1 files changed, 27 insertions, 0 deletions
diff --git a/src/libnsss/nsss_grp_copy.c b/src/libnsss/nsss_grp_copy.c
new file mode 100644
index 0000000..684996e
--- /dev/null
+++ b/src/libnsss/nsss_grp_copy.c
@@ -0,0 +1,27 @@
+/* ISC license. */
+
+#include <stdint.h>
+#include <string.h>
+#include <errno.h>
+#include "nsss-internal.h"
+
+int nsss_grp_copy (struct group *gr, char *buf, size_t buflen, struct group const *gr2, char const *s, size_t len, char *const *p, size_t n)
+{
+  char **q ;
+  size_t offset = (uintptr_t)buf % 16 ;
+  offset = offset ? 16 - offset : 0 ;
+  if (buflen < offset) return (errno = ERANGE, 0) ;
+  buf += offset ; buflen -= offset ;
+  offset = (n+1) * sizeof(char *) ;
+  if (buflen < offset || buflen - offset < len) return (errno = ERANGE, 0) ;
+  q = (char **)buf ;
+  gr->gr_mem = q ;
+  buf += offset ;
+  memcpy(buf, s, len) ;
+  for (size_t i = 0 ; i < n ; i++) q[i] = buf + (p[i] - s) ;
+  q[n] = 0 ;
+  gr->gr_name = buf + (gr2->gr_name - s) ;
+  gr->gr_passwd = buf + (gr2->gr_passwd - s) ;
+  gr->gr_gid = gr2->gr_gid ;
+  return 1 ;
+}