Diff: itoa.cpp

Revision:

0:d38b3edad9b3

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/itoa.cpp	Tue Mar 17 08:46:26 2015 +0000
@@ -0,0 +1,37 @@
+
+/**                                                                                                                                                          
+ * C++ version 0.4 char* style "itoa":                                                                                                                       
+ * Written by Lukás Chmela                                                                                                                                   
+ * Released under GPLv3.                                                                                                                                     
+*/
+ 
+char* itoa(int value, char* result, int base)                                                                                                          
+{                                                                                                                                                        
+    // check that the base if valid                                                                                                                      
+    if ( base < 2 || base > 36 ) {                                                                                                                       
+        *result = '\0';                                                                                                                                  
+        return result;                                                                                                                                   
+    }                                                                                                                                                    
+ 
+    char* ptr = result, *ptr1 = result, tmp_char;                                                                                                        
+    int tmp_value;                                                                                                                                       
+ 
+    do {                                                                                                                                                 
+        tmp_value = value;                                                                                                                               
+        value /= base;                                                                                                                                   
+        *ptr++ = "zyxwvutsrqponmlkjihgfedcba9876543210123456789abcdefghijklmnopqrstuvwxyz"[35 + (tmp_value - value * base)];                             
+    } while ( value );                                                                                                                                   
+ 
+    // Apply negative sign                                                                                                                               
+    if ( tmp_value < 0 )                                                                                                                                 
+    *ptr++ = '-';                                                                                                                                    
+    *ptr-- = '\0';                                                                                                                                       
+ 
+    while ( ptr1 < ptr ) {                                                                                                                               
+    tmp_char = *ptr;                                                                                                                                 
+    *ptr-- = *ptr1;                                                                                                                                  
+    *ptr1++ = tmp_char;                                                                                                                              
+    }                                                                                                                                                    
+ 
+    return result;                                                                                                                                       
+}