/* 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 GPLv2 or later, see file LICENSE in this source tree. */ /* BB_AUDIT SUSv3 defects - unsupported option -x "match whole line only". */ /* 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 */ //config:config GREP //config: bool "grep (8.6 kb)" //config: default y //config: help //config: grep is used to search files for a specified pattern. //config: //config:config EGREP //config: bool "egrep (7.8 kb)" //config: default y //config: help //config: Alias to "grep -E". //config: //config:config FGREP //config: bool "fgrep (7.8 kb)" //config: default y //config: help //config: Alias to "grep -F". //config: //config:config FEATURE_GREP_CONTEXT //config: bool "Enable before and after context flags (-A, -B and -C)" //config: default y //config: depends on GREP || EGREP || FGREP //config: help //config: Print the specified number of leading (-B) and/or trailing (-A) //config: context surrounding our matching lines. //config: Print the specified number of context lines (-C). //applet:IF_GREP(APPLET(grep, BB_DIR_BIN, BB_SUID_DROP)) // APPLET_ODDNAME:name main location suid_type help //applet:IF_EGREP(APPLET_ODDNAME(egrep, grep, BB_DIR_BIN, BB_SUID_DROP, egrep)) //applet:IF_FGREP(APPLET_ODDNAME(fgrep, grep, BB_DIR_BIN, BB_SUID_DROP, fgrep)) //kbuild:lib-$(CONFIG_GREP) += grep.o //kbuild:lib-$(CONFIG_EGREP) += grep.o //kbuild:lib-$(CONFIG_FGREP) += grep.o #include "libbb.h" #include "common_bufsiz.h" #include "xregex.h" /* options */ //usage:#define grep_trivial_usage //usage: "[-HhnlLoqvsrRiwFE" //usage: IF_EXTRA_COMPAT("z") //usage: "] [-m N] " //usage: IF_FEATURE_GREP_CONTEXT("[-A/B/C N] ") //usage: "PATTERN/-e PATTERN.../-f FILE [FILE]..." //usage:#define grep_full_usage "\n\n" //usage: "Search for PATTERN in FILEs (or stdin)\n" //usage: "\n -H Add 'filename:' prefix" //usage: "\n -h Do not add 'filename:' prefix" //usage: "\n -n Add 'line_no:' prefix" //usage: "\n -l Show only names of files that match" //usage: "\n -L Show only names of files that don't match" //usage: "\n -c Show only count of matching lines" //usage: "\n -o Show only the matching part of line" //usage: "\n -q Quiet. Return 0 if PATTERN is found, 1 otherwise" //usage: "\n -v Select non-matching lines" //usage: "\n -s Suppress open and read errors" //usage: "\n -r Recurse" //usage: "\n -R Recurse and dereference symlinks" //usage: "\n -i Ignore case" //usage: "\n -w Match whole words only" //usage: "\n -x Match whole lines only" //usage: "\n -F PATTERN is a literal (not regexp)" //usage: "\n -E PATTERN is an extended regexp" //usage: IF_EXTRA_COMPAT( //usage: "\n -z Input is NUL terminated" //usage: ) //usage: "\n -m N Match up to N times per file" //usage: IF_FEATURE_GREP_CONTEXT( //usage: "\n -A N Print N lines of trailing context" //usage: "\n -B N Print N lines of leading context" //usage: "\n -C N Same as '-A N -B N'" //usage: ) //usage: "\n -e PTRN Pattern to match" //usage: "\n -f FILE Read pattern from file" //usage: //usage:#define grep_example_usage //usage: "$ grep root /etc/passwd\n" //usage: "root:x:0:0:root:/root:/bin/bash\n" //usage: "$ grep ^[rR]oo. /etc/passwd\n" //usage: "root:x:0:0:root:/root:/bin/bash\n" //usage: //usage:#define egrep_trivial_usage NOUSAGE_STR //usage:#define egrep_full_usage "" //usage:#define fgrep_trivial_usage NOUSAGE_STR //usage:#define fgrep_full_usage "" /* -e,-f are lists; -m,-A,-B,-C have numeric param */ #define OPTSTR_GREP \ "lnqvscFiHhe:*f:*LorRm:+wx" \ IF_FEATURE_GREP_CONTEXT("A:+B:+C:+") \ "E" \ IF_EXTRA_COMPAT("z") \ "aI" /* ignored: -a "assume all files to be text" */ /* ignored: -I "assume binary files have no matches" */ enum { OPTBIT_l, /* list matched file names only */ OPTBIT_n, /* print line# */ OPTBIT_q, /* quiet - exit(EXIT_SUCCESS) of first match */ OPTBIT_v, /* invert the match, to select non-matching lines */ OPTBIT_s, /* suppress errors about file open errors */ OPTBIT_c, /* count matches per file (suppresses normal output) */ OPTBIT_F, /* literal match */ OPTBIT_i, /* case-insensitive */ OPTBIT_H, /* force filename display */ OPTBIT_h, /* inhibit filename display */ OPTBIT_e, /* -e PATTERN */ OPTBIT_f, /* -f FILE_WITH_PATTERNS */ OPTBIT_L, /* list unmatched file names only */ OPTBIT_o, /* show only matching parts of lines */ OPTBIT_r, /* recurse dirs */ OPTBIT_R, /* recurse dirs and symlinks to dirs */ OPTBIT_m, /* -m MAX_MATCHES */ OPTBIT_w, /* -w whole word match */ OPTBIT_x, /* -x whole line match */ IF_FEATURE_GREP_CONTEXT( OPTBIT_A ,) /* -A NUM: after-match context */ IF_FEATURE_GREP_CONTEXT( OPTBIT_B ,) /* -B NUM: before-match context */ IF_FEATURE_GREP_CONTEXT( OPTBIT_C ,) /* -C NUM: -A and -B combined */ OPTBIT_E, /* extended regexp */ IF_EXTRA_COMPAT( OPTBIT_z ,) /* input is NUL terminated */ 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_R = 1 << OPTBIT_R, OPT_m = 1 << OPTBIT_m, OPT_w = 1 << OPTBIT_w, OPT_x = 1 << OPTBIT_x, OPT_A = IF_FEATURE_GREP_CONTEXT( (1 << OPTBIT_A)) + 0, OPT_B = IF_FEATURE_GREP_CONTEXT( (1 << OPTBIT_B)) + 0, OPT_C = IF_FEATURE_GREP_CONTEXT( (1 << OPTBIT_C)) + 0, OPT_E = 1 << OPTBIT_E, OPT_z = IF_EXTRA_COMPAT( (1 << OPTBIT_z)) + 0, }; #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 NUL_DELIMITED (option_mask32 & OPT_z) struct globals { int max_matches; #if !ENABLE_EXTRA_COMPAT int reflags; #else RE_TRANSLATE_TYPE case_fold; /* RE_TRANSLATE_TYPE is [[un]signed] char* */ #endif smalluint invert_search; smalluint print_filename; smalluint open_errors; #if ENABLE_FEATURE_GREP_CONTEXT smalluint did_print_line; int lines_before; int lines_after; char **before_buf; IF_EXTRA_COMPAT(size_t *before_buf_size;) int last_line_printed; #endif /* globals used internally */ llist_t *pattern_head; /* growable list of patterns to match */ const char *cur_file; /* the current file we are reading */ } FIX_ALIASING; #define G (*(struct globals*)bb_common_bufsiz1) #define INIT_G() do { \ setup_common_bufsiz(); \ BUILD_BUG_ON(sizeof(G) > COMMON_BUFSIZE); \ } while (0) #define max_matches (G.max_matches ) #if !ENABLE_EXTRA_COMPAT # define reflags (G.reflags ) #else # define case_fold (G.case_fold ) /* http://www.delorie.com/gnu/docs/regex/regex_46.html */ # define reflags re_syntax_options # undef REG_NOSUB # undef REG_EXTENDED # undef REG_ICASE # define REG_NOSUB bug:is:here /* should not be used */ /* Just RE_SYNTAX_EGREP is not enough, need to enable {n[,[m]]} too */ # define REG_EXTENDED (RE_SYNTAX_EGREP | RE_INTERVALS | RE_NO_BK_BRACES) # define REG_ICASE bug:is:here /* should not be used */ #endif #define invert_search (G.invert_search ) #define print_filename (G.print_filename ) #define open_errors (G.open_errors ) #define did_print_line (G.did_print_line ) #define lines_before (G.lines_before ) #define lines_after (G.lines_after ) #define before_buf (G.before_buf ) #define before_buf_size (G.before_buf_size ) #define last_line_printed (G.last_line_printed ) #define pattern_head (G.pattern_head ) #define cur_file (G.cur_file ) typedef struct grep_list_data_t { char *pattern; /* for GNU regex, matched_range must be persistent across grep_file() calls */ #if !ENABLE_EXTRA_COMPAT regex_t compiled_regex; regmatch_t matched_range; #else struct re_pattern_buffer compiled_regex; struct re_registers matched_range; #endif #define ALLOCATED 1 #define COMPILED 2 int flg_mem_allocated_compiled; } grep_list_data_t; #if !ENABLE_EXTRA_COMPAT #define print_line(line, line_len, linenum, decoration) \ print_line(line, linenum, decoration) #endif static void print_line(const char *line, size_t line_len, int linenum, char decoration) { #if ENABLE_FEATURE_GREP_CONTEXT /* Happens when we go to next file, immediately hit match * and try to print prev context... from prev file! Don't do it */ if (linenum < 1) return; /* possibly print the little '--' separator */ if ((lines_before || lines_after) && did_print_line && last_line_printed != linenum - 1 ) { puts("--"); } /* guard against printing "--" before first line of first file */ did_print_line = 1; 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)) { #if !ENABLE_EXTRA_COMPAT puts(line); #else fwrite(line, 1, line_len, stdout); putchar(NUL_DELIMITED ? '\0' : '\n'); #endif } } #if ENABLE_EXTRA_COMPAT /* Unlike getline, this one removes trailing '\n' */ static ssize_t FAST_FUNC bb_getline(char **line_ptr, size_t *line_alloc_len, FILE *file) { ssize_t res_sz; char *line; int delim = (NUL_DELIMITED ? '\0' : '\n'); res_sz = getdelim(line_ptr, line_alloc_len, delim, file); line = *line_ptr; if (res_sz > 0) { if (line[res_sz - 1] == delim) line[--res_sz] = '\0'; } else { free(line); /* uclibc allocates a buffer even on EOF. WTF? */ } return res_sz; } #endif static int grep_file(FILE *file) { smalluint found; int linenum = 0; int nmatches = 0; #if !ENABLE_EXTRA_COMPAT char *line; #else char *line = NULL; ssize_t line_len; size_t line_alloc_len; # define rm_so start[0] # define rm_eo end[0] #endif #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 */ #else enum { print_n_lines_after = 0 }; #endif while ( #if !ENABLE_EXTRA_COMPAT (line = xmalloc_fgetline(file)) != NULL #else (line_len = bb_getline(&line, &line_alloc_len, file)) >= 0 #endif ) { llist_t *pattern_ptr = pattern_head; grep_list_data_t *gl = gl; /* for gcc */ linenum++; found = 0; while (pattern_ptr) { gl = (grep_list_data_t *)pattern_ptr->data; if (FGREP_FLAG) { char *match; char *str = line; opt_f_again: match = ((option_mask32 & OPT_i) ? strcasestr(str, gl->pattern) : strstr(str, gl->pattern) ); if (match) { if (option_mask32 & OPT_x) { if (match != str) goto opt_f_not_found; if (str[strlen(gl->pattern)] != '\0') goto opt_f_not_found; } else if (option_mask32 & OPT_w) { char c = (match != line) ? match[-1] : ' '; if (!isalnum(c) && c != '_') { c = match[strlen(gl->pattern)]; if (!c || (!isalnum(c) && c != '_')) goto opt_f_found; } str = match + 1; goto opt_f_again; } opt_f_found: found = 1; opt_f_not_found: ; } } else { #if ENABLE_EXTRA_COMPAT unsigned start_pos; #else int match_flg; #endif char *match_at; if (!(gl->flg_mem_allocated_compiled & COMPILED)) { gl->flg_mem_allocated_compiled |= COMPILED; #if !ENABLE_EXTRA_COMPAT xregcomp(&gl->compiled_regex, gl->pattern, reflags); #else memset(&gl->compiled_regex, 0, sizeof(gl->compiled_regex)); gl->compiled_regex.translate = case_fold; /* for -i */ if (re_compile_pattern(gl->pattern, strlen(gl->pattern), &gl->compiled_regex)) bb_error_msg_and_die("bad regex '%s'", gl->pattern); #endif } #if !ENABLE_EXTRA_COMPAT gl->matched_range.rm_so = 0; gl->matched_range.rm_eo = 0; match_flg = 0; #else start_pos = 0; #endif match_at = line; opt_w_again: //bb_error_msg("'%s' start_pos:%d line_len:%d", match_at, start_pos, line_len); if ( #if !ENABLE_EXTRA_COMPAT regexec(&gl->compiled_regex, match_at, 1, &gl->matched_range, match_flg) == 0 #else re_search(&gl->compiled_regex, match_at, line_len, start_pos, /*range:*/ line_len, &gl->matched_range) >= 0 #endif ) { if (option_mask32 & OPT_x) { found |= (gl->matched_range.rm_so == 0 && match_at[gl->matched_range.rm_eo] == '\0'); } else if (!(option_mask32 & OPT_w)) { found = 1; } else { char c = ' '; if (match_at > line || gl->matched_range.rm_so != 0) { c = match_at[gl->matched_range.rm_so - 1]; } if (!isalnum(c) && c != '_') { c = match_at[gl->matched_range.rm_eo]; } if (!isalnum(c) && c != '_') { found = 1; } else { /* * Why check gl->matched_range.rm_eo? * Zero-length match makes -w skip the line: * "echo foo | grep ^" prints "foo", * "echo foo | grep -w ^" prints nothing. * Without such check, we can loop forever. */ #if !ENABLE_EXTRA_COMPAT if (gl->matched_range.rm_eo != 0) { match_at += gl->matched_range.rm_eo; match_flg |= REG_NOTBOL; goto opt_w_again; } #else if (gl->matched_range.rm_eo > start_pos) { start_pos = gl->matched_range.rm_eo; goto opt_w_again; } #endif } } } } /* If it's a non-inverted search, we can stop * at first match and report it. * If it's an inverted search, we can move on * to the next line of input, ignoring the * rest of the patterns. */ if (found) { //if (invert_search) // goto do_not_found; //goto do_found; break; // this accomplishes both } pattern_ptr = pattern_ptr->link; } /* while (pattern_ptr) */ if (found ^ invert_search) { //do_found: /* keep track of matches */ nmatches++; /* quiet/print (non)matching file names only? */ if (option_mask32 & (OPT_q|OPT_l|OPT_L)) { free(line); /* we don't need line anymore */ if (BE_QUIET) { /* manpage says about -q: * "exit immediately with zero status * if any match is found, * even if errors were detected" */ exit(EXIT_SUCCESS); } /* -l "print filenames with matches": stop after the first match */ if (option_mask32 & OPT_l) { puts(cur_file); return 1; } /* -L "print filenames without matches": return early too */ return 0; /* 0: we do not print fname, hence it's "not a match" */ } #if ENABLE_FEATURE_GREP_CONTEXT /* Were we printing context and saw next (unwanted) match? */ if ((option_mask32 & OPT_m) && nmatches > max_matches) break; #endif /* 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], before_buf_size[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) { if (FGREP_FLAG) { /* -Fo just prints the pattern * (unless -v: -Fov doesn't print anything at all) */ if (found) print_line(gl->pattern, strlen(gl->pattern), linenum, ':'); } else while (1) { unsigned start = gl->matched_range.rm_so; unsigned end = gl->matched_range.rm_eo; unsigned len = end - start; char old = line[end]; line[end] = '\0'; /* Empty match is not printed: try "echo test | grep -o ''" */ if (len != 0) print_line(line + start, len, linenum, ':'); if (old == '\0') break; line[end] = old; if (len == 0) end++; #if !ENABLE_EXTRA_COMPAT if (regexec(&gl->compiled_regex, line + end, 1, &gl->matched_range, REG_NOTBOL) != 0) break; gl->matched_range.rm_so += end; gl->matched_range.rm_eo += end; #else if (re_search(&gl->compiled_regex, line, line_len, end, line_len - end, &gl->matched_range) < 0) break; #endif } } else { print_line(line, line_len, linenum, ':'); } } } #if ENABLE_FEATURE_GREP_CONTEXT else { /* no match */ //do_not_found: /* if we need to print some context lines after the last match, do so */ if (print_n_lines_after) { print_line(line, strlen(line), linenum, '-'); print_n_lines_after--; } else if (lines_before) { /* Add the line to the circular 'before' buffer */ free(before_buf[curpos]); before_buf[curpos] = line; IF_EXTRA_COMPAT(before_buf_size[curpos] = line_len;) curpos = (curpos + 1) % lines_before; /* avoid free(line) - we took the line */ line = NULL; } } #endif /* ENABLE_FEATURE_GREP_CONTEXT */ #if !ENABLE_EXTRA_COMPAT free(line); #endif /* Did we print all context after last requested match? */ if ((option_mask32 & OPT_m) && !print_n_lines_after && nmatches == max_matches ) { break; } } /* while (read 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 filenames without matches" */ if (option_mask32 & OPT_L) { /* nmatches is zero, no need to check it: * we return 0 early if -L and we detect a match */ puts(cur_file); return 1; /* 1: we printed fname, hence it's "a match" */ } return nmatches != 0; /* we return not a count, but a boolean */ } #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 = xzalloc(sizeof(*gl)); gl->pattern = pattern; #if ENABLE_FEATURE_CLEAN_UP gl->flg_mem_allocated_compiled = flg_used_mem; #else /*gl->flg_mem_allocated_compiled = 0;*/ #endif return (char *)gl; } static void load_regexes_from_file(llist_t *fopt) { while (fopt) { char *line; FILE *fp; llist_t *cur = fopt; char *ffile = cur->data; fopt = cur->link; free(cur); fp = xfopen_stdin(ffile); while ((line = xmalloc_fgetline(fp)) != NULL) { llist_add_to(&pattern_head, new_grep_list_data(line, ALLOCATED)); } fclose_if_not_stdin(fp); } } static void load_pattern_list(llist_t **lst, char *pattern) { char *p; while ((p = strsep(&pattern, "\n")) != NULL) llist_add_to(lst, new_grep_list_data(p, 0)); } static int FAST_FUNC file_action_grep(struct recursive_state *state UNUSED_PARAM, const char *filename, struct stat *statbuf) { FILE *file; /* If we are given a link to a directory, we should bail out now, rather * than trying to open the "file" and hoping getline gives us nothing, * since that is not portable across operating systems (FreeBSD for * example will return the raw directory contents). */ if (S_ISLNK(statbuf->st_mode)) { struct stat sb; if (stat(filename, &sb) != 0) { if (!SUPPRESS_ERR_MSGS) bb_simple_perror_msg(filename); return 0; } if (S_ISDIR(sb.st_mode)) return 1; } file = fopen_for_read(filename); if (file == NULL) { if (!SUPPRESS_ERR_MSGS) bb_simple_perror_msg(filename); open_errors = 1; return 0; } cur_file = filename; *(int*)state->userData |= grep_file(file); fclose(file); return 1; } static int grep_dir(const char *dir) { int matched = 0; recursive_action(dir, 0 | ACTION_RECURSE | ((option_mask32 & OPT_R) ? ACTION_FOLLOWLINKS : 0) | ACTION_FOLLOWLINKS_L0 /* grep -r ... SYMLINK follows it */ | ACTION_DEPTHFIRST | 0, /* fileAction= */ file_action_grep, /* dirAction= */ NULL, /* userData= */ &matched ); return matched; } int grep_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; int grep_main(int argc UNUSED_PARAM, char **argv) { FILE *file; int matched; llist_t *fopt = NULL; #if ENABLE_FEATURE_GREP_CONTEXT int Copt, opts; #endif INIT_G(); /* For grep, exitcode of 1 is "not found". Other errors are 2: */ xfunc_error_retval = 2; /* do normal option parsing */ #if ENABLE_FEATURE_GREP_CONTEXT /* -H unsets -h; -C unsets -A,-B */ opts = getopt32long(argv, "^" OPTSTR_GREP "\0" "H-h:C-AB", "color\0" Optional_argument "\xff", &pattern_head, &fopt, &max_matches, &lines_after, &lines_before, &Copt , NULL ); if (opts & OPT_C) { /* -C unsets prev -A and -B, but following -A or -B * may override it */ if (!(opts & OPT_A)) /* not overridden */ lines_after = Copt; if (!(opts & OPT_B)) /* not overridden */ lines_before = Copt; } /* sanity checks */ if (opts & (OPT_c|OPT_q|OPT_l|OPT_L)) { option_mask32 &= ~OPT_n; lines_before = 0; lines_after = 0; } else if (lines_before > 0) { if (lines_before > INT_MAX / sizeof(long long)) lines_before = INT_MAX / sizeof(long long); /* overflow in (lines_before * sizeof(x)) is prevented (above) */ before_buf = xzalloc(lines_before * sizeof(before_buf[0])); IF_EXTRA_COMPAT(before_buf_size = xzalloc(lines_before * sizeof(before_buf_size[0]));) } #else /* with auto sanity checks */ getopt32(argv, "^" OPTSTR_GREP "\0" "H-h:c-n:q-n:l-n:", // why trailing ":"? &pattern_head, &fopt, &max_matches); #endif invert_search = ((option_mask32 & OPT_v) != 0); /* 0 | 1 */ { /* convert char **argv to pattern_list */ llist_t *cur, *new = NULL; for (cur = pattern_head; cur; cur = cur->link) load_pattern_list(&new, cur->data); llist_free(pattern_head, NULL); pattern_head = new; } if (option_mask32 & OPT_f) { load_regexes_from_file(fopt); if (!pattern_head) { /* -f EMPTY_FILE? */ /* GNU grep treats it as "nothing matches" except when -x */ const char *data = (option_mask32 & OPT_x) ? ".*" : ""; llist_add_to(&pattern_head, new_grep_list_data((char*)data, 0)); invert_search ^= 1; } } if (ENABLE_FGREP && applet_name[0] == 'f') option_mask32 |= OPT_F; #if !ENABLE_EXTRA_COMPAT if (!(option_mask32 & (OPT_o | OPT_w | OPT_x))) reflags = REG_NOSUB; #endif if ((ENABLE_EGREP && applet_name[0] == 'e') || (option_mask32 & OPT_E) ) { reflags |= REG_EXTENDED; } #if ENABLE_EXTRA_COMPAT else { reflags = RE_SYNTAX_GREP; } #endif if (option_mask32 & OPT_i) { #if !ENABLE_EXTRA_COMPAT reflags |= REG_ICASE; #else int i; case_fold = xmalloc(256); for (i = 0; i < 256; i++) case_fold[i] = (unsigned char)i; for (i = 'a'; i <= 'z'; i++) case_fold[i] = (unsigned char)(i - ('a' - 'A')); #endif } argv += optind; /* if we didn't get a pattern from -e and no command file was specified, * first parameter should be the pattern. no pattern, no worky */ if (pattern_head == NULL) { if (*argv == NULL) bb_show_usage(); load_pattern_list(&pattern_head, *argv++); } /* argv[0..(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 (argv[0] && argv[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. */ matched = 0; do { cur_file = *argv; file = stdin; if (!cur_file || LONE_DASH(cur_file)) { cur_file = "(standard input)"; } else { if (option_mask32 & (OPT_r|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_for_read(cur_file); if (file == NULL) { if (!SUPPRESS_ERR_MSGS) bb_simple_perror_msg(cur_file); open_errors = 1; continue; } } matched |= grep_file(file); fclose_if_not_stdin(file); grep_done: ; } while (*argv && *++argv); /* destroy all the elements 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_allocated_compiled & ALLOCATED) free(gl->pattern); if (gl->flg_mem_allocated_compiled & COMPILED) regfree(&gl->compiled_regex); free(gl); free(pattern_head_ptr); } } /* 0 = success, 1 = failed, 2 = error */ if (open_errors) return 2; return !matched; /* invert return value: 0 = success, 1 = failed */ }