added tests as prepared by oliver

test/val/atoi-test.c

@@ -0,0 +1,42 @@
+/*
+  !!DESCRIPTION!! A small test for atoi. Assumes twos complement
+  !!ORIGIN!!
+  !!LICENCE!!
+  !!AUTHOR!!
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <limits.h>
+#include <errno.h>
+
+static unsigned int Failures = 0;
+
+static void CheckAtoi (const char* Str, int Val)
+{
+    int Res = atoi (Str);
+    if (Res != Val) {
+        printf ("atoi error in \"%s\":\n"
+                "  result = %d, should be %d\n", Str, Res, Val);
+        ++Failures;
+    }
+}
+
+int main (void)
+{
+    CheckAtoi ("\t +0A", 0);
+    CheckAtoi ("\t -0.123", 0);
+    CheckAtoi ("  -32  ", -32);
+    CheckAtoi (" +32  ", 32);
+    CheckAtoi ("0377", 377);
+    CheckAtoi (" 0377 ", 377);
+    CheckAtoi (" +0377 ", 377);
+    CheckAtoi (" -0377 ", -377);
+    CheckAtoi ("0x7FFF", 0);
+    CheckAtoi (" +0x7FFF", 0);
+    CheckAtoi (" -0x7FFF", 0);
+    printf ("Failures: %u\n", Failures);
+
+    return Failures;
+}