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Annotation of src/lib/libc/gen/fstab.c, Revision 1.1.1.1

1.1       cgd         1: /*
                      2:  * Copyright (c) 1980, 1988 Regents of the University of California.
                      3:  * All rights reserved.
                      4:  *
                      5:  * Redistribution and use in source and binary forms, with or without
                      6:  * modification, are permitted provided that the following conditions
                      7:  * are met:
                      8:  * 1. Redistributions of source code must retain the above copyright
                      9:  *    notice, this list of conditions and the following disclaimer.
                     10:  * 2. Redistributions in binary form must reproduce the above copyright
                     11:  *    notice, this list of conditions and the following disclaimer in the
                     12:  *    documentation and/or other materials provided with the distribution.
                     13:  * 3. All advertising materials mentioning features or use of this software
                     14:  *    must display the following acknowledgement:
                     15:  *     This product includes software developed by the University of
                     16:  *     California, Berkeley and its contributors.
                     17:  * 4. Neither the name of the University nor the names of its contributors
                     18:  *    may be used to endorse or promote products derived from this software
                     19:  *    without specific prior written permission.
                     20:  *
                     21:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     22:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     23:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     24:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     25:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     26:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     27:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     28:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     29:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     30:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     31:  * SUCH DAMAGE.
                     32:  */
                     33:
                     34: #if defined(LIBC_SCCS) && !defined(lint)
                     35: static char sccsid[] = "@(#)fstab.c    5.15 (Berkeley) 2/23/91";
                     36: #endif /* LIBC_SCCS and not lint */
                     37:
                     38: #include <sys/errno.h>
                     39: #include <fstab.h>
                     40: #include <unistd.h>
                     41: #include <stdio.h>
                     42: #include <stdlib.h>
                     43: #include <string.h>
                     44:
                     45: static FILE *_fs_fp;
                     46: static struct fstab _fs_fstab;
                     47: static error();
                     48:
                     49: static
                     50: fstabscan()
                     51: {
                     52:        register char *cp;
                     53: #define        MAXLINELENGTH   1024
                     54:        static char line[MAXLINELENGTH];
                     55:        char subline[MAXLINELENGTH];
                     56:        int typexx;
                     57:
                     58:        for (;;) {
                     59:                if (!(cp = fgets(line, sizeof(line), _fs_fp)))
                     60:                        return(0);
                     61: /* OLD_STYLE_FSTAB */
                     62:                if (!strpbrk(cp, " \t")) {
                     63:                        _fs_fstab.fs_spec = strtok(cp, ":\n");
                     64:                        _fs_fstab.fs_file = strtok((char *)NULL, ":\n");
                     65:                        _fs_fstab.fs_type = strtok((char *)NULL, ":\n");
                     66:                        if (_fs_fstab.fs_type) {
                     67:                                if (!strcmp(_fs_fstab.fs_type, FSTAB_XX))
                     68:                                        continue;
                     69:                                _fs_fstab.fs_mntops = _fs_fstab.fs_type;
                     70:                                _fs_fstab.fs_vfstype =
                     71:                                    strcmp(_fs_fstab.fs_type, FSTAB_SW) ?
                     72:                                    "ufs" : "swap";
                     73:                                if (cp = strtok((char *)NULL, ":\n")) {
                     74:                                        _fs_fstab.fs_freq = atoi(cp);
                     75:                                        if (cp = strtok((char *)NULL, ":\n")) {
                     76:                                                _fs_fstab.fs_passno = atoi(cp);
                     77:                                                return(1);
                     78:                                        }
                     79:                                }
                     80:                        }
                     81:                        goto bad;
                     82:                }
                     83: /* OLD_STYLE_FSTAB */
                     84:                _fs_fstab.fs_spec = strtok(cp, " \t\n");
                     85:                if (!_fs_fstab.fs_spec || *_fs_fstab.fs_spec == '#')
                     86:                        continue;
                     87:                _fs_fstab.fs_file = strtok((char *)NULL, " \t\n");
                     88:                _fs_fstab.fs_vfstype = strtok((char *)NULL, " \t\n");
                     89:                _fs_fstab.fs_mntops = strtok((char *)NULL, " \t\n");
                     90:                if (_fs_fstab.fs_mntops == NULL)
                     91:                        goto bad;
                     92:                _fs_fstab.fs_freq = 0;
                     93:                _fs_fstab.fs_passno = 0;
                     94:                if ((cp = strtok((char *)NULL, " \t\n")) != NULL) {
                     95:                        _fs_fstab.fs_freq = atoi(cp);
                     96:                        if ((cp = strtok((char *)NULL, " \t\n")) != NULL)
                     97:                                _fs_fstab.fs_passno = atoi(cp);
                     98:                }
                     99:                strcpy(subline, _fs_fstab.fs_mntops);
                    100:                for (typexx = 0, cp = strtok(subline, ","); cp;
                    101:                     cp = strtok((char *)NULL, ",")) {
                    102:                        if (strlen(cp) != 2)
                    103:                                continue;
                    104:                        if (!strcmp(cp, FSTAB_RW)) {
                    105:                                _fs_fstab.fs_type = FSTAB_RW;
                    106:                                break;
                    107:                        }
                    108:                        if (!strcmp(cp, FSTAB_RQ)) {
                    109:                                _fs_fstab.fs_type = FSTAB_RQ;
                    110:                                break;
                    111:                        }
                    112:                        if (!strcmp(cp, FSTAB_RO)) {
                    113:                                _fs_fstab.fs_type = FSTAB_RO;
                    114:                                break;
                    115:                        }
                    116:                        if (!strcmp(cp, FSTAB_SW)) {
                    117:                                _fs_fstab.fs_type = FSTAB_SW;
                    118:                                break;
                    119:                        }
                    120:                        if (!strcmp(cp, FSTAB_XX)) {
                    121:                                _fs_fstab.fs_type = FSTAB_XX;
                    122:                                typexx++;
                    123:                                break;
                    124:                        }
                    125:                }
                    126:                if (typexx)
                    127:                        continue;
                    128:                if (cp != NULL)
                    129:                        return(1);
                    130:
                    131: bad:           /* no way to distinguish between EOF and syntax error */
                    132:                error(EFTYPE);
                    133:        }
                    134:        /* NOTREACHED */
                    135: }
                    136:
                    137: struct fstab *
                    138: getfsent()
                    139: {
                    140:        if (!_fs_fp && !setfsent() || !fstabscan())
                    141:                return((struct fstab *)NULL);
                    142:        return(&_fs_fstab);
                    143: }
                    144:
                    145: struct fstab *
                    146: getfsspec(name)
                    147:        register const char *name;
                    148: {
                    149:        if (setfsent())
                    150:                while (fstabscan())
                    151:                        if (!strcmp(_fs_fstab.fs_spec, name))
                    152:                                return(&_fs_fstab);
                    153:        return((struct fstab *)NULL);
                    154: }
                    155:
                    156: struct fstab *
                    157: getfsfile(name)
                    158:        register const char *name;
                    159: {
                    160:        if (setfsent())
                    161:                while (fstabscan())
                    162:                        if (!strcmp(_fs_fstab.fs_file, name))
                    163:                                return(&_fs_fstab);
                    164:        return((struct fstab *)NULL);
                    165: }
                    166:
                    167: setfsent()
                    168: {
                    169:        if (_fs_fp) {
                    170:                rewind(_fs_fp);
                    171:                return(1);
                    172:        }
                    173:        if (_fs_fp = fopen(_PATH_FSTAB, "r"))
                    174:                return(1);
                    175:        error(errno);
                    176:        return(0);
                    177: }
                    178:
                    179: void
                    180: endfsent()
                    181: {
                    182:        if (_fs_fp) {
                    183:                (void)fclose(_fs_fp);
                    184:                _fs_fp = NULL;
                    185:        }
                    186: }
                    187:
                    188: static
                    189: error(err)
                    190:        int err;
                    191: {
                    192:        char *p;
                    193:
                    194:        (void)write(STDERR_FILENO, "fstab: ", 7);
                    195:        (void)write(STDERR_FILENO, _PATH_FSTAB, sizeof(_PATH_FSTAB) - 1);
                    196:        p = strerror(err);
                    197:        (void)write(STDERR_FILENO, p, strlen(p));
                    198:        (void)write(STDERR_FILENO, "\n", 1);
                    199: }

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