initial commit <3

strtoui.h

@@ -0,0 +1,31 @@
+#ifndef STRTOUI_H
+#define STRTOUI_H
+
+#include "stdlib.h"
+#include "ctype.h"
+#include "limits.h"
+#include "errno.h"
+
+enum strtoui_error{
+    STRTOUI_SUCCESS,
+    STRTOUI_OVERFLOW,
+    STRTOUI_UNDERFLOW,
+    STRTOUI_INCONVERTIBLE
+};
+
+enum strtoui_error strtoui(unsigned int *out, char *s, int base) {
+    char *end;
+    if(s[0] == '\0' || isspace(s[0]))
+        return STRTOUI_INCONVERTIBLE;
+    long l =  strtol(s, &end, base);
+    if(l > INT_MAX || (errno == ERANGE && l == LONG_MAX))
+        return STRTOUI_OVERFLOW;
+    if(l < 0|| (errno == ERANGE && l == LONG_MIN))
+        return STRTOUI_UNDERFLOW;
+    if(*end != '\0')
+        return STRTOUI_INCONVERTIBLE;
+    *out = l;
+    return STRTOUI_SUCCESS;
+}
+
+#endif