1 /* $NetBSD: fstab.c,v 1.31 2012/03/13 21:13:34 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1980, 1988, 1993 5 * The Regents of the University of California. All rights reserved. 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. Neither the name of the University nor the names of its contributors 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 32 #include <sys/cdefs.h> 33 #if defined(LIBC_SCCS) && !defined(lint) 34 #if 0 35 static char sccsid[] = "@(#)fstab.c 8.1 (Berkeley) 6/4/93"; 36 #else 37 __RCSID("$NetBSD: fstab.c,v 1.31 2012/03/13 21:13:34 christos Exp $"); 38 #endif 39 #endif /* LIBC_SCCS and not lint */ 40 41 #include "namespace.h" 42 #include <sys/types.h> 43 44 #include <assert.h> 45 #include <err.h> 46 #include <errno.h> 47 #include <fstab.h> 48 #include <stdio.h> 49 #include <stdlib.h> 50 #include <string.h> 51 #include <unistd.h> 52 53 #ifdef __weak_alias 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) 59 #endif 60 61 static FILE *_fs_fp; 62 static size_t _fs_lineno = 0; 63 static const char *_fs_file = _PATH_FSTAB; 64 static struct fstab _fs_fstab; 65 66 static char *nextfld(char **, const char *); 67 static int fstabscan(void); 68 69 70 static char * 71 nextfld(char **str, const char *sep) 72 { 73 char *ret; 74 75 _DIAGASSERT(str != NULL); 76 _DIAGASSERT(sep != NULL); 77 78 while ((ret = stresep(str, sep, '\\')) != NULL && *ret == '\0') 79 continue; 80 return ret; 81 } 82 83 84 static int 85 fstabscan(void) 86 { 87 char *cp, *lp, *sp; 88 #define MAXLINELENGTH 1024 89 static char line[MAXLINELENGTH]; 90 char subline[MAXLINELENGTH]; 91 static const char sep[] = ":\n"; 92 static const char ws[] = " \t\n"; 93 static const char *fstab_type[] = { 94 FSTAB_RW, FSTAB_RQ, FSTAB_RO, FSTAB_SW, FSTAB_DP, FSTAB_XX, NULL 95 }; 96 97 (void)memset(&_fs_fstab, 0, sizeof(_fs_fstab)); 98 for (;;) { 99 if (!(lp = fgets(line, (int)sizeof(line), _fs_fp))) 100 return 0; 101 _fs_lineno++; 102 /* OLD_STYLE_FSTAB */ 103 if (!strpbrk(lp, " \t")) { 104 _fs_fstab.fs_spec = nextfld(&lp, sep); 105 if (!_fs_fstab.fs_spec || *_fs_fstab.fs_spec == '#') 106 continue; 107 _fs_fstab.fs_file = nextfld(&lp, sep); 108 _fs_fstab.fs_type = nextfld(&lp, sep); 109 if (_fs_fstab.fs_type) { 110 if (!strcmp(_fs_fstab.fs_type, FSTAB_XX)) 111 continue; 112 _fs_fstab.fs_mntops = _fs_fstab.fs_type; 113 _fs_fstab.fs_vfstype = 114 __UNCONST( 115 strcmp(_fs_fstab.fs_type, FSTAB_SW) ? 116 "ufs" : "swap"); 117 if ((cp = nextfld(&lp, sep)) != NULL) { 118 _fs_fstab.fs_freq = atoi(cp); 119 if ((cp = nextfld(&lp, sep)) != NULL) { 120 _fs_fstab.fs_passno = atoi(cp); 121 return 1; 122 } 123 } 124 } 125 goto bad; 126 } 127 /* OLD_STYLE_FSTAB */ 128 _fs_fstab.fs_spec = nextfld(&lp, ws); 129 if (!_fs_fstab.fs_spec || *_fs_fstab.fs_spec == '#') 130 continue; 131 _fs_fstab.fs_file = nextfld(&lp, ws); 132 _fs_fstab.fs_vfstype = nextfld(&lp, ws); 133 _fs_fstab.fs_mntops = nextfld(&lp, ws); 134 if (_fs_fstab.fs_mntops == NULL) 135 goto bad; 136 _fs_fstab.fs_freq = 0; 137 _fs_fstab.fs_passno = 0; 138 if ((cp = nextfld(&lp, ws)) != NULL) { 139 _fs_fstab.fs_freq = atoi(cp); 140 if ((cp = nextfld(&lp, ws)) != NULL) 141 _fs_fstab.fs_passno = atoi(cp); 142 } 143 144 /* subline truncated iff line truncated */ 145 (void)strlcpy(subline, _fs_fstab.fs_mntops, sizeof(subline)); 146 sp = subline; 147 148 while ((cp = nextfld(&sp, ",")) != NULL) { 149 const char **tp; 150 151 if (strlen(cp) != 2) 152 continue; 153 154 for (tp = fstab_type; *tp; tp++) 155 if (strcmp(cp, *tp) == 0) { 156 _fs_fstab.fs_type = __UNCONST(*tp); 157 break; 158 } 159 if (*tp) 160 break; 161 } 162 if (_fs_fstab.fs_type == NULL) 163 goto bad; 164 if (strcmp(_fs_fstab.fs_type, FSTAB_XX) == 0) 165 continue; 166 if (cp != NULL) 167 return 1; 168 169 bad: 170 warnx("%s, %lu: Missing fields", _fs_file, (u_long)_fs_lineno); 171 } 172 /* NOTREACHED */ 173 } 174 175 struct fstab * 176 getfsent(void) 177 { 178 if ((!_fs_fp && !setfsent()) || !fstabscan()) 179 return NULL; 180 return &_fs_fstab; 181 } 182 183 struct fstab * 184 getfsspec(const char *name) 185 { 186 187 _DIAGASSERT(name != NULL); 188 189 if (setfsent()) 190 while (fstabscan()) 191 if (!strcmp(_fs_fstab.fs_spec, name)) 192 return &_fs_fstab; 193 return NULL; 194 } 195 196 struct fstab * 197 getfsfile(const char *name) 198 { 199 200 _DIAGASSERT(name != NULL); 201 202 if (setfsent()) 203 while (fstabscan()) 204 if (!strcmp(_fs_fstab.fs_file, name)) 205 return &_fs_fstab; 206 return NULL; 207 } 208 209 int 210 setfsent(void) 211 { 212 _fs_lineno = 0; 213 if (_fs_fp) { 214 rewind(_fs_fp); 215 return 1; 216 } 217 if ((_fs_fp = fopen(_PATH_FSTAB, "re")) == NULL) { 218 warn("Cannot open `%s'", _PATH_FSTAB); 219 return 0; 220 } 221 return 1; 222 } 223 224 void 225 endfsent(void) 226 { 227 if (_fs_fp) { 228 (void)fclose(_fs_fp); 229 _fs_fp = NULL; 230 } 231 } 232
Indexes created Tue Sep 23 07:09:52 GMT 2025