1 files changed, 34 insertions, 0 deletions
diff --git a/libc-top-half/musl/src/string/memccpy.c b/libc-top-half/musl/src/string/memccpy.c
new file mode 100644
index 0000000..3b0a370
--- /dev/null
+++ b/libc-top-half/musl/src/string/memccpy.c
@@ -0,0 +1,34 @@
+#include <string.h>
+#include <stdint.h>
+#include <limits.h>
+
+#define ALIGN (sizeof(size_t)-1)
+#define ONES ((size_t)-1/UCHAR_MAX)
+#define HIGHS (ONES * (UCHAR_MAX/2+1))
+#define HASZERO(x) ((x)-ONES & ~(x) & HIGHS)
+
+void *memccpy(void *restrict dest, const void *restrict src, int c, size_t n)
+{
+	unsigned char *d = dest;
+	const unsigned char *s = src;
+
+	c = (unsigned char)c;
+#ifdef __GNUC__
+	typedef size_t __attribute__((__may_alias__)) word;
+	word *wd;
+	const word *ws;
+	if (((uintptr_t)s & ALIGN) == ((uintptr_t)d & ALIGN)) {
+		for (; ((uintptr_t)s & ALIGN) && n && (*d=*s)!=c; n--, s++, d++);
+		if ((uintptr_t)s & ALIGN) goto tail;
+		size_t k = ONES * c;
+		wd=(void *)d; ws=(const void *)s;
+		for (; n>=sizeof(size_t) && !HASZERO(*ws^k);
+		       n-=sizeof(size_t), ws++, wd++) *wd = *ws;
+		d=(void *)wd; s=(const void *)ws;
+	}
+#endif
+	for (; n && (*d=*s)!=c; n--, s++, d++);
+tail:
+	if (n) return d+1;
+	return 0;
+}