https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=72641 (sent upstream)

--- grep-2.5.1/src/grep.c.oi	2002-10-13 20:58:55.000000000 +0100

+++ grep-2.5.1/src/grep.c	2002-10-13 21:02:43.000000000 +0100

@@ -533,6 +533,37 @@

     {

       size_t match_size;

       size_t match_offset;

+      if(match_icase)

+        {

+          char *buf = (char*) xmalloc (lim - beg);

+	  char *ibeg = buf;

+	  char *ilim = ibeg + (lim - beg);

+	  int i;

+	  for (i = 0; i < lim - beg; i++)

+	    ibeg[i] = tolower (beg[i]);

+

+	  while ((match_offset = (*execute) (ibeg, lim - beg, &match_size, 1))

+		 != (size_t) -1)

+	    {

+	      char const *b = ibeg + match_offset;

+	      if (b == lim)

+		break;

+	      if (match_size == 0)

+		break;

+	      if(color_option)

+		printf("\33[%sm", grep_color);

+	      fwrite(b, sizeof (char), match_size, stdout);

+	      if(color_option)

+		fputs("\33[00m", stdout);

+	      fputs("\n", stdout);

+	      ibeg = b + match_size;

+	    }

+	  free (buf);

+	  lastout = lim;

+	  if(line_buffered)

+	    fflush(stdout);

+	  return;

+	}

       while ((match_offset = (*execute) (beg, lim - beg, &match_size, 1))

 	  != (size_t) -1)

         {