fstab.c revision 1.17
1 /* $NetBSD: fstab.c,v 1.17 1999/01/24 19:51:16 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. 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 1.17 1999/01/24 19:51:16 christos Exp $"); 42 #endif 43 #endif /* LIBC_SCCS and not lint */ 44 45 #include "namespace.h" 46 #include <sys/types.h> 47 #include <err.h> 48 #include <errno.h> 49 #include <fstab.h> 50 #include <stdio.h> 51 #include <stdlib.h> 52 #include <string.h> 53 #include <unistd.h> 54 55 #ifdef __weak_alias 56 __weak_alias(endfsent,_endfsent); 57 __weak_alias(getfsent,_getfsent); 58 __weak_alias(getfsfile,_getfsfile); 59 __weak_alias(getfsspec,_getfsspec); 60 __weak_alias(setfsent,_setfsent); 61 #endif 62 63 static FILE *_fs_fp; 64 static size_t _fs_lineno = 0; 65 static const char *_fs_file = _PATH_FSTAB; 66 static struct fstab _fs_fstab; 67 68 static int fstabscan __P((void)); 69 70 static __inline char *nextfld __P((char **, const char *)); 71 72 73 static __inline char * 74 nextfld(str, sep) 75 char **str; 76 const char *sep; 77 { 78 char *ret; 79 while ((ret = strsep(str, sep)) != NULL && *ret == '\0') 80 continue; 81 return ret; 82 } 83 84 85 static int 86 fstabscan() 87 { 88 char *cp, *lp, *sp; 89 #define MAXLINELENGTH 1024 90 static char line[MAXLINELENGTH]; 91 char subline[MAXLINELENGTH]; 92 static const char sep[] = ":\n"; 93 static const char ws[] = " \t\n"; 94 static char *fstab_type[] = { 95 FSTAB_RW, FSTAB_RQ, FSTAB_RO, FSTAB_SW, FSTAB_XX, NULL 96 }; 97 98 for (;;) { 99 if (!(lp = fgets(line, 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 strcmp(_fs_fstab.fs_type, FSTAB_SW) ? 115 "ufs" : "swap"; 116 if ((cp = nextfld(&lp, sep)) != NULL) { 117 _fs_fstab.fs_freq = atoi(cp); 118 if ((cp = nextfld(&lp, sep)) != NULL) { 119 _fs_fstab.fs_passno = atoi(cp); 120 return 1; 121 } 122 } 123 } 124 goto bad; 125 } 126 /* OLD_STYLE_FSTAB */ 127 _fs_fstab.fs_spec = nextfld(&lp, ws); 128 if (!_fs_fstab.fs_spec || *_fs_fstab.fs_spec == '#') 129 continue; 130 _fs_fstab.fs_file = nextfld(&lp, ws); 131 _fs_fstab.fs_vfstype = nextfld(&lp, ws); 132 _fs_fstab.fs_mntops = nextfld(&lp, ws); 133 if (_fs_fstab.fs_mntops == NULL) 134 goto bad; 135 _fs_fstab.fs_freq = 0; 136 _fs_fstab.fs_passno = 0; 137 if ((cp = nextfld(&lp, ws)) != NULL) { 138 _fs_fstab.fs_freq = atoi(cp); 139 if ((cp = nextfld(&lp, ws)) != NULL) 140 _fs_fstab.fs_passno = atoi(cp); 141 } 142 sp = strncpy(subline, _fs_fstab.fs_mntops, sizeof(subline)-1); 143 while ((cp = nextfld(&sp, ",")) != NULL) { 144 char **tp; 145 146 if (strlen(cp) != 2) 147 continue; 148 149 for (tp = fstab_type; *tp; tp++) 150 if (strcmp(cp, *tp) == 0) { 151 _fs_fstab.fs_type = *tp; 152 break; 153 } 154 if (*tp) 155 break; 156 } 157 if (strcmp(_fs_fstab.fs_type, FSTAB_XX) == 0) 158 continue; 159 if (cp != NULL) 160 return 1; 161 162 bad: 163 warnx("%s, %d: Missing fields", _fs_file, _fs_lineno); 164 } 165 /* NOTREACHED */ 166 } 167 168 struct fstab * 169 getfsent() 170 { 171 if ((!_fs_fp && !setfsent()) || !fstabscan()) 172 return NULL; 173 return &_fs_fstab; 174 } 175 176 struct fstab * 177 getfsspec(name) 178 const char *name; 179 { 180 if (setfsent()) 181 while (fstabscan()) 182 if (!strcmp(_fs_fstab.fs_spec, name)) 183 return &_fs_fstab; 184 return NULL; 185 } 186 187 struct fstab * 188 getfsfile(name) 189 const char *name; 190 { 191 if (setfsent()) 192 while (fstabscan()) 193 if (!strcmp(_fs_fstab.fs_file, name)) 194 return &_fs_fstab; 195 return NULL; 196 } 197 198 int 199 setfsent() 200 { 201 _fs_lineno = 0; 202 if (_fs_fp) { 203 rewind(_fs_fp); 204 return 1; 205 } 206 if ((_fs_fp = fopen(_PATH_FSTAB, "r")) == NULL) { 207 warn("Cannot open `%s'", _PATH_FSTAB); 208 return 0; 209 } 210 return 1; 211 } 212 213 void 214 endfsent() 215 { 216 if (_fs_fp) { 217 (void)fclose(_fs_fp); 218 _fs_fp = NULL; 219 } 220 } 221
Indexes created Tue Sep 30 20:09:53 GMT 2025