Commit | Line | Data |
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cc6679ee BJ |
1 | /* Copyright (c) 1979 Regents of the University of California */ |
2 | #include <stdio.h> | |
3 | /* | |
4 | * grep -- print lines matching (or not matching) a pattern | |
5 | */ | |
6 | ||
7 | #define CCHR 2 | |
8 | #define CDOT 4 | |
9 | #define CCL 6 | |
10 | #define NCCL 8 | |
11 | #define CDOL 10 | |
12 | #define CEOF 11 | |
13 | ||
14 | #define CBRC 14 | |
15 | #define CLET 15 | |
16 | #define STAR 01 | |
17 | ||
18 | #define LBSIZE 256 | |
19 | #define ESIZE 256 | |
20 | ||
21 | char expbuf[ESIZE]; | |
22 | long lnum; | |
23 | char linebuf[LBSIZE+1]; | |
24 | int bflag; | |
25 | int nflag; | |
26 | int cflag; | |
27 | int vflag; | |
28 | int nfile; | |
29 | int iflag; | |
30 | int lflag; | |
31 | int wflag; | |
32 | int circf; | |
33 | int blkno; | |
34 | char ibuf[512]; | |
35 | long tln; | |
36 | ||
37 | main(argc, argv) | |
38 | char **argv; | |
39 | { | |
40 | char obuf[BUFSIZ]; | |
41 | ||
42 | setbuf(stdout, obuf); | |
43 | while (--argc > 0 && (++argv)[0][0]=='-') { | |
44 | char *cp = argv[0] + 1; | |
45 | while (*cp) switch (*cp++) { | |
46 | ||
47 | case 'v': | |
48 | vflag++; | |
49 | continue; | |
50 | ||
51 | case 'b': | |
52 | bflag++; | |
53 | continue; | |
54 | ||
55 | case 'i': | |
56 | iflag++; | |
57 | continue; | |
58 | ||
59 | case 'l': | |
60 | lflag++; | |
61 | case 'c': | |
62 | cflag++; | |
63 | continue; | |
64 | ||
65 | case 'w': | |
66 | wflag++; | |
67 | continue; | |
68 | ||
69 | case 'n': | |
70 | nflag++; | |
71 | continue; | |
72 | ||
73 | default: | |
74 | fprintf(stderr, "Unknown flag\n"); | |
75 | continue; | |
76 | } | |
77 | } | |
78 | if (argc<=0) | |
79 | exit(2); | |
80 | compile(*argv); | |
81 | nfile = --argc; | |
82 | if (argc<=0) | |
83 | execute(0); | |
84 | else while (--argc >= 0) { | |
85 | argv++; | |
86 | execute(*argv); | |
87 | } | |
88 | exit(0); | |
89 | } | |
90 | ||
91 | compile(astr) | |
92 | char *astr; | |
93 | { | |
94 | register c; | |
95 | register char *ep, *sp; | |
96 | char *lastep; | |
97 | int cclcnt; | |
98 | ||
99 | ep = expbuf; | |
100 | sp = astr; | |
101 | if (*sp == '^') { | |
102 | circf++; | |
103 | sp++; | |
104 | } | |
105 | if (wflag) | |
106 | *ep++ = CBRC; | |
107 | for (;;) { | |
108 | if (ep >= &expbuf[ESIZE]) | |
109 | goto cerror; | |
110 | if ((c = *sp++) != '*') | |
111 | lastep = ep; | |
112 | switch (c) { | |
113 | ||
114 | case '\0': | |
115 | if (wflag) | |
116 | *ep++ = CLET; | |
117 | *ep++ = CEOF; | |
118 | return; | |
119 | ||
120 | case '.': | |
121 | *ep++ = CDOT; | |
122 | continue; | |
123 | ||
124 | case '*': | |
125 | if (lastep==0) | |
126 | goto defchar; | |
127 | *lastep =| STAR; | |
128 | continue; | |
129 | ||
130 | case '$': | |
131 | if (*sp != '\0') | |
132 | goto defchar; | |
133 | *ep++ = CDOL; | |
134 | continue; | |
135 | ||
136 | case '[': | |
137 | *ep++ = CCL; | |
138 | *ep++ = 0; | |
139 | cclcnt = 1; | |
140 | if ((c = *sp++) == '^') { | |
141 | c = *sp++; | |
142 | ep[-2] = NCCL; | |
143 | } | |
144 | do { | |
145 | *ep++ = c; | |
146 | cclcnt++; | |
147 | if (c=='\0' || ep >= &expbuf[ESIZE]) | |
148 | goto cerror; | |
149 | } while ((c = *sp++) != ']'); | |
150 | lastep[1] = cclcnt; | |
151 | continue; | |
152 | ||
153 | case '\\': | |
154 | if ((c = *sp++) == '\0') | |
155 | goto cerror; | |
156 | if (c == '<') { | |
157 | *ep++ = CBRC; | |
158 | continue; | |
159 | } | |
160 | if (c == '>') { | |
161 | *ep++ = CLET; | |
162 | continue; | |
163 | } | |
164 | defchar: | |
165 | default: | |
166 | *ep++ = CCHR; | |
167 | *ep++ = c; | |
168 | } | |
169 | } | |
170 | cerror: | |
171 | fprintf(stderr, "RE error\n"); | |
172 | } | |
173 | ||
174 | same(a, b) | |
175 | register int a, b; | |
176 | { | |
177 | ||
178 | return (a == b || iflag && (a ^ b) == ' ' && letter(a) == letter(b)); | |
179 | } | |
180 | ||
181 | letter(c) | |
182 | register int c; | |
183 | { | |
184 | ||
185 | if (c >= 'a' && c <= 'z') | |
186 | return (c); | |
187 | if (c >= 'A' && c <= 'Z') | |
188 | return (c + 'a' - 'A'); | |
189 | return (0); | |
190 | } | |
191 | ||
192 | execute(file) | |
193 | { | |
194 | register char *p1, *p2; | |
195 | register c; | |
196 | int f; | |
197 | char *ebp, *cbp; | |
198 | ||
199 | if (file) { | |
200 | if ((f = open(file, 0)) < 0) { | |
201 | fprintf(stderr, "Can't open %s\n", file); | |
202 | } | |
203 | } else | |
204 | f = 0; | |
205 | ebp = ibuf; | |
206 | cbp = ibuf; | |
207 | lnum = 0; | |
208 | tln = 0; | |
209 | blkno = -1; | |
210 | for (;;) { | |
211 | lnum++; | |
212 | if((lnum&0377) == 0) | |
213 | fflush(stdout); | |
214 | p1 = linebuf; | |
215 | p2 = cbp; | |
216 | for (;;) { | |
217 | if (p2 >= ebp) { | |
218 | if ((c = read(f, ibuf, 512)) <= 0) { | |
219 | close(f); | |
220 | if (cflag) { | |
221 | if (lflag) { | |
222 | if (tln) | |
223 | printf("%s\n", file); | |
224 | } else { | |
225 | if (nfile > 1) | |
226 | printf("%s:", file); | |
227 | printf("%ld\n", tln); | |
228 | } | |
229 | } | |
230 | return; | |
231 | } | |
232 | blkno++; | |
233 | p2 = ibuf; | |
234 | ebp = ibuf+c; | |
235 | } | |
236 | if ((c = *p2++) == '\n') | |
237 | break; | |
238 | if(c) | |
239 | if (p1 < &linebuf[LBSIZE-1]) | |
240 | *p1++ = c; | |
241 | } | |
242 | *p1++ = 0; | |
243 | cbp = p2; | |
244 | p1 = linebuf; | |
245 | p2 = expbuf; | |
246 | if (circf) { | |
247 | if (advance(p1, p2)) | |
248 | goto found; | |
249 | goto nfound; | |
250 | } | |
251 | /* fast check for first character */ | |
252 | if (*p2==CCHR) { | |
253 | c = p2[1]; | |
254 | do { | |
255 | if (*p1!=c && (!iflag || (c ^ *p1) != ' ' | |
256 | || letter(c) != letter(*p1))) | |
257 | continue; | |
258 | if (advance(p1, p2)) | |
259 | goto found; | |
260 | } while (*p1++); | |
261 | goto nfound; | |
262 | } | |
263 | /* regular algorithm */ | |
264 | do { | |
265 | if (advance(p1, p2)) | |
266 | goto found; | |
267 | } while (*p1++); | |
268 | nfound: | |
269 | if (vflag) | |
270 | succeed(file); | |
271 | continue; | |
272 | found: | |
273 | if (vflag==0) | |
274 | succeed(file); | |
275 | } | |
276 | } | |
277 | ||
278 | advance(alp, aep) | |
279 | { | |
280 | register char *lp, *ep, *curlp; | |
281 | char *nextep; | |
282 | ||
283 | lp = alp; | |
284 | ep = aep; | |
285 | for (;;) switch (*ep++) { | |
286 | ||
287 | case CCHR: | |
288 | if (!same(*ep, *lp)) | |
289 | return (0); | |
290 | ep++, lp++; | |
291 | continue; | |
292 | ||
293 | case CDOT: | |
294 | if (*lp++) | |
295 | continue; | |
296 | return(0); | |
297 | ||
298 | case CDOL: | |
299 | if (*lp==0) | |
300 | continue; | |
301 | return(0); | |
302 | ||
303 | case CEOF: | |
304 | return(1); | |
305 | ||
306 | case CCL: | |
307 | if (cclass(ep, *lp++, 1)) { | |
308 | ep =+ *ep; | |
309 | continue; | |
310 | } | |
311 | return(0); | |
312 | ||
313 | case NCCL: | |
314 | if (cclass(ep, *lp++, 0)) { | |
315 | ep =+ *ep; | |
316 | continue; | |
317 | } | |
318 | return(0); | |
319 | ||
320 | case CDOT|STAR: | |
321 | curlp = lp; | |
322 | while (*lp++); | |
323 | goto star; | |
324 | ||
325 | case CCHR|STAR: | |
326 | curlp = lp; | |
327 | while (same(*lp, *ep)) | |
328 | lp++; | |
329 | lp++; | |
330 | ep++; | |
331 | goto star; | |
332 | ||
333 | case CCL|STAR: | |
334 | case NCCL|STAR: | |
335 | curlp = lp; | |
336 | while (cclass(ep, *lp++, ep[-1]==(CCL|STAR))); | |
337 | ep =+ *ep; | |
338 | goto star; | |
339 | ||
340 | star: | |
341 | do { | |
342 | lp--; | |
343 | if (advance(lp, ep)) | |
344 | return(1); | |
345 | } while (lp > curlp); | |
346 | return(0); | |
347 | ||
348 | case CBRC: | |
349 | if (lp == expbuf) | |
350 | continue; | |
351 | #define uletter(c) (letter(c) || c == '_') | |
352 | if (uletter(*lp) && !uletter(lp[-1]) && !digit(lp[-1])) | |
353 | continue; | |
354 | return (0); | |
355 | ||
356 | case CLET: | |
357 | if (!uletter(*lp) && !digit(*lp)) | |
358 | continue; | |
359 | return (0); | |
360 | ||
361 | default: | |
362 | fprintf(stderr, "RE botch\n"); | |
363 | } | |
364 | } | |
365 | ||
366 | cclass(aset, ac, af) | |
367 | { | |
368 | register char *set, c; | |
369 | register n; | |
370 | ||
371 | set = aset; | |
372 | if ((c = ac) == 0) | |
373 | return(0); | |
374 | n = *set++; | |
375 | while (--n) | |
376 | if (n > 2 && set[1] == '-') { | |
377 | if (c >= (set[0] & 0177) && c <= (set[2] & 0177)) | |
378 | return (af); | |
379 | set =+ 3; | |
380 | n -= 2; | |
381 | } else | |
382 | if ((*set++ & 0177) == c) | |
383 | return(af); | |
384 | return(!af); | |
385 | } | |
386 | ||
387 | succeed(f) | |
388 | { | |
389 | if (cflag) { | |
390 | tln++; | |
391 | return; | |
392 | } | |
393 | if (nfile > 1) | |
394 | printf("%s:", f); | |
395 | if (bflag) | |
396 | printf("%l:", blkno); | |
397 | if (nflag) | |
398 | printf("%ld:", lnum); | |
399 | printf("%s\n", linebuf); | |
400 | } | |
401 | ||
402 | digit(c) | |
403 | char c; | |
404 | { | |
405 | return (c>='0' && c<='9'); | |
406 | } |