summaryrefslogtreecommitdiff
path: root/src/string/stpcpy.c
diff options
context:
space:
mode:
authorRich Felker <dalias@aerifal.cx>2011-02-12 00:22:29 -0500
committerRich Felker <dalias@aerifal.cx>2011-02-12 00:22:29 -0500
commit0b44a0315b47dd8eced9f3b7f31580cf14bbfc01 (patch)
tree6eaef0d8a720fa3da580de87b647fff796fe80b3 /src/string/stpcpy.c
downloadmusl-0b44a0315b47dd8eced9f3b7f31580cf14bbfc01.tar.gz
initial check-in, version 0.5.0v0.5.0
Diffstat (limited to 'src/string/stpcpy.c')
-rw-r--r--src/string/stpcpy.c29
1 files changed, 29 insertions, 0 deletions
diff --git a/src/string/stpcpy.c b/src/string/stpcpy.c
new file mode 100644
index 00000000..10ca4933
--- /dev/null
+++ b/src/string/stpcpy.c
@@ -0,0 +1,29 @@
+#include <string.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <limits.h>
+#include "libc.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)
+
+char *__stpcpy(char *d, const char *s)
+{
+ size_t *wd;
+ const size_t *ws;
+
+ if (((uintptr_t)s & ALIGN) == ((uintptr_t)d & ALIGN)) {
+ for (; (*d=*s) && ((uintptr_t)s & ALIGN); s++, d++);
+ if (!*s) return d;
+ wd=(void *)d; ws=(const void *)s;
+ for (; !HASZERO(*ws); *wd++ = *ws++);
+ d=(void *)wd; s=(const void *)ws;
+ }
+ for (; (*d=*s); s++, d++);
+
+ return d;
+}
+
+weak_alias(__stpcpy, stpcpy);