Split str* and mem* into string.[ch]

[proxmark3-svn] / armsrc / string.c

diff --git a/armsrc/string.c b/armsrc/string.c
new file mode 100644 (file)
index 0000000..a3d3c04
--- /dev/null
+++ b/armsrc/string.c
@@ -0,0 +1,62 @@
+/* Implementations of the common string.h functions */
+#include "string.h"
+#include <stdint.h>
+
+void *memcpy(void *dest, const void *src, int len)
+{
+       uint8_t *d = dest;
+       const uint8_t *s = src;
+       while((len--) > 0) {
+               *d = *s;
+               d++;
+               s++;
+       }
+       return dest;
+}
+
+void *memset(void *dest, int c, int len)
+{
+       uint8_t *d = dest;
+       while((len--) > 0) {
+               *d = c;
+               d++;
+       }
+       return dest;
+}
+
+int memcmp(const void *av, const void *bv, int len)
+{
+       const uint8_t *a = av;
+       const uint8_t *b = bv;
+
+       while((len--) > 0) {
+               if(*a != *b) {
+                       return *a - *b;
+               }
+               a++;
+               b++;
+       }
+       return 0;
+}
+
+int strlen(const char *str)
+{
+       int l = 0;
+       while(*str) {
+               l++;
+               str++;
+       }
+       return l;
+}
+
+char* strncat(char *dest, const char *src, unsigned int n)
+{
+       unsigned int dest_len = strlen(dest);
+       unsigned int i;
+
+       for (i = 0 ; i < n && src[i] != '\0' ; i++)
+               dest[dest_len + i] = src[i];
+       dest[dest_len + i] = '\0';
+
+       return dest;
+}