1 files changed, 46 insertions, 0 deletions
diff --git a/strtou8.c b/strtou8.c
new file mode 100644
index 0000000..2f299b4
--- /dev/null
+++ b/strtou8.c
@@ -0,0 +1,46 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+#ifndef TEST
+
+#define RET_MAX 255ULL
+
+
+uint_least8_t
+libsimple_strtou8(const char *restrict nptr, char **restrict end, int base)
+{
+	uintmax_t r = strtoumax(nptr, end, base);
+	if (r > RET_MAX) {
+		r = RET_MAX;
+		errno = ERANGE;
+	}
+	return (uint_least8_t)r;
+}
+
+
+#else
+#include "test.h"
+
+int
+main(void)
+{
+	char *e;
+	errno = 0;
+	assert(strtou8("0xFF", NULL, 0) == UINT8_C(0xFF) && !errno);
+	assert(strtou8("0xFF", NULL, 16) == UINT8_C(0xFF) && !errno);
+	assert(strtou8("FF", NULL, 16) == UINT8_C(0xFF) && !errno);
+	assert(strtou8("0xFF", NULL, 10) == 0 && !errno);
+	assert(strtou8("0xFF", &e, 0) == UINT8_C(0xFF) && !*e && !errno);
+	assert(strtou8("0xFF ", &e, 16) == UINT8_C(0xFF) && *e == ' ' && !errno);
+	assert(strtou8("0xFF", &e, 10) == 0 && *e == 'x' && !errno);
+	assert(strtou8("255", &e, 10) == UINT8_C(0xFF) && !*e && !errno);
+	assert(strtou8("12", &e, 10) == 12 && !*e && !errno);
+	assert(strtou8("12", &e, 8) == 012 && !*e && !errno);
+	assert(strtou8("012", &e, 0) == 012 && !*e && !errno);
+	assert(strtou8("256", &e, 10) == UINT8_C(255) && !*e && errno == ERANGE);
+	errno = 0;
+	assert(!strtou8("1", &e, -10000) && errno == EINVAL);
+	errno = 0;
+	return 0;
+}
+
+#endif