some big renames into subdirs of aspects

updated README
removed size_t in sys/types.h and sys/types.h itself, size_t is in stddef.h

1 files changed, 48 insertions, 0 deletions

diff --git a/src/libc/stdlib.c b/src/libc/stdlib.c
new file mode 100644
index 0000000..46bdce8
--- /dev/null
+++ b/src/libc/stdlib.c
@@ -0,0 +1,48 @@
+#include <stdbool.h>
+#include "string.h"
+#include "stdlib.h"
+#include "stddef.h"
+
+static void strreverse( char *s )
+{
+	char *end = s + strlen( s ) - 1;
+	
+	while( s < end ) {
+		// XOR swap;
+		*s ^= *end;
+		*end ^= *s;
+		*s ^= *end;
+		s++;
+		end--;
+	}
+}
+    
+char *itoa( int v, char *s, int base )
+{
+	static char digit[] = "0123456789ABCDEF";
+	bool sign = false;
+	char *p = s;
+	
+	if( base < 2 || base > 16 ) {
+		return NULL;
+	}
+	
+	if( v < 0 ) {
+		v = -v;
+		sign = true;
+	} 
+	
+	do {
+		*p++ = digit[v % base];
+	} while( ( v /= base ) > 0 );
+
+	if( sign ) {
+		*p++ = '-';
+	}
+	*p = '\0';
+	
+	strreverse( s );
+	
+	return s;
+}
+