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#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 getgrgid_r(gid_t gid, struct group *gr, char *buf, size_t size, struct group **res)
{
return getgr_r(0, gid, gr, buf, size, res);
}
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