[src/trunk]: src/distrib/utils/libhack Make this at least work for ASCII stri...

[martin <martin%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/a51d6043bcf2
branches:  trunk
changeset: 458833:a51d6043bcf2
user:      martin <martin%NetBSD.org@localhost>
date:      Mon Aug 12 09:34:53 2019 +0000

description:
Make this at least work for ASCII strings (there are way more users
than libcurses in various crunched environments, so the original assumption
of a very limited set of inputs was wrong).

diffstat:

 distrib/utils/libhack/strcasecmp.c |  20 ++++++++++++++------
 1 files changed, 14 insertions(+), 6 deletions(-)

diffs (36 lines):

diff -r a9b871d05fba -r a51d6043bcf2 distrib/utils/libhack/strcasecmp.c
--- a/distrib/utils/libhack/strcasecmp.c        Mon Aug 12 09:18:30 2019 +0000
+++ b/distrib/utils/libhack/strcasecmp.c        Mon Aug 12 09:34:53 2019 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: strcasecmp.c,v 1.1 2019/07/28 10:21:18 martin Exp $    */
+/*     $NetBSD: strcasecmp.c,v 1.2 2019/08/12 09:34:53 martin Exp $    */
 
 /*
  * Written by Martin Husemann <martin%NetBSD.org@localhost>
@@ -8,13 +8,21 @@
 #include <strings.h>
 
 /*
- * Cheap and dirty strcasecmp() - implements just enough
- * for our libcurses in crunched environments: since we
- * know all compared strings are fixed, uppercase, and plain ASCII,
- * just use strcmp()
+ * Simple strcasecmp, try to avoid pulling in real locales
  */
 int
 strcasecmp(const char *s1, const char *s2)
 {
-       return strcmp(s1, s2);
+       unsigned int c1, c2;
+
+       do {
+               c1 = *s1++;
+               c2 = *s2++;
+               if (c1 >= 'A' && c1 <= 'Z')
+                       c1 += 'a' - 'A';
+               if (c2 >= 'A' && c2 <= 'Z')
+                       c2 += 'a' - 'A';
+       } while (c1 == c2 && c1 != 0 && c2 != 0);
+
+       return ((c1 == c2) ? 0 : ((c1 > c2) ? 1 : -1));
 }