Countless fixes and enhancements

[oswald.git] / ui / oswald_strings.c

diff --git a/ui/oswald_strings.c b/ui/oswald_strings.c
index e04da9b444d193eca9635058ceed1a4cf61d84de..1c621bcda9e023b44e809cbd68117b5baf4284cc 100644 (file)
--- a/ui/oswald_strings.c
+++ b/ui/oswald_strings.c
@@ -14,3 +14,35 @@ u16t oswald_strlen(u8t *string)
        return i;
 }
 
+char* itoa(s16t value, char* result, int base)
+{
+       char* ptr = result, *ptr1 = result, tmp_char;
+       s16t tmp_value;
+
+       if (result == NULL)
+               return NULL;
+
+       // check that the base if valid
+       if (base < 2 || base > 36) {
+               *result = '\0';
+               return result;
+       }
+
+       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;
+}
+