1 files changed, 83 insertions, 0 deletions
diff --git a/memreplaceelem.c b/memreplaceelem.c
new file mode 100644
index 0000000..1620d5c
--- /dev/null
+++ b/memreplaceelem.c
@@ -0,0 +1,83 @@
+/* See LICENSE file for copyright and license details. */
+#include "libsimple.h"
+#ifndef TEST
+
+
+void *
+libsimple_memreplaceelem(void *restrict s_, const void *old_, const void *new_, size_t n, size_t width) /* TODO test, man */
+{
+	switch (width) {
+	case 0:
+		return s_;
+	case 1:
+		{
+			uint8_t *restrict s = s_;
+			uint8_t old = *(const uint8_t *)old_;
+			uint8_t new = *(const uint8_t *)new_;
+			for (; n; s++, n--)
+				if (*s == old)
+					*s = new;
+			return s;
+		}
+	case 2:
+		{
+			uint16_t *restrict s = s_;
+			uint16_t old = *(const uint16_t *)old_;
+			uint16_t new = *(const uint16_t *)new_;
+			for (; n; s++, n--)
+				if (*s == old)
+					*s = new;
+			return s;
+		}
+	case 4:
+		{
+			uint32_t *restrict s = s_;
+			uint32_t old = *(const uint32_t *)old_;
+			uint32_t new = *(const uint32_t *)new_;
+			for (; n; s++, n--)
+				if (*s == old)
+					*s = new;
+			return s;
+		}
+	case 8:
+		{
+			uint64_t *restrict s = s_;
+			uint64_t old = *(const uint64_t *)old_;
+			uint64_t new = *(const uint64_t *)new_;
+			for (; n; s++, n--)
+				if (*s == old)
+					*s = new;
+			return s;
+		}
+	default:
+		{
+			char *restrict s = s_;
+			const char *old = old_;
+			const char *new = new_;
+			size_t i;
+			for (; n; s += width, n--) {
+				if (*s == *old) {
+					for (i = 0; i < width; i++)
+						if (s[i] != old[i])
+							goto next;
+					for (i = 0; i < width; i++)
+						s[i] = new[i];
+				}
+			next:;
+			}
+			return s;
+		}
+	}
+}
+
+
+#else
+#include "test.h"
+
+int
+main(void)
+{
+	return 0;
+}
+
+#endif