string: memcmp()

kernel-src/include/string.h

@@ -10,5 +10,6 @@ void *memcpy(void *dest, void *src, size_t size);
 void *memset(void *dest, unsigned long what, size_t size);
 int strcmp(const char *a, const char *b);
 int strncmp(const char *a, const char *b, size_t c);
+int memcmp(const void *a, const void *b, size_t s);
 
 #endif

kernel-src/lib/string.c

@@ -6,7 +6,7 @@ void *memcpy(void *d, void *s, size_t c) {
         uint8_t *sc = (uint8_t *)s;
         uint8_t *dc = (uint8_t *)d;
 
-        while(c--)
+        while (c--)
                 *dc++ = *sc++;
 
         return d;
@@ -14,7 +14,7 @@ void *memcpy(void *d, void *s, size_t c) {
 
 void *memset(void *ptr, unsigned long value, size_t num) {
         char *p = (char *)ptr;
-        while(num--)
+        while (num--)
                 *p++ = value;
 
         return ptr;
@@ -29,18 +29,18 @@ char *strcat(char *dest, const char *src) {
 	
 }
 int strcmp(const char *a, const char *b) {
-        while(*a && (*a == *b)) {
+        while (*a && (*a == *b)) {
 		++a;
 		++b;
 	}
 
-        return  *(const unsigned char *)a - *(const unsigned char *)b;
+        return *(const unsigned char *)a - *(const unsigned char *)b;
 }
 
 char *strcpy(char *p, const char *s) {
 	const char *temp1 = s;
 	char *temp2 = p;
-	while(*temp1 != '\0') {
+	while (*temp1 != '\0') {
 		*temp2 = *temp1;
 		temp1++;
 		temp2++;
@@ -52,7 +52,7 @@ char *strcpy(char *p, const char *s) {
 size_t strlen(const char *a) {
         size_t s = 0;
 
-        while(a[s] != '\0')
+        while (a[s] != '\0')
 		++s;
 
         return s;
@@ -61,8 +61,19 @@ size_t strlen(const char *a) {
 int strncmp(const char *a, const char *b, size_t c) {
         int diff = 0;
 
-        while(c-- && diff == 0)
+        while (c-- && diff == 0)
                 diff += *a++ - *b++;
 
         return diff;
 }
+
+int memcmp(const void *_a, const void *_b, size_t s) {
+	const uint8_t *a = _a;
+	const uint8_t *b = _b;
+	int diff = 0;
+
+	while (s-- && diff == 0)
+		diff += *a++ - *b++;
+
+	return diff;
+}