fstab.c revision 1.25
1 /* $NetBSD: fstab.c,v 1.25 2003/08/07 16:42:48 agc 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 1.25 2003/08/07 16:42:48 agc 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 int fstabscan __P((void)); 67 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; 77 78 _DIAGASSERT(str != NULL); 79 _DIAGASSERT(sep != NULL); 80 81 while ((ret = strsep(str, sep)) != NULL && *ret == '\0') 82 continue; 83 return ret; 84 } 85 86 87 static int 88 fstabscan() 89 { 90 char *cp, *lp, *sp; 91 #define MAXLINELENGTH 1024 92 static char line[MAXLINELENGTH]; 93 char subline[MAXLINELENGTH]; 94 static const char sep[] = ":\n"; 95 static const char ws[] = " \t\n"; 96 static char *fstab_type[] = { 97 FSTAB_RW, FSTAB_RQ, FSTAB_RO, FSTAB_SW, FSTAB_DP, FSTAB_XX, NULL 98 }; 99 100 (void)memset(&_fs_fstab, 0, sizeof(_fs_fstab)); 101 for (;;) { 102 if (!(lp = fgets(line, sizeof(line), _fs_fp))) 103 return 0; 104 _fs_lineno++; 105 /* OLD_STYLE_FSTAB */ 106 if (!strpbrk(lp, " \t")) { 107 _fs_fstab.fs_spec = nextfld(&lp, sep); 108 if (!_fs_fstab.fs_spec || *_fs_fstab.fs_spec == '#') 109 continue; 110 _fs_fstab.fs_file = nextfld(&lp, sep); 111 _fs_fstab.fs_type = nextfld(&lp, sep); 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 = 117 strcmp(_fs_fstab.fs_type, FSTAB_SW) ? 118 "ufs" : "swap"; 119 if ((cp = nextfld(&lp, sep)) != NULL) { 120 _fs_fstab.fs_freq = atoi(cp); 121 if ((cp = nextfld(&lp, sep)) != NULL) { 122 _fs_fstab.fs_passno = atoi(cp); 123 return 1; 124 } 125 } 126 } 127 goto bad; 128 } 129 /* OLD_STYLE_FSTAB */ 130 _fs_fstab.fs_spec = nextfld(&lp, ws); 131 if (!_fs_fstab.fs_spec || *_fs_fstab.fs_spec == '#') 132 continue; 133 _fs_fstab.fs_file = nextfld(&lp, ws); 134 _fs_fstab.fs_vfstype = nextfld(&lp, ws); 135 _fs_fstab.fs_mntops = nextfld(&lp, ws); 136 if (_fs_fstab.fs_mntops == NULL) 137 goto bad; 138 _fs_fstab.fs_freq = 0; 139 _fs_fstab.fs_passno = 0; 140 if ((cp = nextfld(&lp, ws)) != NULL) { 141 _fs_fstab.fs_freq = atoi(cp); 142 if ((cp = nextfld(&lp, ws)) != NULL) 143 _fs_fstab.fs_passno = atoi(cp); 144 } 145 146 /* subline truncated iff line truncated */ 147 (void)strlcpy(subline, _fs_fstab.fs_mntops, sizeof(subline)); 148 sp = subline; 149 150 while ((cp = nextfld(&sp, ",")) != NULL) { 151 char **tp; 152 153 if (strlen(cp) != 2) 154 continue; 155 156 for (tp = fstab_type; *tp; tp++) 157 if (strcmp(cp, *tp) == 0) { 158 _fs_fstab.fs_type = *tp; 159 break; 160 } 161 if (*tp) 162 break; 163 } 164 if (_fs_fstab.fs_type == NULL) 165 goto bad; 166 if (strcmp(_fs_fstab.fs_type, FSTAB_XX) == 0) 167 continue; 168 if (cp != NULL) 169 return 1; 170 171 bad: 172 warnx("%s, %lu: Missing fields", _fs_file, (u_long)_fs_lineno); 173 } 174 /* NOTREACHED */ 175 } 176 177 struct fstab * 178 getfsent() 179 { 180 if ((!_fs_fp && !setfsent()) || !fstabscan()) 181 return NULL; 182 return &_fs_fstab; 183 } 184 185 struct fstab * 186 getfsspec(name) 187 const char *name; 188 { 189 190 _DIAGASSERT(name != NULL); 191 192 if (setfsent()) 193 while (fstabscan()) 194 if (!strcmp(_fs_fstab.fs_spec, name)) 195 return &_fs_fstab; 196 return NULL; 197 } 198 199 struct fstab * 200 getfsfile(name) 201 const char *name; 202 { 203 204 _DIAGASSERT(name != NULL); 205 206 if (setfsent()) 207 while (fstabscan()) 208 if (!strcmp(_fs_fstab.fs_file, name)) 209 return &_fs_fstab; 210 return NULL; 211 } 212 213 int 214 setfsent() 215 { 216 _fs_lineno = 0; 217 if (_fs_fp) { 218 rewind(_fs_fp); 219 return 1; 220 } 221 if ((_fs_fp = fopen(_PATH_FSTAB, "r")) == NULL) { 222 warn("Cannot open `%s'", _PATH_FSTAB); 223 return 0; 224 } 225 return 1; 226 } 227 228 void 229 endfsent() 230 { 231 if (_fs_fp) { 232 (void)fclose(_fs_fp); 233 _fs_fp = NULL; 234 } 235 } 236
Indexes created Tue Sep 30 20:09:53 GMT 2025