fstab.c revision 1.13
1 /* $NetBSD: fstab.c,v 1.13 1998/07/26 13:47:20 mycroft 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 1.13 1998/07/26 13:47:20 mycroft Exp $"); 42 #endif 43 #endif /* LIBC_SCCS and not lint */ 44 45 #include <sys/types.h> 46 #include <sys/uio.h> 47 #include <errno.h> 48 #include <fstab.h> 49 #include <stdio.h> 50 #include <stdlib.h> 51 #include <string.h> 52 #include <unistd.h> 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 61 62 static FILE *_fs_fp; 63 static struct fstab _fs_fstab; 64 65 static void error __P((int)); 66 static int fstabscan __P((void)); 67 68 static int 69 fstabscan() 70 { 71 char *cp; 72 #define MAXLINELENGTH 1024 73 static char line[MAXLINELENGTH]; 74 char subline[MAXLINELENGTH]; 75 int typexx; 76 static const char sep[] = ":\n"; 77 static const char ws[] = " \t\n"; 78 79 for (;;) { 80 if (!(cp = fgets(line, sizeof(line), _fs_fp))) 81 return(0); 82 /* OLD_STYLE_FSTAB */ 83 if (!strpbrk(cp, " \t")) { 84 _fs_fstab.fs_spec = strtok(cp, sep); 85 if (!_fs_fstab.fs_spec || *_fs_fstab.fs_spec == '#') 86 continue; 87 _fs_fstab.fs_file = strtok(NULL, sep); 88 _fs_fstab.fs_type = strtok(NULL, sep); 89 if (_fs_fstab.fs_type) { 90 if (!strcmp(_fs_fstab.fs_type, FSTAB_XX)) 91 continue; 92 _fs_fstab.fs_mntops = _fs_fstab.fs_type; 93 _fs_fstab.fs_vfstype = 94 strcmp(_fs_fstab.fs_type, FSTAB_SW) ? 95 "ufs" : "swap"; 96 if ((cp = strtok(NULL, sep)) != NULL) { 97 _fs_fstab.fs_freq = atoi(cp); 98 if ((cp = strtok(NULL, sep)) != NULL) { 99 _fs_fstab.fs_passno = atoi(cp); 100 return(1); 101 } 102 } 103 } 104 goto bad; 105 } 106 /* OLD_STYLE_FSTAB */ 107 _fs_fstab.fs_spec = strtok(cp, ws); 108 if (!_fs_fstab.fs_spec || *_fs_fstab.fs_spec == '#') 109 continue; 110 _fs_fstab.fs_file = strtok(NULL, ws); 111 _fs_fstab.fs_vfstype = strtok(NULL, ws); 112 _fs_fstab.fs_mntops = strtok(NULL, ws); 113 if (_fs_fstab.fs_mntops == NULL) 114 goto bad; 115 _fs_fstab.fs_freq = 0; 116 _fs_fstab.fs_passno = 0; 117 if ((cp = strtok(NULL, ws)) != NULL) { 118 _fs_fstab.fs_freq = atoi(cp); 119 if ((cp = strtok(NULL, ws)) != NULL) 120 _fs_fstab.fs_passno = atoi(cp); 121 } 122 (void)strncpy(subline, _fs_fstab.fs_mntops, sizeof(subline)-1); 123 for (typexx = 0, cp = strtok(subline, ","); cp; 124 cp = strtok((char *)NULL, ",")) { 125 if (strlen(cp) != 2) 126 continue; 127 if (!strcmp(cp, FSTAB_RW)) { 128 _fs_fstab.fs_type = FSTAB_RW; 129 break; 130 } 131 if (!strcmp(cp, FSTAB_RQ)) { 132 _fs_fstab.fs_type = FSTAB_RQ; 133 break; 134 } 135 if (!strcmp(cp, FSTAB_RO)) { 136 _fs_fstab.fs_type = FSTAB_RO; 137 break; 138 } 139 if (!strcmp(cp, FSTAB_SW)) { 140 _fs_fstab.fs_type = FSTAB_SW; 141 break; 142 } 143 if (!strcmp(cp, FSTAB_XX)) { 144 _fs_fstab.fs_type = FSTAB_XX; 145 typexx++; 146 break; 147 } 148 } 149 if (typexx) 150 continue; 151 if (cp != NULL) 152 return(1); 153 154 bad: /* no way to distinguish between EOF and syntax error */ 155 error(EFTYPE); 156 } 157 /* NOTREACHED */ 158 } 159 160 struct fstab * 161 getfsent() 162 { 163 if ((!_fs_fp && !setfsent()) || !fstabscan()) 164 return((struct fstab *)NULL); 165 return(&_fs_fstab); 166 } 167 168 struct fstab * 169 getfsspec(name) 170 const char *name; 171 { 172 if (setfsent()) 173 while (fstabscan()) 174 if (!strcmp(_fs_fstab.fs_spec, name)) 175 return(&_fs_fstab); 176 return((struct fstab *)NULL); 177 } 178 179 struct fstab * 180 getfsfile(name) 181 const char *name; 182 { 183 if (setfsent()) 184 while (fstabscan()) 185 if (!strcmp(_fs_fstab.fs_file, name)) 186 return(&_fs_fstab); 187 return((struct fstab *)NULL); 188 } 189 190 int 191 setfsent() 192 { 193 if (_fs_fp) { 194 rewind(_fs_fp); 195 return(1); 196 } 197 if ((_fs_fp = fopen(_PATH_FSTAB, "r")) != NULL) 198 return(1); 199 error(errno); 200 return(0); 201 } 202 203 void 204 endfsent() 205 { 206 if (_fs_fp) { 207 (void)fclose(_fs_fp); 208 _fs_fp = NULL; 209 } 210 } 211 212 static void 213 error(err) 214 int err; 215 { 216 struct iovec iov[5]; 217 218 iov[0].iov_base = "fstab: "; 219 iov[0].iov_len = 7; 220 iov[1].iov_base = _PATH_FSTAB; 221 iov[1].iov_len = sizeof(_PATH_FSTAB) - 1; 222 iov[2].iov_base = ": "; 223 iov[2].iov_len = 2; 224 iov[3].iov_base = (char *)strerror(err); 225 iov[3].iov_len = strlen(iov[3].iov_base); 226 iov[4].iov_base = "\n"; 227 iov[4].iov_len = 1; 228 (void)writev(STDERR_FILENO, iov, 5); 229 } 230
Indexes created Tue Sep 30 20:09:53 GMT 2025