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Annotation of src/lib/libc/gen/fstab.c, Revision 1.26

1.26    ! christos    1: /*     $NetBSD: fstab.c,v 1.25 2003/08/07 16:42:48 agc Exp $   */
1.6       cgd         2:
1.1       cgd         3: /*
1.6       cgd         4:  * Copyright (c) 1980, 1988, 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.
1.25      agc        15:  * 3. Neither the name of the University nor the names of its contributors
1.1       cgd        16:  *    may be used to endorse or promote products derived from this software
                     17:  *    without specific prior written permission.
                     18:  *
                     19:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     20:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     21:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     22:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     23:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     24:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     25:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     26:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     27:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     28:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     29:  * SUCH DAMAGE.
                     30:  */
                     31:
1.10      christos   32: #include <sys/cdefs.h>
1.1       cgd        33: #if defined(LIBC_SCCS) && !defined(lint)
1.6       cgd        34: #if 0
                     35: static char sccsid[] = "@(#)fstab.c    8.1 (Berkeley) 6/4/93";
                     36: #else
1.26    ! christos   37: __RCSID("$NetBSD: fstab.c,v 1.25 2003/08/07 16:42:48 agc Exp $");
1.6       cgd        38: #endif
1.1       cgd        39: #endif /* LIBC_SCCS and not lint */
                     40:
1.15      kleink     41: #include "namespace.h"
1.7       cgd        42: #include <sys/types.h>
1.20      lukem      43:
                     44: #include <assert.h>
1.14      mycroft    45: #include <err.h>
1.6       cgd        46: #include <errno.h>
1.1       cgd        47: #include <fstab.h>
                     48: #include <stdio.h>
                     49: #include <stdlib.h>
                     50: #include <string.h>
1.6       cgd        51: #include <unistd.h>
1.11      jtc        52:
                     53: #ifdef __weak_alias
1.22      mycroft    54: __weak_alias(endfsent,_endfsent)
                     55: __weak_alias(getfsent,_getfsent)
                     56: __weak_alias(getfsfile,_getfsfile)
                     57: __weak_alias(getfsspec,_getfsspec)
                     58: __weak_alias(setfsent,_setfsent)
1.11      jtc        59: #endif
1.1       cgd        60:
                     61: static FILE *_fs_fp;
1.17      christos   62: static size_t _fs_lineno = 0;
                     63: static const char *_fs_file = _PATH_FSTAB;
1.1       cgd        64: static struct fstab _fs_fstab;
1.6       cgd        65:
1.8       jtc        66: static int fstabscan __P((void));
1.1       cgd        67:
1.17      christos   68: static __inline char *nextfld __P((char **, const char *));
                     69:
                     70:
                     71: static __inline char *
                     72: nextfld(str, sep)
                     73:        char **str;
                     74:        const char *sep;
                     75: {
                     76:        char *ret;
1.20      lukem      77:
                     78:        _DIAGASSERT(str != NULL);
                     79:        _DIAGASSERT(sep != NULL);
                     80:
1.17      christos   81:        while ((ret = strsep(str, sep)) != NULL && *ret == '\0')
                     82:                continue;
                     83:        return ret;
                     84: }
                     85:
                     86:
1.8       jtc        87: static int
1.1       cgd        88: fstabscan()
                     89: {
1.17      christos   90:        char *cp, *lp, *sp;
1.1       cgd        91: #define        MAXLINELENGTH   1024
                     92:        static char line[MAXLINELENGTH];
                     93:        char subline[MAXLINELENGTH];
1.10      christos   94:        static const char sep[] = ":\n";
                     95:        static const char ws[] = " \t\n";
1.26    ! christos   96:        static const char *fstab_type[] = {
1.19      mrg        97:            FSTAB_RW, FSTAB_RQ, FSTAB_RO, FSTAB_SW, FSTAB_DP, FSTAB_XX, NULL
1.17      christos   98:        };
1.1       cgd        99:
1.23      lukem     100:        (void)memset(&_fs_fstab, 0, sizeof(_fs_fstab));
1.1       cgd       101:        for (;;) {
1.17      christos  102:                if (!(lp = fgets(line, sizeof(line), _fs_fp)))
                    103:                        return 0;
                    104:                _fs_lineno++;
1.1       cgd       105: /* OLD_STYLE_FSTAB */
1.17      christos  106:                if (!strpbrk(lp, " \t")) {
                    107:                        _fs_fstab.fs_spec = nextfld(&lp, sep);
1.4       pk        108:                        if (!_fs_fstab.fs_spec || *_fs_fstab.fs_spec == '#')
                    109:                                continue;
1.17      christos  110:                        _fs_fstab.fs_file = nextfld(&lp, sep);
                    111:                        _fs_fstab.fs_type = nextfld(&lp, sep);
1.1       cgd       112:                        if (_fs_fstab.fs_type) {
                    113:                                if (!strcmp(_fs_fstab.fs_type, FSTAB_XX))
                    114:                                        continue;
                    115:                                _fs_fstab.fs_mntops = _fs_fstab.fs_type;
                    116:                                _fs_fstab.fs_vfstype =
1.26    ! christos  117:                                    __UNCONST(
1.1       cgd       118:                                    strcmp(_fs_fstab.fs_type, FSTAB_SW) ?
1.26    ! christos  119:                                    "ufs" : "swap");
1.17      christos  120:                                if ((cp = nextfld(&lp, sep)) != NULL) {
1.1       cgd       121:                                        _fs_fstab.fs_freq = atoi(cp);
1.17      christos  122:                                        if ((cp = nextfld(&lp, sep)) != NULL) {
1.1       cgd       123:                                                _fs_fstab.fs_passno = atoi(cp);
1.17      christos  124:                                                return 1;
1.1       cgd       125:                                        }
                    126:                                }
                    127:                        }
                    128:                        goto bad;
                    129:                }
                    130: /* OLD_STYLE_FSTAB */
1.17      christos  131:                _fs_fstab.fs_spec = nextfld(&lp, ws);
1.1       cgd       132:                if (!_fs_fstab.fs_spec || *_fs_fstab.fs_spec == '#')
                    133:                        continue;
1.17      christos  134:                _fs_fstab.fs_file = nextfld(&lp, ws);
                    135:                _fs_fstab.fs_vfstype = nextfld(&lp, ws);
                    136:                _fs_fstab.fs_mntops = nextfld(&lp, ws);
1.1       cgd       137:                if (_fs_fstab.fs_mntops == NULL)
                    138:                        goto bad;
                    139:                _fs_fstab.fs_freq = 0;
                    140:                _fs_fstab.fs_passno = 0;
1.17      christos  141:                if ((cp = nextfld(&lp, ws)) != NULL) {
1.1       cgd       142:                        _fs_fstab.fs_freq = atoi(cp);
1.17      christos  143:                        if ((cp = nextfld(&lp, ws)) != NULL)
1.1       cgd       144:                                _fs_fstab.fs_passno = atoi(cp);
                    145:                }
1.24      groo      146:
                    147:                /* subline truncated iff line truncated */
                    148:                (void)strlcpy(subline, _fs_fstab.fs_mntops, sizeof(subline));
                    149:                sp = subline;
                    150:
1.17      christos  151:                while ((cp = nextfld(&sp, ",")) != NULL) {
1.26    ! christos  152:                        const char **tp;
1.17      christos  153:
1.1       cgd       154:                        if (strlen(cp) != 2)
                    155:                                continue;
1.17      christos  156:
                    157:                        for (tp = fstab_type; *tp; tp++)
                    158:                                if (strcmp(cp, *tp) == 0) {
1.26    ! christos  159:                                        _fs_fstab.fs_type = __UNCONST(*tp);
1.17      christos  160:                                        break;
                    161:                                }
                    162:                        if (*tp)
1.1       cgd       163:                                break;
                    164:                }
1.23      lukem     165:                if (_fs_fstab.fs_type == NULL)
                    166:                        goto bad;
1.17      christos  167:                if (strcmp(_fs_fstab.fs_type, FSTAB_XX) == 0)
1.1       cgd       168:                        continue;
                    169:                if (cp != NULL)
1.17      christos  170:                        return 1;
1.1       cgd       171:
1.17      christos  172: bad:
1.18      thorpej   173:                warnx("%s, %lu: Missing fields", _fs_file, (u_long)_fs_lineno);
1.1       cgd       174:        }
                    175:        /* NOTREACHED */
                    176: }
                    177:
                    178: struct fstab *
                    179: getfsent()
                    180: {
1.10      christos  181:        if ((!_fs_fp && !setfsent()) || !fstabscan())
1.17      christos  182:                return NULL;
                    183:        return &_fs_fstab;
1.1       cgd       184: }
                    185:
                    186: struct fstab *
                    187: getfsspec(name)
1.12      perry     188:        const char *name;
1.1       cgd       189: {
1.20      lukem     190:
                    191:        _DIAGASSERT(name != NULL);
                    192:
1.1       cgd       193:        if (setfsent())
                    194:                while (fstabscan())
                    195:                        if (!strcmp(_fs_fstab.fs_spec, name))
1.17      christos  196:                                return &_fs_fstab;
                    197:        return NULL;
1.1       cgd       198: }
                    199:
                    200: struct fstab *
                    201: getfsfile(name)
1.12      perry     202:        const char *name;
1.1       cgd       203: {
1.20      lukem     204:
                    205:        _DIAGASSERT(name != NULL);
                    206:
1.1       cgd       207:        if (setfsent())
                    208:                while (fstabscan())
                    209:                        if (!strcmp(_fs_fstab.fs_file, name))
1.17      christos  210:                                return &_fs_fstab;
                    211:        return NULL;
1.1       cgd       212: }
                    213:
1.8       jtc       214: int
1.1       cgd       215: setfsent()
                    216: {
1.17      christos  217:        _fs_lineno = 0;
1.1       cgd       218:        if (_fs_fp) {
                    219:                rewind(_fs_fp);
1.17      christos  220:                return 1;
1.1       cgd       221:        }
1.17      christos  222:        if ((_fs_fp = fopen(_PATH_FSTAB, "r")) == NULL) {
                    223:                warn("Cannot open `%s'", _PATH_FSTAB);
                    224:                return 0;
                    225:        }
                    226:        return 1;
1.1       cgd       227: }
                    228:
                    229: void
                    230: endfsent()
                    231: {
                    232:        if (_fs_fp) {
                    233:                (void)fclose(_fs_fp);
                    234:                _fs_fp = NULL;
                    235:        }
                    236: }

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