cleaner main, random nums, perfect script run

1 files changed, 74 insertions, 0 deletions

diff --git a/src/stdlib.c b/src/stdlib.c
index 3f11d57..303db4d 100644
--- a/src/stdlib.c
+++ b/src/stdlib.c
@@ -1,6 +1,80 @@
+#include <stdlib.h>
+
+#include <ctype.h>
+#include <stdarg.h>
+#include <stdint.h>
+#include <string.h>
+
+extern char *itoa(int, char *, int);
+
 void _exit(int code)
 {
 	(void)code;
 	for (;;);
 }
 
+char *snprintf(char *buf, unsigned int max, const char *format, ...)
+{
+	va_list args;
+	va_start(args, format);
+
+	if (buf == 0 || max == 0)
+		return 0;
+
+	static char nbuf[32];
+	unsigned int off = 0;
+	for (unsigned int i = 0; format[i] != '\0' && off < max; i++) {
+		if (format[i] == '%') {
+			i++;
+			nbuf[0] = '\0';
+			switch (format[i]) {
+			case 'd':
+				itoa(va_arg(args, int), nbuf, 10);
+				break;
+			case 'u':
+				itoa(va_arg(args, unsigned int), nbuf, 10);
+				break;
+			case 'x':
+			case 'p':
+				itoa(va_arg(args, unsigned int), nbuf, 16);
+				break;
+			case 'f':
+				itoa((int)va_arg(args, double), nbuf, 10);
+				break;
+			default:
+				buf[off++] = format[i];
+				nbuf[0] = '\0';
+				break;
+			}
+			if (nbuf[0] != '\0') {
+				for (unsigned int j = 0; off < max &&
+					nbuf[j] != '\0'; off++, j++)
+					buf[off] = nbuf[j];
+			}
+		} else {
+			buf[off++] = format[i];
+		}
+	}
+
+
+	buf[off >= max ? max - 1 : off] = '\0';
+	va_end(args);
+	return buf;
+}
+
+float strtof(const char *s, char **endptr)
+{
+	(void)s;
+	(void)endptr;
+	return 0.0f;
+}
+
+int atoi(const char *s)
+{
+	int n = 0;
+	for (unsigned int i = 0; isdigit(s[i]); i++) {
+		n *= 10;
+		n += s[i] - '0';
+	}
+	return n;
+}