1#include "pwf.h"
 2#include <pthread.h>
 3
 4#define FIX(x) (gr->gr_##x = gr->gr_##x-line+buf)
 5
 6static int getgr_r(const char *name, gid_t gid, struct group *gr, char *buf, size_t size, struct group **res)
 7{
 8	char *line = 0;
 9	size_t len = 0;
10	char **mem = 0;
11	size_t nmem = 0;
12	int rv = 0;
13	size_t i;
14	int cs;
15
16	pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
17
18	rv = __getgr_a(name, gid, gr, &line, &len, &mem, &nmem, res);
19	if (*res && size < len + (nmem+1)*sizeof(char *) + 32) {
20		*res = 0;
21		rv = ERANGE;
22	}
23	if (*res) {
24		buf += (16-(uintptr_t)buf)%16;
25		gr->gr_mem = (void *)buf;
26		buf += (nmem+1)*sizeof(char *);
27		memcpy(buf, line, len);
28		FIX(name);
29		FIX(passwd);
30		for (i=0; mem[i]; i++)
31			gr->gr_mem[i] = mem[i]-line+buf;
32		gr->gr_mem[i] = 0;
33	}
34 	free(mem);
35 	free(line);
36	pthread_setcancelstate(cs, 0);
37	if (rv) errno = rv;
38	return rv;
39}
40
41int getgrnam_r(const char *name, struct group *gr, char *buf, size_t size, struct group **res)
42{
43	return getgr_r(name, 0, gr, buf, size, res);
44}
45
46int getgrgid_r(gid_t gid, struct group *gr, char *buf, size_t size, struct group **res)
47{
48	return getgr_r(0, gid, gr, buf, size, res);
49}