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grep: implement -o option. Patch by Jac Goudsmit.

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This commit is contained in:
Denis Vlasenko 2006-09-29 20:58:53 +00:00
parent 266bc17690
commit 51937534fb
1 changed files with 34 additions and 22 deletions
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56
findutils/grep.c
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@ -14,7 +14,10 @@
* 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
*/
#include "busybox.h"
#include "xregex.h"
@ -22,7 +25,7 @@
/* options */
static unsigned long opt;
#define GREP_OPTS "lnqvscFiHhe:f:L"
#define GREP_OPTS "lnqvscFiHhe:f:Lo"
#define GREP_OPT_l (1<<0)
#define PRINT_FILES_WITH_MATCHES (opt & GREP_OPT_l)
#define GREP_OPT_n (1<<1)
@ -44,19 +47,20 @@ static invert_search_t invert_search;
#define GREP_OPT_e (1<<10)
#define GREP_OPT_f (1<<11)
#define GREP_OPT_L (1<<12)
#define PRINT_FILES_WITHOUT_MATCHES ((opt & GREP_OPT_L) != 0)
#define PRINT_FILES_WITHOUT_MATCHES (opt & GREP_OPT_L)
#define GREP_OPT_o (1<<13)
#if ENABLE_FEATURE_GREP_CONTEXT
#define GREP_OPT_CONTEXT "A:B:C:"
#define GREP_OPT_A (1<<13)
#define GREP_OPT_B (1<<14)
#define GREP_OPT_C (1<<15)
#define GREP_OPT_E (1<<16)
#define GREP_OPT_A (1<<14)
#define GREP_OPT_B (1<<15)
#define GREP_OPT_C (1<<16)
#define GREP_OPT_E (1<<17)
#else
#define GREP_OPT_CONTEXT ""
#define GREP_OPT_A (0)
#define GREP_OPT_B (0)
#define GREP_OPT_C (0)
#define GREP_OPT_E (1<<13)
#define GREP_OPT_A 0
#define GREP_OPT_B 0
#define GREP_OPT_C 0
#define GREP_OPT_E (1<<14)
#endif
#if ENABLE_FEATURE_GREP_EGREP_ALIAS
# define OPT_EGREP "E"
@ -100,7 +104,9 @@ static void print_line(const char *line, int linenum, char decoration)
printf("%s%c", cur_file, decoration);
if (PRINT_LINE_NUM)
printf("%i%c", linenum, decoration);
puts(line);
/* Emulate weird GNU grep behavior with -ov */
if ((opt & (GREP_OPT_v+GREP_OPT_o)) != (GREP_OPT_v+GREP_OPT_o))
puts(line);
}
@ -110,6 +116,7 @@ static int grep_file(FILE *file)
invert_search_t ret;
int linenum = 0;
int nmatches = 0;
regmatch_t regmatch;
#if ENABLE_FEATURE_GREP_CONTEXT
int print_n_lines_after = 0;
int curpos = 0; /* track where we are in the circular 'before' buffer */
@ -137,12 +144,14 @@ static int grep_file(FILE *file)
gl->flg_mem_alocated_compiled |= COMPILED;
xregcomp(&(gl->preg), gl->pattern, reflags);
}
ret |= regexec(&(gl->preg), line, 0, NULL, 0) == 0;
regmatch.rm_so = 0;
regmatch.rm_eo = 0;
ret |= regexec(&(gl->preg), line, 1, &regmatch, 0) == 0;
}
pattern_ptr = pattern_ptr->link;
} /* while (pattern_ptr) */
if ((ret ^ invert_search)) {
if (ret ^ invert_search) {
if (PRINT_FILES_WITH_MATCHES || BE_QUIET)
free(line);
@ -190,7 +199,12 @@ static int grep_file(FILE *file)
/* make a note that we need to print 'after' lines */
print_n_lines_after = lines_after;
#endif
print_line(line, linenum, ':');
if (opt & GREP_OPT_o) {
line[regmatch.rm_eo] = '\0';
print_line(line + regmatch.rm_so, linenum, ':');
} else {
print_line(line, linenum, ':');
}
}
}
#if ENABLE_FEATURE_GREP_CONTEXT
@ -212,7 +226,6 @@ static int grep_file(FILE *file)
free(line);
}
/* special-case file post-processing for options where we don't print line
* matches, just filenames and possibly match counts */
@ -284,7 +297,6 @@ int grep_main(int argc, char **argv)
/* do normal option parsing */
#if ENABLE_FEATURE_GREP_CONTEXT
{
char *junk;
char *slines_after;
char *slines_before;
@ -316,13 +328,12 @@ int grep_main(int argc, char **argv)
bb_error_msg_and_die(bb_msg_invalid_arg, slines_before, "-B");
}
/* sanity checks after parse may be invalid numbers ;-) */
if ((opt & (GREP_OPT_c|GREP_OPT_q|GREP_OPT_l|GREP_OPT_L))) {
if (opt & (GREP_OPT_c|GREP_OPT_q|GREP_OPT_l|GREP_OPT_L)) {
opt &= ~GREP_OPT_n;
lines_before = 0;
lines_after = 0;
} else if(lines_before > 0)
before_buf = (char **)xzalloc(lines_before * sizeof(char *));
}
#else
/* with auto sanity checks */
bb_opt_complementally = "H-h:e::f::c-n:q-n:l-n";
@ -348,11 +359,12 @@ int grep_main(int argc, char **argv)
if(ENABLE_FEATURE_GREP_FGREP_ALIAS && bb_applet_name[0] == 'f')
opt |= GREP_OPT_F;
if(!(opt & GREP_OPT_o))
reflags = REG_NOSUB;
if(ENABLE_FEATURE_GREP_EGREP_ALIAS &&
(bb_applet_name[0] == 'e' || (opt & GREP_OPT_E)))
reflags = REG_EXTENDED | REG_NOSUB;
else
reflags = REG_NOSUB;
reflags |= REG_EXTENDED;
if(opt & GREP_OPT_i)
reflags |= REG_ICASE;