From a3469d648a4d0f276d979ceb14b8716b46f4f72e Mon Sep 17 00:00:00 2001
From: dzwdz
Date: Wed, 6 Oct 2021 06:28:04 +0000
Subject: init: printf base

---
 src/init/stdlib.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

(limited to 'src/init/stdlib.c')

diff --git a/src/init/stdlib.c b/src/init/stdlib.c
index 6ed5a0a..ac80c28 100644
--- a/src/init/stdlib.c
+++ b/src/init/stdlib.c
@@ -1,4 +1,6 @@
 #include <init/stdlib.h>
+#include <shared/syscalls.h>
+#include <stdarg.h>
 
 int memcmp(const void *s1, const void *s2, size_t n) {
 	const unsigned char *c1 = s1, *c2 = s2;
@@ -10,3 +12,19 @@ int memcmp(const void *s1, const void *s2, size_t n) {
 	}
 	return 0;
 }
+
+int printf(const char *fmt, ...) {
+	const char *seg = fmt; // beginning of the current segment
+	int total = 0;
+	va_list argp;
+	va_start(argp, fmt);
+	for (;;) {
+		char c = *fmt++;
+		switch (c) {
+			case '\0':
+				// TODO don't assume that stdout is @ fd 0
+				_syscall_write(0, seg, fmt - seg, 0);
+				return total + (fmt - seg);
+		}
+	}
+}
-- 
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