1 files changed, 104 insertions, 0 deletions
diff --git a/string/test/strncmp.c b/string/test/strncmp.c
new file mode 100644
index 0000000..14e0a8c
--- /dev/null
+++ b/string/test/strncmp.c
@@ -0,0 +1,104 @@
+/*
+ * strncmp test.
+ *
+ * Copyright (c) 2019, Arm Limited.
+ * SPDX-License-Identifier: MIT
+ */
+
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "stringlib.h"
+
+static const struct fun
+{
+	const char *name;
+	int (*fun)(const char *, const char *, size_t);
+} funtab[] = {
+#define F(x) {#x, x},
+F(strncmp)
+#if __aarch64__
+F(__strncmp_aarch64)
+# if __ARM_FEATURE_SVE
+F(__strncmp_aarch64_sve)
+# endif
+#endif
+#undef F
+	{0, 0}
+};
+
+static int test_status;
+#define ERR(...) (test_status=1, printf(__VA_ARGS__))
+
+#define A 32
+#define LEN 250000
+static char s1buf[LEN+2*A];
+static char s2buf[LEN+2*A];
+
+static void *alignup(void *p)
+{
+	return (void*)(((uintptr_t)p + A-1) & -A);
+}
+
+static void test(const struct fun *fun, int s1align, int s2align, int maxlen, int diffpos, int len)
+{
+	char *src1 = alignup(s1buf);
+	char *src2 = alignup(s2buf);
+	char *s1 = src1 + s1align;
+	char *s2 = src2 + s2align;
+	int r;
+
+	if (len > LEN || s1align >= A || s2align >= A)
+		abort();
+	if (diffpos > 1 && diffpos >= len-1)
+		abort();
+
+	for (int i = 0; i < len+A; i++)
+		src1[i] = src2[i] = '?';
+	for (int i = 0; i < len-1; i++)
+		s1[i] = s2[i] = 'a' + i%23;
+	if (diffpos > 1)
+		s1[diffpos]++;
+	s1[len] = s2[len] = '\0';
+
+	r = fun->fun(s1, s2, maxlen);
+
+	diffpos = maxlen <= diffpos ? 0 : diffpos;
+
+	if (((diffpos <= 1) && r != 0) || (diffpos > 1 && r == 0)) {
+		ERR("%s(align %d, align %d, %d (%d)) failed, returned %d (%d)\n",
+			fun->name, s1align, s2align, maxlen, len, r, diffpos);
+		ERR("src1: %.*s\n", s1align+len+1, src1);
+		ERR("src2: %.*s\n", s2align+len+1, src2);
+	}
+}
+
+int main()
+{
+	int r = 0;
+	for (int i=0; funtab[i].name; i++) {
+		test_status = 0;
+		for (int d = 0; d < A; d++)
+			for (int s = 0; s < A; s++) {
+				int n;
+				for (n = 0; n < 100; n++) {
+					test(funtab+i, d, s, n,   0,   n);
+					test(funtab+i, d, s, n,   n/2, n);
+					test(funtab+i, d, s, n/2, 0,   n);
+					test(funtab+i, d, s, n/2, n/2, n);
+				}
+				for (; n < LEN; n *= 2) {
+					test(funtab+i, d, s, n,   0,   n);
+					test(funtab+i, d, s, n,   n/2, n);
+					test(funtab+i, d, s, n/2, 0,   n);
+					test(funtab+i, d, s, n/2, n/2, n);
+				}
+			}
+		if (test_status) {
+			r = -1;
+			ERR("FAIL %s\n", funtab[i].name);
+		}
+	}
+	return r;
+}