1 files changed, 28 insertions, 0 deletions
diff --git a/src/libstddjb/prot_readgroups.c b/src/libstddjb/prot_readgroups.c
new file mode 100644
index 0000000..5559882
--- /dev/null
+++ b/src/libstddjb/prot_readgroups.c
@@ -0,0 +1,28 @@
+/* ISC license. */
+
+/* MT-unsafe */
+
+#include <sys/types.h>
+#include <grp.h>
+#include <errno.h>
+#include <skalibs/bytestr.h>
+#include <skalibs/djbunix.h>
+
+int prot_readgroups (char const *name, gid_t *tab, unsigned int max)
+{
+  unsigned int n = 0 ;
+  for (;;)
+  {
+    struct group *gr ;
+    register char **member ;
+    errno = 0 ;
+    if (n >= max) break ;
+    gr = getgrent() ;
+    if (!gr) break ;
+    for (member = gr->gr_mem ; *member ; member++)
+      if (!str_diff(name, *member)) break ;
+    if (*member) tab[n++] = gr->gr_gid ;
+  }
+  endgrent() ;
+  return errno ? -1 : (int)n ;
+}