1 /*- 2 * Copyright (c) 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * %sccs.include.proprietary.c% 6 */ 7 8 #ifndef lint 9 static char copyright[] = 10 "@(#) Copyright (c) 1991, 1993\n\ 11 The Regents of the University of California. All rights reserved.\n"; 12 #endif /* not lint */ 13 14 #ifndef lint 15 static char sccsid[] = "@(#)diff.c 8.1 (Berkeley) 06/06/93"; 16 #endif /* not lint */ 17 18 #include "diff.h" 19 #include "pathnames.h" 20 21 /* 22 * diff - driver and subroutines 23 */ 24 25 char diff[] = _PATH_DIFF; 26 char diffh[] = _PATH_DIFFH; 27 char pr[] = _PATH_PR; 28 29 main(argc, argv) 30 int argc; 31 char **argv; 32 { 33 register char *argp; 34 35 ifdef1 = "FILE1"; ifdef2 = "FILE2"; 36 status = 2; 37 diffargv = argv; 38 argc--, argv++; 39 while (argc > 2 && argv[0][0] == '-') { 40 argp = &argv[0][1]; 41 argv++, argc--; 42 while (*argp) switch(*argp++) { 43 44 #ifdef notdef 45 case 'I': 46 opt = D_IFDEF; 47 wantelses = 0; 48 continue; 49 case 'E': 50 opt = D_IFDEF; 51 wantelses = 1; 52 continue; 53 case '1': 54 opt = D_IFDEF; 55 ifdef1 = argp; 56 *--argp = 0; 57 continue; 58 #endif 59 case 'D': 60 /* -Dfoo = -E -1 -2foo */ 61 wantelses = 1; 62 ifdef1 = ""; 63 /* fall through */ 64 #ifdef notdef 65 case '2': 66 #endif 67 opt = D_IFDEF; 68 ifdef2 = argp; 69 *--argp = 0; 70 continue; 71 case 'e': 72 opt = D_EDIT; 73 continue; 74 case 'f': 75 opt = D_REVERSE; 76 continue; 77 case 'n': 78 opt = D_NREVERSE; 79 continue; 80 case 'b': 81 bflag = 1; 82 continue; 83 case 'w': 84 wflag = 1; 85 continue; 86 case 'i': 87 iflag = 1; 88 continue; 89 case 't': 90 tflag = 1; 91 continue; 92 case 'c': 93 opt = D_CONTEXT; 94 if (isdigit(*argp)) { 95 context = atoi(argp); 96 while (isdigit(*argp)) 97 argp++; 98 if (*argp) { 99 fprintf(stderr, 100 "diff: -c: bad count\n"); 101 done(); 102 } 103 argp = ""; 104 } else 105 context = 3; 106 continue; 107 case 'h': 108 hflag++; 109 continue; 110 case 'S': 111 if (*argp == 0) { 112 fprintf(stderr, "diff: use -Sstart\n"); 113 done(); 114 } 115 Start = argp; 116 *--argp = 0; /* don't pass it on */ 117 continue; 118 case 'r': 119 rflag++; 120 continue; 121 case 's': 122 sflag++; 123 continue; 124 case 'l': 125 lflag++; 126 continue; 127 default: 128 fprintf(stderr, "diff: -%s: unknown option\n", 129 --argp); 130 done(); 131 } 132 } 133 if (argc != 2) { 134 fprintf(stderr, "diff: two filename arguments required\n"); 135 done(); 136 } 137 file1 = argv[0]; 138 file2 = argv[1]; 139 if (hflag && opt) { 140 fprintf(stderr, 141 "diff: -h doesn't support -e, -f, -n, -c, or -I\n"); 142 done(); 143 } 144 if (!strcmp(file1, "-")) 145 stb1.st_mode = S_IFREG; 146 else if (stat(file1, &stb1) < 0) { 147 fprintf(stderr, "diff: "); 148 perror(file1); 149 done(); 150 } 151 if (!strcmp(file2, "-")) 152 stb2.st_mode = S_IFREG; 153 else if (stat(file2, &stb2) < 0) { 154 fprintf(stderr, "diff: "); 155 perror(file2); 156 done(); 157 } 158 if ((stb1.st_mode & S_IFMT) == S_IFDIR && 159 (stb2.st_mode & S_IFMT) == S_IFDIR) { 160 diffdir(argv); 161 } else 162 diffreg(); 163 done(); 164 } 165 166 char * 167 savestr(cp) 168 register char *cp; 169 { 170 register char *dp = malloc(strlen(cp)+1); 171 172 if (dp == 0) { 173 fprintf(stderr, "diff: ran out of memory\n"); 174 done(); 175 } 176 strcpy(dp, cp); 177 return (dp); 178 } 179 180 min(a,b) 181 int a,b; 182 { 183 184 return (a < b ? a : b); 185 } 186 187 max(a,b) 188 int a,b; 189 { 190 191 return (a > b ? a : b); 192 } 193 194 void 195 done() 196 { 197 if (tempfile) 198 unlink(tempfile); 199 exit(status); 200 } 201 202 char * 203 talloc(n) 204 { 205 register char *p; 206 207 if ((p = malloc((unsigned)n)) != NULL) 208 return(p); 209 noroom(); 210 } 211 212 char * 213 ralloc(p,n) 214 char *p; 215 { 216 register char *q; 217 char *realloc(); 218 219 if ((q = realloc(p, (unsigned)n)) == NULL) 220 noroom(); 221 return(q); 222 } 223 224 noroom() 225 { 226 fprintf(stderr, "diff: files too big, try -h\n"); 227 done(); 228 } 229