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From: chip@pedsgo.UUCP
Newsgroups: comp.lang.c
Subject: ignore case option for grep
Message-ID: <745@pedsgo.UUCP>
Date: Wed, 18-Mar-87 09:09:07 EST
Article-I.D.: pedsgo.745
Posted: Wed Mar 18 09:09:07 1987
Date-Received: Sat, 21-Mar-87 04:41:07 EST
Distribution: na
Organization: Concurrent Computer Corp. Tinton Falls, N.J.
Lines: 78

Way back when I was using an Altos 586 running Xenix 2.something or
other, I became dependent on the -y option for grep which ignores case
when doing its pattern match.  When I came to the wonderful world of
sysV, I was disapointed to learn that the -y option was not supported,
meaning I couldn't use shell scripts I wrote under Xenix.  So, I took
the source to grep and modified it to suite my needs, to which I am 
supplying the diff below.  The major modifications are in <regexp.h>
and I wasn't about to change the actual file, so, in grep.c where it
says #include <regexp.h> I read in the actual source.  Tacky, sloppy,
and unprofessional yes, but it got the job done.  If anyone can see
any dangerous side effects from what I did, I would surely appreciate
knowing so.  It seems harmless enough, but you never know.
Of course, this should NOT replace /bin/grep, but it could be placed 
somewhere where it can be used in a productive manner.

I wasn't sure as to whether to post this to net.sources, 
comp.unix.questions, or comp.lang.c.   Flames about wrong newsgroups
to /dev/null&void please.

Note that the diff is on grep.c after regexp.h has been read in.
Also note that actual line numbers may be different due to proprietary
comments and other garbage placed in grep.c and regexp.h.

$diff grep.c grep.c.old
----------------------------- begin grep.diff -----------------------
46d45
< int yflag;
310,318c309,310
< 			if (!yflag){
< 				if(*p1 != c)
< 					continue;
< 				}
< 			else{
< 				if(toupper(*p1) != toupper(c))
< 					continue;
< 				}
< 	
---
> 			if(*p1 != c)
> 				continue;
341d332
< 	char side1, side2;
349,360c340,341
< 			if(!yflag){
< 				if(*ep++ == *lp++)
< 					continue;
< 				}
< 			else {
< 				side1=(isupper(*ep)) ? *ep : toupper(*ep);
< 				ep++;
< 				side2=(isupper(*lp)) ? *lp : toupper(*lp);
< 				lp++;
< 				if(side1 == side2)
< 					continue
< 				}
---
> 			if(*ep++ == *lp++)
> 				continue;
502a484
> 
552c534
< 	while((c=getopt(argc, argv, "blcnsviy")) != EOF)
---
> 	while((c=getopt(argc, argv, "blcnsvi")) != EOF)
563,565d544
< 		case 'y':
< 			yflag++;
< 			break;
583c562
< 		errmsg("Usage: grep -blcnsviy pattern file . . .\n",
---
> 		errmsg("Usage: grep -blcnsvi pattern file . . .\n",
---------------------------- end grep.diff ----------------------------
-- 
| Chip Maurer                                      |
| Concurrent Computer Corporation                  |
| Tinton Falls, NJ                                 |
| {topaz|hjuxa|vax135}!petsd!{pedsgo|pedsga}!chip  |