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/* grep.c - print lines what match given regular expression
*
* Copyright 2013 CE Strake <strake888 at gmail.com>
*
* See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/grep.html
USE_GREP(NEWTOY(grep, "EFHabhinosvwclqe*f*m#x[!wx][!EFw]", TOYFLAG_BIN))
USE_GREP(OLDTOY(egrep, grep, OPTSTR_grep, TOYFLAG_BIN))
USE_GREP(OLDTOY(fgrep, grep, OPTSTR_grep, TOYFLAG_BIN))
config GREP
bool "grep"
default n
help
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.
Returns 0 if matched, 1 if no match found.
-e Regex to match. (May be repeated.)
-f File containing regular expressions to match.
match type:
-E extended regex syntax -F fixed (match literal string)
-i case insensitive -v invert match
-w whole word (implies -E) -m stop after this many lines matched
-x whole line
display modes: (default: matched line)
-c count of matching lines -l show matching filenames
-o only matching part -q quiet (errors only)
-s silent (no error msg)
prefix modes (default: filename if checking more than 1 file)
-H force filename -b byte offset of match
-h hide filename -n line number of match
*/
#define FOR_grep
#include "toys.h"
#include <regex.h>
GLOBALS(
long m;
struct arg_list *f;
struct arg_list *e;
char *regstr;
)
static void do_grep(int fd, char *name)
{
FILE *file = fdopen(fd, "r");
long offset = 0;
int lcount = 0, mcount = 0, which = toys.optflags & FLAG_w ? 2 : 0;
if (!file) {
perror_msg("%s", name);
return;
}
for (;;) {
char *line = 0, *start;
regmatch_t matches[3];
size_t unused;
long len;
lcount++;
if (0 > (len = getline(&line, &unused, file))) break;
if (line[len-1] == '\n') line[len-1] = 0;
start = line;
for (;;)
{
int rc = 0, skip = 0;
if (toys.optflags & FLAG_F) {
struct arg_list *seek;
char *s = 0;
for (seek = TT.e; seek; seek = seek->next) {
if (toys.optflags & FLAG_i) {
long ll = strlen(seek->arg);;
// Alas, posix hasn't got strcasestr()
for (s = line; *s; s++) if (!strncasecmp(s, seek->arg, ll)) break;
if (!*s) s = 0;
} else s = strstr(line, seek->arg);
if (s) break;
}
if (s) {
matches[which].rm_so = (s-line);
skip = matches[which].rm_eo = (s-line)+strlen(seek->arg);
} else rc = 1;
} else {
rc = regexec((regex_t *)toybuf, start, 3, matches,
start==line ? 0 : REG_NOTBOL);
skip = matches[which].rm_eo;
}
if (toys.optflags & FLAG_x)
if (matches[which].rm_so || line[matches[which].rm_eo]) rc = 1;
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();
}
if (toys.optflags & FLAG_l) {
printf("%s\n", name);
free(line);
fclose(file);
return;
}
if (!(toys.optflags & FLAG_c)) {
if (!(toys.optflags & FLAG_h)) printf("%s:", name);
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 {
xprintf("%.*s\n", matches[which].rm_eo - matches[which].rm_so,
start + matches[which].rm_so);
}
}
start += skip;
if (!(toys.optflags & FLAG_o) || !*start) break;
}
offset += len;
free(line);
if ((toys.optflags & FLAG_m) && mcount >= TT.m) break;
}
if (toys.optflags & FLAG_c) {
if (!(toys.optflags & FLAG_h)) printf("%s:", name);
xprintf("%d\n", mcount);
}
// loopfiles will also close the fd, but this frees an (opaque) struct.
fclose(file);
}
static void parse_regex(void)
{
struct arg_list *al;
long len = 0;
char *s, *ss;
// Add all -f lines to -e list. (Yes, this is leaking allocation context for
// exit to free. Not supporting nofork for this command any time soon.)
for (al = TT.f; al; al = al->next) {
s = ss = xreadfile(al->arg);
while (ss && *s) {
ss = strchr(s, '\n');
if (ss) *ss = 0;
al = xmalloc(sizeof(struct arg_list));
al->next = TT.e;
al->arg = s;
TT.e = al;
s = ss;
}
}
if (!(toys.optflags & FLAG_F)) {
int w = toys.optflags & FLAG_w;
// Convert strings to one big regex string.
for (al = TT.e; al; al = al->next) len += strlen(al->arg)+1;
if (w) len = 36;
TT.regstr = s = xmalloc(len);
if (w) s = stpcpy(s, "(^|[^_[:alnum:]])(");
for (al = TT.e; al; al = al->next) {
s = stpcpy(s, al->arg);
*(s++) = '|';
}
*(--s) = 0;
if (w) strcpy(s, ")($|[^_[:alnum:]])");
w = regcomp((regex_t *)toybuf, TT.regstr,
((toys.optflags & FLAG_E) ? REG_EXTENDED : 0) |
((toys.optflags & FLAG_i) ? REG_ICASE : 0));
if (w) {
regerror(w, (regex_t *)toybuf, toybuf+sizeof(regex_t),
sizeof(toybuf)-sizeof(regex_t));
error_exit("bad REGEX: %s", toybuf);
}
}
}
void grep_main(void)
{
// 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;
if (!TT.e && !TT.f) {
if (!*toys.optargs) error_exit("no REGEX");
TT.e = xzalloc(sizeof(struct arg_list));
TT.e->arg = *(toys.optargs++);
toys.optc--;
}
parse_regex();
if (!(toys.optflags & FLAG_H) && (toys.optc < 2)) toys.optflags |= FLAG_h;
toys.exitval = 1;
if (toys.optflags & FLAG_s) {
close(2);
xopen("/dev/null", O_RDWR);
}
loopfiles_rw(toys.optargs, O_RDONLY, 0, 1, do_grep);
xexit();
}
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