simple error check

1 files changed, 10 insertions, 1 deletions

diff --git a/util.h b/util.h
index 072f65e..1477d3b 100644
--- a/util.h
+++ b/util.h
@@ -19,6 +19,7 @@ namespace ov4 {
 
 void atomic_print(char *s);
 void atomic_print(int x);
+bool isnum(char *s);
 void reverse(char str[], int length);
 char* itoa(int num, char* str, int base);
 
@@ -27,7 +28,7 @@ bool DEBUG = true; // verbose mode, can be enabled on demand using something lik
 struct LogVoidify { void operator&(std::ostream&) const {} };
 
 const int DECIMAL = 10;
-const int LENGTH = 20;
+const int LENGTH = 25;
 
 void atomic_print(char *s)
 {
@@ -54,6 +55,14 @@ void reverse(char str[], int length)
     }
 }
 
+bool isnum(char *s)
+{
+    for (int i = 0; s[i] != 0; i++)
+        if (!isdigit(s[i]))
+            return false;
+    return true;
+}
+
 
 char* itoa(int num, char* str, int base)
 {