1 files changed, 80 insertions, 0 deletions
diff --git a/src/user/lib/std/string.c b/src/user/lib/std/string.c
new file mode 100644
index 0000000..20fd9e8
--- /dev/null
+++ b/src/user/lib/std/string.c
@@ -0,0 +1,80 @@
+#include <string.h>
+
+int strlen(const char *str) {
+	int i = 0;
+	while (str[i++]);
+	return i;
+}
+
+char *strchr(const char *str, char c) {
+	while (*str) {
+		if (*str == c) return (char*)str;
+		str++;
+	}
+	return NULL;
+}
+
+char *strcpy(char *dest, const char *src) {
+	memcpy(dest, src, strlen(src) + 1);
+	return (char*)src;
+}
+
+char *strdup(const char *src) {
+	char* ret = (char*)malloc(strlen(src) + 1);
+	if (ret == NULL) return ret;
+	strcpy(ret, src);
+	return ret;
+}
+
+char *strcat(char *dest, const char *src) {
+	char *dest2 = dest;
+	dest2 += strlen(dest) - 1;
+	while (*src) {
+		*dest2 = *src;
+		src++;
+		dest2++;
+	}
+	*dest2 = 0;
+	return dest;
+}
+
+int strcmp(const char *s1, const char *s2) {
+	while ((*s1) && (*s1 == *s2)) {
+		s1++;
+		s2++;
+	}
+	return (* (unsigned char*)s1 - *(unsigned char*)s2);
+}
+
+void *memcpy(void *vd, const void *vs, int count) {
+	uint8_t *dest = (uint8_t*)vd, *src = (uint8_t*)vs;
+	int f = count % 4, n = count / 4, i;
+	const uint32_t* s = (uint32_t*)src;
+	uint32_t* d = (uint32_t*)dest;
+	for (i = 0; i < n; i++) {
+		d[i] = s[i];
+	}
+	if (f != 0) {
+		for (i = count - f; i < count; i++) {
+			dest[i] = src[i];
+		}
+	}
+	return vd;
+}
+
+void *memset(void *dest, int val, int count) {
+	uint8_t *dest_c = (uint8_t*)dest;
+	int i;
+	for (i = 0; i < count; i++) {
+		dest_c[i] = val;
+	}
+	return dest;
+}
+
+uint16_t *memsetw(uint16_t *dest, uint16_t val, int count) {
+	int i;
+	for (i = 0; i < count; i++) {
+		dest[i] = val;
+	}
+	return dest;
+}