/*      $NetBSD: getgrent_r.c,v 1.1.1.2 2012/09/09 16:07:51 christos Exp $      */

/*
* Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
* Copyright (c) 1998-1999 by Internet Software Consortium.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
* OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/

#if defined(LIBC_SCCS) && !defined(lint)
static const char rcsid[] = "Id: getgrent_r.c,v 1.7 2005/04/27 04:56:24 sra Exp ";
#endif /* LIBC_SCCS and not lint */

#include <port_before.h>
#if !defined(_REENTRANT) || !defined(DO_PTHREADS) || !defined(WANT_IRS_PW)
       static int getgrent_r_not_required = 0;
#else
#include <errno.h>
#include <string.h>
#include <stdio.h>
#include <sys/types.h>
#if (defined(POSIX_GETGRNAM_R) || defined(POSIX_GETGRGID_R)) && \
   defined(_POSIX_PTHREAD_SEMANTICS)
       /* turn off solaris remapping in <grp.h> */
#define _UNIX95
#undef _POSIX_PTHREAD_SEMANTICS
#include <grp.h>
#define _POSIX_PTHREAD_SEMANTICS 1
#else
#include <grp.h>
#endif
#include <sys/param.h>
#include <port_after.h>

#ifdef GROUP_R_RETURN

static int
copy_group(struct group *, struct group *, char *buf, int buflen);

/* POSIX 1003.1c */
#ifdef POSIX_GETGRNAM_R
int
__posix_getgrnam_r(const char *name,  struct group *gptr,
               char *buf, int buflen, struct group **result) {
#else
int
getgrnam_r(const char *name,  struct group *gptr,
               char *buf, size_t buflen, struct group **result) {
#endif
       struct group *ge = getgrnam(name);
       int res;

       if (ge == NULL) {
               *result = NULL;
               return (0);
       }

       res = copy_group(ge, gptr, buf, buflen);
       *result = res ? NULL : gptr;
       return (res);
}

#ifdef POSIX_GETGRNAM_R
struct group *
getgrnam_r(const char *name,  struct group *gptr,
               char *buf, int buflen) {
       struct group *ge = getgrnam(name);
       int res;

       if (ge == NULL)
               return (NULL);
       res = copy_group(ge, gptr, buf, buflen);
       return (res ? NULL : gptr);
}
#endif /* POSIX_GETGRNAM_R */

/* POSIX 1003.1c */
#ifdef POSIX_GETGRGID_R
int
__posix_getgrgid_r(gid_t gid, struct group *gptr,
               char *buf, int buflen, struct group **result) {
#else /* POSIX_GETGRGID_R */
int
getgrgid_r(gid_t gid, struct group *gptr,
               char *buf, size_t buflen, struct group **result) {
#endif /* POSIX_GETGRGID_R */
       struct group *ge = getgrgid(gid);
       int res;

       if (ge == NULL) {
               *result = NULL;
               return (0);
       }

       res = copy_group(ge, gptr, buf, buflen);
       *result = res ? NULL : gptr;
       return (res);
}

#ifdef POSIX_GETGRGID_R
struct group *
getgrgid_r(gid_t gid, struct group *gptr,
               char *buf, int buflen) {
       struct group *ge = getgrgid(gid);
       int res;

       if (ge == NULL)
               return (NULL);

       res = copy_group(ge, gptr, buf, buflen);
       return (res ? NULL : gptr);
}
#endif

/*%
*      These assume a single context is in operation per thread.
*      If this is not the case we will need to call irs directly
*      rather than through the base functions.
*/

GROUP_R_RETURN
getgrent_r(struct group *gptr, GROUP_R_ARGS) {
       struct group *ge = getgrent();
       int res;

       if (ge == NULL) {
               return (GROUP_R_BAD);
       }

       res = copy_group(ge, gptr, buf, buflen);
       return (res ? GROUP_R_BAD : GROUP_R_OK);
}

GROUP_R_SET_RETURN
setgrent_r(GROUP_R_ENT_ARGS) {

       setgrent();
#ifdef GROUP_R_SET_RESULT
       return (GROUP_R_SET_RESULT);
#endif
}

GROUP_R_END_RETURN
endgrent_r(GROUP_R_ENT_ARGS) {

       endgrent();
       GROUP_R_END_RESULT(GROUP_R_OK);
}


#if 0
       /* XXX irs does not have a fgetgrent() */
GROUP_R_RETURN
fgetgrent_r(FILE *f, struct group *gptr, GROUP_R_ARGS) {
       struct group *ge = fgetgrent(f);
       int res;

       if (ge == NULL)
               return (GROUP_R_BAD);

       res = copy_group(ge, gptr, buf, buflen);
       return (res ? GROUP_R_BAD : GROUP_R_OK);
}
#endif

/* Private */

static int
copy_group(struct group *ge, struct group *gptr, char *buf, int buflen) {
       char *cp;
       int i, n;
       int numptr, len;

       /* Find out the amount of space required to store the answer. */
       numptr = 1; /*%< NULL ptr */
       len = (char *)ALIGN(buf) - buf;
       for (i = 0; ge->gr_mem[i]; i++, numptr++) {
               len += strlen(ge->gr_mem[i]) + 1;
       }
       len += strlen(ge->gr_name) + 1;
       len += strlen(ge->gr_passwd) + 1;
       len += numptr * sizeof(char*);

       if (len > buflen) {
               errno = ERANGE;
               return (ERANGE);
       }

       /* copy group id */
       gptr->gr_gid = ge->gr_gid;

       cp = (char *)ALIGN(buf) + numptr * sizeof(char *);

       /* copy official name */
       n = strlen(ge->gr_name) + 1;
       strcpy(cp, ge->gr_name);
       gptr->gr_name = cp;
       cp += n;

       /* copy member list */
       gptr->gr_mem = (char **)ALIGN(buf);
       for (i = 0 ; ge->gr_mem[i]; i++) {
               n = strlen(ge->gr_mem[i]) + 1;
               strcpy(cp, ge->gr_mem[i]);
               gptr->gr_mem[i] = cp;
               cp += n;
       }
       gptr->gr_mem[i] = NULL;

       /* copy password */
       n = strlen(ge->gr_passwd) + 1;
       strcpy(cp, ge->gr_passwd);
       gptr->gr_passwd = cp;
       cp += n;

       return (0);
}
#else /* GROUP_R_RETURN */
       static int getgrent_r_unknown_system = 0;
#endif /* GROUP_R_RETURN */
#endif /* !def(_REENTRANT) || !def(DO_PTHREADS) || !def(WANT_IRS_PW) */
/*! \file */

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