/* 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 * * Licensed under the GPL v2 or later, 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 - * correction "-e pattern1 -e pattern2" logic and more optimizations. * precompiled regex */ /* * (C) 2006 Jac Goudsmit added -o option */ #include "busybox.h" #include "xregex.h" /* options */ #define OPTSTR_GREP \ "lnqvscFiHhe:f:Lor" \ USE_FEATURE_GREP_CONTEXT("A:B:C:") \ USE_FEATURE_GREP_EGREP_ALIAS("E") \ USE_DESKTOP("w") \ "aI" /* ignored: -a "assume all files to be text" */ /* ignored: -I "assume binary files have no matches" */ enum { OPTBIT_l, OPTBIT_n, OPTBIT_q, OPTBIT_v, OPTBIT_s, OPTBIT_c, OPTBIT_F, OPTBIT_i, OPTBIT_H, OPTBIT_h, OPTBIT_e, OPTBIT_f, OPTBIT_L, OPTBIT_o, OPTBIT_r, USE_FEATURE_GREP_CONTEXT(OPTBIT_A ,) USE_FEATURE_GREP_CONTEXT(OPTBIT_B ,) USE_FEATURE_GREP_CONTEXT(OPTBIT_C ,) USE_FEATURE_GREP_CONTEXT(OPTBIT_E ,) USE_DESKTOP( OPTBIT_w ,) OPT_l = 1 << OPTBIT_l, OPT_n = 1 << OPTBIT_n, OPT_q = 1 << OPTBIT_q, OPT_v = 1 << OPTBIT_v, OPT_s = 1 << OPTBIT_s, OPT_c = 1 << OPTBIT_c, OPT_F = 1 << OPTBIT_F, OPT_i = 1 << OPTBIT_i, OPT_H = 1 << OPTBIT_H, OPT_h = 1 << OPTBIT_h, OPT_e = 1 << OPTBIT_e, OPT_f = 1 << OPTBIT_f, OPT_L = 1 << OPTBIT_L, OPT_o = 1 << OPTBIT_o, OPT_r = 1 << OPTBIT_r, OPT_A = USE_FEATURE_GREP_CONTEXT((1 << OPTBIT_A)) + 0, OPT_B = USE_FEATURE_GREP_CONTEXT((1 << OPTBIT_B)) + 0, OPT_C = USE_FEATURE_GREP_CONTEXT((1 << OPTBIT_C)) + 0, OPT_E = USE_FEATURE_GREP_CONTEXT((1 << OPTBIT_E)) + 0, OPT_w = USE_DESKTOP( (1 << OPTBIT_w)) + 0, }; #define PRINT_FILES_WITH_MATCHES (option_mask32 & OPT_l) #define PRINT_LINE_NUM (option_mask32 & OPT_n) #define BE_QUIET (option_mask32 & OPT_q) #define SUPPRESS_ERR_MSGS (option_mask32 & OPT_s) #define PRINT_MATCH_COUNTS (option_mask32 & OPT_c) #define FGREP_FLAG (option_mask32 & OPT_F) #define PRINT_FILES_WITHOUT_MATCHES (option_mask32 & OPT_L) typedef unsigned char byte_t; static int reflags; static byte_t invert_search; static byte_t print_filename; static byte_t open_errors; #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 const char *cur_file; /* the current file we are reading */ typedef struct grep_list_data_t { 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) printf("%s%c", cur_file, decoration); if (PRINT_LINE_NUM) printf("%i%c", linenum, decoration); /* Emulate weird GNU grep behavior with -ov */ if ((option_mask32 & (OPT_v+OPT_o)) != (OPT_v+OPT_o)) puts(line); } static int grep_file(FILE *file) { char *line; byte_t ret; int linenum = 0; int nmatches = 0; regmatch_t regmatch; #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 = xmalloc_getline(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); } regmatch.rm_so = 0; regmatch.rm_eo = 0; if (regexec(&(gl->preg), line, 1, ®match, 0) == 0) { if (!(option_mask32 & OPT_w)) ret = 1; else { char c = ' '; if (regmatch.rm_so) c = line[regmatch.rm_so - 1]; if (!isalnum(c) && c != '_') { c = line[regmatch.rm_eo]; if (!c || (!isalnum(c) && c != '_')) ret = 1; } } } } 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 if (option_mask32 & OPT_o) { line[regmatch.rm_eo] = '\0'; print_line(line + regmatch.rm_so, linenum, ':'); } else { 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] = 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) 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 = xfopen(ffile, "r"); while ((line = xmalloc_getline(f)) != NULL) { llist_add_to(&pattern_head, new_grep_list_data(line, PATTERN_MEM_A)); } } } static int file_action_grep(const char *filename, struct stat *statbuf, void* matched, int depth) { FILE *file = fopen(filename, "r"); if (file == NULL) { if (!SUPPRESS_ERR_MSGS) bb_perror_msg("%s", cur_file); open_errors = 1; return 0; } cur_file = filename; *(int*)matched += grep_file(file); fclose(file); return 1; } static int grep_dir(const char *dir) { int matched = 0; recursive_action(dir, /* recurse= */ 1, /* followLinks= */ 0, /* depthFirst= */ 1, /* fileAction= */ file_action_grep, /* dirAction= */ NULL, /* userData= */ &matched, /* depth= */ 0); return matched; } int grep_main(int argc, char **argv); int grep_main(int argc, char **argv) { FILE *file; int matched; llist_t *fopt = NULL; /* do normal option parsing */ #if ENABLE_FEATURE_GREP_CONTEXT char *slines_after; char *slines_before; char *Copt; opt_complementary = "H-h:e::f::C-AB"; getopt32(argc, argv, OPTSTR_GREP, &pattern_head, &fopt, &slines_after, &slines_before, &Copt); if (option_mask32 & OPT_C) { /* -C unsets prev -A and -B, but following -A or -B may override it */ if (!(option_mask32 & OPT_A)) /* not overridden */ slines_after = Copt; if (!(option_mask32 & OPT_B)) /* not overridden */ slines_before = Copt; option_mask32 |= OPT_A|OPT_B; /* for parser */ } if (option_mask32 & OPT_A) { lines_after = xatoi_u(slines_after); } if (option_mask32 & OPT_B) { lines_before = xatoi_u(slines_before); } /* sanity checks */ if (option_mask32 & (OPT_c|OPT_q|OPT_l|OPT_L)) { option_mask32 &= ~OPT_n; lines_before = 0; lines_after = 0; } else if (lines_before > 0) before_buf = xzalloc(lines_before * sizeof(char *)); #else /* with auto sanity checks */ opt_complementary = "H-h:e::f::c-n:q-n:l-n"; getopt32(argc, argv, OPTSTR_GREP, &pattern_head, &fopt); #endif invert_search = ((option_mask32 & OPT_v) != 0); /* 0 | 1 */ 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 (option_mask32 & OPT_f) load_regexes_from_file(fopt); if (ENABLE_FEATURE_GREP_FGREP_ALIAS && applet_name[0] == 'f') option_mask32 |= OPT_F; if (!(option_mask32 & (OPT_o | OPT_w))) reflags = REG_NOSUB; if (ENABLE_FEATURE_GREP_EGREP_ALIAS && (applet_name[0] == 'e' || (option_mask32 & OPT_E))) reflags |= REG_EXTENDED; if (option_mask32 & 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) { char *pattern; if (*argv == NULL) bb_show_usage(); 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 = 1; /* -H / -h of course override */ if (option_mask32 & OPT_H) print_filename = 1; if (option_mask32 & OPT_h) print_filename = 0; /* If no files were specified, or '-' was specified, take input from * stdin. Otherwise, we grep through all the files specified. */ if (argc == 0) argc++; matched = 0; while (argc--) { cur_file = *argv++; file = stdin; if (!cur_file || (*cur_file == '-' && !cur_file[1])) { cur_file = "(standard input)"; } else { if (option_mask32 & OPT_r) { struct stat st; if (stat(cur_file, &st) == 0 && S_ISDIR(st.st_mode)) { if (!(option_mask32 & OPT_h)) print_filename = 1; matched += grep_dir(cur_file); goto grep_done; } } /* else: fopen(dir) will succeed, but reading won't */ file = fopen(cur_file, "r"); if (file == NULL) { if (!SUPPRESS_ERR_MSGS) bb_perror_msg("%s", cur_file); open_errors = 1; continue; } } matched += grep_file(file); fclose_if_not_stdin(file); grep_done: if (matched < 0) { /* we found a match but were told to be quiet, stop here and * return success */ break; } } /* 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 (open_errors) return 2; return !matched; /* invert return value 0 = success, 1 = failed */ }