| 1 | /* |
| 2 | * fgrep -- print all lines containing any of a set of keywords |
| 3 | * |
| 4 | * status returns: |
| 5 | * 0 - ok, and some matches |
| 6 | * 1 - ok, but no matches |
| 7 | * 2 - some error |
| 8 | */ |
| 9 | |
| 10 | #include <stdio.h> |
| 11 | |
| 12 | #define MAXSIZ 6000 |
| 13 | #define QSIZE 400 |
| 14 | struct words { |
| 15 | char inp; |
| 16 | char out; |
| 17 | struct words *nst; |
| 18 | struct words *link; |
| 19 | struct words *fail; |
| 20 | } w[MAXSIZ], *smax, *q; |
| 21 | |
| 22 | long lnum; |
| 23 | int bflag, cflag, fflag, lflag, nflag, vflag, xflag; |
| 24 | int hflag = 1; |
| 25 | int sflag; |
| 26 | int nfile; |
| 27 | int blkno; |
| 28 | int nsucc; |
| 29 | long tln; |
| 30 | FILE *wordf; |
| 31 | char *argptr; |
| 32 | |
| 33 | main(argc, argv) |
| 34 | char **argv; |
| 35 | { |
| 36 | while (--argc > 0 && (++argv)[0][0]=='-') |
| 37 | switch (argv[0][1]) { |
| 38 | |
| 39 | case 's': |
| 40 | sflag++; |
| 41 | continue; |
| 42 | |
| 43 | case 'h': |
| 44 | hflag = 0; |
| 45 | continue; |
| 46 | |
| 47 | case 'b': |
| 48 | bflag++; |
| 49 | continue; |
| 50 | |
| 51 | case 'c': |
| 52 | cflag++; |
| 53 | continue; |
| 54 | |
| 55 | case 'e': |
| 56 | argc--; |
| 57 | argv++; |
| 58 | goto out; |
| 59 | |
| 60 | case 'f': |
| 61 | fflag++; |
| 62 | continue; |
| 63 | |
| 64 | case 'l': |
| 65 | lflag++; |
| 66 | continue; |
| 67 | |
| 68 | case 'n': |
| 69 | nflag++; |
| 70 | continue; |
| 71 | |
| 72 | case 'v': |
| 73 | vflag++; |
| 74 | continue; |
| 75 | |
| 76 | case 'x': |
| 77 | xflag++; |
| 78 | continue; |
| 79 | |
| 80 | default: |
| 81 | fprintf(stderr, "egrep: unknown flag\n"); |
| 82 | continue; |
| 83 | } |
| 84 | out: |
| 85 | if (argc<=0) |
| 86 | exit(2); |
| 87 | if (fflag) { |
| 88 | wordf = fopen(*argv, "r"); |
| 89 | if (wordf==NULL) { |
| 90 | fprintf(stderr, "egrep: can't open %s\n", *argv); |
| 91 | exit(2); |
| 92 | } |
| 93 | } |
| 94 | else argptr = *argv; |
| 95 | argc--; |
| 96 | argv++; |
| 97 | |
| 98 | cgotofn(); |
| 99 | cfail(); |
| 100 | nfile = argc; |
| 101 | if (argc<=0) { |
| 102 | if (lflag) exit(1); |
| 103 | execute((char *)NULL); |
| 104 | } |
| 105 | else while (--argc >= 0) { |
| 106 | execute(*argv); |
| 107 | argv++; |
| 108 | } |
| 109 | exit(nsucc == 0); |
| 110 | } |
| 111 | |
| 112 | execute(file) |
| 113 | char *file; |
| 114 | { |
| 115 | register char *p; |
| 116 | register struct words *c; |
| 117 | register ccount; |
| 118 | char buf[1024]; |
| 119 | int f; |
| 120 | int failed, ecnt; |
| 121 | char *nlp; |
| 122 | if (file) { |
| 123 | if ((f = open(file, 0)) < 0) { |
| 124 | fprintf(stderr, "fgrep: can't open %s\n", file); |
| 125 | exit(2); |
| 126 | } |
| 127 | } |
| 128 | else f = 0; |
| 129 | ccount = 0; |
| 130 | failed = 0; |
| 131 | lnum = 1; |
| 132 | tln = 0; |
| 133 | blkno = -1; |
| 134 | p = buf; |
| 135 | nlp = p; |
| 136 | c = w; |
| 137 | for (;;) { |
| 138 | if (--ccount <= 0) { |
| 139 | if (p == &buf[1024]) p = buf; |
| 140 | if (p > &buf[512]) { |
| 141 | if ((ccount = read(f, p, &buf[1024] - p)) <= 0) break; |
| 142 | } |
| 143 | else if ((ccount = read(f, p, 512)) <= 0) break; |
| 144 | blkno++; |
| 145 | } |
| 146 | nstate: |
| 147 | if (c->inp == *p) { |
| 148 | c = c->nst; |
| 149 | } |
| 150 | else if (c->link != 0) { |
| 151 | c = c->link; |
| 152 | goto nstate; |
| 153 | } |
| 154 | else { |
| 155 | c = c->fail; |
| 156 | failed = 1; |
| 157 | if (c==0) { |
| 158 | c = w; |
| 159 | istate: |
| 160 | if (c->inp == *p) { |
| 161 | c = c->nst; |
| 162 | } |
| 163 | else if (c->link != 0) { |
| 164 | c = c->link; |
| 165 | goto istate; |
| 166 | } |
| 167 | } |
| 168 | else goto nstate; |
| 169 | } |
| 170 | if (c->out) { |
| 171 | ecnt = 0; |
| 172 | while (*p++ != '\n') { |
| 173 | ecnt++; |
| 174 | if (--ccount <= 0) { |
| 175 | if (p == &buf[1024]) p = buf; |
| 176 | if (p > &buf[512]) { |
| 177 | if ((ccount = read(f, p, &buf[1024] - p)) <= 0) break; |
| 178 | } |
| 179 | else if ((ccount = read(f, p, 512)) <= 0) break; |
| 180 | blkno++; |
| 181 | } |
| 182 | } |
| 183 | if (vflag == 0) { |
| 184 | if (xflag) |
| 185 | if (failed || ecnt > 1) goto nogood; |
| 186 | succeed: nsucc = 1; |
| 187 | if (cflag) tln++; |
| 188 | else if (sflag) |
| 189 | ; /* ugh */ |
| 190 | else if (lflag) { |
| 191 | printf("%s\n", file); |
| 192 | close(f); |
| 193 | return; |
| 194 | } |
| 195 | else { |
| 196 | if (nfile > 1 && hflag) printf("%s:", file); |
| 197 | if (bflag) printf("%d:", blkno); |
| 198 | if (nflag) printf("%ld:", lnum); |
| 199 | if (p <= nlp) { |
| 200 | while (nlp < &buf[1024]) putchar(*nlp++); |
| 201 | nlp = buf; |
| 202 | } |
| 203 | while (nlp < p) putchar(*nlp++); |
| 204 | } |
| 205 | } |
| 206 | nogood: lnum++; |
| 207 | nlp = p; |
| 208 | c = w; |
| 209 | failed = 0; |
| 210 | continue; |
| 211 | } |
| 212 | if (*p++ == '\n') |
| 213 | if (vflag) goto succeed; |
| 214 | else { |
| 215 | lnum++; |
| 216 | nlp = p; |
| 217 | c = w; |
| 218 | failed = 0; |
| 219 | } |
| 220 | } |
| 221 | close(f); |
| 222 | if (cflag) { |
| 223 | if (nfile > 1) |
| 224 | printf("%s:", file); |
| 225 | printf("%ld\n", tln); |
| 226 | } |
| 227 | } |
| 228 | |
| 229 | getargc() |
| 230 | { |
| 231 | register c; |
| 232 | if (wordf) |
| 233 | return(getc(wordf)); |
| 234 | if ((c = *argptr++) == '\0') |
| 235 | return(EOF); |
| 236 | return(c); |
| 237 | } |
| 238 | |
| 239 | cgotofn() { |
| 240 | register c; |
| 241 | register struct words *s; |
| 242 | |
| 243 | s = smax = w; |
| 244 | nword: for(;;) { |
| 245 | c = getargc(); |
| 246 | if (c==EOF) |
| 247 | return; |
| 248 | if (c == '\n') { |
| 249 | if (xflag) { |
| 250 | for(;;) { |
| 251 | if (s->inp == c) { |
| 252 | s = s->nst; |
| 253 | break; |
| 254 | } |
| 255 | if (s->inp == 0) goto nenter; |
| 256 | if (s->link == 0) { |
| 257 | if (smax >= &w[MAXSIZ -1]) overflo(); |
| 258 | s->link = ++smax; |
| 259 | s = smax; |
| 260 | goto nenter; |
| 261 | } |
| 262 | s = s->link; |
| 263 | } |
| 264 | } |
| 265 | s->out = 1; |
| 266 | s = w; |
| 267 | } else { |
| 268 | loop: if (s->inp == c) { |
| 269 | s = s->nst; |
| 270 | continue; |
| 271 | } |
| 272 | if (s->inp == 0) goto enter; |
| 273 | if (s->link == 0) { |
| 274 | if (smax >= &w[MAXSIZ - 1]) overflo(); |
| 275 | s->link = ++smax; |
| 276 | s = smax; |
| 277 | goto enter; |
| 278 | } |
| 279 | s = s->link; |
| 280 | goto loop; |
| 281 | } |
| 282 | } |
| 283 | |
| 284 | enter: |
| 285 | do { |
| 286 | s->inp = c; |
| 287 | if (smax >= &w[MAXSIZ - 1]) overflo(); |
| 288 | s->nst = ++smax; |
| 289 | s = smax; |
| 290 | } while ((c = getargc()) != '\n' && c!=EOF); |
| 291 | if (xflag) { |
| 292 | nenter: s->inp = '\n'; |
| 293 | if (smax >= &w[MAXSIZ -1]) overflo(); |
| 294 | s->nst = ++smax; |
| 295 | } |
| 296 | smax->out = 1; |
| 297 | s = w; |
| 298 | if (c != EOF) |
| 299 | goto nword; |
| 300 | } |
| 301 | |
| 302 | overflo() { |
| 303 | fprintf(stderr, "wordlist too large\n"); |
| 304 | exit(2); |
| 305 | } |
| 306 | cfail() { |
| 307 | struct words *queue[QSIZE]; |
| 308 | struct words **front, **rear; |
| 309 | struct words *state; |
| 310 | register char c; |
| 311 | register struct words *s; |
| 312 | s = w; |
| 313 | front = rear = queue; |
| 314 | init: if ((s->inp) != 0) { |
| 315 | *rear++ = s->nst; |
| 316 | if (rear >= &queue[QSIZE - 1]) overflo(); |
| 317 | } |
| 318 | if ((s = s->link) != 0) { |
| 319 | goto init; |
| 320 | } |
| 321 | |
| 322 | while (rear!=front) { |
| 323 | s = *front; |
| 324 | if (front == &queue[QSIZE-1]) |
| 325 | front = queue; |
| 326 | else front++; |
| 327 | cloop: if ((c = s->inp) != 0) { |
| 328 | *rear = (q = s->nst); |
| 329 | if (front < rear) |
| 330 | if (rear >= &queue[QSIZE-1]) |
| 331 | if (front == queue) overflo(); |
| 332 | else rear = queue; |
| 333 | else rear++; |
| 334 | else |
| 335 | if (++rear == front) overflo(); |
| 336 | state = s->fail; |
| 337 | floop: if (state == 0) state = w; |
| 338 | if (state->inp == c) { |
| 339 | q->fail = state->nst; |
| 340 | if ((state->nst)->out == 1) q->out = 1; |
| 341 | continue; |
| 342 | } |
| 343 | else if ((state = state->link) != 0) |
| 344 | goto floop; |
| 345 | } |
| 346 | if ((s = s->link) != 0) |
| 347 | goto cloop; |
| 348 | } |
| 349 | } |