1 files changed, 54 insertions, 0 deletions
diff --git a/strtoi32.c b/strtoi32.c
new file mode 100644
index 0000000..4a768e8
--- /dev/null
+++ b/strtoi32.c
@@ -0,0 +1,54 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+#ifndef TEST
+
+#define RET_MAX 2147483647LL
+#define RET_MIN (-RET_MAX - 1LL)
+
+
+int_least32_t
+libsimple_strtoi32(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_least32_t)r;
+}
+
+
+#else
+#include "test.h"
+
+int
+main(void)
+{
+	char *e;
+	errno = 0;
+	assert(strtoi32("0x7FFFFFFF", NULL, 0) == INT32_C(0x7FFFFFFF) && !errno);
+	assert(strtoi32("0x7FFFFFFF", NULL, 16) == INT32_C(0x7FFFFFFF) && !errno);
+	assert(strtoi32("7FFFFFFF", NULL, 16) == INT32_C(0x7FFFFFFF) && !errno);
+	assert(strtoi32("0x7FFFFFFF", NULL, 10) == 0 && !errno);
+	assert(strtoi32("0x7FFFFFFF", &e, 0) == INT32_C(0x7FFFFFFF) && !*e && !errno);
+	assert(strtoi32("0x7FFFFFFF ", &e, 16) == INT32_C(0x7FFFFFFF) && *e == ' ' && !errno);
+	assert(strtoi32("0x7FFFFFFF", &e, 10) == 0 && *e == 'x' && !errno);
+	assert(strtoi32("2147483647", &e, 10) == INT32_C(0x7FFFFFFF) && !*e && !errno);
+	assert(strtoi32("-2147483647", &e, 10) == INT32_C(-2147483647) && !*e && !errno);
+	assert(strtoi32("-2147483648", &e, 10) == INT32_C(-2147483648) && !*e && !errno);
+	assert(strtoi32("1234", &e, 10) == 1234 && !*e && !errno);
+	assert(strtoi32("1234", &e, 8) == 01234 && !*e && !errno);
+	assert(strtoi32("01234", &e, 0) == 01234 && !*e && !errno);
+	assert(strtoi32("2147483648", &e, 10) == INT32_C(2147483647) && !*e && errno == ERANGE);
+	errno = 0;
+	assert(strtoi32("-2147483649", &e, 10) == INT32_C(-2147483648) && !*e && errno == ERANGE);
+	errno = 0;
+	assert(!strtoi32("1", &e, -10000) && errno == EINVAL);
+	errno = 0;
+	return 0;
+}
+
+#endif