1 files changed, 53 insertions, 0 deletions
diff --git a/src/passwd/getgr_r.c b/src/passwd/getgr_r.c
new file mode 100644
index 00000000..5b1333e3
--- /dev/null
+++ b/src/passwd/getgr_r.c
@@ -0,0 +1,53 @@
+#include "pwf.h"
+
+#define FIX(x) (gr->gr_##x = gr->gr_##x-line+buf)
+
+static int getgr_r(const char *name, gid_t gid, struct group *gr, char *buf, size_t size, struct group **res)
+{
+	FILE *f;
+	char *line = 0;
+	size_t len = 0;
+	char **mem = 0;
+	size_t nmem = 0;
+	int rv = 0;
+	size_t i;
+
+	f = fopen("/etc/group", "rb");
+	if (!f) return errno;
+
+	*res = 0;
+	while (__getgrent_a(f, gr, &line, &len, &mem, &nmem)) {
+		if (name && !strcmp(name, gr->gr_name)
+		|| !name && gr->gr_gid == gid) {
+			if (size < len + nmem*sizeof(char *) + 32) {
+				rv = ERANGE;
+				break;
+			}
+			*res = gr;
+			buf += (16-(uintptr_t)buf)%16;
+			gr->gr_mem = (void *)buf;
+			buf += nmem*sizeof(char *);
+			memcpy(buf, line, len);
+			FIX(name);
+			FIX(passwd);
+			for (i=0; mem[i]; i++)
+				gr->gr_mem[i] = mem[i]-line+buf;
+			gr->gr_mem[i] = 0;
+			break;
+		}
+	}
+ 	free(mem);
+ 	free(line);
+	fclose(f);
+	return rv;
+}
+
+int getgrnam_r(const char *name, struct group *gr, char *buf, size_t size, struct group **res)
+{
+	return getgr_r(name, 0, gr, buf, size, res);
+}
+
+int getgruid_r(gid_t gid, struct group *gr, char *buf, size_t size, struct group **res)
+{
+	return getgr_r(0, gid, gr, buf, size, res);
+}