initial commit

src/convert.c

@@ -0,0 +1,54 @@
+#include "convert.h"
+#include "io.h"
+
+int stoi(const char* string)
+{
+    int output = 0;
+    int32_t sign = 1;
+    if(*string == '-')
+    {
+        string++;
+        sign = -1;
+    }
+
+
+    while(*string >= '0' && *string <= '9')
+    {
+        output *= 10;
+        output += sign * (*string++ - '0');
+    }
+
+    return output;
+}
+
+char* itoa(int number, char* string)
+{
+    volatile char* temp = (volatile char*)0x40000000;
+    int i = 0;
+    if(number == 0)
+    {
+        temp[i++] = '0';
+    }
+    else
+    {
+        for(int n = (number < 0 ? -number : number); n > 0; n /= 10)
+        {
+            temp[i++] = '0' + (n % 10);
+        }
+    }
+
+    if(number < 0)
+    {
+        temp[i++] = '-';
+    }
+
+    temp[i] = '\0';
+    string[i] = '\0';
+
+    while(*temp)
+    {
+        string[--i] = *temp++;
+    }
+
+    return string;
+}