1 files changed, 64 insertions, 0 deletions
diff --git a/src/string.c b/src/string.c
new file mode 100644
index 0000000..f1876f2
--- /dev/null
+++ b/src/string.c
@@ -0,0 +1,64 @@
+
+
+#include <stddef.h>
+#include <stdint.h>
+
+
+int memcmp(void *s1, const void *s2, size_t n)
+{
+	unsigned char *a = (unsigned char *) s1;
+	unsigned char *b = (unsigned char *) s2;
+	for (size_t i=0;i<n;i++)
+		if (a[i] != b[i]) return a[i] - b[i];
+	return 0;
+}
+
+void *memcpy(void *dest, const void *src, size_t n)
+{
+	unsigned char *d = (unsigned char *) dest;
+	unsigned char *s = (unsigned char *) src;
+	for (size_t i=0;i<n;i++) d[i] = s[i];
+	return dest;
+}
+
+void *memmove(void *dest, const void *src, size_t n)
+{
+	unsigned char *d = (unsigned char *) dest;
+	unsigned char *s = (unsigned char *) src;
+	if (d < s)
+		for (size_t i=0;i<n;i++)
+			d[i] = s[i];
+	else
+		for (size_t i=n;i!=0;i--)
+			d[i-1] = s[i-1];
+	return dest;
+}
+
+void *memset(void *s, int c, size_t n) 
+{
+	unsigned char *str = (unsigned char *) s;
+	for (size_t i=0;i<n;i++) str[i] = c;
+	return s;
+}
+
+size_t strlen(const char *s)
+{
+	size_t len = 0;
+	while (s[++len]); 
+	return len;
+}
+
+
+char *hex(uint32_t n, char *buf)
+{
+	buf[0] = '0'; buf[1] = 'x';
+	for (int i=0;i<8;i++)
+	{
+		int digit = (n >> (i * 4)) & 0xF;
+		if (digit < 10)
+			buf[9 - i] = '0' + digit;
+		else
+			buf[9 - i] = 'A' + (digit - 10);
+	}
+	return buf;
+}