
                   1655:        return(el_source(e, s));
                   1656: }
                   1657:
                   1658: int
                   1659: rl_parse_and_bind(const char *line)
                   1660: {
                   1661:        const char **argv;
                   1662:        int argc;
                   1663:        Tokenizer *tok;
                   1664:
                   1665:        tok = tok_init(NULL);
1.44      lukem    1666:        tok_str(tok, line, &argc, &argv);
1.38      christos 1667:        argc = el_parse(e, argc, argv);
                   1668:        tok_end(tok);
                   1669:        return (argc ? 1 : 0);
                   1670: }
                   1671:
1.51      christos 1672: int
                   1673: rl_variable_bind(const char *var, const char *value)
                   1674: {
                   1675:        /*
                   1676:         * The proper return value is undocument, but this is what the
                   1677:         * readline source seems to do.
                   1678:         */
                   1679:        return ((el_set(e, EL_BIND, "", var, value) == -1) ? 1 : 0);
                   1680: }
                   1681:
1.38      christos 1682: void
                   1683: rl_stuff_char(int c)
                   1684: {
                   1685:        char buf[2];
                   1686:
                   1687:        buf[0] = c;
                   1688:        buf[1] = '\0';
                   1689:        el_insertstr(e, buf);
                   1690: }
                   1691:
                   1692: static int
                   1693: _rl_event_read_char(EditLine *el, char *cp)
                   1694: {
1.43      christos 1695:        int     n, num_read = 0;
1.38      christos 1696:
                   1697:        *cp = 0;
                   1698:        while (rl_event_hook) {
                   1699:
                   1700:                (*rl_event_hook)();
                   1701:
                   1702: #if defined(FIONREAD)
                   1703:                if (ioctl(el->el_infd, FIONREAD, &n) < 0)
                   1704:                        return(-1);
                   1705:                if (n)
                   1706:                        num_read = read(el->el_infd, cp, 1);
                   1707:                else
                   1708:                        num_read = 0;
                   1709: #elif defined(F_SETFL) && defined(O_NDELAY)
                   1710:                if ((n = fcntl(el->el_infd, F_GETFL, 0)) < 0)
                   1711:                        return(-1);
                   1712:                if (fcntl(el->el_infd, F_SETFL, n|O_NDELAY) < 0)
                   1713:                        return(-1);
                   1714:                num_read = read(el->el_infd, cp, 1);
                   1715:                if (fcntl(el->el_infd, F_SETFL, n))
                   1716:                        return(-1);
                   1717: #else
                   1718:                /* not non-blocking, but what you gonna do? */
                   1719:                num_read = read(el->el_infd, cp, 1);
                   1720:                return(-1);
                   1721: #endif
                   1722:
                   1723:                if (num_read < 0 && errno == EAGAIN)
                   1724:                        continue;
                   1725:                if (num_read == 0)
                   1726:                        continue;
                   1727:                break;
                   1728:        }
                   1729:        if (!rl_event_hook)
                   1730:                el_set(el, EL_GETCFN, EL_BUILTIN_GETCFN);
                   1731:        return(num_read);
1.1       christos 1732: }
1.49      christos 1733:
                   1734: static void
                   1735: _rl_update_pos(void)
                   1736: {
                   1737:        const LineInfo *li = el_line(e);
                   1738:
                   1739:        rl_point = li->cursor - li->buffer;
                   1740:        rl_end = li->lastchar - li->buffer;
                   1741: }

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