wm: teppich

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add atoi2

--- a/include/libc.h

+++ b/include/libc.h

@@ -15,6 +15,7 @@

 char* strncpy(char *dst, const char *src, size_t num);

 char* strncat(char *s1, char *s2, long n);

 char* strdup(char *s);

+char* strchar(char *s, char c);

 /* mem */

 void* memset(void* src, char c, unsigned int len);

--- /dev/null

+++ b/libc/atoi.c

@@ -1,0 +1,14 @@

+#include <u.h>

+#include <libc.h>

+

+/* doesn't handle - */

+int

+atoi(char *s)

+{

+	int n = 0;

+	while(*s > '9' || *s < '0')

+	{

+		n += *s - '0';

+	}

+	return n;

+}