Fixed commands and added some more

1 files changed, 27 insertions, 0 deletions

diff --git a/src/lib/string.c b/src/lib/string.c
new file mode 100644
index 0000000..6ef0316
--- /dev/null
+++ b/src/lib/string.c
@@ -0,0 +1,27 @@
+#include <stddef.h>
+
+size_t strlen(const char *str) {
+    size_t len = 0;
+    while (str[len])
+        len++;
+    return len;
+}
+
+size_t strcmp(const char *s1, const char *s2) {
+    while (*s1 && (*s1 == *s2)) {
+        s1++;
+        s2++;
+    }
+    return *(const unsigned char *) s1 - *(const unsigned char *) s2;
+}
+
+char *strcat(char *dst, const char *src) {
+    unsigned int i = 0;
+    unsigned int j = 0;
+    for (i = 0; dst[i] != 0; i++) {}
+    for (j = 0; src[j] != 0; j++) {
+        dst[i + j] = src[j];
+    }
+    dst[i + j] = 0;
+    return dst;
+}