create a simple CPIO parser for initrd's

1 files changed, 13 insertions, 0 deletions

diff --git a/include/common.h b/include/common.h
index 88ee8c4..d26b8ae 100644
--- a/include/common.h
+++ b/include/common.h
@@ -16,6 +16,19 @@ static inline int strcmp(const char *str1, const char* str2) {
     return *(const unsigned char *)str1 - *(const unsigned char *)str2;
 }
 
+static inline int memcmp(const void *s1, const void *s2, size_t n) {
+    const unsigned char *p1 = (const unsigned char *)s1;
+    const unsigned char *p2 = (const unsigned char *)s2;
+
+    for (size_t i = 0; i < n; i++) {
+        if (p1[i] != p2[i]) {
+            return p1[i] - p2[i];
+        }
+    }
+
+    return 0;
+}
+
 static inline void *memcpy(void *restrict dest, const void* restrict src, size_t size) {
     unsigned char *d = (unsigned char *)dest;
     unsigned char *s = (unsigned char *)src;