1 /* $OpenBSD: diff.c,v 1.18 2003/06/27 17:08:45 david Exp $ */ 2 3 /* 4 * Copyright (C) Caldera International Inc. 2001-2002. 5 * 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 and documentation must retain the above 11 * copyright 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 or owned by Caldera 18 * International, Inc. 19 * 4. Neither the name of Caldera International, Inc. nor the names of other 20 * contributors may be used to endorse or promote products derived from 21 * this software without specific prior written permission. 22 * 23 * USE OF THE SOFTWARE PROVIDED FOR UNDER THIS LICENSE BY CALDERA 24 * INTERNATIONAL, INC. AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR 25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 27 * IN NO EVENT SHALL CALDERA INTERNATIONAL, INC. BE LIABLE FOR ANY DIRECT, 28 * INDIRECT INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 29 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 30 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 32 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 33 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 34 * POSSIBILITY OF SUCH DAMAGE. 35 */ 36 37 #include <errno.h> 38 #include <stdlib.h> 39 #include <stdarg.h> 40 #include <string.h> 41 #include <unistd.h> 42 43 #include "diff.h" 44 #include "pathnames.h" 45 46 #if 0 47 static char const sccsid[] = "@(#)diff.c 4.7 5/11/89"; 48 #endif 49 50 /* 51 * diff - driver and subroutines 52 */ 53 int opt; 54 int aflag; /* treat all files as text */ 55 int tflag; /* expand tabs on output */ 56 /* Algorithm related options. */ 57 int hflag; /* -h, use halfhearted DIFFH */ 58 int bflag; /* ignore blanks in comparisons */ 59 int wflag; /* totally ignore blanks in comparisons */ 60 int iflag; /* ignore case in comparisons */ 61 /* Options on hierarchical diffs. */ 62 int lflag; /* long output format with header */ 63 int rflag; /* recursively trace directories */ 64 int sflag; /* announce files which are same */ 65 char *start; /* do file only if name >= this */ 66 /* Variables for -D D_IFDEF option. */ 67 char *ifdefname; /* What we will print for #ifdef/#endif */ 68 int inifdef; 69 /* Variables for -c and -u context option. */ 70 int context; /* lines of context to be printed */ 71 /* State for exit status. */ 72 int status; 73 int anychange; 74 char *tempfile; /* used when comparing against std input */ 75 /* Variables for diffdir. */ 76 char **diffargv; /* option list to pass to recursive diffs */ 77 78 /* 79 * Input file names. 80 * With diffdir, file1 and file2 are allocated BUFSIZ space, 81 * and padded with a '/', and then efile0 and efile1 point after 82 * the '/'. 83 */ 84 char *file1, *file2, *efile1, *efile2; 85 struct stat stb1, stb2; 86 87 const char *diff = _PATH_DIFF; 88 const char *diffh = _PATH_DIFFH; 89 const char *pr = _PATH_PR; 90 91 __dead void usage(void); 92 93 int 94 main(int argc, char **argv) 95 { 96 int ch; 97 98 status = 2; 99 diffargv = argv; 100 101 while ((ch = getopt(argc, argv, "abC:cD:efhilnrS:stU:uw")) != -1) { 102 switch (ch) { 103 case 'a': 104 aflag++; 105 break; 106 case 'b': 107 bflag++; 108 break; 109 case 'C': 110 opt = D_CONTEXT; 111 if (!isdigit(*optarg)) 112 usage(); 113 context = atoi(optarg); /* XXX - use strtol */ 114 break; 115 case 'c': 116 opt = D_CONTEXT; 117 context = 3; 118 break; 119 case 'D': 120 opt = D_IFDEF; 121 ifdefname = optarg; 122 break; 123 case 'e': 124 opt = D_EDIT; 125 break; 126 case 'f': 127 opt = D_REVERSE; 128 break; 129 case 'h': 130 hflag++; 131 break; 132 case 'i': 133 iflag++; 134 break; 135 case 'l': 136 lflag++; 137 break; 138 case 'n': 139 opt = D_NREVERSE; 140 break; 141 case 'r': 142 rflag++; 143 break; 144 case 'S': 145 start = optarg; 146 break; 147 case 's': 148 sflag++; 149 break; 150 case 't': 151 tflag++; 152 break; 153 case 'U': 154 opt = D_UNIFIED; 155 if (!isdigit(*optarg)) 156 usage(); 157 context = atoi(optarg); /* XXX - use strtol */ 158 break; 159 case 'u': 160 opt = D_UNIFIED; 161 context = 3; 162 break; 163 case 'w': 164 wflag++; 165 break; 166 default: 167 usage(); 168 break; 169 } 170 } 171 argc -= optind; 172 argv += optind; 173 174 if (argc != 2) 175 errorx("two filename arguments required"); 176 file1 = argv[0]; 177 file2 = argv[1]; 178 if (hflag && opt) 179 errorx("-h doesn't support -D, -c, -C, -e, -f, -I, -n, -u or -U"); 180 if (!strcmp(file1, "-")) 181 stb1.st_mode = S_IFREG; 182 else if (stat(file1, &stb1) < 0) 183 error("%s", file1); 184 if (!strcmp(file2, "-")) 185 stb2.st_mode = S_IFREG; 186 else if (stat(file2, &stb2) < 0) 187 error("%s", file2); 188 if (S_ISDIR(stb1.st_mode) && S_ISDIR(stb2.st_mode)) 189 diffdir(argv); 190 else 191 diffreg(); 192 done(0); 193 } 194 195 int 196 min(int a, int b) 197 { 198 199 return (a < b ? a : b); 200 } 201 202 int 203 max(int a, int b) 204 { 205 206 return (a > b ? a : b); 207 } 208 209 __dead void 210 done(int sig) 211 { 212 if (tempfiles[0] != NULL) 213 unlink(tempfiles[0]); 214 if (tempfiles[1] != NULL) 215 unlink(tempfiles[1]); 216 if (sig) 217 _exit(status); 218 exit(status); 219 } 220 221 void * 222 emalloc(size_t n) 223 { 224 void *p; 225 226 if ((p = malloc(n)) == NULL) 227 error("files too big, try -h"); 228 return (p); 229 } 230 231 void * 232 erealloc(void *p, size_t n) 233 { 234 void *q; 235 236 if ((q = realloc(p, n)) == NULL) 237 error("files too big, try -h"); 238 return (q); 239 } 240 241 __dead void 242 error(const char *fmt, ...) 243 { 244 va_list ap; 245 int sverrno = errno; 246 247 if (tempfiles[0] != NULL) 248 unlink(tempfiles[0]); 249 if (tempfiles[1] != NULL) 250 unlink(tempfiles[1]); 251 errno = sverrno; 252 va_start(ap, fmt); 253 verr(status, fmt, ap); 254 va_end(ap); 255 } 256 257 __dead void 258 errorx(const char *fmt, ...) 259 { 260 va_list ap; 261 262 if (tempfiles[0] != NULL) 263 unlink(tempfiles[0]); 264 if (tempfiles[1] != NULL) 265 unlink(tempfiles[1]); 266 va_start(ap, fmt); 267 verrx(status, fmt, ap); 268 va_end(ap); 269 } 270 271 __dead void 272 usage(void) 273 { 274 (void)fprintf(stderr, 275 "usage: diff [-bitw] [-c | -e | -f | -h | -n | -u ] file1 file2\n" 276 " diff [-bitw] -C number file1 file2\n" 277 " diff [-bitw] -D string file1 file2\n" 278 " diff [-bitw] -U number file1 file2\n" 279 " diff [-biwt] [-c | -e | -f | -h | -n | -u ] " 280 "[-l] [-r] [-s] [-S name]\n dir1 dir2\n"); 281 282 exit(2); 283 } 284