1 files changed, 48 insertions, 0 deletions
diff --git a/strtou64.c b/strtou64.c
new file mode 100644
index 0000000..a9ce787
--- /dev/null
+++ b/strtou64.c
@@ -0,0 +1,48 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+#ifndef TEST
+
+#define RET_MAX 18446744073709551615ULL
+
+
+uint_least64_t
+libsimple_strtou64(const char *restrict nptr, char **restrict end, int base)
+{
+	uintmax_t r = strtoumax(nptr, end, base);
+#if UINTMAX_MAX > RET_MAX
+	if (r > RET_MAX) {
+		r = RET_MAX;
+		errno = ERANGE;
+	}
+#endif
+	return (uint_least64_t)r;
+}
+
+
+#else
+#include "test.h"
+
+int
+main(void)
+{
+	char *e;
+	errno = 0;
+	assert(strtou64("0xFFFFFFFFFFFFFFFF", NULL, 0) == UINT64_C(0xFFFFFFFFFFFFFFFF) && !errno);
+	assert(strtou64("0xFFFFFFFFFFFFFFFF", NULL, 16) == UINT64_C(0xFFFFFFFFFFFFFFFF) && !errno);
+	assert(strtou64("FFFFFFFFFFFFFFFF", NULL, 16) == UINT64_C(0xFFFFFFFFFFFFFFFF) && !errno);
+	assert(strtou64("0xFFFFFFFFFFFFFFFF", NULL, 10) == 0 && !errno);
+	assert(strtou64("0xFFFFFFFFFFFFFFFF", &e, 0) == UINT64_C(0xFFFFFFFFFFFFFFFF) && !*e && !errno);
+	assert(strtou64("0xFFFFFFFFFFFFFFFF ", &e, 16) == UINT64_C(0xFFFFFFFFFFFFFFFF) && *e == ' ' && !errno);
+	assert(strtou64("0xFFFFFFFFFFFFFFFF", &e, 10) == 0 && *e == 'x' && !errno);
+	assert(strtou64("18446744073709551615", &e, 10) == UINT64_C(0xFFFFFFFFFFFFFFFF) && !*e && !errno);
+	assert(strtou64("1234", &e, 10) == 1234 && !*e && !errno);
+	assert(strtou64("1234", &e, 8) == 01234 && !*e && !errno);
+	assert(strtou64("01234", &e, 0) == 01234 && !*e && !errno);
+	assert(strtou64("18446744073709551616", &e, 10) == UINT64_C(18446744073709551615) && !*e && errno == ERANGE);
+	errno = 0;
+	assert(!strtou64("1", &e, -10000) && errno == EINVAL);
+	errno = 0;
+	return 0;
+}
+
+#endif