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-rw-r--r--src/stdlib/strtoimax.c25
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;
+}