initial commit. working on tasking

1 files changed, 50 insertions, 0 deletions

diff --git a/lib/string.c b/lib/string.c
new file mode 100644
index 0000000..28436d5
--- /dev/null
+++ b/lib/string.c
@@ -0,0 +1,50 @@
+#include "string.h"
+
+void *memset(void *s, int c, size_t n)
+{
+    for(size_t i = 0; i < n; i++) {
+        ((char*)s)[i] = c;
+    }
+    return s;
+}
+void *memcpy(void *a, const void *b, size_t n)
+{
+    for(size_t i = 0; i < n; i++) {
+        ((char*)a)[i] = ((const char*)b)[i];
+    }
+    return a;
+}
+
+int memcmp(const void *a, const void *b, size_t n)
+{
+    const char *ca = a;
+    const char *cb = b;
+    for(size_t i = 0; i < n; i++) {
+        if(ca[i] != cb[i]) return ca[i] - cb[i];
+    }
+    return 0;
+}
+
+size_t strlen(const char *s)
+{
+    size_t i = 0;
+    for(; s[i]; i++);
+    return i;
+}
+
+char c_toupper(char c) {
+    return (c > 0x60 && c < 0x7B) ? (c - 0x20) : c;
+}
+
+char *str_toupper(char *s, size_t n)
+{
+    for(size_t i = 0; i < n; i++) {
+        s[i] = c_toupper(s[i]);
+    }
+    return s;
+}
+
+int strncmp(const char *s1, const char *s2, size_t n)
+{
+    return memcmp(s1, s2, n);
+}