1 files changed, 54 insertions, 0 deletions
diff --git a/strtoi8.c b/strtoi8.c
new file mode 100644
index 0000000..01f783a
--- /dev/null
+++ b/strtoi8.c
@@ -0,0 +1,54 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+#ifndef TEST
+
+#define RET_MAX 127LL
+#define RET_MIN (-RET_MAX - 1LL)
+
+
+int_least8_t
+libsimple_strtoi8(const char *restrict nptr, char **restrict end, int base)
+{
+	intmax_t r = strtoimax(nptr, end, base);
+	if (r < RET_MIN) {
+		r = RET_MIN;
+		errno = ERANGE;
+	} else if (r > RET_MAX) {
+		r = RET_MAX;
+		errno = ERANGE;
+	}
+	return (int_least8_t)r;
+}
+
+
+#else
+#include "test.h"
+
+int
+main(void)
+{
+	char *e;
+	errno = 0;
+	assert(strtoi8("0x7F", NULL, 0) == INT8_C(0x7F) && !errno);
+	assert(strtoi8("0x7F", NULL, 16) == INT8_C(0x7F) && !errno);
+	assert(strtoi8("7F", NULL, 16) == INT8_C(0x7F) && !errno);
+	assert(strtoi8("0x7F", NULL, 10) == 0 && !errno);
+	assert(strtoi8("0x7F", &e, 0) == INT8_C(0x7F) && !*e && !errno);
+	assert(strtoi8("0x7F ", &e, 16) == INT8_C(0x7F) && *e == ' ' && !errno);
+	assert(strtoi8("0x7F", &e, 10) == 0 && *e == 'x' && !errno);
+	assert(strtoi8("127", &e, 10) == INT8_C(0x7F) && !*e && !errno);
+	assert(strtoi8("-127", &e, 10) == INT8_C(-127) && !*e && !errno);
+	assert(strtoi8("-128", &e, 10) == INT8_C(-128) && !*e && !errno);
+	assert(strtoi8("12", &e, 10) == 12 && !*e && !errno);
+	assert(strtoi8("12", &e, 8) == 012 && !*e && !errno);
+	assert(strtoi8("012", &e, 0) == 012 && !*e && !errno);
+	assert(strtoi8("128", &e, 10) == INT8_C(127) && !*e && errno == ERANGE);
+	errno = 0;
+	assert(strtoi8("-129", &e, 10) == INT8_C(-128) && !*e && errno == ERANGE);
+	errno = 0;
+	assert(!strtoi8("1", &e, -10000) && errno == EINVAL);
+	errno = 0;
+	return 0;
+}
+
+#endif