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authorJim Meyering <jim@meyering.net>1998-12-31 17:53:59 +0000
committerJim Meyering <jim@meyering.net>1998-12-31 17:53:59 +0000
commita58c222775cc2937c6f4836cc82bdb4547710986 (patch)
tree92b57714ba2208fab0f8133f5608d54ce8b93d09 /lib/strncasecmp.c
parent44538bbbd8cd85adf0e880094cbbbc47c2004e25 (diff)
downloadcoreutils-a58c222775cc2937c6f4836cc82bdb4547710986.tar.xz
*** empty log message ***
Diffstat (limited to 'lib/strncasecmp.c')
-rw-r--r--lib/strncasecmp.c34
1 files changed, 34 insertions, 0 deletions
diff --git a/lib/strncasecmp.c b/lib/strncasecmp.c
new file mode 100644
index 000000000..55c0f2ee3
--- /dev/null
+++ b/lib/strncasecmp.c
@@ -0,0 +1,34 @@
+#if HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <sys/types.h>
+#include <ctype.h>
+
+#define TOLOWER(Ch) (isupper (Ch) ? tolower (Ch) : (Ch))
+
+/* Compare no more than N characters of S1 and S2,
+ ignoring case, returning less than, equal to or
+ greater than zero if S1 is lexicographically less
+ than, equal to or greater than S2. */
+
+int
+strncasecmp (const char *s1, const char *s2, size_t n)
+{
+ register const unsigned char *p1 = (const unsigned char *) s1;
+ register const unsigned char *p2 = (const unsigned char *) s2;
+ unsigned char c1, c2;
+
+ if (p1 == p2 || n == 0)
+ return 0;
+
+ do
+ {
+ c1 = TOLOWER (*p1++);
+ c2 = TOLOWER (*p2++);
+ if (c1 == '\0' || c1 != c2)
+ return c1 - c2;
+ } while (--n > 0);
+
+ return c1 - c2;
+}