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Annotation of src/lib/libc/gen/fstab.c, Revision 1.1.1.2

1.1       cgd         1: /*
1.1.1.2 ! cgd         2:  * Copyright (c) 1980, 1988, 1993
        !             3:  *     The Regents of the University of California.  All rights reserved.
1.1       cgd         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)
1.1.1.2 ! cgd        35: static char sccsid[] = "@(#)fstab.c    8.1 (Berkeley) 6/4/93";
1.1       cgd        36: #endif /* LIBC_SCCS and not lint */
                     37:
1.1.1.2 ! cgd        38: #include <errno.h>
1.1       cgd        39: #include <fstab.h>
                     40: #include <stdio.h>
                     41: #include <stdlib.h>
                     42: #include <string.h>
1.1.1.2 ! cgd        43: #include <unistd.h>
1.1       cgd        44:
                     45: static FILE *_fs_fp;
                     46: static struct fstab _fs_fstab;
1.1.1.2 ! cgd        47:
        !            48: static error __P((int));
        !            49: static fstabscan __P((void));
1.1       cgd        50:
                     51: static
                     52: fstabscan()
                     53: {
                     54:        register char *cp;
                     55: #define        MAXLINELENGTH   1024
                     56:        static char line[MAXLINELENGTH];
                     57:        char subline[MAXLINELENGTH];
                     58:        int typexx;
                     59:
                     60:        for (;;) {
                     61:                if (!(cp = fgets(line, sizeof(line), _fs_fp)))
                     62:                        return(0);
                     63: /* OLD_STYLE_FSTAB */
                     64:                if (!strpbrk(cp, " \t")) {
                     65:                        _fs_fstab.fs_spec = strtok(cp, ":\n");
                     66:                        _fs_fstab.fs_file = strtok((char *)NULL, ":\n");
                     67:                        _fs_fstab.fs_type = strtok((char *)NULL, ":\n");
                     68:                        if (_fs_fstab.fs_type) {
                     69:                                if (!strcmp(_fs_fstab.fs_type, FSTAB_XX))
                     70:                                        continue;
                     71:                                _fs_fstab.fs_mntops = _fs_fstab.fs_type;
                     72:                                _fs_fstab.fs_vfstype =
                     73:                                    strcmp(_fs_fstab.fs_type, FSTAB_SW) ?
                     74:                                    "ufs" : "swap";
                     75:                                if (cp = strtok((char *)NULL, ":\n")) {
                     76:                                        _fs_fstab.fs_freq = atoi(cp);
                     77:                                        if (cp = strtok((char *)NULL, ":\n")) {
                     78:                                                _fs_fstab.fs_passno = atoi(cp);
                     79:                                                return(1);
                     80:                                        }
                     81:                                }
                     82:                        }
                     83:                        goto bad;
                     84:                }
                     85: /* OLD_STYLE_FSTAB */
                     86:                _fs_fstab.fs_spec = strtok(cp, " \t\n");
                     87:                if (!_fs_fstab.fs_spec || *_fs_fstab.fs_spec == '#')
                     88:                        continue;
                     89:                _fs_fstab.fs_file = strtok((char *)NULL, " \t\n");
                     90:                _fs_fstab.fs_vfstype = strtok((char *)NULL, " \t\n");
                     91:                _fs_fstab.fs_mntops = strtok((char *)NULL, " \t\n");
                     92:                if (_fs_fstab.fs_mntops == NULL)
                     93:                        goto bad;
                     94:                _fs_fstab.fs_freq = 0;
                     95:                _fs_fstab.fs_passno = 0;
                     96:                if ((cp = strtok((char *)NULL, " \t\n")) != NULL) {
                     97:                        _fs_fstab.fs_freq = atoi(cp);
                     98:                        if ((cp = strtok((char *)NULL, " \t\n")) != NULL)
                     99:                                _fs_fstab.fs_passno = atoi(cp);
                    100:                }
                    101:                strcpy(subline, _fs_fstab.fs_mntops);
                    102:                for (typexx = 0, cp = strtok(subline, ","); cp;
                    103:                     cp = strtok((char *)NULL, ",")) {
                    104:                        if (strlen(cp) != 2)
                    105:                                continue;
                    106:                        if (!strcmp(cp, FSTAB_RW)) {
                    107:                                _fs_fstab.fs_type = FSTAB_RW;
                    108:                                break;
                    109:                        }
                    110:                        if (!strcmp(cp, FSTAB_RQ)) {
                    111:                                _fs_fstab.fs_type = FSTAB_RQ;
                    112:                                break;
                    113:                        }
                    114:                        if (!strcmp(cp, FSTAB_RO)) {
                    115:                                _fs_fstab.fs_type = FSTAB_RO;
                    116:                                break;
                    117:                        }
                    118:                        if (!strcmp(cp, FSTAB_SW)) {
                    119:                                _fs_fstab.fs_type = FSTAB_SW;
                    120:                                break;
                    121:                        }
                    122:                        if (!strcmp(cp, FSTAB_XX)) {
                    123:                                _fs_fstab.fs_type = FSTAB_XX;
                    124:                                typexx++;
                    125:                                break;
                    126:                        }
                    127:                }
                    128:                if (typexx)
                    129:                        continue;
                    130:                if (cp != NULL)
                    131:                        return(1);
                    132:
                    133: bad:           /* no way to distinguish between EOF and syntax error */
                    134:                error(EFTYPE);
                    135:        }
                    136:        /* NOTREACHED */
                    137: }
                    138:
                    139: struct fstab *
                    140: getfsent()
                    141: {
                    142:        if (!_fs_fp && !setfsent() || !fstabscan())
                    143:                return((struct fstab *)NULL);
                    144:        return(&_fs_fstab);
                    145: }
                    146:
                    147: struct fstab *
                    148: getfsspec(name)
                    149:        register const char *name;
                    150: {
                    151:        if (setfsent())
                    152:                while (fstabscan())
                    153:                        if (!strcmp(_fs_fstab.fs_spec, name))
                    154:                                return(&_fs_fstab);
                    155:        return((struct fstab *)NULL);
                    156: }
                    157:
                    158: struct fstab *
                    159: getfsfile(name)
                    160:        register const char *name;
                    161: {
                    162:        if (setfsent())
                    163:                while (fstabscan())
                    164:                        if (!strcmp(_fs_fstab.fs_file, name))
                    165:                                return(&_fs_fstab);
                    166:        return((struct fstab *)NULL);
                    167: }
                    168:
                    169: setfsent()
                    170: {
                    171:        if (_fs_fp) {
                    172:                rewind(_fs_fp);
                    173:                return(1);
                    174:        }
                    175:        if (_fs_fp = fopen(_PATH_FSTAB, "r"))
                    176:                return(1);
                    177:        error(errno);
                    178:        return(0);
                    179: }
                    180:
                    181: void
                    182: endfsent()
                    183: {
                    184:        if (_fs_fp) {
                    185:                (void)fclose(_fs_fp);
                    186:                _fs_fp = NULL;
                    187:        }
                    188: }
                    189:
                    190: static
                    191: error(err)
                    192:        int err;
                    193: {
                    194:        char *p;
                    195:
                    196:        (void)write(STDERR_FILENO, "fstab: ", 7);
                    197:        (void)write(STDERR_FILENO, _PATH_FSTAB, sizeof(_PATH_FSTAB) - 1);
1.1.1.2 ! cgd       198:        (void)write(STDERR_FILENO, ": ", 1);
1.1       cgd       199:        p = strerror(err);
                    200:        (void)write(STDERR_FILENO, p, strlen(p));
                    201:        (void)write(STDERR_FILENO, "\n", 1);
                    202: }

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