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/*

 *  POSIX 1003.1b - 9.2.1 - Group Database Access Routines

 *

 *  The license and distribution terms for this file may be

 *  found in the file LICENSE in this distribution or at

 *  http://www.OARcorp.com/rtems/license.html.

 *

 *  $Id: getgrent.c,v 1.2 2001-09-27 12:01:15 chris Exp $

 */

#include <stdio.h>

#include <sys/types.h>

#include <grp.h>

#include <errno.h>

#include <unistd.h>

#include <stdlib.h>

#include <string.h>

#include <limits.h>

static struct group gr_group;    /* password structure */

static FILE *group_fp;

/*

 *  The size of these buffers is arbitrary and there is no provision

 *  to protect any of them from overflowing.  The scanf patterns

 *  need to be changed to prevent overflowing.  In addition,

 *  the limits on these needs to be examined.

 */

static char groupname[8];

static char password[1024];

static char groups[1024];

static char *gr_mem[16] = { } ;

extern void init_etc_passwd_group(void);

int getgrnam_r(

  const char     *name,

  struct group   *grp,

  char           *buffer,

  size_t          bufsize,

  struct group  **result

)

{

  FILE *fp;

  init_etc_passwd_group();

  if ((fp = fopen ("/etc/group", "r")) == NULL) {

    errno = EINVAL;

    return -1;

  }

  while (fgets (buffer, bufsize, fp)) {

    sscanf (buffer, "%[^:]:%[^:]:%d:%s\n",

      groupname, password, (int *) &grp->gr_gid,

      groups);

    grp->gr_name = groupname;

    grp->gr_passwd = password;

    grp->gr_mem = gr_mem ;

    if (!strcmp (groupname, name)) {

      fclose (fp);

      *result = grp;

      return 0;

    }

  }

  fclose (fp);

  errno = EINVAL;

  return -1;

}

struct group *getgrnam(

  const char *name

)

{

  char   buf[1024];

  struct group *g;

  if ( getgrnam_r( name, &gr_group, buf, 1024, &g ) )

    return NULL;

  return g;

}

int getgrgid_r(

  gid_t           gid,

  struct group   *grp,

  char           *buffer,

  size_t          bufsize,

  struct group  **result

)

{

  FILE *fp;

  init_etc_passwd_group();

  if ((fp = fopen ("/etc/group", "r")) == NULL) {

    errno = EINVAL;

    return -1;

  }

  while (fgets (buffer, bufsize, fp)) {

    sscanf (buffer, "%[^:]:%[^:]:%d:%s\n",

      groupname, password, (int *) &gr_group.gr_gid,

      groups);

    gr_group.gr_name = groupname;

    gr_group.gr_passwd = password;

    gr_group.gr_mem = gr_mem ;

    if (gid == gr_group.gr_gid) {

      fclose (fp);

      *result = grp;

      return 0;

    }

  }

  fclose (fp);

  errno = EINVAL;

  return -1;

}

struct group *getgrgid (

  gid_t gid

)

{

  char   buf[1024];

  struct group *g;

  if ( getgrgid_r( gid, &gr_group, buf, 1024, &g ) )

    return NULL;

  return g;

}

struct group *getgrent( void )

{

  char buf[1024];

  if (group_fp == NULL)

    return NULL;

  if (fgets (buf, sizeof (buf), group_fp) == NULL)

    return NULL;

  sscanf (buf, "%[^:]:%[^:]:%d:%s\n",

    groupname, password, (int *) &gr_group.gr_gid,

    groups);

  gr_group.gr_name = groupname;

  gr_group.gr_passwd = password;

  gr_group.gr_mem = gr_mem ;

  return &gr_group;

}

void

setgrent ()

{

  init_etc_passwd_group();

  if (group_fp != NULL)

    fclose (group_fp);

  group_fp = fopen ("/etc/group", "r");

}

void

endgrent ()

{

  if (group_fp != NULL)

    fclose (group_fp);

}