* 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 or later, see the file LICENSE in this tarball.
+ * 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. */
* 2004,2006 (C) Vladimir Oleynik <dzo@simtreas.ru> -
* correction "-e pattern1 -e pattern2" logic and more optimizations.
* precompiled regex
- */
-/*
+ *
* (C) 2006 Jac Goudsmit added -o option
*/
+//applet:IF_GREP(APPLET(grep, BB_DIR_BIN, BB_SUID_DROP))
+//applet:IF_FEATURE_GREP_EGREP_ALIAS(APPLET_ODDNAME(egrep, grep, BB_DIR_BIN, BB_SUID_DROP, egrep))
+//applet:IF_FEATURE_GREP_FGREP_ALIAS(APPLET_ODDNAME(fgrep, grep, BB_DIR_BIN, BB_SUID_DROP, fgrep))
+
+//kbuild:lib-$(CONFIG_GREP) += grep.o
+
+//config:config GREP
+//config: bool "grep"
+//config: default y
+//config: help
+//config: grep is used to search files for a specified pattern.
+//config:
+//config:config FEATURE_GREP_EGREP_ALIAS
+//config: bool "Enable extended regular expressions (egrep & grep -E)"
+//config: default y
+//config: depends on GREP
+//config: help
+//config: Enabled support for extended regular expressions. Extended
+//config: regular expressions allow for alternation (foo|bar), grouping,
+//config: and various repetition operators.
+//config:
+//config:config FEATURE_GREP_FGREP_ALIAS
+//config: bool "Alias fgrep to grep -F"
+//config: default y
+//config: depends on GREP
+//config: help
+//config: fgrep sees the search pattern as a normal string rather than
+//config: regular expressions.
+//config: grep -F always works, this just creates the fgrep alias.
+//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
+//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).
+
#include "libbb.h"
#include "xregex.h"
+
/* options */
+//usage:#define grep_trivial_usage
+//usage: "[-HhnlLoqvsriw"
+//usage: "F"
+//usage: IF_FEATURE_GREP_EGREP_ALIAS("E")
+//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 -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: IF_FEATURE_GREP_EGREP_ALIAS(
+//usage: "\n -E PATTERN is an extended regexp"
+//usage: )
+//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 ""
+
#define OPTSTR_GREP \
- "lnqvscFiHhe:f:Lorm:w" \
+ "lnqvscFiHhe:f:Lorm:wx" \
IF_FEATURE_GREP_CONTEXT("A:B:C:") \
IF_FEATURE_GREP_EGREP_ALIAS("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_r, /* recurse 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 */
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,
while (pattern_ptr) {
gl = (grep_list_data_t *)pattern_ptr->data;
if (FGREP_FLAG) {
- found |= (strstr(line, gl->pattern) != NULL);
+ 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 != str) ? 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 {
+ char *match_at;
+
if (!(gl->flg_mem_alocated_compiled & COMPILED)) {
gl->flg_mem_alocated_compiled |= COMPILED;
#if !ENABLE_EXTRA_COMPAT
gl->matched_range.rm_so = 0;
gl->matched_range.rm_eo = 0;
#endif
+ match_at = line;
+ opt_w_again:
if (
#if !ENABLE_EXTRA_COMPAT
- regexec(&gl->compiled_regex, line, 1, &gl->matched_range, 0) == 0
+ regexec(&gl->compiled_regex, match_at, 1, &gl->matched_range, 0) == 0
#else
- re_search(&gl->compiled_regex, line, line_len,
+ re_search(&gl->compiled_regex, match_at, line_len,
/*start:*/ 0, /*range:*/ line_len,
&gl->matched_range) >= 0
#endif
) {
- if (!(option_mask32 & OPT_w))
+ 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 {
+ } else {
char c = ' ';
if (gl->matched_range.rm_so)
- c = line[gl->matched_range.rm_so - 1];
+ c = match_at[gl->matched_range.rm_so - 1];
if (!isalnum(c) && c != '_') {
- c = line[gl->matched_range.rm_eo];
- if (!c || (!isalnum(c) && c != '_'))
+ c = match_at[gl->matched_range.rm_eo];
+ if (!c || (!isalnum(c) && c != '_')) {
found = 1;
+ } else {
+ match_at += gl->matched_range.rm_eo;
+ goto opt_w_again;
+ }
}
}
}
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';
- print_line(line + gl->matched_range.rm_so,
- end - gl->matched_range.rm_so,
- linenum, ':');
+ /* 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)
static void load_regexes_from_file(llist_t *fopt)
{
- char *line;
- FILE *f;
-
while (fopt) {
+ char *line;
+ FILE *fp;
llist_t *cur = fopt;
char *ffile = cur->data;
fopt = cur->link;
free(cur);
- f = xfopen_stdin(ffile);
- while ((line = xmalloc_fgetline(f)) != NULL) {
+ 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);
}
}
/* do normal option parsing */
#if ENABLE_FEATURE_GREP_CONTEXT
- int Copt;
+ int Copt, opts;
/* -H unsets -h; -C unsets -A,-B; -e,-f are lists;
* -m,-A,-B,-C have numeric param */
opt_complementary = "H-h:C-AB:e::f::m+:A+:B+:C+";
- getopt32(argv,
+ opts = getopt32(argv,
OPTSTR_GREP,
&pattern_head, &fopt, &max_matches,
&lines_after, &lines_before, &Copt);
- if (option_mask32 & OPT_C) {
+ if (opts & OPT_C) {
/* -C unsets prev -A and -B, but following -A or -B
- may override it */
- if (!(option_mask32 & OPT_A)) /* not overridden */
+ * may override it */
+ if (!(opts & OPT_A)) /* not overridden */
lines_after = Copt;
- if (!(option_mask32 & OPT_B)) /* not overridden */
+ if (!(opts & OPT_B)) /* not overridden */
lines_before = Copt;
}
/* sanity checks */
- if (option_mask32 & (OPT_c|OPT_q|OPT_l|OPT_L)) {
+ 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]));)
}
#endif
invert_search = ((option_mask32 & OPT_v) != 0); /* 0 | 1 */
- if (pattern_head != NULL) {
- /* convert char **argv to grep_list_data_t */
+ { /* 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)
+ if (option_mask32 & OPT_f) {
load_regexes_from_file(fopt);
+ if (!pattern_head) { /* -f EMPTY_FILE? */
+ /* GNU grep treats it as "nothing matches" */
+ llist_add_to(&pattern_head, new_grep_list_data((char*) "", 0));
+ invert_search ^= 1;
+ }
+ }
if (ENABLE_FEATURE_GREP_FGREP_ALIAS && applet_name[0] == 'f')
option_mask32 |= OPT_F;
#if !ENABLE_EXTRA_COMPAT
- if (!(option_mask32 & (OPT_o | OPT_w)))
+ if (!(option_mask32 & (OPT_o | OPT_w | OPT_x)))
reflags = REG_NOSUB;
#endif