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Annotation of src/lib/libc/gen/unvis.c, Revision 1.19.6.1

1.19.6.1! nathanw     1: /*     $NetBSD: unvis.c,v 1.19 2000/01/22 22:19:13 mycroft Exp $       */
1.4       cgd         2:
1.1       cgd         3: /*-
1.4       cgd         4:  * Copyright (c) 1989, 1993
                      5:  *     The Regents of the University of California.  All rights reserved.
1.1       cgd         6:  *
                      7:  * Redistribution and use in source and binary forms, with or without
                      8:  * modification, are permitted provided that the following conditions
                      9:  * are met:
                     10:  * 1. Redistributions of source code must retain the above copyright
                     11:  *    notice, this list of conditions and the following disclaimer.
                     12:  * 2. Redistributions in binary form must reproduce the above copyright
                     13:  *    notice, this list of conditions and the following disclaimer in the
                     14:  *    documentation and/or other materials provided with the distribution.
                     15:  * 3. All advertising materials mentioning features or use of this software
                     16:  *    must display the following acknowledgement:
                     17:  *     This product includes software developed by the University of
                     18:  *     California, Berkeley and its contributors.
                     19:  * 4. Neither the name of the University nor the names of its contributors
                     20:  *    may be used to endorse or promote products derived from this software
                     21:  *    without specific prior written permission.
                     22:  *
                     23:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     24:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     25:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     26:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     27:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     28:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     29:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     30:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     31:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     32:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     33:  * SUCH DAMAGE.
                     34:  */
                     35:
1.6       christos   36: #include <sys/cdefs.h>
1.1       cgd        37: #if defined(LIBC_SCCS) && !defined(lint)
1.4       cgd        38: #if 0
                     39: static char sccsid[] = "@(#)unvis.c    8.1 (Berkeley) 6/4/93";
                     40: #else
1.19.6.1! nathanw    41: __RCSID("$NetBSD: unvis.c,v 1.19 2000/01/22 22:19:13 mycroft Exp $");
1.4       cgd        42: #endif
1.1       cgd        43: #endif /* LIBC_SCCS and not lint */
                     44:
1.10      fvdl       45: #define __LIBC12_SOURCE__
                     46:
1.7       jtc        47: #include "namespace.h"
1.1       cgd        48: #include <sys/types.h>
1.15      lukem      49:
                     50: #include <assert.h>
1.1       cgd        51: #include <ctype.h>
1.15      lukem      52: #include <stdio.h>
1.1       cgd        53: #include <vis.h>
1.7       jtc        54:
                     55: #ifdef __weak_alias
1.19      mycroft    56: __weak_alias(strunvis,_strunvis)
                     57: __weak_alias(unvis,_unvis)
1.7       jtc        58: #endif
1.14      thorpej    59:
1.19.6.1! nathanw    60: #ifdef __warn_references
1.14      thorpej    61: __warn_references(unvis,
                     62:     "warning: reference to compatibility unvis(); include <vis.h> for correct reference")
1.19.6.1! nathanw    63: #endif
1.1       cgd        64:
1.19.6.1! nathanw    65: #if !HAVE_VIS_H
1.1       cgd        66: /*
                     67:  * decode driven by state machine
                     68:  */
                     69: #define        S_GROUND        0       /* haven't seen escape char */
                     70: #define        S_START         1       /* start decoding special sequence */
                     71: #define        S_META          2       /* metachar started (M) */
                     72: #define        S_META1         3       /* metachar more, regular char (-) */
                     73: #define        S_CTRL          4       /* control char started (^) */
                     74: #define        S_OCTAL2        5       /* octal digit 2 */
                     75: #define        S_OCTAL3        6       /* octal digit 3 */
                     76:
                     77: #define        isoctal(c)      (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7')
1.9       thorpej    78:
                     79: int
                     80: unvis(cp, c, astate, flag)
                     81:        char *cp;
1.13      christos   82:        int c;
1.9       thorpej    83:        int *astate, flag;
                     84: {
                     85:        return __unvis13(cp, (int)c, astate, flag);
                     86: }
                     87:
1.1       cgd        88: /*
                     89:  * unvis - decode characters previously encoded by vis
                     90:  */
                     91: int
1.9       thorpej    92: __unvis13(cp, c, astate, flag)
1.4       cgd        93:        char *cp;
1.8       christos   94:        int c;
1.5       cgd        95:        int *astate, flag;
1.1       cgd        96: {
                     97:
1.15      lukem      98:        _DIAGASSERT(cp != NULL);
                     99:        _DIAGASSERT(astate != NULL);
                    100:
1.1       cgd       101:        if (flag & UNVIS_END) {
                    102:                if (*astate == S_OCTAL2 || *astate == S_OCTAL3) {
                    103:                        *astate = S_GROUND;
                    104:                        return (UNVIS_VALID);
                    105:                }
                    106:                return (*astate == S_GROUND ? UNVIS_NOCHAR : UNVIS_SYNBAD);
                    107:        }
                    108:
                    109:        switch (*astate) {
                    110:
                    111:        case S_GROUND:
                    112:                *cp = 0;
                    113:                if (c == '\\') {
                    114:                        *astate = S_START;
                    115:                        return (0);
                    116:                }
                    117:                *cp = c;
                    118:                return (UNVIS_VALID);
                    119:
                    120:        case S_START:
                    121:                switch(c) {
                    122:                case '\\':
                    123:                        *cp = c;
                    124:                        *astate = S_GROUND;
                    125:                        return (UNVIS_VALID);
                    126:                case '0': case '1': case '2': case '3':
                    127:                case '4': case '5': case '6': case '7':
                    128:                        *cp = (c - '0');
                    129:                        *astate = S_OCTAL2;
                    130:                        return (0);
                    131:                case 'M':
1.13      christos  132:                        *cp = (char)0200;
1.1       cgd       133:                        *astate = S_META;
                    134:                        return (0);
                    135:                case '^':
                    136:                        *astate = S_CTRL;
                    137:                        return (0);
                    138:                case 'n':
                    139:                        *cp = '\n';
                    140:                        *astate = S_GROUND;
                    141:                        return (UNVIS_VALID);
                    142:                case 'r':
                    143:                        *cp = '\r';
                    144:                        *astate = S_GROUND;
                    145:                        return (UNVIS_VALID);
                    146:                case 'b':
                    147:                        *cp = '\b';
                    148:                        *astate = S_GROUND;
                    149:                        return (UNVIS_VALID);
                    150:                case 'a':
                    151:                        *cp = '\007';
                    152:                        *astate = S_GROUND;
                    153:                        return (UNVIS_VALID);
                    154:                case 'v':
                    155:                        *cp = '\v';
                    156:                        *astate = S_GROUND;
                    157:                        return (UNVIS_VALID);
                    158:                case 't':
                    159:                        *cp = '\t';
                    160:                        *astate = S_GROUND;
                    161:                        return (UNVIS_VALID);
                    162:                case 'f':
                    163:                        *cp = '\f';
                    164:                        *astate = S_GROUND;
                    165:                        return (UNVIS_VALID);
                    166:                case 's':
                    167:                        *cp = ' ';
                    168:                        *astate = S_GROUND;
                    169:                        return (UNVIS_VALID);
                    170:                case 'E':
                    171:                        *cp = '\033';
                    172:                        *astate = S_GROUND;
                    173:                        return (UNVIS_VALID);
                    174:                case '\n':
                    175:                        /*
                    176:                         * hidden newline
                    177:                         */
                    178:                        *astate = S_GROUND;
                    179:                        return (UNVIS_NOCHAR);
                    180:                case '$':
                    181:                        /*
                    182:                         * hidden marker
                    183:                         */
                    184:                        *astate = S_GROUND;
                    185:                        return (UNVIS_NOCHAR);
                    186:                }
1.18      wennmach  187:                *astate = S_GROUND;
                    188:                return (UNVIS_SYNBAD);
1.1       cgd       189:
                    190:        case S_META:
                    191:                if (c == '-')
                    192:                        *astate = S_META1;
                    193:                else if (c == '^')
                    194:                        *astate = S_CTRL;
                    195:                else {
                    196:                        *astate = S_GROUND;
                    197:                        return (UNVIS_SYNBAD);
                    198:                }
                    199:                return (0);
                    200:
                    201:        case S_META1:
                    202:                *astate = S_GROUND;
                    203:                *cp |= c;
                    204:                return (UNVIS_VALID);
                    205:
                    206:        case S_CTRL:
                    207:                if (c == '?')
                    208:                        *cp |= 0177;
                    209:                else
                    210:                        *cp |= c & 037;
                    211:                *astate = S_GROUND;
                    212:                return (UNVIS_VALID);
                    213:
                    214:        case S_OCTAL2:  /* second possible octal digit */
                    215:                if (isoctal(c)) {
                    216:                        /*
                    217:                         * yes - and maybe a third
                    218:                         */
                    219:                        *cp = (*cp << 3) + (c - '0');
                    220:                        *astate = S_OCTAL3;
                    221:                        return (0);
                    222:                }
                    223:                /*
                    224:                 * no - done with current sequence, push back passed char
                    225:                 */
                    226:                *astate = S_GROUND;
                    227:                return (UNVIS_VALIDPUSH);
                    228:
                    229:        case S_OCTAL3:  /* third possible octal digit */
                    230:                *astate = S_GROUND;
                    231:                if (isoctal(c)) {
                    232:                        *cp = (*cp << 3) + (c - '0');
                    233:                        return (UNVIS_VALID);
                    234:                }
                    235:                /*
                    236:                 * we were done, push back passed char
                    237:                 */
                    238:                return (UNVIS_VALIDPUSH);
                    239:
                    240:        default:
                    241:                /*
                    242:                 * decoder in unknown state - (probably uninitialized)
                    243:                 */
                    244:                *astate = S_GROUND;
                    245:                return (UNVIS_SYNBAD);
                    246:        }
                    247: }
                    248:
                    249: /*
                    250:  * strunvis - decode src into dst
                    251:  *
                    252:  *     Number of chars decoded into dst is returned, -1 on error.
                    253:  *     Dst is null terminated.
                    254:  */
                    255:
                    256: int
                    257: strunvis(dst, src)
1.12      perry     258:        char *dst;
                    259:        const char *src;
1.1       cgd       260: {
1.12      perry     261:        char c;
1.1       cgd       262:        char *start = dst;
                    263:        int state = 0;
1.15      lukem     264:
                    265:        _DIAGASSERT(src != NULL);
                    266:        _DIAGASSERT(dst != NULL);
1.1       cgd       267:
1.6       christos  268:        while ((c = *src++) != '\0') {
1.1       cgd       269:        again:
1.9       thorpej   270:                switch (__unvis13(dst, c, &state, 0)) {
1.1       cgd       271:                case UNVIS_VALID:
                    272:                        dst++;
                    273:                        break;
                    274:                case UNVIS_VALIDPUSH:
                    275:                        dst++;
                    276:                        goto again;
                    277:                case 0:
                    278:                case UNVIS_NOCHAR:
                    279:                        break;
                    280:                default:
                    281:                        return (-1);
                    282:                }
                    283:        }
1.9       thorpej   284:        if (__unvis13(dst, c, &state, UNVIS_END) == UNVIS_VALID)
1.1       cgd       285:                dst++;
                    286:        *dst = '\0';
                    287:        return (dst - start);
                    288: }
1.19.6.1! nathanw   289: #endif

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