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-rw-r--r--src/passwd/getgr_r.c53
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);
+}