| /* vi: set sw=4 ts=4: */ |
| /* |
| * Mini grep implementation for busybox using libc regex. |
| * |
| * Copyright (C) 1999,2000,2001 by Lineo, inc. and Mark Whitley |
| * Copyright (C) 1999,2000,2001 by Mark Whitley <markw@codepoet.org> |
| * |
| * Licensed under the GPL v2, see the file LICENSE in this tarball. |
| */ |
| /* BB_AUDIT SUSv3 defects - unsupported option -x. */ |
| /* BB_AUDIT GNU defects - always acts as -a. */ |
| /* http://www.opengroup.org/onlinepubs/007904975/utilities/grep.html */ |
| /* |
| * 2004,2006 (C) Vladimir Oleynik <dzo@simtreas.ru> - |
| * correction "-e pattern1 -e pattern2" logic and more optimizations. |
| * precompiled regex |
| */ |
| |
| #include "busybox.h" |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <getopt.h> |
| #include <string.h> |
| #include <errno.h> |
| #include "xregex.h" |
| |
| |
| /* options */ |
| static unsigned long opt; |
| #define GREP_OPTS "lnqvscFiHhe:f:L" |
| #define GREP_OPT_l (1<<0) |
| #define PRINT_FILES_WITH_MATCHES (opt & GREP_OPT_l) |
| #define GREP_OPT_n (1<<1) |
| #define PRINT_LINE_NUM (opt & GREP_OPT_n) |
| #define GREP_OPT_q (1<<2) |
| #define BE_QUIET (opt & GREP_OPT_q) |
| #define GREP_OPT_v (1<<3) |
| typedef char invert_search_t; |
| static invert_search_t invert_search; |
| #define GREP_OPT_s (1<<4) |
| #define SUPPRESS_ERR_MSGS (opt & GREP_OPT_s) |
| #define GREP_OPT_c (1<<5) |
| #define PRINT_MATCH_COUNTS (opt & GREP_OPT_c) |
| #define GREP_OPT_F (1<<6) |
| #define FGREP_FLAG (opt & GREP_OPT_F) |
| #define GREP_OPT_i (1<<7) |
| #define GREP_OPT_H (1<<8) |
| #define GREP_OPT_h (1<<9) |
| #define GREP_OPT_e (1<<10) |
| #define GREP_OPT_f (1<<11) |
| #define GREP_OPT_L (1<<12) |
| #define PRINT_FILES_WITHOUT_MATCHES ((opt & GREP_OPT_L) != 0) |
| #if ENABLE_FEATURE_GREP_CONTEXT |
| #define GREP_OPT_CONTEXT "A:B:C" |
| #define GREP_OPT_A (1<<13) |
| #define GREP_OPT_B (1<<14) |
| #define GREP_OPT_C (1<<15) |
| #define GREP_OPT_E (1<<16) |
| #else |
| #define GREP_OPT_CONTEXT "" |
| #define GREP_OPT_A (0) |
| #define GREP_OPT_B (0) |
| #define GREP_OPT_C (0) |
| #define GREP_OPT_E (1<<13) |
| #endif |
| #if ENABLE_FEATURE_GREP_EGREP_ALIAS |
| # define OPT_EGREP "E" |
| #else |
| # define OPT_EGREP "" |
| #endif |
| |
| static int reflags; |
| static int print_filename; |
| |
| #if ENABLE_FEATURE_GREP_CONTEXT |
| static int lines_before; |
| static int lines_after; |
| static char **before_buf; |
| static int last_line_printed; |
| #endif /* ENABLE_FEATURE_GREP_CONTEXT */ |
| |
| /* globals used internally */ |
| static llist_t *pattern_head; /* growable list of patterns to match */ |
| static char *cur_file; /* the current file we are reading */ |
| |
| typedef struct GREP_LIST_DATA { |
| char *pattern; |
| regex_t preg; |
| #define PATTERN_MEM_A 1 |
| #define COMPILED 2 |
| int flg_mem_alocated_compiled; |
| } grep_list_data_t; |
| |
| static void print_line(const char *line, int linenum, char decoration) |
| { |
| #if ENABLE_FEATURE_GREP_CONTEXT |
| /* possibly print the little '--' separator */ |
| if ((lines_before || lines_after) && last_line_printed && |
| last_line_printed < linenum - 1) { |
| puts("--"); |
| } |
| last_line_printed = linenum; |
| #endif |
| if (print_filename > 0) |
| printf("%s%c", cur_file, decoration); |
| if (PRINT_LINE_NUM) |
| printf("%i%c", linenum, decoration); |
| puts(line); |
| } |
| |
| |
| static int grep_file(FILE *file) |
| { |
| char *line; |
| invert_search_t ret; |
| int linenum = 0; |
| int nmatches = 0; |
| #if ENABLE_FEATURE_GREP_CONTEXT |
| int print_n_lines_after = 0; |
| int curpos = 0; /* track where we are in the circular 'before' buffer */ |
| int idx = 0; /* used for iteration through the circular buffer */ |
| #endif /* ENABLE_FEATURE_GREP_CONTEXT */ |
| |
| while ((line = bb_get_chomped_line_from_file(file)) != NULL) { |
| llist_t *pattern_ptr = pattern_head; |
| grep_list_data_t * gl; |
| |
| linenum++; |
| ret = 0; |
| while (pattern_ptr) { |
| gl = (grep_list_data_t *)pattern_ptr->data; |
| if (FGREP_FLAG) { |
| ret = strstr(line, gl->pattern) != NULL; |
| } else { |
| /* |
| * test for a postitive-assertion match (regexec returns success (0) |
| * and the user did not specify invert search), or a negative-assertion |
| * match (regexec returns failure (REG_NOMATCH) and the user specified |
| * invert search) |
| */ |
| if(!(gl->flg_mem_alocated_compiled & COMPILED)) { |
| gl->flg_mem_alocated_compiled |= COMPILED; |
| xregcomp(&(gl->preg), gl->pattern, reflags); |
| } |
| ret |= regexec(&(gl->preg), line, 0, NULL, 0) == 0; |
| } |
| pattern_ptr = pattern_ptr->link; |
| } /* while (pattern_ptr) */ |
| |
| if ((ret ^ invert_search)) { |
| |
| if (PRINT_FILES_WITH_MATCHES || BE_QUIET) |
| free(line); |
| |
| /* if we found a match but were told to be quiet, stop here */ |
| if (BE_QUIET || PRINT_FILES_WITHOUT_MATCHES) |
| return -1; |
| |
| /* keep track of matches */ |
| nmatches++; |
| |
| /* if we're just printing filenames, we stop after the first match */ |
| if (PRINT_FILES_WITH_MATCHES) |
| break; |
| |
| /* print the matched line */ |
| if (PRINT_MATCH_COUNTS == 0) { |
| #if ENABLE_FEATURE_GREP_CONTEXT |
| int prevpos = (curpos == 0) ? lines_before - 1 : curpos - 1; |
| |
| /* if we were told to print 'before' lines and there is at least |
| * one line in the circular buffer, print them */ |
| if (lines_before && before_buf[prevpos] != NULL) { |
| int first_buf_entry_line_num = linenum - lines_before; |
| |
| /* advance to the first entry in the circular buffer, and |
| * figure out the line number is of the first line in the |
| * buffer */ |
| idx = curpos; |
| while (before_buf[idx] == NULL) { |
| idx = (idx + 1) % lines_before; |
| first_buf_entry_line_num++; |
| } |
| |
| /* now print each line in the buffer, clearing them as we go */ |
| while (before_buf[idx] != NULL) { |
| print_line(before_buf[idx], first_buf_entry_line_num, '-'); |
| free(before_buf[idx]); |
| before_buf[idx] = NULL; |
| idx = (idx + 1) % lines_before; |
| first_buf_entry_line_num++; |
| } |
| } |
| |
| /* make a note that we need to print 'after' lines */ |
| print_n_lines_after = lines_after; |
| #endif |
| print_line(line, linenum, ':'); |
| } |
| } |
| #if ENABLE_FEATURE_GREP_CONTEXT |
| else { /* no match */ |
| /* Add the line to the circular 'before' buffer */ |
| if(lines_before) { |
| free(before_buf[curpos]); |
| before_buf[curpos] = bb_xstrdup(line); |
| curpos = (curpos + 1) % lines_before; |
| } |
| } |
| |
| /* if we need to print some context lines after the last match, do so */ |
| if (print_n_lines_after && (last_line_printed != linenum)) { |
| print_line(line, linenum, '-'); |
| print_n_lines_after--; |
| } |
| #endif /* ENABLE_FEATURE_GREP_CONTEXT */ |
| free(line); |
| } |
| |
| |
| /* special-case file post-processing for options where we don't print line |
| * matches, just filenames and possibly match counts */ |
| |
| /* grep -c: print [filename:]count, even if count is zero */ |
| if (PRINT_MATCH_COUNTS) { |
| if (print_filename > 0) |
| printf("%s:", cur_file); |
| printf("%d\n", nmatches); |
| } |
| |
| /* grep -l: print just the filename, but only if we grepped the line in the file */ |
| if (PRINT_FILES_WITH_MATCHES && nmatches > 0) { |
| puts(cur_file); |
| } |
| |
| /* grep -L: print just the filename, but only if we didn't grep the line in the file */ |
| if (PRINT_FILES_WITHOUT_MATCHES && nmatches == 0) { |
| puts(cur_file); |
| } |
| |
| return nmatches; |
| } |
| |
| #if ENABLE_FEATURE_CLEAN_UP |
| #define new_grep_list_data(p, m) add_grep_list_data(p, m) |
| static char * add_grep_list_data(char *pattern, int flg_used_mem) |
| #else |
| #define new_grep_list_data(p, m) add_grep_list_data(p) |
| static char * add_grep_list_data(char *pattern) |
| #endif |
| { |
| grep_list_data_t *gl = xmalloc(sizeof(grep_list_data_t)); |
| gl->pattern = pattern; |
| #if ENABLE_FEATURE_CLEAN_UP |
| gl->flg_mem_alocated_compiled = flg_used_mem; |
| #else |
| gl->flg_mem_alocated_compiled = 0; |
| #endif |
| return (char *)gl; |
| } |
| |
| |
| static void load_regexes_from_file(llist_t *fopt) |
| { |
| char *line; |
| FILE *f; |
| |
| while(fopt) { |
| llist_t *cur = fopt; |
| char *ffile = cur->data; |
| |
| fopt = cur->link; |
| free(cur); |
| f = bb_xfopen(ffile, "r"); |
| while ((line = bb_get_chomped_line_from_file(f)) != NULL) { |
| llist_add_to(&pattern_head, |
| new_grep_list_data(line, PATTERN_MEM_A)); |
| } |
| } |
| } |
| |
| |
| int grep_main(int argc, char **argv) |
| { |
| FILE *file; |
| int matched; |
| llist_t *fopt = NULL; |
| int error_open_count = 0; |
| |
| /* do normal option parsing */ |
| #if ENABLE_FEATURE_GREP_CONTEXT |
| { |
| char *junk; |
| char *slines_after; |
| char *slines_before; |
| char *Copt; |
| |
| bb_opt_complementally = "H-h:e::f::C-AB"; |
| opt = bb_getopt_ulflags(argc, argv, |
| GREP_OPTS GREP_OPT_CONTEXT OPT_EGREP, |
| &pattern_head, &fopt, |
| &slines_after, &slines_before, &Copt); |
| |
| if(opt & GREP_OPT_C) { |
| /* C option unseted A and B options, but next -A or -B |
| may be ovewrite own option */ |
| if(!(opt & GREP_OPT_A)) /* not overwtited */ |
| slines_after = Copt; |
| if(!(opt & GREP_OPT_B)) /* not overwtited */ |
| slines_before = Copt; |
| opt |= GREP_OPT_A|GREP_OPT_B; /* set for parse now */ |
| } |
| if(opt & GREP_OPT_A) { |
| lines_after = strtoul(slines_after, &junk, 10); |
| if(*junk != '\0') |
| bb_error_msg_and_die(bb_msg_invalid_arg, slines_after, "-A"); |
| } |
| if(opt & GREP_OPT_B) { |
| lines_before = strtoul(slines_before, &junk, 10); |
| if(*junk != '\0') |
| bb_error_msg_and_die(bb_msg_invalid_arg, slines_before, "-B"); |
| } |
| /* sanity checks after parse may be invalid numbers ;-) */ |
| if ((opt & (GREP_OPT_c|GREP_OPT_q|GREP_OPT_l|GREP_OPT_L))) { |
| opt &= ~GREP_OPT_n; |
| lines_before = 0; |
| lines_after = 0; |
| } else if(lines_before > 0) |
| before_buf = (char **)xcalloc(lines_before, sizeof(char *)); |
| } |
| #else |
| /* with auto sanity checks */ |
| bb_opt_complementally = "H-h:e::f::c-n:q-n:l-n"; |
| opt = bb_getopt_ulflags(argc, argv, GREP_OPTS OPT_EGREP, |
| &pattern_head, &fopt); |
| #endif |
| invert_search = (opt & GREP_OPT_v) != 0; /* 0 | 1 */ |
| |
| if(opt & GREP_OPT_H) |
| print_filename++; |
| if(opt & GREP_OPT_h) |
| print_filename--; |
| if (pattern_head != NULL) { |
| /* convert char *argv[] to grep_list_data_t */ |
| llist_t *cur; |
| |
| for(cur = pattern_head; cur; cur = cur->link) |
| cur->data = new_grep_list_data(cur->data, 0); |
| } |
| if(opt & GREP_OPT_f) |
| load_regexes_from_file(fopt); |
| |
| if(ENABLE_FEATURE_GREP_FGREP_ALIAS && bb_applet_name[0] == 'f') |
| opt |= GREP_OPT_F; |
| |
| if(ENABLE_FEATURE_GREP_EGREP_ALIAS && |
| (bb_applet_name[0] == 'e' || (opt & GREP_OPT_E))) |
| reflags = REG_EXTENDED | REG_NOSUB; |
| else |
| reflags = REG_NOSUB; |
| |
| if(opt & GREP_OPT_i) |
| reflags |= REG_ICASE; |
| |
| argv += optind; |
| argc -= optind; |
| |
| /* if we didn't get a pattern from a -e and no command file was specified, |
| * argv[optind] should be the pattern. no pattern, no worky */ |
| if (pattern_head == NULL) { |
| if (*argv == NULL) |
| bb_show_usage(); |
| else { |
| char *pattern = new_grep_list_data(*argv++, 0); |
| |
| llist_add_to(&pattern_head, pattern); |
| argc--; |
| } |
| } |
| |
| /* argv[(optind)..(argc-1)] should be names of file to grep through. If |
| * there is more than one file to grep, we will print the filenames */ |
| if (argc > 1) { |
| print_filename++; |
| |
| /* If no files were specified, or '-' was specified, take input from |
| * stdin. Otherwise, we grep through all the files specified. */ |
| } else if (argc == 0) { |
| argc++; |
| } |
| matched = 0; |
| while (argc--) { |
| cur_file = *argv++; |
| if(!cur_file || (*cur_file == '-' && !cur_file[1])) { |
| cur_file = "(standard input)"; |
| file = stdin; |
| } else { |
| file = fopen(cur_file, "r"); |
| } |
| if (file == NULL) { |
| if (!SUPPRESS_ERR_MSGS) |
| bb_perror_msg("%s", cur_file); |
| error_open_count++; |
| } else { |
| matched += grep_file(file); |
| if(matched < 0) { |
| /* we found a match but were told to be quiet, stop here and |
| * return success */ |
| break; |
| } |
| fclose(file); |
| } |
| } |
| |
| /* destroy all the elments in the pattern list */ |
| if (ENABLE_FEATURE_CLEAN_UP) { |
| while (pattern_head) { |
| llist_t *pattern_head_ptr = pattern_head; |
| grep_list_data_t *gl = |
| (grep_list_data_t *)pattern_head_ptr->data; |
| |
| pattern_head = pattern_head->link; |
| if((gl->flg_mem_alocated_compiled & PATTERN_MEM_A)) |
| free(gl->pattern); |
| if((gl->flg_mem_alocated_compiled & COMPILED)) |
| regfree(&(gl->preg)); |
| free(pattern_head_ptr); |
| } |
| } |
| /* 0 = success, 1 = failed, 2 = error */ |
| /* If the -q option is specified, the exit status shall be zero |
| * if an input line is selected, even if an error was detected. */ |
| if(BE_QUIET && matched) |
| return 0; |
| if(error_open_count) |
| return 2; |
| return !matched; /* invert return value 0 = success, 1 = failed */ |
| } |