Commit | Line | Data |
---|---|---|
a3e88724 | 1 | static char sccsid[] = "@(#)diff.c 4.5 %G%"; |
ac1f8a08 BJ |
2 | |
3 | #include "diff.h" | |
4 | /* | |
5 | * diff - driver and subroutines | |
6 | */ | |
7 | ||
8 | char diff[] = DIFF; | |
9 | char diffh[] = DIFFH; | |
10 | char pr[] = PR; | |
ac1f8a08 BJ |
11 | |
12 | main(argc, argv) | |
13 | int argc; | |
14 | char **argv; | |
15 | { | |
16 | register char *argp; | |
17 | ||
18 | ifdef1 = "FILE1"; ifdef2 = "FILE2"; | |
19 | status = 2; | |
20 | diffargv = argv; | |
ac1f8a08 BJ |
21 | argc--, argv++; |
22 | while (argc > 2 && argv[0][0] == '-') { | |
23 | argp = &argv[0][1]; | |
24 | argv++, argc--; | |
25 | while (*argp) switch(*argp++) { | |
26 | ||
27 | #ifdef notdef | |
28 | case 'I': | |
29 | opt = D_IFDEF; | |
30 | wantelses = 0; | |
31 | continue; | |
32 | case 'E': | |
33 | opt = D_IFDEF; | |
34 | wantelses = 1; | |
35 | continue; | |
36 | case '1': | |
37 | opt = D_IFDEF; | |
38 | ifdef1 = argp; | |
39 | *--argp = 0; | |
40 | continue; | |
41 | #endif | |
42 | case 'D': | |
43 | /* -Dfoo = -E -1 -2foo */ | |
44 | wantelses = 1; | |
45 | ifdef1 = ""; | |
46 | /* fall through */ | |
47 | #ifdef notdef | |
48 | case '2': | |
49 | #endif | |
50 | opt = D_IFDEF; | |
51 | ifdef2 = argp; | |
52 | *--argp = 0; | |
53 | continue; | |
54 | case 'e': | |
55 | opt = D_EDIT; | |
56 | continue; | |
57 | case 'f': | |
58 | opt = D_REVERSE; | |
59 | continue; | |
a3e88724 VJ |
60 | case 'n': |
61 | opt = D_NREVERSE; | |
62 | continue; | |
ac1f8a08 BJ |
63 | case 'b': |
64 | bflag = 1; | |
65 | continue; | |
c470b1f1 VJ |
66 | case 'w': |
67 | wflag = 1; | |
68 | continue; | |
69 | case 'i': | |
70 | iflag = 1; | |
71 | continue; | |
72 | case 't': | |
73 | tflag = 1; | |
74 | continue; | |
ac1f8a08 BJ |
75 | case 'c': |
76 | opt = D_CONTEXT; | |
77 | if (isdigit(*argp)) { | |
78 | context = atoi(argp); | |
79 | while (isdigit(*argp)) | |
80 | argp++; | |
81 | if (*argp) { | |
82 | fprintf(stderr, | |
83 | "diff: -c: bad count\n"); | |
84 | done(); | |
85 | } | |
86 | argp = ""; | |
87 | } else | |
88 | context = 3; | |
89 | continue; | |
90 | case 'h': | |
91 | hflag++; | |
92 | continue; | |
93 | case 'S': | |
94 | if (*argp == 0) { | |
95 | fprintf(stderr, "diff: use -Sstart\n"); | |
96 | done(); | |
97 | } | |
98 | start = argp; | |
99 | *--argp = 0; /* don't pass it on */ | |
100 | continue; | |
101 | case 'r': | |
102 | rflag++; | |
103 | continue; | |
104 | case 's': | |
105 | sflag++; | |
106 | continue; | |
107 | case 'l': | |
108 | lflag++; | |
109 | continue; | |
110 | default: | |
111 | fprintf(stderr, "diff: -%s: unknown option\n", | |
112 | --argp); | |
113 | done(); | |
114 | } | |
115 | } | |
116 | if (argc != 2) { | |
117 | fprintf(stderr, "diff: two filename arguments required\n"); | |
118 | done(); | |
119 | } | |
120 | file1 = argv[0]; | |
121 | file2 = argv[1]; | |
122 | if (hflag && opt) { | |
123 | fprintf(stderr, | |
a3e88724 | 124 | "diff: -h doesn't support -e, -f, -n, -c, or -I\n"); |
ac1f8a08 BJ |
125 | done(); |
126 | } | |
127 | if (!strcmp(file1, "-")) | |
128 | stb1.st_mode = S_IFREG; | |
129 | else if (stat(file1, &stb1) < 0) { | |
130 | fprintf(stderr, "diff: "); | |
131 | perror(file1); | |
132 | done(); | |
133 | } | |
134 | if (!strcmp(file2, "-")) | |
135 | stb2.st_mode = S_IFREG; | |
136 | else if (stat(file2, &stb2) < 0) { | |
137 | fprintf(stderr, "diff: "); | |
138 | perror(file2); | |
139 | done(); | |
140 | } | |
141 | if ((stb1.st_mode & S_IFMT) == S_IFDIR && | |
142 | (stb2.st_mode & S_IFMT) == S_IFDIR) { | |
143 | diffdir(argv); | |
144 | } else | |
145 | diffreg(); | |
146 | done(); | |
147 | } | |
148 | ||
149 | char * | |
150 | savestr(cp) | |
151 | register char *cp; | |
152 | { | |
153 | register char *dp = malloc(strlen(cp)+1); | |
154 | ||
155 | if (dp == 0) { | |
156 | fprintf(stderr, "diff: ran out of memory\n"); | |
157 | done(); | |
158 | } | |
159 | strcpy(dp, cp); | |
160 | return (dp); | |
161 | } | |
162 | ||
163 | min(a,b) | |
164 | int a,b; | |
165 | { | |
166 | ||
167 | return (a < b ? a : b); | |
168 | } | |
169 | ||
170 | max(a,b) | |
171 | int a,b; | |
172 | { | |
173 | ||
174 | return (a > b ? a : b); | |
175 | } | |
176 | ||
177 | done() | |
178 | { | |
179 | unlink(tempfile); | |
180 | exit(status); | |
181 | } | |
182 | ||
183 | char * | |
184 | talloc(n) | |
185 | { | |
186 | register char *p; | |
cb47fa51 JL |
187 | |
188 | if ((p = malloc((unsigned)n)) != NULL) | |
ac1f8a08 BJ |
189 | return(p); |
190 | noroom(); | |
191 | } | |
192 | ||
193 | char * | |
cb47fa51 | 194 | ralloc(p,n) |
ac1f8a08 BJ |
195 | char *p; |
196 | { | |
197 | register char *q; | |
198 | char *realloc(); | |
cb47fa51 JL |
199 | |
200 | if ((q = realloc(p, (unsigned)n)) == NULL) | |
ac1f8a08 BJ |
201 | noroom(); |
202 | return(q); | |
203 | } | |
204 | ||
205 | noroom() | |
206 | { | |
207 | fprintf(stderr, "diff: files too big, try -h\n"); | |
208 | done(); | |
209 | } |