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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/
* See http://refspecs.linuxfoundation.org/LSB_4.1.0/LSB-Core-generic/LSB-Core-generic/cmdbehav.html
USE_GREP(NEWTOY(grep, "EFHabhinosvwclqe*f*m#", TOYFLAG_BIN))
config GREP
bool "grep"
default n
help
usage: grep [-EFivw] [-cloqs] [-Hbhn] [-e REGEX]... [-f FILENAME] [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 words (implies -E)
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>
static regex_t re; /* fails in GLOBALS */
GLOBALS(
long mArgu;
struct arg_list *fArgu, *eArgu;
char mode, *re_xs;
)
static void do_grep(int fd, char *name)
{
int n = 0, nMatch = 0, which = toys.optflags & FLAG_w ? 2 : 0;
for (;;) {
char *x, *y;
regmatch_t matches[3];
int atBOL = 1;
x = get_rawline(fd, 0, '\n');
if (!x) break;
y = x;
n++; /* start at 1 */
while (regexec (&re, y, 3, matches, atBOL ? 0 : REG_NOTBOL) == 0)
{
if (atBOL) nMatch++;
toys.exitval = 0;
atBOL = 0;
switch (TT.mode) {
case 'q':
xexit();
case 'l':
if (!(toys.optflags & FLAG_h)) printf("%s\n", name);
free(x);
return;
case 'c':
break;
default:
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);
else {
y += matches[which].rm_so;
printf("%.*s\n", matches[which].rm_eo - matches[which].rm_so, y++);
}
}
if (!(toys.optflags & FLAG_o)) break;
}
free(x);
if ((toys.optflags & FLAG_m) && nMatch >= TT.mArgu) break;
}
if (TT.mode == 'c') printf("%s:%d\n", name, nMatch);
}
char *regfix(char *re_xs)
{
char *re_ys;
int ii, jj = 0;
re_ys = xmalloc(2*strlen (re_xs) + 1);
for (ii = 0; re_xs[ii]; ii++) {
if (strchr("^.[]$()|*+?{}\\", re_xs[ii])) re_ys[jj++] = '\\';
re_ys[jj++] = re_xs[ii];
}
re_ys[jj] = 0;
return re_ys;
}
void addRE(char *x)
{
if (toys.optflags & FLAG_F) x = regfix(x);
if (TT.re_xs) TT.re_xs = xastrcat(TT.re_xs, "|");
TT.re_xs = xastrcat(TT.re_xs, x);
if (toys.optflags & FLAG_F) free(x);
}
void buildRE(void)
{
for (; TT.eArgu; TT.eArgu = TT.eArgu -> next) addRE(TT.eArgu -> arg);
for (; TT.fArgu; TT.fArgu = TT.fArgu -> next) {
FILE *f;
char *x, *y;
size_t l;
f = xfopen(TT.fArgu -> arg, "r");
x = 0;
for (;;) {
if (getline (&x, &l, f) < 0) {
if (feof(f)) break;
toys.exitval = 2;
perror_exit("failed to read");
}
y = x + strlen(x) - 1;
if (y[0] == '\n') y[0] = 0;
addRE(x);
}
free(x);
fclose(f);
}
if (!TT.re_xs) {
if (toys.optc < 1) {
toys.exitval = 2;
error_exit("no RE");
}
TT.re_xs = (toys.optflags & FLAG_F) ? regfix(toys.optargs[0])
: toys.optargs[0];
toys.optc--; toys.optargs++;
}
TT.re_xs = xmsprintf((toys.optflags & FLAG_w)
? "(^|[^_[:alnum:]])(%s)($|[^_[:alnum:]])" : "%s", TT.re_xs);
if (regcomp(&re, TT.re_xs,
((toys.optflags & (FLAG_E | FLAG_F)) ? REG_EXTENDED : 0) |
((toys.optflags & FLAG_i) ? REG_ICASE : 0)) != 0) {
toys.exitval = 2;
error_exit("bad RE");
}
}
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");
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);
xexit();
}
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