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853 lines
25 KiB
C
853 lines
25 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini grep implementation for busybox using libc regex.
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*
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* Copyright (C) 1999,2000,2001 by Lineo, inc. and Mark Whitley
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* Copyright (C) 1999,2000,2001 by Mark Whitley <markw@codepoet.org>
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*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*/
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/* BB_AUDIT SUSv3 defects - unsupported option -x "match whole line only". */
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/* BB_AUDIT GNU defects - always acts as -a. */
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/* http://www.opengroup.org/onlinepubs/007904975/utilities/grep.html */
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/*
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* 2004,2006 (C) Vladimir Oleynik <dzo@simtreas.ru> -
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* correction "-e pattern1 -e pattern2" logic and more optimizations.
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* precompiled regex
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*
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* (C) 2006 Jac Goudsmit added -o option
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*/
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//applet:IF_GREP(APPLET(grep, BB_DIR_BIN, BB_SUID_DROP))
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//applet:IF_FEATURE_GREP_EGREP_ALIAS(APPLET_ODDNAME(egrep, grep, BB_DIR_BIN, BB_SUID_DROP, egrep))
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//applet:IF_FEATURE_GREP_FGREP_ALIAS(APPLET_ODDNAME(fgrep, grep, BB_DIR_BIN, BB_SUID_DROP, fgrep))
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//kbuild:lib-$(CONFIG_GREP) += grep.o
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//config:config GREP
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//config: bool "grep"
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//config: default y
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//config: help
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//config: grep is used to search files for a specified pattern.
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//config:
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//config:config FEATURE_GREP_EGREP_ALIAS
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//config: bool "Enable extended regular expressions (egrep & grep -E)"
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//config: default y
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//config: depends on GREP
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//config: help
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//config: Enabled support for extended regular expressions. Extended
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//config: regular expressions allow for alternation (foo|bar), grouping,
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//config: and various repetition operators.
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//config:
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//config:config FEATURE_GREP_FGREP_ALIAS
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//config: bool "Alias fgrep to grep -F"
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//config: default y
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//config: depends on GREP
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//config: help
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//config: fgrep sees the search pattern as a normal string rather than
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//config: regular expressions.
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//config: grep -F always works, this just creates the fgrep alias.
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//config:
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//config:config FEATURE_GREP_CONTEXT
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//config: bool "Enable before and after context flags (-A, -B and -C)"
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//config: default y
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//config: depends on GREP
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//config: help
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//config: Print the specified number of leading (-B) and/or trailing (-A)
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//config: context surrounding our matching lines.
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//config: Print the specified number of context lines (-C).
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#include "libbb.h"
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#include "common_bufsiz.h"
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#include "xregex.h"
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/* options */
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//usage:#define grep_trivial_usage
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//usage: "[-HhnlLoqvsriw"
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//usage: "F"
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//usage: IF_FEATURE_GREP_EGREP_ALIAS("E")
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//usage: IF_EXTRA_COMPAT("z")
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//usage: "] [-m N] "
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//usage: IF_FEATURE_GREP_CONTEXT("[-A/B/C N] ")
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//usage: "PATTERN/-e PATTERN.../-f FILE [FILE]..."
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//usage:#define grep_full_usage "\n\n"
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//usage: "Search for PATTERN in FILEs (or stdin)\n"
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//usage: "\n -H Add 'filename:' prefix"
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//usage: "\n -h Do not add 'filename:' prefix"
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//usage: "\n -n Add 'line_no:' prefix"
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//usage: "\n -l Show only names of files that match"
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//usage: "\n -L Show only names of files that don't match"
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//usage: "\n -c Show only count of matching lines"
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//usage: "\n -o Show only the matching part of line"
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//usage: "\n -q Quiet. Return 0 if PATTERN is found, 1 otherwise"
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//usage: "\n -v Select non-matching lines"
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//usage: "\n -s Suppress open and read errors"
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//usage: "\n -r Recurse"
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//usage: "\n -i Ignore case"
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//usage: "\n -w Match whole words only"
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//usage: "\n -x Match whole lines only"
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//usage: "\n -F PATTERN is a literal (not regexp)"
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//usage: IF_FEATURE_GREP_EGREP_ALIAS(
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//usage: "\n -E PATTERN is an extended regexp"
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//usage: )
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//usage: IF_EXTRA_COMPAT(
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//usage: "\n -z Input is NUL terminated"
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//usage: )
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//usage: "\n -m N Match up to N times per file"
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//usage: IF_FEATURE_GREP_CONTEXT(
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//usage: "\n -A N Print N lines of trailing context"
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//usage: "\n -B N Print N lines of leading context"
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//usage: "\n -C N Same as '-A N -B N'"
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//usage: )
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//usage: "\n -e PTRN Pattern to match"
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//usage: "\n -f FILE Read pattern from file"
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//usage:
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//usage:#define grep_example_usage
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//usage: "$ grep root /etc/passwd\n"
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//usage: "root:x:0:0:root:/root:/bin/bash\n"
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//usage: "$ grep ^[rR]oo. /etc/passwd\n"
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//usage: "root:x:0:0:root:/root:/bin/bash\n"
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//usage:
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//usage:#define egrep_trivial_usage NOUSAGE_STR
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//usage:#define egrep_full_usage ""
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//usage:#define fgrep_trivial_usage NOUSAGE_STR
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//usage:#define fgrep_full_usage ""
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#define OPTSTR_GREP \
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"lnqvscFiHhe:f:Lorm:wx" \
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IF_FEATURE_GREP_CONTEXT("A:B:C:") \
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IF_FEATURE_GREP_EGREP_ALIAS("E") \
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IF_EXTRA_COMPAT("z") \
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"aI"
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/* ignored: -a "assume all files to be text" */
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/* ignored: -I "assume binary files have no matches" */
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enum {
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OPTBIT_l, /* list matched file names only */
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OPTBIT_n, /* print line# */
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OPTBIT_q, /* quiet - exit(EXIT_SUCCESS) of first match */
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OPTBIT_v, /* invert the match, to select non-matching lines */
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OPTBIT_s, /* suppress errors about file open errors */
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OPTBIT_c, /* count matches per file (suppresses normal output) */
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OPTBIT_F, /* literal match */
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OPTBIT_i, /* case-insensitive */
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OPTBIT_H, /* force filename display */
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OPTBIT_h, /* inhibit filename display */
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OPTBIT_e, /* -e PATTERN */
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OPTBIT_f, /* -f FILE_WITH_PATTERNS */
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OPTBIT_L, /* list unmatched file names only */
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OPTBIT_o, /* show only matching parts of lines */
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OPTBIT_r, /* recurse dirs */
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OPTBIT_m, /* -m MAX_MATCHES */
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OPTBIT_w, /* -w whole word match */
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OPTBIT_x, /* -x whole line match */
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IF_FEATURE_GREP_CONTEXT( OPTBIT_A ,) /* -A NUM: after-match context */
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IF_FEATURE_GREP_CONTEXT( OPTBIT_B ,) /* -B NUM: before-match context */
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IF_FEATURE_GREP_CONTEXT( OPTBIT_C ,) /* -C NUM: -A and -B combined */
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IF_FEATURE_GREP_EGREP_ALIAS(OPTBIT_E ,) /* extended regexp */
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IF_EXTRA_COMPAT( OPTBIT_z ,) /* input is NUL terminated */
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OPT_l = 1 << OPTBIT_l,
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OPT_n = 1 << OPTBIT_n,
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OPT_q = 1 << OPTBIT_q,
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OPT_v = 1 << OPTBIT_v,
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OPT_s = 1 << OPTBIT_s,
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OPT_c = 1 << OPTBIT_c,
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OPT_F = 1 << OPTBIT_F,
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OPT_i = 1 << OPTBIT_i,
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OPT_H = 1 << OPTBIT_H,
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OPT_h = 1 << OPTBIT_h,
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OPT_e = 1 << OPTBIT_e,
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OPT_f = 1 << OPTBIT_f,
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OPT_L = 1 << OPTBIT_L,
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OPT_o = 1 << OPTBIT_o,
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OPT_r = 1 << OPTBIT_r,
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OPT_m = 1 << OPTBIT_m,
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OPT_w = 1 << OPTBIT_w,
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OPT_x = 1 << OPTBIT_x,
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OPT_A = IF_FEATURE_GREP_CONTEXT( (1 << OPTBIT_A)) + 0,
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OPT_B = IF_FEATURE_GREP_CONTEXT( (1 << OPTBIT_B)) + 0,
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OPT_C = IF_FEATURE_GREP_CONTEXT( (1 << OPTBIT_C)) + 0,
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OPT_E = IF_FEATURE_GREP_EGREP_ALIAS((1 << OPTBIT_E)) + 0,
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OPT_z = IF_EXTRA_COMPAT( (1 << OPTBIT_z)) + 0,
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};
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#define PRINT_FILES_WITH_MATCHES (option_mask32 & OPT_l)
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#define PRINT_LINE_NUM (option_mask32 & OPT_n)
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#define BE_QUIET (option_mask32 & OPT_q)
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#define SUPPRESS_ERR_MSGS (option_mask32 & OPT_s)
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#define PRINT_MATCH_COUNTS (option_mask32 & OPT_c)
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#define FGREP_FLAG (option_mask32 & OPT_F)
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#define PRINT_FILES_WITHOUT_MATCHES (option_mask32 & OPT_L)
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#define NUL_DELIMITED (option_mask32 & OPT_z)
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struct globals {
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int max_matches;
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#if !ENABLE_EXTRA_COMPAT
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int reflags;
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#else
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RE_TRANSLATE_TYPE case_fold; /* RE_TRANSLATE_TYPE is [[un]signed] char* */
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#endif
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smalluint invert_search;
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smalluint print_filename;
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smalluint open_errors;
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#if ENABLE_FEATURE_GREP_CONTEXT
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smalluint did_print_line;
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int lines_before;
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int lines_after;
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char **before_buf;
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IF_EXTRA_COMPAT(size_t *before_buf_size;)
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int last_line_printed;
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#endif
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/* globals used internally */
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llist_t *pattern_head; /* growable list of patterns to match */
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const char *cur_file; /* the current file we are reading */
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} FIX_ALIASING;
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#define G (*(struct globals*)bb_common_bufsiz1)
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#define INIT_G() do { \
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setup_common_bufsiz(); \
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BUILD_BUG_ON(sizeof(G) > COMMON_BUFSIZE); \
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} while (0)
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#define max_matches (G.max_matches )
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#if !ENABLE_EXTRA_COMPAT
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# define reflags (G.reflags )
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#else
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# define case_fold (G.case_fold )
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/* http://www.delorie.com/gnu/docs/regex/regex_46.html */
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# define reflags re_syntax_options
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# undef REG_NOSUB
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# undef REG_EXTENDED
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# undef REG_ICASE
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# define REG_NOSUB bug:is:here /* should not be used */
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/* Just RE_SYNTAX_EGREP is not enough, need to enable {n[,[m]]} too */
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# define REG_EXTENDED (RE_SYNTAX_EGREP | RE_INTERVALS | RE_NO_BK_BRACES)
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# define REG_ICASE bug:is:here /* should not be used */
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#endif
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#define invert_search (G.invert_search )
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#define print_filename (G.print_filename )
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#define open_errors (G.open_errors )
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#define did_print_line (G.did_print_line )
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#define lines_before (G.lines_before )
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#define lines_after (G.lines_after )
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#define before_buf (G.before_buf )
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#define before_buf_size (G.before_buf_size )
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#define last_line_printed (G.last_line_printed )
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#define pattern_head (G.pattern_head )
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#define cur_file (G.cur_file )
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typedef struct grep_list_data_t {
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char *pattern;
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/* for GNU regex, matched_range must be persistent across grep_file() calls */
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#if !ENABLE_EXTRA_COMPAT
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regex_t compiled_regex;
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regmatch_t matched_range;
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#else
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struct re_pattern_buffer compiled_regex;
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struct re_registers matched_range;
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#endif
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#define ALLOCATED 1
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#define COMPILED 2
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int flg_mem_alocated_compiled;
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} grep_list_data_t;
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#if !ENABLE_EXTRA_COMPAT
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#define print_line(line, line_len, linenum, decoration) \
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print_line(line, linenum, decoration)
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#endif
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static void print_line(const char *line, size_t line_len, int linenum, char decoration)
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{
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#if ENABLE_FEATURE_GREP_CONTEXT
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/* Happens when we go to next file, immediately hit match
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* and try to print prev context... from prev file! Don't do it */
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if (linenum < 1)
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return;
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/* possibly print the little '--' separator */
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if ((lines_before || lines_after) && did_print_line
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&& last_line_printed != linenum - 1
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) {
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puts("--");
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}
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/* guard against printing "--" before first line of first file */
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did_print_line = 1;
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last_line_printed = linenum;
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#endif
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if (print_filename)
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printf("%s%c", cur_file, decoration);
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if (PRINT_LINE_NUM)
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printf("%i%c", linenum, decoration);
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/* Emulate weird GNU grep behavior with -ov */
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if ((option_mask32 & (OPT_v|OPT_o)) != (OPT_v|OPT_o)) {
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#if !ENABLE_EXTRA_COMPAT
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puts(line);
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#else
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fwrite(line, 1, line_len, stdout);
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putchar(NUL_DELIMITED ? '\0' : '\n');
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#endif
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}
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}
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#if ENABLE_EXTRA_COMPAT
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/* Unlike getline, this one removes trailing '\n' */
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static ssize_t FAST_FUNC bb_getline(char **line_ptr, size_t *line_alloc_len, FILE *file)
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{
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ssize_t res_sz;
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char *line;
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int delim = (NUL_DELIMITED ? '\0' : '\n');
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res_sz = getdelim(line_ptr, line_alloc_len, delim, file);
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line = *line_ptr;
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if (res_sz > 0) {
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if (line[res_sz - 1] == delim)
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line[--res_sz] = '\0';
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} else {
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free(line); /* uclibc allocates a buffer even on EOF. WTF? */
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}
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return res_sz;
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}
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#endif
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static int grep_file(FILE *file)
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{
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smalluint found;
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int linenum = 0;
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int nmatches = 0;
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#if !ENABLE_EXTRA_COMPAT
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char *line;
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#else
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char *line = NULL;
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ssize_t line_len;
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size_t line_alloc_len;
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# define rm_so start[0]
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# define rm_eo end[0]
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#endif
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#if ENABLE_FEATURE_GREP_CONTEXT
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int print_n_lines_after = 0;
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int curpos = 0; /* track where we are in the circular 'before' buffer */
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int idx = 0; /* used for iteration through the circular buffer */
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#else
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enum { print_n_lines_after = 0 };
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#endif
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while (
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#if !ENABLE_EXTRA_COMPAT
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(line = xmalloc_fgetline(file)) != NULL
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#else
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(line_len = bb_getline(&line, &line_alloc_len, file)) >= 0
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#endif
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) {
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llist_t *pattern_ptr = pattern_head;
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grep_list_data_t *gl = gl; /* for gcc */
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linenum++;
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found = 0;
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while (pattern_ptr) {
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gl = (grep_list_data_t *)pattern_ptr->data;
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if (FGREP_FLAG) {
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char *match;
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char *str = line;
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opt_f_again:
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match = ((option_mask32 & OPT_i)
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? strcasestr(str, gl->pattern)
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: strstr(str, gl->pattern)
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);
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if (match) {
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if (option_mask32 & OPT_x) {
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if (match != str)
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goto opt_f_not_found;
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if (str[strlen(gl->pattern)] != '\0')
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goto opt_f_not_found;
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} else
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if (option_mask32 & OPT_w) {
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char c = (match != str) ? match[-1] : ' ';
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if (!isalnum(c) && c != '_') {
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c = match[strlen(gl->pattern)];
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if (!c || (!isalnum(c) && c != '_'))
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goto opt_f_found;
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}
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str = match + 1;
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goto opt_f_again;
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}
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opt_f_found:
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found = 1;
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opt_f_not_found: ;
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}
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} else {
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#if ENABLE_EXTRA_COMPAT
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unsigned start_pos;
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#else
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int match_flg;
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#endif
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char *match_at;
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if (!(gl->flg_mem_alocated_compiled & COMPILED)) {
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gl->flg_mem_alocated_compiled |= COMPILED;
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#if !ENABLE_EXTRA_COMPAT
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xregcomp(&gl->compiled_regex, gl->pattern, reflags);
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#else
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memset(&gl->compiled_regex, 0, sizeof(gl->compiled_regex));
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gl->compiled_regex.translate = case_fold; /* for -i */
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if (re_compile_pattern(gl->pattern, strlen(gl->pattern), &gl->compiled_regex))
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bb_error_msg_and_die("bad regex '%s'", gl->pattern);
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#endif
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}
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#if !ENABLE_EXTRA_COMPAT
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gl->matched_range.rm_so = 0;
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gl->matched_range.rm_eo = 0;
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match_flg = 0;
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#else
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start_pos = 0;
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#endif
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match_at = line;
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opt_w_again:
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//bb_error_msg("'%s' start_pos:%d line_len:%d", match_at, start_pos, line_len);
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if (
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#if !ENABLE_EXTRA_COMPAT
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regexec(&gl->compiled_regex, match_at, 1, &gl->matched_range, match_flg) == 0
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#else
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re_search(&gl->compiled_regex, match_at, line_len,
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start_pos, /*range:*/ line_len,
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&gl->matched_range) >= 0
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#endif
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) {
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if (option_mask32 & OPT_x) {
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found = (gl->matched_range.rm_so == 0
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&& match_at[gl->matched_range.rm_eo] == '\0');
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} else
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if (!(option_mask32 & OPT_w)) {
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found = 1;
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} else {
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char c = ' ';
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if (match_at > line || gl->matched_range.rm_so != 0) {
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c = match_at[gl->matched_range.rm_so - 1];
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}
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if (!isalnum(c) && c != '_') {
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c = match_at[gl->matched_range.rm_eo];
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}
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if (!isalnum(c) && c != '_') {
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found = 1;
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} else {
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/*
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* Why check gl->matched_range.rm_eo?
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* Zero-length match makes -w skip the line:
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* "echo foo | grep ^" prints "foo",
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* "echo foo | grep -w ^" prints nothing.
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* Without such check, we can loop forever.
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*/
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#if !ENABLE_EXTRA_COMPAT
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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 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);
|
|
/* 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
|
|
if (option_mask32 & OPT_o) {
|
|
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) {
|
|
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 */
|
|
/* 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 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)
|
|
{
|
|
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 int FAST_FUNC file_action_grep(const char *filename,
|
|
struct stat *statbuf UNUSED_PARAM,
|
|
void* matched,
|
|
int depth UNUSED_PARAM)
|
|
{
|
|
FILE *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*)matched += grep_file(file);
|
|
fclose(file);
|
|
return 1;
|
|
}
|
|
|
|
static int grep_dir(const char *dir)
|
|
{
|
|
int matched = 0;
|
|
recursive_action(dir,
|
|
/* recurse=yes */ ACTION_RECURSE |
|
|
/* followLinks=command line only */ ACTION_FOLLOWLINKS_L0 |
|
|
/* depthFirst=yes */ ACTION_DEPTHFIRST,
|
|
/* fileAction= */ file_action_grep,
|
|
/* dirAction= */ NULL,
|
|
/* userData= */ &matched,
|
|
/* depth= */ 0);
|
|
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; -e,-f are lists;
|
|
* -m,-A,-B,-C have numeric param */
|
|
opt_complementary = "H-h:C-AB:e::f::m+:A+:B+:C+";
|
|
opts = getopt32(argv,
|
|
OPTSTR_GREP,
|
|
&pattern_head, &fopt, &max_matches,
|
|
&lines_after, &lines_before, &Copt);
|
|
|
|
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 */
|
|
/* -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
|
|
invert_search = ((option_mask32 & OPT_v) != 0); /* 0 | 1 */
|
|
|
|
{ /* 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 (!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 | OPT_x)))
|
|
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;
|
|
|
|
/* 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) {
|
|
char *pattern;
|
|
if (*argv == NULL)
|
|
bb_show_usage();
|
|
pattern = new_grep_list_data(*argv++, 0);
|
|
llist_add_to(&pattern_head, pattern);
|
|
}
|
|
|
|
/* 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) {
|
|
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 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 */
|
|
if (open_errors)
|
|
return 2;
|
|
return !matched; /* invert return value: 0 = success, 1 = failed */
|
|
}
|