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-rw-r--r--memelemcpy.c94
1 files changed, 94 insertions, 0 deletions
diff --git a/memelemcpy.c b/memelemcpy.c
new file mode 100644
index 0000000..da32946
--- /dev/null
+++ b/memelemcpy.c
@@ -0,0 +1,94 @@
+/* See LICENSE file for copyright and license details. */
+#include "libsimple.h"
+#ifndef TEST
+
+
+static inline uint8_t *
+memelemcpy8(uint8_t *restrict d, const uint8_t *restrict s, uint8_t elem, size_t n)
+{
+ for (; n; s++, n--)
+ if ((*d++ = *s) == elem)
+ return d;
+ return NULL;
+}
+
+
+static inline uint16_t *
+memelemcpy16(uint16_t *restrict d, const uint16_t *restrict s, uint16_t elem, size_t n)
+{
+ for (; n; s++, n--)
+ if ((*d++ = *s) == elem)
+ return d;
+ return NULL;
+}
+
+
+static inline uint32_t *
+memelemcpy32(uint32_t *restrict d, const uint32_t *restrict s, uint32_t elem, size_t n)
+{
+ for (; n; s++, n--)
+ if ((*d++ = *s) == elem)
+ return d;
+ return NULL;
+}
+
+
+static inline uint64_t *
+memelemcpy64(uint64_t *restrict d, const uint64_t *restrict s, uint64_t elem, size_t n)
+{
+ for (; n; s++, n--)
+ if ((*d++ = *s) == elem)
+ return d;
+ return NULL;
+}
+
+
+static inline char *
+memelemcpyx(char *restrict d, const char *restrict s, const char *restrict elem, size_t size, size_t n)
+{
+ size_t i;
+ for (; n; s += size, n--) {
+ for (i = 0; i < size; i++)
+ d[i] = s[i];
+ for (i = 0; i < size; i++)
+ if (d[i] != elem[i])
+ goto next;
+ d += size;
+ return d;
+ next:
+ d += size;
+ }
+ return NULL;
+}
+
+
+void *
+libsimple_memelemcpy(void *restrict d, const void *restrict s, const void *restrict elem, size_t size, size_t n) /* TODO test, man */
+{
+ switch (size) {
+ case 0:
+ return d;
+ case 1:
+ return memelemcpy8(d, s, *(const uint8_t *)elem, n);
+ case 2:
+ return memelemcpy16(d, s, *(const uint16_t *)elem, n);
+ case 4:
+ return memelemcpy32(d, s, *(const uint32_t *)elem, n);
+ case 8:
+ return memelemcpy64(d, s, *(const uint64_t *)elem, n);
+ default:
+ return memelemcpyx(d, s, elem, size, n);
+ }
+}
+
+
+#else
+#include "test.h"
+
+int
+main(void)
+{
+ return 0;
+}
+
+#endif