this was proposed a while ago, but got sidetracked by some nonstandard
option discussion. bringing it back in slightly different form.
-o only prints the matching parts of a line, not the entire line. While
this is possible using awk, the same could be said of everything grep
does. It is intended to match the behavior of the same option in gnu
grep.
Index: grep.1
===
RCS file: /home/tedu/cvs/src/usr.bin/grep/grep.1,v
retrieving revision 1.40
diff -u -r1.40 grep.1
--- grep.1 4 Mar 2011 03:11:22 - 1.40
+++ grep.1 20 Jun 2011 19:38:55 -
@@ -38,7 +38,7 @@
.Sh SYNOPSIS
.Nm grep
.Bk -words
-.Op Fl abcEFGHhIiLlnqRsUVvwxZ
+.Op Fl abcEFGHhIiLlnoqRsUVvwxZ
.Op Fl A Ar num
.Op Fl B Ar num
.Op Fl C Ns Op Ar num
@@ -228,6 +228,8 @@
.Fl q
is
specified.
+.It Fl o
+Print each match, but only the match, not the containing line.
.It Fl q
Quiet mode:
suppress normal output.
Index: grep.c
===
RCS file: /home/tedu/cvs/src/usr.bin/grep/grep.c,v
retrieving revision 1.43
diff -u -r1.43 grep.c
--- grep.c 4 Mar 2011 03:11:23 - 1.43
+++ grep.c 20 Jun 2011 19:36:39 -
@@ -74,6 +74,7 @@
int iflag; /* -i: ignore case */
int lflag; /* -l: only show names of files with matches */
int nflag; /* -n: show line numbers in front of matching lines */
+int oflag; /* -o: print each match */
int qflag; /* -q: quiet mode (don't output anything) */
int sflag; /* -s: silent mode (ignore errors) */
int vflag; /* -v: only show non-matching lines */
@@ -117,9 +118,9 @@
}
#ifdef NOZ
-static char *optstr = 0123456789A:B:CEFGHILRUVabce:f:hilnqrsuvwxy;
+static char *optstr = 0123456789A:B:CEFGHILRUVabce:f:hilnoqrsuvwxy;
#else
-static char *optstr = 0123456789A:B:CEFGHILRUVZabce:f:hilnqrsuvwxy;
+static char *optstr = 0123456789A:B:CEFGHILRUVZabce:f:hilnoqrsuvwxy;
#endif
struct option long_options[] =
@@ -382,6 +383,9 @@
break;
case 'n':
nflag = 1;
+ break;
+ case 'o':
+ oflag = 1;
break;
case 'q':
qflag = 1;
Index: grep.h
===
RCS file: /home/tedu/cvs/src/usr.bin/grep/grep.h,v
retrieving revision 1.16
diff -u -r1.16 grep.h
--- grep.h 4 Mar 2011 03:11:23 - 1.16
+++ grep.h 20 Jun 2011 19:34:58 -
@@ -65,7 +65,7 @@
/* Command line flags */
extern int Aflag, Bflag, Eflag, Fflag, Gflag, Hflag, Lflag,
Rflag, Zflag,
-bflag, cflag, hflag, iflag, lflag, nflag, qflag, sflag,
+bflag, cflag, hflag, iflag, lflag, nflag, oflag, qflag, sflag,
vflag, wflag, xflag;
extern int binbehave;
@@ -84,7 +84,7 @@
void *grep_malloc(size_t size);
void *grep_calloc(size_t nmemb, size_t size);
void *grep_realloc(void *ptr, size_t size);
-voidprintline(str_t *line, int sep);
+voidprintline(str_t *line, int sep, regmatch_t *pmatch);
int fastcomp(fastgrep_t *, const char *);
voidfgrepcomp(fastgrep_t *, const char *);
Index: queue.c
===
RCS file: /home/tedu/cvs/src/usr.bin/grep/queue.c,v
retrieving revision 1.5
diff -u -r1.5 queue.c
--- queue.c 9 Feb 2006 09:54:47 - 1.5
+++ queue.c 20 Jun 2011 19:33:23 -
@@ -107,7 +107,7 @@
queue_t *item;
while ((item = dequeue()) != NULL) {
- printline(item-data, '-');
+ printline(item-data, '-', NULL);
free_item(item);
}
}
Index: util.c
===
RCS file: /home/tedu/cvs/src/usr.bin/grep/util.c,v
retrieving revision 1.39
diff -u -r1.39 util.c
--- util.c 2 Jul 2010 22:18:03 - 1.39
+++ util.c 20 Jun 2011 19:34:30 -
@@ -48,9 +48,9 @@
static int linesqueued;
static int procline(str_t *l, int);
-static int grep_search(fastgrep_t *, unsigned char *, size_t, regmatch_t
*pmatch);
+static int grep_search(fastgrep_t *, char *, size_t, regmatch_t *pmatch);
#ifndef SMALL
-static int grep_cmp(const unsigned char *, const unsigned char *, size_t);
+static int grep_cmp(const char *, const char *, size_t);
static voidgrep_revstr(unsigned char *, int);
#endif
@@ -169,19 +169,25 @@
{
regmatch_t pmatch;
int c, i, r;
+ int offset;
+ c = 0;
+ i = 0;
if (matchall) {
- c = !vflag;
goto print;
}
- for (c = i = 0; i patterns; i++) {
+ for (i = 0; i patterns; i++) {
