1 files changed, 25 insertions, 0 deletions
diff --git a/src/stdlib/strtoimax.c b/src/stdlib/strtoimax.c
new file mode 100644
index 00000000..19691091
--- /dev/null
+++ b/src/stdlib/strtoimax.c
@@ -0,0 +1,25 @@
+#include <inttypes.h>
+#include <errno.h>
+#include <ctype.h>
+
+intmax_t strtoimax(const char *s1, char **p, int base)
+{
+	const unsigned char *s = s1;
+	int sign = 0;
+	uintmax_t x;
+
+	/* Initial whitespace */
+	for (; isspace(*s); s++);
+
+	/* Optional sign */
+	if (*s == '-') sign = *s++;
+	else if (*s == '+') s++;
+
+	x = strtoumax(s, p, base);
+	if (x > INTMAX_MAX) {
+		if (!sign || -x != INTMAX_MIN)
+			errno = ERANGE;
+		return sign ? INTMAX_MIN : INTMAX_MAX;
+	}
+	return sign ? -x : x;
+}