nsz Git - musl/blob - src/passwd/getpw_r.c

   1 #include "pwf.h"
   2 #include <pthread.h>
   3
   4 #define FIX(x) (pw->pw_##x = pw->pw_##x-line+buf)
   5
   6 static int getpw_r(const char *name, uid_t uid, struct passwd *pw, char *buf, size_t size, struct passwd **res)
   7 {
   8         FILE *f;
   9         char *line = 0;
  10         size_t len = 0;
  11         int rv = 0;
  12         int cs;
  13
  14         pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
  15
  16         f = fopen("/etc/passwd", "rb");
  17         if (!f) {
  18                 rv = errno;
  19                 goto done;
  20         }
  21
  22         *res = 0;
  23         while (__getpwent_a(f, pw, &line, &len)) {
  24                 if (name && !strcmp(name, pw->pw_name)
  25                 || !name && pw->pw_uid == uid) {
  26                         if (size < len) {
  27                                 rv = ERANGE;
  28                                 break;
  29                         }
  30                         *res = pw;
  31                         memcpy(buf, line, len);
  32                         FIX(name);
  33                         FIX(passwd);
  34                         FIX(gecos);
  35                         FIX(dir);
  36                         FIX(shell);
  37                         break;
  38                 }
  39         }
  40         free(line);
  41         fclose(f);
  42 done:
  43         pthread_setcancelstate(cs, 0);
  44         return rv;
  45 }
  46
  47 int getpwnam_r(const char *name, struct passwd *pw, char *buf, size_t size, struct passwd **res)
  48 {
  49         return getpw_r(name, 0, pw, buf, size, res);
  50 }
  51
  52 int getpwuid_r(uid_t uid, struct passwd *pw, char *buf, size_t size, struct passwd **res)
  53 {
  54         return getpw_r(0, uid, pw, buf, size, res);
  55 }