From 4546c75d685475d8b9f215b588364e1d1bbd0b79 Mon Sep 17 00:00:00 2001
From: Marvin Borner
Date: Wed, 29 Apr 2020 19:21:29 +0200
Subject: MUCH work in libc

Also cleaned up some syscalls etc
---
 src/userspace/libc/stdlib/atoi.c | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)
 create mode 100644 src/userspace/libc/stdlib/atoi.c

(limited to 'src/userspace/libc/stdlib/atoi.c')

diff --git a/src/userspace/libc/stdlib/atoi.c b/src/userspace/libc/stdlib/atoi.c
new file mode 100644
index 0000000..21b6c25
--- /dev/null
+++ b/src/userspace/libc/stdlib/atoi.c
@@ -0,0 +1,28 @@
+#include <stddef.h>
+#include <stdint.h>
+#include <string.h>
+#include <math.h>
+
+int atoi(char *str)
+{
+	u8 s_str = strlen(str);
+	if (!s_str)
+		return 0;
+
+	u8 negative = 0;
+	if (str[0] == '-')
+		negative = 1;
+
+	u8 i = 0;
+	if (negative)
+		i++;
+
+	int ret = 0;
+	for (; i < s_str; i++) {
+		ret += (str[i] - '0') * pow(10, (int)((s_str - i) - 1));
+	}
+
+	if (negative)
+		ret *= -1;
+	return ret;
+}
\ No newline at end of file
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