getpw_r.c raw

   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  	char *line = 0;
   9  	size_t len = 0;
  10  	int rv = 0;
  11  	int cs;
  12  
  13  	pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
  14  
  15  	rv = __getpw_a(name, uid, pw, &line, &len, res);
  16  	if (*res && size < len) {
  17  		*res = 0;
  18  		rv = ERANGE;
  19  	}
  20  	if (*res) {
  21  		memcpy(buf, line, len);
  22  		FIX(name);
  23  		FIX(passwd);
  24  		FIX(gecos);
  25  		FIX(dir);
  26  		FIX(shell);
  27  	}
  28   	free(line);
  29  	pthread_setcancelstate(cs, 0);
  30  	if (rv) errno = rv;
  31  	return rv;
  32  }
  33  
  34  int getpwnam_r(const char *name, struct passwd *pw, char *buf, size_t size, struct passwd **res)
  35  {
  36  	return getpw_r(name, 0, pw, buf, size, res);
  37  }
  38  
  39  int getpwuid_r(uid_t uid, struct passwd *pw, char *buf, size_t size, struct passwd **res)
  40  {
  41  	return getpw_r(0, uid, pw, buf, size, res);
  42  }
  43