mirror of
https://git.busybox.net/busybox.git
synced 2024-11-24 14:13:26 +08:00
grep: implement -m MAX_MATCHES; fix help text
grep_file 771 822 +51 packed_usage 22573 22610 +37 .rodata 128058 128090 +32 grep_main 842 853 +11 max_matches - 4 +4 ------------------------------------------------------------------------------ (add/remove: 1/0 grow/shrink: 4/0 up/down: 135/0) Total: 135 bytes
This commit is contained in:
Denis Vlasenko
parent
8d5aa870a6
commit
4652daace9
@ -24,7 +24,7 @@
|
||||
|
||||
/* options */
|
||||
#define OPTSTR_GREP \
|
||||
"lnqvscFiHhe:f:Lor" \
|
||||
"lnqvscFiHhe:f:Lorm:" \
|
||||
USE_FEATURE_GREP_CONTEXT("A:B:C:") \
|
||||
USE_FEATURE_GREP_EGREP_ALIAS("E") \
|
||||
USE_DESKTOP("w") \
|
||||
@ -33,26 +33,27 @@
|
||||
/* ignored: -I "assume binary files have no matches" */
|
||||
|
||||
enum {
|
||||
OPTBIT_l,
|
||||
OPTBIT_n,
|
||||
OPTBIT_q,
|
||||
OPTBIT_v,
|
||||
OPTBIT_s,
|
||||
OPTBIT_c,
|
||||
OPTBIT_F,
|
||||
OPTBIT_i,
|
||||
OPTBIT_H,
|
||||
OPTBIT_h,
|
||||
OPTBIT_e,
|
||||
OPTBIT_f,
|
||||
OPTBIT_L,
|
||||
OPTBIT_o,
|
||||
OPTBIT_r,
|
||||
USE_FEATURE_GREP_CONTEXT( OPTBIT_A ,)
|
||||
USE_FEATURE_GREP_CONTEXT( OPTBIT_B ,)
|
||||
USE_FEATURE_GREP_CONTEXT( OPTBIT_C ,)
|
||||
USE_FEATURE_GREP_EGREP_ALIAS(OPTBIT_E ,)
|
||||
USE_DESKTOP( OPTBIT_w ,)
|
||||
OPTBIT_l, /* list matched file names only */
|
||||
OPTBIT_n, /* print line# */
|
||||
OPTBIT_q, /* quiet - exit(0) 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 */
|
||||
OPT_l = 1 << OPTBIT_l,
|
||||
OPT_n = 1 << OPTBIT_n,
|
||||
OPT_q = 1 << OPTBIT_q,
|
||||
@ -68,6 +69,7 @@ enum {
|
||||
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,
|
||||
@ -85,6 +87,7 @@ enum {
|
||||
|
||||
typedef unsigned char byte_t;
|
||||
|
||||
static int max_matches;
|
||||
static int reflags;
|
||||
static byte_t invert_search;
|
||||
static byte_t print_filename;
|
||||
@ -97,7 +100,6 @@ static int lines_after;
|
||||
static char **before_buf;
|
||||
static int last_line_printed;
|
||||
#endif /* ENABLE_FEATURE_GREP_CONTEXT */
|
||||
|
||||
/* globals used internally */
|
||||
static llist_t *pattern_head; /* growable list of patterns to match */
|
||||
static const char *cur_file; /* the current file we are reading */
|
||||
@ -146,6 +148,8 @@ static int grep_file(FILE *file)
|
||||
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 ((line = xmalloc_getline(file)) != NULL) {
|
||||
@ -212,6 +216,12 @@ static int grep_file(FILE *file)
|
||||
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
|
||||
@ -255,7 +265,7 @@ static int grep_file(FILE *file)
|
||||
#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 /* && (last_line_printed != linenum) */ ) {
|
||||
if (print_n_lines_after) {
|
||||
print_line(line, linenum, '-');
|
||||
print_n_lines_after--;
|
||||
} else if (lines_before) {
|
||||
@ -264,12 +274,17 @@ static int grep_file(FILE *file)
|
||||
before_buf[curpos] = line;
|
||||
curpos = (curpos + 1) % lines_before;
|
||||
/* avoid free(line) - we took line */
|
||||
continue;
|
||||
line = NULL;
|
||||
}
|
||||
}
|
||||
|
||||
#endif /* ENABLE_FEATURE_GREP_CONTEXT */
|
||||
free(line);
|
||||
|
||||
/* Did we print all context after last requested match? */
|
||||
if ((option_mask32 & OPT_m)
|
||||
&& !print_n_lines_after && nmatches == max_matches)
|
||||
break;
|
||||
}
|
||||
|
||||
/* special-case file post-processing for options where we don't print line
|
||||
@ -311,7 +326,6 @@ static char * add_grep_list_data(char *pattern)
|
||||
return (char *)gl;
|
||||
}
|
||||
|
||||
|
||||
static void load_regexes_from_file(llist_t *fopt)
|
||||
{
|
||||
char *line;
|
||||
@ -365,6 +379,7 @@ int grep_main(int argc, char **argv)
|
||||
{
|
||||
FILE *file;
|
||||
int matched;
|
||||
char *mopt;
|
||||
llist_t *fopt = NULL;
|
||||
|
||||
/* do normal option parsing */
|
||||
@ -376,7 +391,7 @@ int grep_main(int argc, char **argv)
|
||||
opt_complementary = "H-h:e::f::C-AB";
|
||||
getopt32(argc, argv,
|
||||
OPTSTR_GREP,
|
||||
&pattern_head, &fopt,
|
||||
&pattern_head, &fopt, &mopt,
|
||||
&slines_after, &slines_before, &Copt);
|
||||
|
||||
if (option_mask32 & OPT_C) {
|
||||
@ -405,8 +420,11 @@ int grep_main(int argc, char **argv)
|
||||
/* with auto sanity checks */
|
||||
opt_complementary = "H-h:e::f::c-n:q-n:l-n";
|
||||
getopt32(argc, argv, OPTSTR_GREP,
|
||||
&pattern_head, &fopt);
|
||||
&pattern_head, &fopt, &mopt);
|
||||
#endif
|
||||
if (option_mask32 & OPT_m) {
|
||||
max_matches = xatoi_u(mopt);
|
||||
}
|
||||
invert_search = ((option_mask32 & OPT_v) != 0); /* 0 | 1 */
|
||||
|
||||
if (pattern_head != NULL) {
|
||||
@ -487,12 +505,7 @@ int grep_main(int argc, char **argv)
|
||||
}
|
||||
matched += grep_file(file);
|
||||
fclose_if_not_stdin(file);
|
||||
grep_done:
|
||||
if (matched < 0) {
|
||||
/* we found a match but were told to be quiet, stop here and
|
||||
* return success */
|
||||
break;
|
||||
}
|
||||
grep_done: ;
|
||||
}
|
||||
|
||||
/* destroy all the elments in the pattern list */
|
||||
@ -512,10 +525,6 @@ int grep_main(int argc, char **argv)
|
||||
}
|
||||
}
|
||||
/* 0 = success, 1 = failed, 2 = error */
|
||||
/* If the -q option is specified, the exit status shall be zero
|
||||
* if an input line is selected, even if an error was detected. */
|
||||
if (BE_QUIET && matched)
|
||||
return 0;
|
||||
if (open_errors)
|
||||
return 2;
|
||||
return !matched; /* invert return value 0 = success, 1 = failed */
|
||||
|
||||
@ -1164,14 +1164,15 @@
|
||||
"\n -v Select non-matching lines" \
|
||||
"\n -s Suppress file open/read error messages" \
|
||||
"\n -c Only print count of matching lines" \
|
||||
"\n -f Read PATTERN from file" \
|
||||
"\n -o Show only the part of a line that matches PATTERN" \
|
||||
"\n -m MAX Match up to MAX times per file" \
|
||||
USE_DESKTOP( \
|
||||
"\n -w Match whole words only") \
|
||||
"\n -e PATTERN is a regular expression" \
|
||||
"\n -F PATTERN is a set of newline-separated strings" \
|
||||
USE_FEATURE_GREP_EGREP_ALIAS( \
|
||||
"\n -E PATTERN is an extended regular expression") \
|
||||
"\n -e PTRN Pattern to match" \
|
||||
"\n -f FILE Read pattern from file" \
|
||||
USE_FEATURE_GREP_CONTEXT( \
|
||||
"\n -A Print NUM lines of trailing context" \
|
||||
"\n -B Print NUM lines of leading context" \
|
||||
|
||||
Loading…
Reference in New Issue
Block a user