add fgetgrent function

based on patch by Isaac Dunham, moved to its own file to avoid
increasing bss on static linked programs not using this nonstandard
function but using the standard getgrent function, and vice versa.

2 files changed, 13 insertions, 0 deletions

diff --git a/include/grp.h b/include/grp.h
index 030d7f82..cb40e07e 100644
--- a/include/grp.h
+++ b/include/grp.h
@@ -30,6 +30,10 @@ struct group  *getgrent(void);
 void           endgrent(void);
 void           setgrent(void);
 
+#ifdef _GNU_SOURCE
+struct group  *fgetgrent(FILE *stream);
+#endif
+
 #if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
 int getgrouplist(const char *, gid_t, gid_t *, int *);
 int setgroups(size_t, const gid_t *);
diff --git a/src/passwd/fgetgrent.c b/src/passwd/fgetgrent.c
new file mode 100644
index 00000000..2f18d925
--- /dev/null
+++ b/src/passwd/fgetgrent.c
@@ -0,0 +1,9 @@
+#include "pwf.h"
+
+struct group *fgetgrent(FILE *f)
+{
+	static char *line, **mem;
+	static struct group gr;
+	size_t size=0, nmem=0;
+	return __getgrent_a(f, &gr, &line, &size, &mem, &nmem);
+}