1 files changed, 33 insertions, 0 deletions
diff --git a/libiberty/memrchr.c b/libiberty/memrchr.c
new file mode 100644
index 0000000..fe7713e
--- /dev/null
+++ b/libiberty/memrchr.c
@@ -0,0 +1,33 @@
+/*
+
+@deftypefn Supplemental void* memrchr (const void *@var{s}, int @var{c}, @
+  size_t @var{n})
+
+This function searches memory for the character @var{c} in reverse order,
+starting at @code{*@var{s}+@var{n}-1} .  The search only ends with
+the first occurrence of @var{c}, or when the start us reached; in particular,
+a null character does not terminate the search.  If the character @var{c} is
+found within @var{length} characters of @code{*@var{s}}, a pointer
+to the character is returned.  If @var{c} is not found, then @code{NULL} is
+returned.
+
+@end deftypefn
+
+*/
+
+#include <ansidecl.h>
+#include <stddef.h>
+
+void *
+memrchr (const void *src_void, int c, size_t length)
+{
+  if (length == 0)
+    return NULL;
+
+  const unsigned char *p = (const unsigned char*)src_void;
+  p += length;
+  while (*--p != (unsigned char)c)
+    if (src_void == p)
+      return NULL;
+  return (void *)p;
+}