1 /* $OpenBSD: diff.c,v 1.15 2003/06/26 18:19:29 millert 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 <unistd.h> 41 42 #include "diff.h" 43 #include "pathnames.h" 44 45 #if 0 46 static char const sccsid[] = "@(#)diff.c 4.7 5/11/89"; 47 #endif 48 49 /* 50 * diff - driver and subroutines 51 */ 52 int opt; 53 int aflag; /* treat all files as text */ 54 int tflag; /* expand tabs on output */ 55 /* Algorithm related options. */ 56 int hflag; /* -h, use halfhearted DIFFH */ 57 int bflag; /* ignore blanks in comparisons */ 58 int wflag; /* totally ignore blanks in comparisons */ 59 int iflag; /* ignore case in comparisons */ 60 /* Options on hierarchical diffs. */ 61 int lflag; /* long output format with header */ 62 int rflag; /* recursively trace directories */ 63 int sflag; /* announce files which are same */ 64 char *start; /* do file only if name >= this */ 65 /* Variables for -I D_IFDEF option. */ 66 int wantelses; /* -E */ 67 char *ifdef1; /* String for -1 */ 68 char *ifdef2; /* String for -2 */ 69 char *endifname; /* What we will print on next #endif */ 70 int inifdef; 71 /* Variables for -c and -u context option. */ 72 int context; /* lines of context to be printed */ 73 /* State for exit status. */ 74 int status; 75 int anychange; 76 char *tempfile; /* used when comparing against std input */ 77 /* Variables for diffdir. */ 78 char **diffargv; /* option list to pass to recursive diffs */ 79 80 /* 81 * Input file names. 82 * With diffdir, file1 and file2 are allocated BUFSIZ space, 83 * and padded with a '/', and then efile0 and efile1 point after 84 * the '/'. 85 */ 86 char *file1, *file2, *efile1, *efile2; 87 struct stat stb1, stb2; 88 89 const char *diff = _PATH_DIFF; 90 const char *diffh = _PATH_DIFFH; 91 const char *pr = _PATH_PR; 92 93 __dead void usage(void); 94 95 int 96 main(int argc, char **argv) 97 { 98 int ch; 99 100 ifdef1 = "FILE1"; 101 ifdef2 = "FILE2"; 102 status = 2; 103 diffargv = argv; 104 105 while ((ch = getopt(argc, argv, "abC:cD:efhilnrS:stU:uw")) != -1) { 106 switch (ch) { 107 case 'a': 108 aflag++; 109 break; 110 case 'b': 111 bflag++; 112 break; 113 case 'C': 114 opt = D_CONTEXT; 115 if (!isdigit(*optarg)) 116 usage(); 117 context = atoi(optarg); /* XXX - use strtol */ 118 break; 119 case 'c': 120 opt = D_CONTEXT; 121 context = 3; 122 break; 123 case 'D': 124 /* -Dfoo = -E -1 -2foo */ 125 opt = D_IFDEF; 126 ifdef1 = ""; 127 ifdef2 = optarg; 128 wantelses++; 129 break; 130 case 'e': 131 opt = D_EDIT; 132 break; 133 case 'f': 134 opt = D_REVERSE; 135 break; 136 case 'h': 137 hflag++; 138 break; 139 case 'i': 140 iflag++; 141 break; 142 case 'l': 143 lflag++; 144 break; 145 case 'n': 146 opt = D_NREVERSE; 147 break; 148 case 'r': 149 opt = D_REVERSE; 150 break; 151 case 'S': 152 start = optarg; 153 break; 154 case 's': 155 sflag++; 156 break; 157 case 't': 158 tflag++; 159 break; 160 case 'U': 161 opt = D_UNIFIED; 162 if (!isdigit(*optarg)) 163 usage(); 164 context = atoi(optarg); /* XXX - use strtol */ 165 break; 166 case 'u': 167 opt = D_UNIFIED; 168 context = 3; 169 break; 170 case 'w': 171 wflag++; 172 break; 173 default: 174 usage(); 175 break; 176 } 177 } 178 argc -= optind; 179 argv += optind; 180 181 if (argc != 2) 182 errorx("two filename arguments required"); 183 file1 = argv[0]; 184 file2 = argv[1]; 185 if (hflag && opt) 186 errorx("-h doesn't support -D, -c, -C, -e, -f, -I, -n, -u or -U"); 187 if (!strcmp(file1, "-")) 188 stb1.st_mode = S_IFREG; 189 else if (stat(file1, &stb1) < 0) 190 error("%s", file1); 191 if (!strcmp(file2, "-")) 192 stb2.st_mode = S_IFREG; 193 else if (stat(file2, &stb2) < 0) 194 error("%s", file2); 195 if (S_ISDIR(stb1.st_mode) && S_ISDIR(stb2.st_mode)) 196 diffdir(argv); 197 else 198 diffreg(); 199 done(0); 200 } 201 202 int 203 min(int a, int b) 204 { 205 206 return (a < b ? a : b); 207 } 208 209 int 210 max(int a, int b) 211 { 212 213 return (a > b ? a : b); 214 } 215 216 __dead void 217 done(int sig) 218 { 219 if (tempfiles[0] != NULL) 220 unlink(tempfiles[0]); 221 if (tempfiles[1] != NULL) 222 unlink(tempfiles[1]); 223 if (sig) 224 _exit(status); 225 exit(status); 226 } 227 228 void * 229 emalloc(size_t n) 230 { 231 void *p; 232 233 if ((p = malloc(n)) == NULL) 234 error("files too big, try -h"); 235 return (p); 236 } 237 238 void * 239 erealloc(void *p, size_t n) 240 { 241 void *q; 242 243 if ((q = realloc(p, n)) == NULL) 244 error("files too big, try -h"); 245 return (q); 246 } 247 248 __dead void 249 error(const char *fmt, ...) 250 { 251 va_list ap; 252 int sverrno = errno; 253 254 if (tempfiles[0] != NULL) 255 unlink(tempfiles[0]); 256 if (tempfiles[1] != NULL) 257 unlink(tempfiles[1]); 258 errno = sverrno; 259 va_start(ap, fmt); 260 verr(status, fmt, ap); 261 va_end(ap); 262 } 263 264 __dead void 265 errorx(const char *fmt, ...) 266 { 267 va_list ap; 268 269 if (tempfiles[0] != NULL) 270 unlink(tempfiles[0]); 271 if (tempfiles[1] != NULL) 272 unlink(tempfiles[1]); 273 va_start(ap, fmt); 274 verrx(status, fmt, ap); 275 va_end(ap); 276 } 277 278 __dead void 279 usage(void) 280 { 281 (void)fprintf(stderr, 282 "usage: diff [-bitw] [-c | -e | -f | -h | -n | -u ] file1 file2\n" 283 " diff [-bitw] -C number file1 file2\n" 284 " diff [-bitw] -D string file1 file2\n" 285 " diff [-bitw] -U number file1 file2\n" 286 " diff [-biwt] [-c | -e | -f | -h | -n | -u ] " 287 "[-l] [-r] [-s] [-S name]\n dir1 dir2\n"); 288 289 exit(2); 290 } 291