| 1 |
/*************************************************
|
| 2 |
* pcregrep program *
|
| 3 |
*************************************************/
|
| 4 |
|
| 5 |
/* This is a grep program that uses the PCRE regular expression library to do
|
| 6 |
its pattern matching. On a Unix system it can recurse into directories. */
|
| 7 |
|
| 8 |
#include <ctype.h>
|
| 9 |
#include <stdio.h>
|
| 10 |
#include <string.h>
|
| 11 |
#include <stdlib.h>
|
| 12 |
#include <errno.h>
|
| 13 |
#include "config.h"
|
| 14 |
#include "pcre.h"
|
| 15 |
|
| 16 |
#define FALSE 0
|
| 17 |
#define TRUE 1
|
| 18 |
|
| 19 |
typedef int BOOL;
|
| 20 |
|
| 21 |
#define VERSION "2.0 01-Aug-2001"
|
| 22 |
#define MAX_PATTERN_COUNT 100
|
| 23 |
|
| 24 |
|
| 25 |
/*************************************************
|
| 26 |
* Global variables *
|
| 27 |
*************************************************/
|
| 28 |
|
| 29 |
static char *pattern_filename = NULL;
|
| 30 |
static int pattern_count = 0;
|
| 31 |
static pcre **pattern_list;
|
| 32 |
static pcre_extra **hints_list;
|
| 33 |
|
| 34 |
static BOOL count_only = FALSE;
|
| 35 |
static BOOL filenames = TRUE;
|
| 36 |
static BOOL filenames_only = FALSE;
|
| 37 |
static BOOL invert = FALSE;
|
| 38 |
static BOOL number = FALSE;
|
| 39 |
static BOOL recurse = FALSE;
|
| 40 |
static BOOL silent = FALSE;
|
| 41 |
static BOOL whole_lines = FALSE;
|
| 42 |
|
| 43 |
/* Structure for options and list of them */
|
| 44 |
|
| 45 |
typedef struct option_item {
|
| 46 |
int one_char;
|
| 47 |
char *long_name;
|
| 48 |
char *help_text;
|
| 49 |
} option_item;
|
| 50 |
|
| 51 |
static option_item optionlist[] = {
|
| 52 |
{ -1, "help", "display this help and exit" },
|
| 53 |
{ 'c', "count", "print only a count of matching lines per FILE" },
|
| 54 |
{ 'h', "no-filename", "suppress the prefixing filename on output" },
|
| 55 |
{ 'i', "ignore-case", "ignore case distinctions" },
|
| 56 |
{ 'l', "files-with-matches", "print only FILE names containing matches" },
|
| 57 |
{ 'n', "line-number", "print line number with output lines" },
|
| 58 |
{ 'r', "recursive", "recursively scan sub-directories" },
|
| 59 |
{ 's', "no-messages", "suppress error messages" },
|
| 60 |
{ 'V', "version", "print version information and exit" },
|
| 61 |
{ 'v', "invert-match", "select non-matching lines" },
|
| 62 |
{ 'x', "line-regex", "force PATTERN to match only whole lines" },
|
| 63 |
{ 'x', "line-regexp", "force PATTERN to match only whole lines" },
|
| 64 |
{ 0, NULL, NULL }
|
| 65 |
};
|
| 66 |
|
| 67 |
|
| 68 |
/*************************************************
|
| 69 |
* Functions for directory scanning *
|
| 70 |
*************************************************/
|
| 71 |
|
| 72 |
/* These functions are defined so that they can be made system specific,
|
| 73 |
although at present the only ones are for Unix, and for "no directory recursion
|
| 74 |
support". */
|
| 75 |
|
| 76 |
|
| 77 |
/************* Directory scanning in Unix ***********/
|
| 78 |
|
| 79 |
#if IS_UNIX
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| 80 |
#include <sys/types.h>
|
| 81 |
#include <sys/stat.h>
|
| 82 |
#include <dirent.h>
|
| 83 |
|
| 84 |
typedef DIR directory_type;
|
| 85 |
|
| 86 |
int
|
| 87 |
isdirectory(char *filename)
|
| 88 |
{
|
| 89 |
struct stat statbuf;
|
| 90 |
if (stat(filename, &statbuf) < 0)
|
| 91 |
return 0; /* In the expectation that opening as a file will fail */
|
| 92 |
return ((statbuf.st_mode & S_IFMT) == S_IFDIR)? '/' : 0;
|
| 93 |
}
|
| 94 |
|
| 95 |
directory_type *
|
| 96 |
opendirectory(char *filename)
|
| 97 |
{
|
| 98 |
return opendir(filename);
|
| 99 |
}
|
| 100 |
|
| 101 |
char *
|
| 102 |
readdirectory(directory_type *dir)
|
| 103 |
{
|
| 104 |
for (;;)
|
| 105 |
{
|
| 106 |
struct dirent *dent = readdir(dir);
|
| 107 |
if (dent == NULL) return NULL;
|
| 108 |
if (strcmp(dent->d_name, ".") != 0 && strcmp(dent->d_name, "..") != 0)
|
| 109 |
return dent->d_name;
|
| 110 |
}
|
| 111 |
return NULL; /* Keep compiler happy; never executed */
|
| 112 |
}
|
| 113 |
|
| 114 |
void
|
| 115 |
closedirectory(directory_type *dir)
|
| 116 |
{
|
| 117 |
closedir(dir);
|
| 118 |
}
|
| 119 |
|
| 120 |
|
| 121 |
#else
|
| 122 |
|
| 123 |
|
| 124 |
/************* Directory scanning when we can't do it ***********/
|
| 125 |
|
| 126 |
/* The type is void, and apart from isdirectory(), the functions do nothing. */
|
| 127 |
|
| 128 |
typedef void directory_type;
|
| 129 |
|
| 130 |
int isdirectory(char *filename) { return FALSE; }
|
| 131 |
directory_type * opendirectory(char *filename) {}
|
| 132 |
char *readdirectory(directory_type *dir) {}
|
| 133 |
void closedirectory(directory_type *dir) {}
|
| 134 |
|
| 135 |
#endif
|
| 136 |
|
| 137 |
|
| 138 |
|
| 139 |
#if ! HAVE_STRERROR
|
| 140 |
/*************************************************
|
| 141 |
* Provide strerror() for non-ANSI libraries *
|
| 142 |
*************************************************/
|
| 143 |
|
| 144 |
/* Some old-fashioned systems still around (e.g. SunOS4) don't have strerror()
|
| 145 |
in their libraries, but can provide the same facility by this simple
|
| 146 |
alternative function. */
|
| 147 |
|
| 148 |
extern int sys_nerr;
|
| 149 |
extern char *sys_errlist[];
|
| 150 |
|
| 151 |
char *
|
| 152 |
strerror(int n)
|
| 153 |
{
|
| 154 |
if (n < 0 || n >= sys_nerr) return "unknown error number";
|
| 155 |
return sys_errlist[n];
|
| 156 |
}
|
| 157 |
#endif /* HAVE_STRERROR */
|
| 158 |
|
| 159 |
|
| 160 |
|
| 161 |
/*************************************************
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| 162 |
* Grep an individual file *
|
| 163 |
*************************************************/
|
| 164 |
|
| 165 |
static int
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| 166 |
pcregrep(FILE *in, char *name)
|
| 167 |
{
|
| 168 |
int rc = 1;
|
| 169 |
int linenumber = 0;
|
| 170 |
int count = 0;
|
| 171 |
int offsets[99];
|
| 172 |
char buffer[BUFSIZ];
|
| 173 |
|
| 174 |
while (fgets(buffer, sizeof(buffer), in) != NULL)
|
| 175 |
{
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| 176 |
BOOL match = FALSE;
|
| 177 |
int i;
|
| 178 |
int length = (int)strlen(buffer);
|
| 179 |
if (length > 0 && buffer[length-1] == '\n') buffer[--length] = 0;
|
| 180 |
linenumber++;
|
| 181 |
|
| 182 |
for (i = 0; !match && i < pattern_count; i++)
|
| 183 |
{
|
| 184 |
match = pcre_exec(pattern_list[i], hints_list[i], buffer, length, 0, 0,
|
| 185 |
offsets, 99) >= 0;
|
| 186 |
if (match && whole_lines && offsets[1] != length) match = FALSE;
|
| 187 |
}
|
| 188 |
|
| 189 |
if (match != invert)
|
| 190 |
{
|
| 191 |
if (count_only) count++;
|
| 192 |
|
| 193 |
else if (filenames_only)
|
| 194 |
{
|
| 195 |
fprintf(stdout, "%s\n", (name == NULL)? "<stdin>" : name);
|
| 196 |
return 0;
|
| 197 |
}
|
| 198 |
|
| 199 |
else if (silent) return 0;
|
| 200 |
|
| 201 |
else
|
| 202 |
{
|
| 203 |
if (name != NULL) fprintf(stdout, "%s:", name);
|
| 204 |
if (number) fprintf(stdout, "%d:", linenumber);
|
| 205 |
fprintf(stdout, "%s\n", buffer);
|
| 206 |
}
|
| 207 |
|
| 208 |
rc = 0;
|
| 209 |
}
|
| 210 |
}
|
| 211 |
|
| 212 |
if (count_only)
|
| 213 |
{
|
| 214 |
if (name != NULL) fprintf(stdout, "%s:", name);
|
| 215 |
fprintf(stdout, "%d\n", count);
|
| 216 |
}
|
| 217 |
|
| 218 |
return rc;
|
| 219 |
}
|
| 220 |
|
| 221 |
|
| 222 |
|
| 223 |
|
| 224 |
/*************************************************
|
| 225 |
* Grep a file or recurse into a directory *
|
| 226 |
*************************************************/
|
| 227 |
|
| 228 |
static int
|
| 229 |
grep_or_recurse(char *filename, BOOL recurse, BOOL show_filenames,
|
| 230 |
BOOL only_one_at_top)
|
| 231 |
{
|
| 232 |
int rc = 1;
|
| 233 |
int sep;
|
| 234 |
FILE *in;
|
| 235 |
|
| 236 |
/* If the file is a directory and we are recursing, scan each file within it.
|
| 237 |
The scanning code is localized so it can be made system-specific. */
|
| 238 |
|
| 239 |
if ((sep = isdirectory(filename)) != 0 && recurse)
|
| 240 |
{
|
| 241 |
char buffer[1024];
|
| 242 |
char *nextfile;
|
| 243 |
directory_type *dir = opendirectory(filename);
|
| 244 |
|
| 245 |
if (dir == NULL)
|
| 246 |
{
|
| 247 |
fprintf(stderr, "pcregrep: Failed to open directory %s: %s\n", filename,
|
| 248 |
strerror(errno));
|
| 249 |
return 2;
|
| 250 |
}
|
| 251 |
|
| 252 |
while ((nextfile = readdirectory(dir)) != NULL)
|
| 253 |
{
|
| 254 |
int frc;
|
| 255 |
sprintf(buffer, "%.512s%c%.128s", filename, sep, nextfile);
|
| 256 |
frc = grep_or_recurse(buffer, recurse, TRUE, FALSE);
|
| 257 |
if (frc == 0 && rc == 1) rc = 0;
|
| 258 |
}
|
| 259 |
|
| 260 |
closedirectory(dir);
|
| 261 |
return rc;
|
| 262 |
}
|
| 263 |
|
| 264 |
/* If the file is not a directory, or we are not recursing, scan it. If this is
|
| 265 |
the first and only argument at top level, we don't show the file name.
|
| 266 |
Otherwise, control is via the show_filenames variable. */
|
| 267 |
|
| 268 |
in = fopen(filename, "r");
|
| 269 |
if (in == NULL)
|
| 270 |
{
|
| 271 |
fprintf(stderr, "pcregrep: Failed to open %s: %s\n", filename, strerror(errno));
|
| 272 |
return 2;
|
| 273 |
}
|
| 274 |
|
| 275 |
rc = pcregrep(in, (show_filenames && !only_one_at_top)? filename : NULL);
|
| 276 |
fclose(in);
|
| 277 |
return rc;
|
| 278 |
}
|
| 279 |
|
| 280 |
|
| 281 |
|
| 282 |
|
| 283 |
/*************************************************
|
| 284 |
* Usage function *
|
| 285 |
*************************************************/
|
| 286 |
|
| 287 |
static int
|
| 288 |
usage(int rc)
|
| 289 |
{
|
| 290 |
fprintf(stderr, "Usage: pcregrep [-Vcfhilnrsvx] [long-options] pattern [file] ...\n");
|
| 291 |
fprintf(stderr, "Type `pcregrep --help' for more information.\n");
|
| 292 |
return rc;
|
| 293 |
}
|
| 294 |
|
| 295 |
|
| 296 |
|
| 297 |
|
| 298 |
/*************************************************
|
| 299 |
* Help function *
|
| 300 |
*************************************************/
|
| 301 |
|
| 302 |
static void
|
| 303 |
help(void)
|
| 304 |
{
|
| 305 |
option_item *op;
|
| 306 |
|
| 307 |
printf("Usage: pcregrep [OPTION]... PATTERN [FILE] ...\n");
|
| 308 |
printf("Search for PATTERN in each FILE or standard input.\n");
|
| 309 |
printf("Example: pcregrep -i 'hello.*world' menu.h main.c\n\n");
|
| 310 |
|
| 311 |
printf("Options:\n");
|
| 312 |
|
| 313 |
for (op = optionlist; op->one_char != 0; op++)
|
| 314 |
{
|
| 315 |
int n;
|
| 316 |
char s[4];
|
| 317 |
if (op->one_char > 0) sprintf(s, "-%c,", op->one_char); else strcpy(s, " ");
|
| 318 |
printf(" %s --%s%n", s, op->long_name, &n);
|
| 319 |
n = 30 - n;
|
| 320 |
if (n < 1) n = 1;
|
| 321 |
printf("%.*s%s\n", n, " ", op->help_text);
|
| 322 |
}
|
| 323 |
|
| 324 |
printf("\n -f<filename> or --file=<filename>\n");
|
| 325 |
printf(" Read patterns from <filename> instead of using a command line option.\n");
|
| 326 |
printf(" Trailing white space is removed; blanks lines are ignored.\n");
|
| 327 |
printf(" There is a maximum of %d patterns.\n", MAX_PATTERN_COUNT);
|
| 328 |
|
| 329 |
printf("\nWith no FILE, read standard input. If fewer than two FILEs given, assume -h.\n");
|
| 330 |
printf("Exit status is 0 if any matches, 1 if no matches, and 2 if trouble.\n");
|
| 331 |
}
|
| 332 |
|
| 333 |
|
| 334 |
|
| 335 |
|
| 336 |
/*************************************************
|
| 337 |
* Handle an option *
|
| 338 |
*************************************************/
|
| 339 |
|
| 340 |
static int
|
| 341 |
handle_option(int letter, int options)
|
| 342 |
{
|
| 343 |
switch(letter)
|
| 344 |
{
|
| 345 |
case -1: help(); exit(0);
|
| 346 |
case 'c': count_only = TRUE; break;
|
| 347 |
case 'h': filenames = FALSE; break;
|
| 348 |
case 'i': options |= PCRE_CASELESS; break;
|
| 349 |
case 'l': filenames_only = TRUE;
|
| 350 |
case 'n': number = TRUE; break;
|
| 351 |
case 'r': recurse = TRUE; break;
|
| 352 |
case 's': silent = TRUE; break;
|
| 353 |
case 'v': invert = TRUE; break;
|
| 354 |
case 'x': whole_lines = TRUE; options |= PCRE_ANCHORED; break;
|
| 355 |
|
| 356 |
case 'V':
|
| 357 |
fprintf(stderr, "pcregrep version %s using ", VERSION);
|
| 358 |
fprintf(stderr, "PCRE version %s\n", pcre_version());
|
| 359 |
exit(0);
|
| 360 |
break;
|
| 361 |
|
| 362 |
default:
|
| 363 |
fprintf(stderr, "pcregrep: Unknown option -%c\n", letter);
|
| 364 |
exit(usage(2));
|
| 365 |
}
|
| 366 |
|
| 367 |
return options;
|
| 368 |
}
|
| 369 |
|
| 370 |
|
| 371 |
|
| 372 |
|
| 373 |
/*************************************************
|
| 374 |
* Main program *
|
| 375 |
*************************************************/
|
| 376 |
|
| 377 |
int
|
| 378 |
main(int argc, char **argv)
|
| 379 |
{
|
| 380 |
int i, j;
|
| 381 |
int rc = 1;
|
| 382 |
int options = 0;
|
| 383 |
int errptr;
|
| 384 |
const char *error;
|
| 385 |
BOOL only_one_at_top;
|
| 386 |
|
| 387 |
/* Process the options */
|
| 388 |
|
| 389 |
for (i = 1; i < argc; i++)
|
| 390 |
{
|
| 391 |
if (argv[i][0] != '-') break;
|
| 392 |
|
| 393 |
/* Long name options */
|
| 394 |
|
| 395 |
if (argv[i][1] == '-')
|
| 396 |
{
|
| 397 |
option_item *op;
|
| 398 |
|
| 399 |
if (strncmp(argv[i]+2, "file=", 5) == 0)
|
| 400 |
{
|
| 401 |
pattern_filename = argv[i] + 7;
|
| 402 |
continue;
|
| 403 |
}
|
| 404 |
|
| 405 |
for (op = optionlist; op->one_char != 0; op++)
|
| 406 |
{
|
| 407 |
if (strcmp(argv[i]+2, op->long_name) == 0)
|
| 408 |
{
|
| 409 |
options = handle_option(op->one_char, options);
|
| 410 |
break;
|
| 411 |
}
|
| 412 |
}
|
| 413 |
if (op->one_char == 0)
|
| 414 |
{
|
| 415 |
fprintf(stderr, "pcregrep: Unknown option %s\n", argv[i]);
|
| 416 |
exit(usage(2));
|
| 417 |
}
|
| 418 |
}
|
| 419 |
|
| 420 |
/* One-char options */
|
| 421 |
|
| 422 |
else
|
| 423 |
{
|
| 424 |
char *s = argv[i] + 1;
|
| 425 |
while (*s != 0)
|
| 426 |
{
|
| 427 |
if (*s == 'f')
|
| 428 |
{
|
| 429 |
pattern_filename = s + 1;
|
| 430 |
if (pattern_filename[0] == 0)
|
| 431 |
{
|
| 432 |
if (i >= argc - 1)
|
| 433 |
{
|
| 434 |
fprintf(stderr, "pcregrep: File name missing after -f\n");
|
| 435 |
exit(usage(2));
|
| 436 |
}
|
| 437 |
pattern_filename = argv[++i];
|
| 438 |
}
|
| 439 |
break;
|
| 440 |
}
|
| 441 |
else options = handle_option(*s++, options);
|
| 442 |
}
|
| 443 |
}
|
| 444 |
}
|
| 445 |
|
| 446 |
pattern_list = malloc(MAX_PATTERN_COUNT * sizeof(pcre *));
|
| 447 |
hints_list = malloc(MAX_PATTERN_COUNT * sizeof(pcre_extra *));
|
| 448 |
|
| 449 |
if (pattern_list == NULL || hints_list == NULL)
|
| 450 |
{
|
| 451 |
fprintf(stderr, "pcregrep: malloc failed\n");
|
| 452 |
return 2;
|
| 453 |
}
|
| 454 |
|
| 455 |
/* Compile the regular expression(s). */
|
| 456 |
|
| 457 |
if (pattern_filename != NULL)
|
| 458 |
{
|
| 459 |
FILE *f = fopen(pattern_filename, "r");
|
| 460 |
char buffer[BUFSIZ];
|
| 461 |
if (f == NULL)
|
| 462 |
{
|
| 463 |
fprintf(stderr, "pcregrep: Failed to open %s: %s\n", pattern_filename,
|
| 464 |
strerror(errno));
|
| 465 |
return 2;
|
| 466 |
}
|
| 467 |
while (fgets(buffer, sizeof(buffer), f) != NULL)
|
| 468 |
{
|
| 469 |
char *s = buffer + (int)strlen(buffer);
|
| 470 |
if (pattern_count >= MAX_PATTERN_COUNT)
|
| 471 |
{
|
| 472 |
fprintf(stderr, "pcregrep: Too many patterns in file (max %d)\n",
|
| 473 |
MAX_PATTERN_COUNT);
|
| 474 |
return 2;
|
| 475 |
}
|
| 476 |
while (s > buffer && isspace((unsigned char)(s[-1]))) s--;
|
| 477 |
if (s == buffer) continue;
|
| 478 |
*s = 0;
|
| 479 |
pattern_list[pattern_count] = pcre_compile(buffer, options, &error,
|
| 480 |
&errptr, NULL);
|
| 481 |
if (pattern_list[pattern_count++] == NULL)
|
| 482 |
{
|
| 483 |
fprintf(stderr, "pcregrep: Error in regex number %d at offset %d: %s\n",
|
| 484 |
pattern_count, errptr, error);
|
| 485 |
return 2;
|
| 486 |
}
|
| 487 |
}
|
| 488 |
fclose(f);
|
| 489 |
}
|
| 490 |
|
| 491 |
/* If no file name, a single regex must be given inline */
|
| 492 |
|
| 493 |
else
|
| 494 |
{
|
| 495 |
if (i >= argc) return usage(0);
|
| 496 |
pattern_list[0] = pcre_compile(argv[i++], options, &error, &errptr, NULL);
|
| 497 |
if (pattern_list[0] == NULL)
|
| 498 |
{
|
| 499 |
fprintf(stderr, "pcregrep: Error in regex at offset %d: %s\n", errptr,
|
| 500 |
error);
|
| 501 |
return 2;
|
| 502 |
}
|
| 503 |
pattern_count++;
|
| 504 |
}
|
| 505 |
|
| 506 |
/* Study the regular expressions, as we will be running them may times */
|
| 507 |
|
| 508 |
for (j = 0; j < pattern_count; j++)
|
| 509 |
{
|
| 510 |
hints_list[j] = pcre_study(pattern_list[j], 0, &error);
|
| 511 |
if (error != NULL)
|
| 512 |
{
|
| 513 |
char s[16];
|
| 514 |
if (pattern_count == 1) s[0] = 0; else sprintf(s, " number %d", j);
|
| 515 |
fprintf(stderr, "pcregrep: Error while studying regex%s: %s\n", s, error);
|
| 516 |
return 2;
|
| 517 |
}
|
| 518 |
}
|
| 519 |
|
| 520 |
/* If there are no further arguments, do the business on stdin and exit */
|
| 521 |
|
| 522 |
if (i >= argc) return pcregrep(stdin, NULL);
|
| 523 |
|
| 524 |
/* Otherwise, work through the remaining arguments as files or directories.
|
| 525 |
Pass in the fact that there is only one argument at top level - this suppresses
|
| 526 |
the file name if the argument is not a directory. */
|
| 527 |
|
| 528 |
only_one_at_top = (i == argc - 1);
|
| 529 |
if (filenames_only) filenames = TRUE;
|
| 530 |
|
| 531 |
for (; i < argc; i++)
|
| 532 |
{
|
| 533 |
int frc = grep_or_recurse(argv[i], recurse, filenames, only_one_at_top);
|
| 534 |
if (frc == 0 && rc == 1) rc = 0;
|
| 535 |
}
|
| 536 |
|
| 537 |
return rc;
|
| 538 |
}
|
| 539 |
|
| 540 |
/* End */
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