1 files changed, 46 insertions, 0 deletions
diff --git a/strtou16.c b/strtou16.c
new file mode 100644
index 0000000..33fbffa
--- /dev/null
+++ b/strtou16.c
@@ -0,0 +1,46 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+#ifndef TEST
+
+#define RET_MAX 65535ULL
+
+
+uint_least16_t
+libsimple_strtou16(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_least16_t)r;
+}
+
+
+#else
+#include "test.h"
+
+int
+main(void)
+{
+	char *e;
+	errno = 0;
+	assert(strtou16("0xFFFF", NULL, 0) == UINT16_C(0xFFFF) && !errno);
+	assert(strtou16("0xFFFF", NULL, 16) == UINT16_C(0xFFFF) && !errno);
+	assert(strtou16("FFFF", NULL, 16) == UINT16_C(0xFFFF) && !errno);
+	assert(strtou16("0xFFFF", NULL, 10) == 0 && !errno);
+	assert(strtou16("0xFFFF", &e, 0) == UINT16_C(0xFFFF) && !*e && !errno);
+	assert(strtou16("0xFFFF ", &e, 16) == UINT16_C(0xFFFF) && *e == ' ' && !errno);
+	assert(strtou16("0xFFFF", &e, 10) == 0 && *e == 'x' && !errno);
+	assert(strtou16("65535", &e, 10) == UINT16_C(0xFFFF) && !*e && !errno);
+	assert(strtou16("1234", &e, 10) == 1234 && !*e && !errno);
+	assert(strtou16("1234", &e, 8) == 01234 && !*e && !errno);
+	assert(strtou16("01234", &e, 0) == 01234 && !*e && !errno);
+	assert(strtou16("65536", &e, 10) == UINT16_C(65535) && !*e && errno == ERANGE);
+	errno = 0;
+	assert(!strtou16("1", &e, -10000) && errno == EINVAL);
+	errno = 0;
+	return 0;
+}
+
+#endif