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-rw-r--r--strneqlen.c45
1 files changed, 45 insertions, 0 deletions
diff --git a/strneqlen.c b/strneqlen.c
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--- /dev/null
+++ b/strneqlen.c
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+/* See LICENSE file for copyright and license details. */
+#include "libsimple.h"
+#ifndef TEST
+
+
+size_t
+libsimple_strneqlen(const char *a, const char *b, size_t n)
+{
+ size_t i = 0;
+ for (; i < n && a[i] && a[i] == b[i]; i++);
+ return i;
+}
+
+
+#else
+#include "test.h"
+
+int
+main(void)
+{
+ char s[] = "abcdefgh", t[] = "abcdefgh";
+ size_t i, j, n;
+ for (n = 0; n < 10; n++) {
+ assert(libsimple_strneqlen("", "", n) == 0);
+ assert(libsimple_strneqlen("x", "", n) == 0);
+ assert(libsimple_strneqlen("x", "y", n) == 0);
+ assert(libsimple_strneqlen("", "y", n) == 0);
+ assert(libsimple_strneqlen("abc", "ABC", n) == 0);
+ assert(libsimple_strneqlen("ABC", "abc", n) == 0);
+ assert(libsimple_strneqlen("ABC", "ABC", n) == MIN(n, 3));
+ assert(libsimple_strneqlen("123", "123", n) == MIN(n, 3));
+ for (i = 0; i <= 8; i++) {
+ for (j = 0; j <= 8; j++) {
+ assert(libsimple_strneqlen(&s[i], &t[j], n) == MIN(i == j ? 8 - i : 0, n));
+ s[i] = t[j] = '\0';
+ assert(libsimple_strneqlen(s, t, n) == MIN(i < j ? i : j, n));
+ s[i] = "abcdefgh"[i];
+ t[j] = "abcdefgh"[j];
+ }
+ }
+ }
+ return 0;
+}
+
+#endif