1 /* vi: set sw=4 ts=4: */
3 * Mini grep implementation for busybox using libc regex.
5 * Copyright (C) 1999,2000,2001 by Lineo, inc. and Mark Whitley
6 * Copyright (C) 1999,2000,2001 by Mark Whitley <markw@codepoet.org>
8 * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
10 /* BB_AUDIT SUSv3 defects - unsupported option -x. */
11 /* BB_AUDIT GNU defects - always acts as -a. */
12 /* http://www.opengroup.org/onlinepubs/007904975/utilities/grep.html */
14 * 2004,2006 (C) Vladimir Oleynik <dzo@simtreas.ru> -
15 * correction "-e pattern1 -e pattern2" logic and more optimizations.
19 * (C) 2006 Jac Goudsmit added -o option
27 #define GREP_OPTS "lnqvscFiHhe:f:Lor"
28 #define GREP_OPT_l (1<<0)
29 #define PRINT_FILES_WITH_MATCHES (option_mask32 & GREP_OPT_l)
30 #define GREP_OPT_n (1<<1)
31 #define PRINT_LINE_NUM (option_mask32 & GREP_OPT_n)
32 #define GREP_OPT_q (1<<2)
33 #define BE_QUIET (option_mask32 & GREP_OPT_q)
34 #define GREP_OPT_v (1<<3)
35 #define GREP_OPT_s (1<<4)
36 #define SUPPRESS_ERR_MSGS (option_mask32 & GREP_OPT_s)
37 #define GREP_OPT_c (1<<5)
38 #define PRINT_MATCH_COUNTS (option_mask32 & GREP_OPT_c)
39 #define GREP_OPT_F (1<<6)
40 #define FGREP_FLAG (option_mask32 & GREP_OPT_F)
41 #define GREP_OPT_i (1<<7)
42 #define GREP_OPT_H (1<<8)
43 #define GREP_OPT_h (1<<9)
44 #define GREP_OPT_e (1<<10)
45 #define GREP_OPT_f (1<<11)
46 #define GREP_OPT_L (1<<12)
47 #define PRINT_FILES_WITHOUT_MATCHES (option_mask32 & GREP_OPT_L)
48 #define GREP_OPT_o (1<<13)
49 #define GREP_OPT_r (1<<14)
50 #if ENABLE_FEATURE_GREP_CONTEXT
51 # define GREP_OPT_CONTEXT "A:B:C:"
52 # define GREP_OPT_A (1<<15)
53 # define GREP_OPT_B (1<<16)
54 # define GREP_OPT_C (1<<17)
55 # define GREP_OPT_E (1<<18)
57 # define GREP_OPT_CONTEXT ""
61 # define GREP_OPT_E (1<<15)
63 #if ENABLE_FEATURE_GREP_EGREP_ALIAS
64 # define OPT_EGREP "E"
69 typedef unsigned char byte_t;
72 static byte_t invert_search;
73 static byte_t print_filename;
74 static byte_t open_errors;
76 #if ENABLE_FEATURE_GREP_CONTEXT
77 static int lines_before;
78 static int lines_after;
79 static char **before_buf;
80 static int last_line_printed;
81 #endif /* ENABLE_FEATURE_GREP_CONTEXT */
83 /* globals used internally */
84 static llist_t *pattern_head; /* growable list of patterns to match */
85 static const char *cur_file; /* the current file we are reading */
87 typedef struct GREP_LIST_DATA {
90 #define PATTERN_MEM_A 1
92 int flg_mem_alocated_compiled;
95 static void print_line(const char *line, int linenum, char decoration)
97 #if ENABLE_FEATURE_GREP_CONTEXT
98 /* possibly print the little '--' separator */
99 if ((lines_before || lines_after) && last_line_printed &&
100 last_line_printed < linenum - 1) {
103 last_line_printed = linenum;
106 printf("%s%c", cur_file, decoration);
108 printf("%i%c", linenum, decoration);
109 /* Emulate weird GNU grep behavior with -ov */
110 if ((option_mask32 & (GREP_OPT_v+GREP_OPT_o)) != (GREP_OPT_v+GREP_OPT_o))
115 static int grep_file(FILE *file)
122 #if ENABLE_FEATURE_GREP_CONTEXT
123 int print_n_lines_after = 0;
124 int curpos = 0; /* track where we are in the circular 'before' buffer */
125 int idx = 0; /* used for iteration through the circular buffer */
126 #endif /* ENABLE_FEATURE_GREP_CONTEXT */
128 while ((line = xmalloc_getline(file)) != NULL) {
129 llist_t *pattern_ptr = pattern_head;
130 grep_list_data_t * gl;
134 while (pattern_ptr) {
135 gl = (grep_list_data_t *)pattern_ptr->data;
137 ret = strstr(line, gl->pattern) != NULL;
140 * test for a postitive-assertion match (regexec returns success (0)
141 * and the user did not specify invert search), or a negative-assertion
142 * match (regexec returns failure (REG_NOMATCH) and the user specified
145 if (!(gl->flg_mem_alocated_compiled & COMPILED)) {
146 gl->flg_mem_alocated_compiled |= COMPILED;
147 xregcomp(&(gl->preg), gl->pattern, reflags);
151 ret |= regexec(&(gl->preg), line, 1, ®match, 0) == 0;
153 pattern_ptr = pattern_ptr->link;
154 } /* while (pattern_ptr) */
156 if (ret ^ invert_search) {
158 if (PRINT_FILES_WITH_MATCHES || BE_QUIET)
161 /* if we found a match but were told to be quiet, stop here */
162 if (BE_QUIET || PRINT_FILES_WITHOUT_MATCHES)
165 /* keep track of matches */
168 /* if we're just printing filenames, we stop after the first match */
169 if (PRINT_FILES_WITH_MATCHES)
172 /* print the matched line */
173 if (PRINT_MATCH_COUNTS == 0) {
174 #if ENABLE_FEATURE_GREP_CONTEXT
175 int prevpos = (curpos == 0) ? lines_before - 1 : curpos - 1;
177 /* if we were told to print 'before' lines and there is at least
178 * one line in the circular buffer, print them */
179 if (lines_before && before_buf[prevpos] != NULL) {
180 int first_buf_entry_line_num = linenum - lines_before;
182 /* advance to the first entry in the circular buffer, and
183 * figure out the line number is of the first line in the
186 while (before_buf[idx] == NULL) {
187 idx = (idx + 1) % lines_before;
188 first_buf_entry_line_num++;
191 /* now print each line in the buffer, clearing them as we go */
192 while (before_buf[idx] != NULL) {
193 print_line(before_buf[idx], first_buf_entry_line_num, '-');
194 free(before_buf[idx]);
195 before_buf[idx] = NULL;
196 idx = (idx + 1) % lines_before;
197 first_buf_entry_line_num++;
201 /* make a note that we need to print 'after' lines */
202 print_n_lines_after = lines_after;
204 if (option_mask32 & GREP_OPT_o) {
205 line[regmatch.rm_eo] = '\0';
206 print_line(line + regmatch.rm_so, linenum, ':');
208 print_line(line, linenum, ':');
212 #if ENABLE_FEATURE_GREP_CONTEXT
213 else { /* no match */
214 /* Add the line to the circular 'before' buffer */
216 free(before_buf[curpos]);
217 before_buf[curpos] = xstrdup(line);
218 curpos = (curpos + 1) % lines_before;
222 /* if we need to print some context lines after the last match, do so */
223 if (print_n_lines_after && (last_line_printed != linenum)) {
224 print_line(line, linenum, '-');
225 print_n_lines_after--;
227 #endif /* ENABLE_FEATURE_GREP_CONTEXT */
231 /* special-case file post-processing for options where we don't print line
232 * matches, just filenames and possibly match counts */
234 /* grep -c: print [filename:]count, even if count is zero */
235 if (PRINT_MATCH_COUNTS) {
237 printf("%s:", cur_file);
238 printf("%d\n", nmatches);
241 /* grep -l: print just the filename, but only if we grepped the line in the file */
242 if (PRINT_FILES_WITH_MATCHES && nmatches > 0) {
246 /* grep -L: print just the filename, but only if we didn't grep the line in the file */
247 if (PRINT_FILES_WITHOUT_MATCHES && nmatches == 0) {
254 #if ENABLE_FEATURE_CLEAN_UP
255 #define new_grep_list_data(p, m) add_grep_list_data(p, m)
256 static char * add_grep_list_data(char *pattern, int flg_used_mem)
258 #define new_grep_list_data(p, m) add_grep_list_data(p)
259 static char * add_grep_list_data(char *pattern)
262 grep_list_data_t *gl = xmalloc(sizeof(grep_list_data_t));
263 gl->pattern = pattern;
264 #if ENABLE_FEATURE_CLEAN_UP
265 gl->flg_mem_alocated_compiled = flg_used_mem;
267 gl->flg_mem_alocated_compiled = 0;
273 static void load_regexes_from_file(llist_t *fopt)
280 char *ffile = cur->data;
284 f = xfopen(ffile, "r");
285 while ((line = xmalloc_getline(f)) != NULL) {
286 llist_add_to(&pattern_head,
287 new_grep_list_data(line, PATTERN_MEM_A));
293 static int file_action_grep(const char *filename, struct stat *statbuf, void* matched)
295 FILE *file = fopen(filename, "r");
297 if (!SUPPRESS_ERR_MSGS)
298 bb_perror_msg("%s", cur_file);
303 *(int*)matched += grep_file(file);
308 static int grep_dir(const char *dir)
311 recursive_action(dir,
313 /* followLinks= */ 0,
315 /* fileAction= */ file_action_grep,
316 /* dirAction= */ NULL,
317 /* userData= */ &matched);
322 int grep_main(int argc, char **argv)
326 llist_t *fopt = NULL;
328 /* do normal option parsing */
329 #if ENABLE_FEATURE_GREP_CONTEXT
334 opt_complementary = "H-h:e::f::C-AB";
336 GREP_OPTS GREP_OPT_CONTEXT OPT_EGREP,
337 &pattern_head, &fopt,
338 &slines_after, &slines_before, &Copt);
340 if (option_mask32 & GREP_OPT_C) {
341 /* C option unseted A and B options, but next -A or -B
342 may be ovewrite own option */
343 if (!(option_mask32 & GREP_OPT_A)) /* not overwtited */
345 if (!(option_mask32 & GREP_OPT_B)) /* not overwtited */
346 slines_before = Copt;
347 option_mask32 |= GREP_OPT_A|GREP_OPT_B; /* set for parse now */
349 if (option_mask32 & GREP_OPT_A) {
350 lines_after = xatoi_u(slines_after);
352 if (option_mask32 & GREP_OPT_B) {
353 lines_before = xatoi_u(slines_before);
355 /* sanity checks after parse may be invalid numbers ;-) */
356 if (option_mask32 & (GREP_OPT_c|GREP_OPT_q|GREP_OPT_l|GREP_OPT_L)) {
357 option_mask32 &= ~GREP_OPT_n;
360 } else if (lines_before > 0)
361 before_buf = (char **)xzalloc(lines_before * sizeof(char *));
363 /* with auto sanity checks */
364 opt_complementary = "H-h:e::f::c-n:q-n:l-n";
365 getopt32(argc, argv, GREP_OPTS OPT_EGREP,
366 &pattern_head, &fopt);
368 invert_search = (option_mask32 & GREP_OPT_v) != 0; /* 0 | 1 */
370 if (option_mask32 & GREP_OPT_H)
372 if (option_mask32 & GREP_OPT_h)
374 if (pattern_head != NULL) {
375 /* convert char *argv[] to grep_list_data_t */
378 for (cur = pattern_head; cur; cur = cur->link)
379 cur->data = new_grep_list_data(cur->data, 0);
381 if (option_mask32 & GREP_OPT_f)
382 load_regexes_from_file(fopt);
384 if (ENABLE_FEATURE_GREP_FGREP_ALIAS && applet_name[0] == 'f')
385 option_mask32 |= GREP_OPT_F;
387 if (!(option_mask32 & GREP_OPT_o))
390 if (ENABLE_FEATURE_GREP_EGREP_ALIAS &&
391 (applet_name[0] == 'e' || (option_mask32 & GREP_OPT_E)))
392 reflags |= REG_EXTENDED;
394 if (option_mask32 & GREP_OPT_i)
395 reflags |= REG_ICASE;
400 /* if we didn't get a pattern from a -e and no command file was specified,
401 * argv[optind] should be the pattern. no pattern, no worky */
402 if (pattern_head == NULL) {
406 char *pattern = new_grep_list_data(*argv++, 0);
408 llist_add_to(&pattern_head, pattern);
413 /* argv[(optind)..(argc-1)] should be names of file to grep through. If
414 * there is more than one file to grep, we will print the filenames. */
418 /* If no files were specified, or '-' was specified, take input from
419 * stdin. Otherwise, we grep through all the files specified. */
420 } else if (argc == 0) {
427 if (!cur_file || (*cur_file == '-' && !cur_file[1])) {
428 cur_file = "(standard input)";
430 if (option_mask32 & GREP_OPT_r) {
432 if (stat(cur_file, &st) == 0 && S_ISDIR(st.st_mode)) {
433 if (!(option_mask32 & GREP_OPT_h))
435 matched += grep_dir(cur_file);
439 /* else: fopen(dir) will succeed, but reading won't */
440 file = fopen(cur_file, "r");
442 if (!SUPPRESS_ERR_MSGS)
443 bb_perror_msg("%s", cur_file);
448 matched += grep_file(file);
451 /* we found a match but were told to be quiet, stop here and
455 bb_fclose_nonstdin(file);
458 /* destroy all the elments in the pattern list */
459 if (ENABLE_FEATURE_CLEAN_UP) {
460 while (pattern_head) {
461 llist_t *pattern_head_ptr = pattern_head;
462 grep_list_data_t *gl =
463 (grep_list_data_t *)pattern_head_ptr->data;
465 pattern_head = pattern_head->link;
466 if ((gl->flg_mem_alocated_compiled & PATTERN_MEM_A))
468 if ((gl->flg_mem_alocated_compiled & COMPILED))
469 regfree(&(gl->preg));
470 free(pattern_head_ptr);
473 /* 0 = success, 1 = failed, 2 = error */
474 /* If the -q option is specified, the exit status shall be zero
475 * if an input line is selected, even if an error was detected. */
476 if (BE_QUIET && matched)
480 return !matched; /* invert return value 0 = success, 1 = failed */