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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 [-clq] [-EFHbhinosvw] (-e RE | -f REfile | RE) [file...]
modes:
default: print lines from each file what match regular expression RE.
-c: print the number of matching lines in each file.
-l: print all matching file names.
-q: print nil; quit with code 0 when match found.
flags:
-E: extended RE syntax
-F: fixed RE syntax, i.e. all characters literal
-H: print file name
-b: print byte offset of match
-h: not print file name
-i: case insensitive
-n: print line numbers
-o: print only matching part
-s: keep silent on error
-v: invert match
-w: match full word only
*/
#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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