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-rw-r--r--toys/pending/grep.c119
1 files changed, 75 insertions, 44 deletions
diff --git a/toys/pending/grep.c b/toys/pending/grep.c
index ed13c393..626ec027 100644
--- a/toys/pending/grep.c
+++ b/toys/pending/grep.c
@@ -2,16 +2,17 @@
*
* Copyright 2013 CE Strake <strake888 at gmail.com>
*
- * See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/
- * See http://refspecs.linuxfoundation.org/LSB_4.1.0/LSB-Core-generic/LSB-Core-generic/cmdbehav.html
+ * See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/grep.html
USE_GREP(NEWTOY(grep, "EFHabhinosvwclqe*f*m#", TOYFLAG_BIN))
+USE_GREP(OLDTOY(egrep, grep, "EFHabhinosvwclqe*f*m#", TOYFLAG_BIN))
+USE_GREP(OLDTOY(fgrep, grep, "EFHabhinosvwclqe*f*m#", TOYFLAG_BIN))
config GREP
bool "grep"
default n
help
- usage: grep [-EFivw] [-cloqs] [-Hbhn] [-e REGEX]... [-f FILENAME] [FILE]...
+ usage: grep [-EFivwcloqsHbhn] [-m MAX] [-e REGEX]... [-f REGFILE] [FILE]...
Show lines matching regular expressions. If no -e, first argument is
regular expression to match. With no files (or "-" filename) read stdin.
@@ -23,7 +24,7 @@ config GREP
match type:
-E extended regex syntax -F fixed (match literal string)
-i case insensitive -v invert match
- -w whole words (implies -E)
+ -w whole words (implies -E) -m stop after this many lines matched
display modes: (default: matched line)
-c count of matching lines -l show matching filenames
@@ -42,60 +43,89 @@ config GREP
static regex_t re; /* fails in GLOBALS */
GLOBALS(
- long mArgu;
+ long m;
+
struct arg_list *fArgu, *eArgu;
- char mode, *re_xs;
+ char *re_xs;
)
static void do_grep(int fd, char *name)
{
- int n = 0, nMatch = 0, which = toys.optflags & FLAG_w ? 2 : 0;
+ FILE *file = xfdopen(fd, "r");
+ long offset = 0;
+ int lcount = 0, mcount = 0, which = toys.optflags & FLAG_w ? 2 : 0;
for (;;) {
- char *x, *y;
+ char *line = 0, *start;
regmatch_t matches[3];
- int atBOL = 1;
+ size_t len;
- x = get_rawline(fd, 0, '\n');
- if (!x) break;
- y = x;
- n++; /* start at 1 */
+ lcount++;
+ if (-1 == getline(&line, &len, file)) break;
+ len = strlen(line);
+ if (len && line[len-1] == '\n') line[len-1] = 0;
+ start = line;
- while (regexec (&re, y, 3, matches, atBOL ? 0 : REG_NOTBOL) == 0)
+ for (;;)
{
- if (atBOL) nMatch++;
- toys.exitval = 0;
- atBOL = 0;
- switch (TT.mode) {
- case 'q':
+ int rc = regexec(&re, start, 3, matches, start == line ? 0 : REG_NOTBOL);
+ int skip = matches[which].rm_eo;
+
+ if (toys.optflags & FLAG_v) {
+ if (toys.optflags & FLAG_o) {
+ if (rc) skip = matches[which].rm_eo = strlen(start);
+ else if (!matches[which].rm_so) {
+ start += skip;
+ continue;
+ } else matches[which].rm_eo = matches[which].rm_so;
+ } else {
+ if (!rc) break;
+ matches[which].rm_eo = strlen(start);
+ }
+ matches[which].rm_so = 0;
+ } else if (rc) break;
+
+ mcount++;
+ if (toys.optflags & FLAG_q) {
+ toys.exitval = 0;
xexit();
- case 'l':
- if (!(toys.optflags & FLAG_h)) printf("%s\n", name);
- free(x);
+ }
+ if (toys.optflags & FLAG_l) {
+ printf("%s\n", name);
+ free(line);
+ fclose(file);
return;
- case 'c':
- break;
- default:
+ }
+ if (!(toys.optflags & FLAG_c)) {
if (!(toys.optflags & FLAG_h)) printf("%s:", name);
- if ((toys.optflags & FLAG_n)) printf("%d:", n);
- if ((toys.optflags & FLAG_b))
- printf("%ld:", lseek (0, 0, SEEK_CUR) - strlen (y) +
- (toys.optflags & FLAG_o ? matches[which].rm_so : 0));
- if (!(toys.optflags & FLAG_o)) fputs(x, stdout);
+ if (toys.optflags & FLAG_n) printf("%d:", lcount);
+ if (toys.optflags & FLAG_b)
+ printf("%ld:", offset + (start-line) +
+ ((toys.optflags & FLAG_o) ? matches[which].rm_so : 0));
+ if (!(toys.optflags & FLAG_o)) xputs(line);
else {
- y += matches[which].rm_so;
- printf("%.*s\n", matches[which].rm_eo - matches[which].rm_so, y++);
+ xprintf("%.*s\n", matches[which].rm_eo - matches[which].rm_so,
+ start + matches[which].rm_so);
}
}
- if (!(toys.optflags & FLAG_o)) break;
+
+ start += skip;
+ if (!(toys.optflags & FLAG_o) || !*start) break;
}
+ offset += len;
- free(x);
+ free(line);
+
+ if ((toys.optflags & FLAG_m) && mcount >= TT.m) break;
+ }
- if ((toys.optflags & FLAG_m) && nMatch >= TT.mArgu) break;
+ if (toys.optflags & FLAG_c) {
+ if (!(toys.optflags & FLAG_h)) printf("%s:", name);
+ xprintf("%d\n", mcount);
}
- if (TT.mode == 'c') printf("%s:%d\n", name, nMatch);
+ // loopfiles will also close the fd, but this frees an (opaque) struct.
+ fclose(file);
}
char *regfix(char *re_xs)
@@ -169,19 +199,20 @@ void buildRE(void)
void grep_main(void)
{
- if ((toys.optflags & FLAG_w)
- && !(toys.optflags & FLAG_E || toys.optflags & FLAG_F))
- error_exit ("must not use -w sans -E");
+ // Handle egrep and fgrep
+ if (*toys.which->name == 'e' || (toys.optflags & FLAG_w))
+ toys.optflags |= FLAG_E;
+ if (*toys.which->name == 'f') toys.optflags |= FLAG_F;
buildRE();
- if (toys.optflags & FLAG_c) TT.mode = 'c';
- if (toys.optflags & FLAG_l) TT.mode = 'l';
- if (toys.optflags & FLAG_q) TT.mode = 'q';
-
if (!(toys.optflags & FLAG_H) && (toys.optc < 2)) toys.optflags |= FLAG_h;
toys.exitval = 1;
- loopfiles_rw(toys.optargs, O_RDONLY, 0, toys.optflags & FLAG_s, do_grep);
+ if (toys.optflags & FLAG_s) {
+ close(2);
+ xopen("/dev/null", O_RDWR);
+ }
+ loopfiles_rw(toys.optargs, O_RDONLY, 0, 1, do_grep);
xexit();
}