busybox/findutils/grep.c

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/* vi: set sw=4 ts=4: */
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/*
* Mini grep implementation for busybox using libc regex.
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*
* 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.
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*/
/* 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 <dzo@simtreas.ru> -
* correction "-e pattern1 -e pattern2" logic and more optimizations.
* precompiled regex
*/
/*
* (C) 2006 Jac Goudsmit added -o option
*/
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#include "libbb.h"
#include "xregex.h"
/* options */
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#define OPTSTR_GREP \
"lnqvscFiHhe:f:Lorm:" \
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USE_FEATURE_GREP_CONTEXT("A:B:C:") \
USE_FEATURE_GREP_EGREP_ALIAS("E") \
USE_DESKTOP("w") \
USE_EXTRA_COMPAT("z") \
"aI"
/* ignored: -a "assume all files to be text" */
/* ignored: -I "assume binary files have no matches" */
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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_m, /* -m MAX_MATCHES */
USE_FEATURE_GREP_CONTEXT( OPTBIT_A ,) /* -A NUM: after-match context */
USE_FEATURE_GREP_CONTEXT( OPTBIT_B ,) /* -B NUM: before-match context */
USE_FEATURE_GREP_CONTEXT( OPTBIT_C ,) /* -C NUM: -A and -B combined */
USE_FEATURE_GREP_EGREP_ALIAS(OPTBIT_E ,) /* extended regexp */
USE_DESKTOP( OPTBIT_w ,) /* whole word match */
USE_EXTRA_COMPAT( OPTBIT_z ,) /* input is NUL terminated */
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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_m = 1 << OPTBIT_m,
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_EGREP_ALIAS((1 << OPTBIT_E)) + 0,
OPT_w = USE_DESKTOP( (1 << OPTBIT_w)) + 0,
OPT_z = USE_EXTRA_COMPAT( (1 << OPTBIT_z)) + 0,
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};
#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)
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#define PRINT_FILES_WITHOUT_MATCHES (option_mask32 & OPT_L)
#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;
USE_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 */
};
#define G (*(struct globals*)&bb_common_bufsiz1)
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#define INIT_G() do { \
struct G_sizecheck { \
char G_sizecheck[sizeof(G) > COMMON_BUFSIZE ? -1 : 1]; \
}; \
} 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 */
#define REG_EXTENDED RE_SYNTAX_EGREP
#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_alocated_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
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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
}
}
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#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 /* ENABLE_FEATURE_GREP_CONTEXT */
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;
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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) {
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found |= (strstr(line, gl->pattern) != NULL);
} else {
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if (!(gl->flg_mem_alocated_compiled & COMPILED)) {
gl->flg_mem_alocated_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;
#endif
if (
#if !ENABLE_EXTRA_COMPAT
regexec(&gl->compiled_regex, line, 1, &gl->matched_range, 0) == 0
#else
re_search(&gl->compiled_regex, line, line_len,
/*start:*/ 0, /*range:*/ line_len,
&gl->matched_range) >= 0
#endif
) {
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if (!(option_mask32 & OPT_w))
found = 1;
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else {
char c = ' ';
if (gl->matched_range.rm_so)
c = line[gl->matched_range.rm_so - 1];
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if (!isalnum(c) && c != '_') {
c = line[gl->matched_range.rm_eo];
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if (!c || (!isalnum(c) && c != '_'))
found = 1;
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}
}
}
}
/* If it's non-inverted search, we can stop
* at first match */
if (found && !invert_search)
goto do_found;
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);
}
/* if we're just printing filenames, we stop after the first match */
if (PRINT_FILES_WITH_MATCHES) {
puts(cur_file);
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/* fall through to "return 1" */
}
/* OPT_L aka PRINT_FILES_WITHOUT_MATCHES: return early */
return 1; /* one 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
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if (option_mask32 & OPT_o) {
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if (FGREP_FLAG) {
/* -Fo just prints the pattern
* (unless -v: -Fov doesnt print anything at all) */
if (found)
print_line(gl->pattern, strlen(gl->pattern), linenum, ':');
} else while (1) {
char old = line[gl->matched_range.rm_eo];
line[gl->matched_range.rm_eo] = '\0';
print_line(line + gl->matched_range.rm_so,
gl->matched_range.rm_eo - gl->matched_range.rm_so,
linenum, ':');
line[gl->matched_range.rm_eo] = old;
#if !ENABLE_EXTRA_COMPAT
break;
#else
if (re_search(&gl->compiled_regex, line, line_len,
gl->matched_range.rm_eo, line_len - gl->matched_range.rm_eo,
&gl->matched_range) < 0)
break;
#endif
}
} else {
print_line(line, line_len, linenum, ':');
}
}
}
#if ENABLE_FEATURE_GREP_CONTEXT
else { /* no match */
/* 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;
USE_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) {
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if (print_filename)
printf("%s:", cur_file);
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printf("%d\n", nmatches);
}
/* grep -L: print just the filename */
if (PRINT_FILES_WITHOUT_MATCHES) {
/* nmatches is zero, no need to check it:
* we return 1 early if we detected a match
* and PRINT_FILES_WITHOUT_MATCHES is set */
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 = xzalloc(sizeof(*gl));
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;
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while (fopt) {
llist_t *cur = fopt;
char *ffile = cur->data;
fopt = cur->link;
free(cur);
f = xfopen_stdin(ffile);
while ((line = xmalloc_fgetline(f)) != NULL) {
llist_add_to(&pattern_head,
new_grep_list_data(line, ALLOCATED));
}
}
}
static int FAST_FUNC file_action_grep(const char *filename,
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struct stat *statbuf UNUSED_PARAM,
void* matched,
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int depth UNUSED_PARAM)
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{
FILE *file = fopen_for_read(filename);
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if (file == NULL) {
if (!SUPPRESS_ERR_MSGS)
bb_simple_perror_msg(filename);
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open_errors = 1;
return 0;
}
cur_file = filename;
*(int*)matched += grep_file(file);
fclose(file);
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return 1;
}
static int grep_dir(const char *dir)
{
int matched = 0;
recursive_action(dir,
/* recurse=yes */ ACTION_RECURSE |
/* followLinks=no */
/* depthFirst=yes */ ACTION_DEPTHFIRST,
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/* fileAction= */ file_action_grep,
/* dirAction= */ NULL,
/* userData= */ &matched,
/* depth= */ 0);
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return matched;
}
int grep_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int grep_main(int argc, char **argv)
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{
FILE *file;
int matched;
llist_t *fopt = NULL;
/* do normal option parsing */
#if ENABLE_FEATURE_GREP_CONTEXT
int Copt;
/* -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,
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OPTSTR_GREP,
&pattern_head, &fopt, &max_matches,
&lines_after, &lines_before, &Copt);
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if (option_mask32 & OPT_C) {
/* -C unsets prev -A and -B, but following -A or -B
may override it */
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if (!(option_mask32 & OPT_A)) /* not overridden */
lines_after = Copt;
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if (!(option_mask32 & OPT_B)) /* not overridden */
lines_before = Copt;
}
/* sanity checks */
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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(before_buf[0]));
USE_EXTRA_COMPAT(before_buf_size = xzalloc(lines_before * sizeof(before_buf_size[0]));)
}
#else
/* with auto sanity checks */
/* -H unsets -h; -c,-q or -l unset -n; -e,-f are lists; -m N */
opt_complementary = "H-h:c-n:q-n:l-n:e::f::m+";
getopt32(argv, OPTSTR_GREP,
&pattern_head, &fopt, &max_matches);
#endif
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invert_search = ((option_mask32 & OPT_v) != 0); /* 0 | 1 */
if (pattern_head != NULL) {
/* convert char **argv to grep_list_data_t */
llist_t *cur;
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for (cur = pattern_head; cur; cur = cur->link)
cur->data = new_grep_list_data(cur->data, 0);
}
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if (option_mask32 & OPT_f)
load_regexes_from_file(fopt);
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if (ENABLE_FEATURE_GREP_FGREP_ALIAS && applet_name[0] == 'f')
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option_mask32 |= OPT_F;
#if !ENABLE_EXTRA_COMPAT
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if (!(option_mask32 & (OPT_o | OPT_w)))
reflags = REG_NOSUB;
#endif
if (ENABLE_FEATURE_GREP_EGREP_ALIAS
&& (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;
argc -= 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) {
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char *pattern;
if (*argv == NULL)
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bb_show_usage();
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pattern = new_grep_list_data(*argv++, 0);
llist_add_to(&pattern_head, pattern);
argc--;
}
/* argv[0..(argc-1)] should be names of file to grep through. If
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* there is more than one file to grep, we will print the filenames. */
if (argc > 1)
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print_filename = 1;
/* -H / -h of course override */
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if (option_mask32 & OPT_H)
print_filename = 1;
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if (option_mask32 & OPT_h)
print_filename = 0;
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/* 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++;
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file = stdin;
if (!cur_file || LONE_DASH(cur_file)) {
cur_file = "(standard input)";
} else {
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if (option_mask32 & OPT_r) {
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struct stat st;
if (stat(cur_file, &st) == 0 && S_ISDIR(st.st_mode)) {
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if (!(option_mask32 & OPT_h))
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print_filename = 1;
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matched += grep_dir(cur_file);
goto grep_done;
}
}
/* else: fopen(dir) will succeed, but reading won't */
file = fopen_for_read(cur_file);
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if (file == NULL) {
if (!SUPPRESS_ERR_MSGS)
bb_simple_perror_msg(cur_file);
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open_errors = 1;
continue;
}
}
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matched += grep_file(file);
fclose_if_not_stdin(file);
grep_done: ;
} while (--argc > 0);
/* 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 & ALLOCATED)
free(gl->pattern);
if (gl->flg_mem_alocated_compiled & COMPILED)
regfree(&gl->compiled_regex);
free(gl);
free(pattern_head_ptr);
}
}
/* 0 = success, 1 = failed, 2 = error */
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if (open_errors)
return 2;
return !matched; /* invert return value: 0 = success, 1 = failed */
}