fstab.c revision 1.21
1 /* $NetBSD: fstab.c,v 1.21 1999/09/20 04:38:59 lukem 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. 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 #include <sys/cdefs.h> 37 #if defined(LIBC_SCCS) && !defined(lint) 38 #if 0 39 static char sccsid[] = "@(#)fstab.c 8.1 (Berkeley) 6/4/93"; 40 #else 41 __RCSID("$NetBSD: fstab.c,v 1.21 1999/09/20 04:38:59 lukem Exp $"); 42 #endif 43 #endif /* LIBC_SCCS and not lint */ 44 45 #include "namespace.h" 46 #include <sys/types.h> 47 48 #include <assert.h> 49 #include <err.h> 50 #include <errno.h> 51 #include <fstab.h> 52 #include <stdio.h> 53 #include <stdlib.h> 54 #include <string.h> 55 #include <unistd.h> 56 57 #ifdef __weak_alias 58 __weak_alias(endfsent,_endfsent); 59 __weak_alias(getfsent,_getfsent); 60 __weak_alias(getfsfile,_getfsfile); 61 __weak_alias(getfsspec,_getfsspec); 62 __weak_alias(setfsent,_setfsent); 63 #endif 64 65 static FILE *_fs_fp; 66 static size_t _fs_lineno = 0; 67 static const char *_fs_file = _PATH_FSTAB; 68 static struct fstab _fs_fstab; 69 70 static int fstabscan __P((void)); 71 72 static __inline char *nextfld __P((char **, const char *)); 73 74 75 static __inline char * 76 nextfld(str, sep) 77 char **str; 78 const char *sep; 79 { 80 char *ret; 81 82 _DIAGASSERT(str != NULL); 83 _DIAGASSERT(sep != NULL); 84 85 while ((ret = strsep(str, sep)) != NULL && *ret == '\0') 86 continue; 87 return ret; 88 } 89 90 91 static int 92 fstabscan() 93 { 94 char *cp, *lp, *sp; 95 #define MAXLINELENGTH 1024 96 static char line[MAXLINELENGTH]; 97 char subline[MAXLINELENGTH]; 98 static const char sep[] = ":\n"; 99 static const char ws[] = " \t\n"; 100 static char *fstab_type[] = { 101 FSTAB_RW, FSTAB_RQ, FSTAB_RO, FSTAB_SW, FSTAB_DP, FSTAB_XX, NULL 102 }; 103 104 for (;;) { 105 if (!(lp = fgets(line, sizeof(line), _fs_fp))) 106 return 0; 107 _fs_lineno++; 108 /* OLD_STYLE_FSTAB */ 109 if (!strpbrk(lp, " \t")) { 110 _fs_fstab.fs_spec = nextfld(&lp, sep); 111 if (!_fs_fstab.fs_spec || *_fs_fstab.fs_spec == '#') 112 continue; 113 _fs_fstab.fs_file = nextfld(&lp, sep); 114 _fs_fstab.fs_type = nextfld(&lp, sep); 115 if (_fs_fstab.fs_type) { 116 if (!strcmp(_fs_fstab.fs_type, FSTAB_XX)) 117 continue; 118 _fs_fstab.fs_mntops = _fs_fstab.fs_type; 119 _fs_fstab.fs_vfstype = 120 strcmp(_fs_fstab.fs_type, FSTAB_SW) ? 121 "ufs" : "swap"; 122 if ((cp = nextfld(&lp, sep)) != NULL) { 123 _fs_fstab.fs_freq = atoi(cp); 124 if ((cp = nextfld(&lp, sep)) != NULL) { 125 _fs_fstab.fs_passno = atoi(cp); 126 return 1; 127 } 128 } 129 } 130 goto bad; 131 } 132 /* OLD_STYLE_FSTAB */ 133 _fs_fstab.fs_spec = nextfld(&lp, ws); 134 if (!_fs_fstab.fs_spec || *_fs_fstab.fs_spec == '#') 135 continue; 136 _fs_fstab.fs_file = nextfld(&lp, ws); 137 _fs_fstab.fs_vfstype = nextfld(&lp, ws); 138 _fs_fstab.fs_mntops = nextfld(&lp, ws); 139 if (_fs_fstab.fs_mntops == NULL) 140 goto bad; 141 _fs_fstab.fs_freq = 0; 142 _fs_fstab.fs_passno = 0; 143 if ((cp = nextfld(&lp, ws)) != NULL) { 144 _fs_fstab.fs_freq = atoi(cp); 145 if ((cp = nextfld(&lp, ws)) != NULL) 146 _fs_fstab.fs_passno = atoi(cp); 147 } 148 sp = strncpy(subline, _fs_fstab.fs_mntops, sizeof(subline)-1); 149 while ((cp = nextfld(&sp, ",")) != NULL) { 150 char **tp; 151 152 if (strlen(cp) != 2) 153 continue; 154 155 for (tp = fstab_type; *tp; tp++) 156 if (strcmp(cp, *tp) == 0) { 157 _fs_fstab.fs_type = *tp; 158 break; 159 } 160 if (*tp) 161 break; 162 } 163 if (strcmp(_fs_fstab.fs_type, FSTAB_XX) == 0) 164 continue; 165 if (cp != NULL) 166 return 1; 167 168 bad: 169 warnx("%s, %lu: Missing fields", _fs_file, (u_long)_fs_lineno); 170 } 171 /* NOTREACHED */ 172 } 173 174 struct fstab * 175 getfsent() 176 { 177 if ((!_fs_fp && !setfsent()) || !fstabscan()) 178 return NULL; 179 return &_fs_fstab; 180 } 181 182 struct fstab * 183 getfsspec(name) 184 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(name) 198 const char *name; 199 { 200 201 _DIAGASSERT(name != NULL); 202 203 if (setfsent()) 204 while (fstabscan()) 205 if (!strcmp(_fs_fstab.fs_file, name)) 206 return &_fs_fstab; 207 return NULL; 208 } 209 210 int 211 setfsent() 212 { 213 _fs_lineno = 0; 214 if (_fs_fp) { 215 rewind(_fs_fp); 216 return 1; 217 } 218 if ((_fs_fp = fopen(_PATH_FSTAB, "r")) == NULL) { 219 warn("Cannot open `%s'", _PATH_FSTAB); 220 return 0; 221 } 222 return 1; 223 } 224 225 void 226 endfsent() 227 { 228 if (_fs_fp) { 229 (void)fclose(_fs_fp); 230 _fs_fp = NULL; 231 } 232 } 233
Indexes created Tue Sep 30 20:09:53 GMT 2025