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Annotation of src/lib/libc/gen/fstab.c, Revision 1.8.2.1

1.8.2.1 ! jtc         1: /*     $NetBSD: fstab.c,v 1.8 1996/04/03 19:48:56 jtc 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.
                     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:
                     36: #if defined(LIBC_SCCS) && !defined(lint)
1.6       cgd        37: #if 0
                     38: static char sccsid[] = "@(#)fstab.c    8.1 (Berkeley) 6/4/93";
                     39: #else
1.8.2.1 ! jtc        40: static char rcsid[] = "$NetBSD: fstab.c,v 1.8 1996/04/03 19:48:56 jtc Exp $";
1.6       cgd        41: #endif
1.1       cgd        42: #endif /* LIBC_SCCS and not lint */
                     43:
1.8.2.1 ! jtc        44: #include "namespace.h"
1.7       cgd        45: #include <sys/types.h>
                     46: #include <sys/uio.h>
1.6       cgd        47: #include <errno.h>
1.1       cgd        48: #include <fstab.h>
                     49: #include <stdio.h>
                     50: #include <stdlib.h>
                     51: #include <string.h>
1.6       cgd        52: #include <unistd.h>
1.8.2.1 ! jtc        53:
        !            54: #ifdef __weak_alias
        !            55: __weak_alias(endfsent,_endfsent);
        !            56: __weak_alias(getfsent,_getfsent);
        !            57: __weak_alias(getfsfile,_getfsfile);
        !            58: __weak_alias(getfsspec,_getfsspec);
        !            59: __weak_alias(setfsent,_setfsent);
        !            60: #endif
1.1       cgd        61:
                     62: static FILE *_fs_fp;
                     63: static struct fstab _fs_fstab;
1.6       cgd        64:
1.8       jtc        65: static void error __P((int));
                     66: static int fstabscan __P((void));
1.1       cgd        67:
1.8       jtc        68: static int
1.1       cgd        69: fstabscan()
                     70: {
                     71:        register char *cp;
                     72: #define        MAXLINELENGTH   1024
                     73:        static char line[MAXLINELENGTH];
                     74:        char subline[MAXLINELENGTH];
                     75:        int typexx;
                     76:
                     77:        for (;;) {
                     78:                if (!(cp = fgets(line, sizeof(line), _fs_fp)))
                     79:                        return(0);
                     80: /* OLD_STYLE_FSTAB */
                     81:                if (!strpbrk(cp, " \t")) {
                     82:                        _fs_fstab.fs_spec = strtok(cp, ":\n");
1.4       pk         83:                        if (!_fs_fstab.fs_spec || *_fs_fstab.fs_spec == '#')
                     84:                                continue;
1.1       cgd        85:                        _fs_fstab.fs_file = strtok((char *)NULL, ":\n");
                     86:                        _fs_fstab.fs_type = strtok((char *)NULL, ":\n");
                     87:                        if (_fs_fstab.fs_type) {
                     88:                                if (!strcmp(_fs_fstab.fs_type, FSTAB_XX))
                     89:                                        continue;
                     90:                                _fs_fstab.fs_mntops = _fs_fstab.fs_type;
                     91:                                _fs_fstab.fs_vfstype =
                     92:                                    strcmp(_fs_fstab.fs_type, FSTAB_SW) ?
                     93:                                    "ufs" : "swap";
                     94:                                if (cp = strtok((char *)NULL, ":\n")) {
                     95:                                        _fs_fstab.fs_freq = atoi(cp);
                     96:                                        if (cp = strtok((char *)NULL, ":\n")) {
                     97:                                                _fs_fstab.fs_passno = atoi(cp);
                     98:                                                return(1);
                     99:                                        }
                    100:                                }
                    101:                        }
                    102:                        goto bad;
                    103:                }
                    104: /* OLD_STYLE_FSTAB */
                    105:                _fs_fstab.fs_spec = strtok(cp, " \t\n");
                    106:                if (!_fs_fstab.fs_spec || *_fs_fstab.fs_spec == '#')
                    107:                        continue;
                    108:                _fs_fstab.fs_file = strtok((char *)NULL, " \t\n");
                    109:                _fs_fstab.fs_vfstype = strtok((char *)NULL, " \t\n");
                    110:                _fs_fstab.fs_mntops = strtok((char *)NULL, " \t\n");
                    111:                if (_fs_fstab.fs_mntops == NULL)
                    112:                        goto bad;
                    113:                _fs_fstab.fs_freq = 0;
                    114:                _fs_fstab.fs_passno = 0;
                    115:                if ((cp = strtok((char *)NULL, " \t\n")) != NULL) {
                    116:                        _fs_fstab.fs_freq = atoi(cp);
                    117:                        if ((cp = strtok((char *)NULL, " \t\n")) != NULL)
                    118:                                _fs_fstab.fs_passno = atoi(cp);
                    119:                }
                    120:                strcpy(subline, _fs_fstab.fs_mntops);
                    121:                for (typexx = 0, cp = strtok(subline, ","); cp;
                    122:                     cp = strtok((char *)NULL, ",")) {
                    123:                        if (strlen(cp) != 2)
                    124:                                continue;
                    125:                        if (!strcmp(cp, FSTAB_RW)) {
                    126:                                _fs_fstab.fs_type = FSTAB_RW;
                    127:                                break;
                    128:                        }
                    129:                        if (!strcmp(cp, FSTAB_RQ)) {
                    130:                                _fs_fstab.fs_type = FSTAB_RQ;
                    131:                                break;
                    132:                        }
                    133:                        if (!strcmp(cp, FSTAB_RO)) {
                    134:                                _fs_fstab.fs_type = FSTAB_RO;
                    135:                                break;
                    136:                        }
                    137:                        if (!strcmp(cp, FSTAB_SW)) {
                    138:                                _fs_fstab.fs_type = FSTAB_SW;
                    139:                                break;
                    140:                        }
                    141:                        if (!strcmp(cp, FSTAB_XX)) {
                    142:                                _fs_fstab.fs_type = FSTAB_XX;
                    143:                                typexx++;
                    144:                                break;
                    145:                        }
                    146:                }
                    147:                if (typexx)
                    148:                        continue;
                    149:                if (cp != NULL)
                    150:                        return(1);
                    151:
                    152: bad:           /* no way to distinguish between EOF and syntax error */
                    153:                error(EFTYPE);
                    154:        }
                    155:        /* NOTREACHED */
                    156: }
                    157:
                    158: struct fstab *
                    159: getfsent()
                    160: {
                    161:        if (!_fs_fp && !setfsent() || !fstabscan())
                    162:                return((struct fstab *)NULL);
                    163:        return(&_fs_fstab);
                    164: }
                    165:
                    166: struct fstab *
                    167: getfsspec(name)
                    168:        register const char *name;
                    169: {
                    170:        if (setfsent())
                    171:                while (fstabscan())
                    172:                        if (!strcmp(_fs_fstab.fs_spec, name))
                    173:                                return(&_fs_fstab);
                    174:        return((struct fstab *)NULL);
                    175: }
                    176:
                    177: struct fstab *
                    178: getfsfile(name)
                    179:        register const char *name;
                    180: {
                    181:        if (setfsent())
                    182:                while (fstabscan())
                    183:                        if (!strcmp(_fs_fstab.fs_file, name))
                    184:                                return(&_fs_fstab);
                    185:        return((struct fstab *)NULL);
                    186: }
                    187:
1.8       jtc       188: int
1.1       cgd       189: setfsent()
                    190: {
                    191:        if (_fs_fp) {
                    192:                rewind(_fs_fp);
                    193:                return(1);
                    194:        }
                    195:        if (_fs_fp = fopen(_PATH_FSTAB, "r"))
                    196:                return(1);
                    197:        error(errno);
                    198:        return(0);
                    199: }
                    200:
                    201: void
                    202: endfsent()
                    203: {
                    204:        if (_fs_fp) {
                    205:                (void)fclose(_fs_fp);
                    206:                _fs_fp = NULL;
                    207:        }
                    208: }
                    209:
1.8       jtc       210: static void
1.1       cgd       211: error(err)
                    212:        int err;
                    213: {
1.5       mycroft   214:        struct iovec iov[5];
1.1       cgd       215:
1.5       mycroft   216:        iov[0].iov_base = "fstab: ";
                    217:        iov[0].iov_len = 7;
                    218:        iov[1].iov_base = _PATH_FSTAB;
                    219:        iov[1].iov_len = sizeof(_PATH_FSTAB) - 1;
                    220:        iov[2].iov_base =  ": ";
                    221:        iov[2].iov_len = 2;
                    222:        iov[3].iov_base = strerror(err);
                    223:        iov[3].iov_len = strlen(iov[3].iov_base);
                    224:        iov[4].iov_base = "\n";
                    225:        iov[4].iov_len = 1;
                    226:        (void)writev(STDERR_FILENO, iov, 5);
1.1       cgd       227: }

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