Revert "Remove libberty."

[pf3gnuchains/pf3gnuchains4x.git] / libiberty / strncasecmp.c

diff --git a/libiberty/strncasecmp.c b/libiberty/strncasecmp.c
new file mode 100644 (file)
index 0000000..47700dd
--- /dev/null
+++ b/libiberty/strncasecmp.c
@@ -0,0 +1,86 @@
+/*
+ * Copyright (c) 1987 Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that this notice is preserved and that due credit is given
+ * to the University of California at Berkeley. The name of the University
+ * may not be used to endorse or promote products derived from this
+ * software without specific written prior permission. This software
+ * is provided ``as is'' without express or implied warranty.
+ */
+
+/*
+  
+@deftypefn Supplemental int strncasecmp (const char *@var{s1}, const char *@var{s2})
+
+A case-insensitive @code{strncmp}.
+
+@end deftypefn
+
+*/
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static char sccsid[] = "@(#)strcasecmp.c       5.5 (Berkeley) 11/24/87";
+#endif /* LIBC_SCCS and not lint */
+
+#include <ansidecl.h>
+#include <stddef.h>
+
+/*
+ * This array is designed for mapping upper and lower case letter
+ * together for a case independent comparison.  The mappings are
+ * based upon ascii character sequences.
+ */
+static const unsigned char charmap[] = {
+       '\000', '\001', '\002', '\003', '\004', '\005', '\006', '\007',
+       '\010', '\011', '\012', '\013', '\014', '\015', '\016', '\017',
+       '\020', '\021', '\022', '\023', '\024', '\025', '\026', '\027',
+       '\030', '\031', '\032', '\033', '\034', '\035', '\036', '\037',
+       '\040', '\041', '\042', '\043', '\044', '\045', '\046', '\047',
+       '\050', '\051', '\052', '\053', '\054', '\055', '\056', '\057',
+       '\060', '\061', '\062', '\063', '\064', '\065', '\066', '\067',
+       '\070', '\071', '\072', '\073', '\074', '\075', '\076', '\077',
+       '\100', '\141', '\142', '\143', '\144', '\145', '\146', '\147',
+       '\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157',
+       '\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167',
+       '\170', '\171', '\172', '\133', '\134', '\135', '\136', '\137',
+       '\140', '\141', '\142', '\143', '\144', '\145', '\146', '\147',
+       '\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157',
+       '\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167',
+       '\170', '\171', '\172', '\173', '\174', '\175', '\176', '\177',
+       '\200', '\201', '\202', '\203', '\204', '\205', '\206', '\207',
+       '\210', '\211', '\212', '\213', '\214', '\215', '\216', '\217',
+       '\220', '\221', '\222', '\223', '\224', '\225', '\226', '\227',
+       '\230', '\231', '\232', '\233', '\234', '\235', '\236', '\237',
+       '\240', '\241', '\242', '\243', '\244', '\245', '\246', '\247',
+       '\250', '\251', '\252', '\253', '\254', '\255', '\256', '\257',
+       '\260', '\261', '\262', '\263', '\264', '\265', '\266', '\267',
+       '\270', '\271', '\272', '\273', '\274', '\275', '\276', '\277',
+       '\300', '\341', '\342', '\343', '\344', '\345', '\346', '\347',
+       '\350', '\351', '\352', '\353', '\354', '\355', '\356', '\357',
+       '\360', '\361', '\362', '\363', '\364', '\365', '\366', '\367',
+       '\370', '\371', '\372', '\333', '\334', '\335', '\336', '\337',
+       '\340', '\341', '\342', '\343', '\344', '\345', '\346', '\347',
+       '\350', '\351', '\352', '\353', '\354', '\355', '\356', '\357',
+       '\360', '\361', '\362', '\363', '\364', '\365', '\366', '\367',
+       '\370', '\371', '\372', '\373', '\374', '\375', '\376', '\377',
+};
+
+int
+strncasecmp(const char *s1, const char *s2, register size_t n)
+{
+    register unsigned char u1, u2;
+
+    for (; n != 0; --n) {
+       u1 = (unsigned char) *s1++;
+       u2 = (unsigned char) *s2++;
+       if (charmap[u1] != charmap[u2]) {
+           return charmap[u1] - charmap[u2];
+       }
+       if (u1 == '\0') {
+           return 0;
+       }
+    }
+    return 0;
+}