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/* GNU's read utmp module.
Copyright (C) 1992-2001, 2003, 2004 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
/* Written by jla; revised by djm */
#include <config.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <string.h>
#include <stdlib.h>
#include "readutmp.h"
#include "xalloc.h"
#if USE_UNLOCKED_IO
# include "unlocked-io.h"
#endif
/* Copy UT->ut_name into storage obtained from malloc. Then remove any
trailing spaces from the copy, NUL terminate it, and return the copy. */
char *
extract_trimmed_name (const STRUCT_UTMP *ut)
{
char *p, *trimmed_name;
trimmed_name = xmalloc (sizeof (UT_USER (ut)) + 1);
strncpy (trimmed_name, UT_USER (ut), sizeof (UT_USER (ut)));
/* Append a trailing NUL. Some systems pad names shorter than the
maximum with spaces, others pad with NULs. Remove any trailing
spaces. */
trimmed_name[sizeof (UT_USER (ut))] = '\0';
for (p = trimmed_name + strlen (trimmed_name);
trimmed_name < p && p[-1] == ' ';
*--p = '\0')
continue;
return trimmed_name;
}
/* Read the utmp entries corresponding to file FILENAME into freshly-
malloc'd storage, set *UTMP_BUF to that pointer, set *N_ENTRIES to
the number of entries, and return zero. If there is any error,
return -1, setting errno, and don't modify the parameters. */
#ifdef UTMP_NAME_FUNCTION
int
read_utmp (const char *filename, size_t *n_entries, STRUCT_UTMP **utmp_buf)
{
size_t n_read;
size_t n_alloc = 4;
STRUCT_UTMP *utmp = xmalloc (n_alloc * sizeof *utmp);
STRUCT_UTMP *u;
/* Ignore the return value for now.
Solaris' utmpname returns 1 upon success -- which is contrary
to what the GNU libc version does. In addition, older GNU libc
versions are actually void. */
UTMP_NAME_FUNCTION (filename);
SET_UTMP_ENT ();
n_read = 0;
while ((u = GET_UTMP_ENT ()) != NULL)
{
if (n_read == n_alloc)
{
utmp = xnrealloc (utmp, n_alloc, 2 * sizeof *utmp);
n_alloc *= 2;
}
++n_read;
utmp[n_read - 1] = *u;
}
END_UTMP_ENT ();
*n_entries = n_read;
*utmp_buf = utmp;
return 0;
}
#else
int
read_utmp (const char *filename, size_t *n_entries, STRUCT_UTMP **utmp_buf)
{
FILE *utmp;
struct stat file_stats;
size_t n_read;
size_t size;
STRUCT_UTMP *buf;
utmp = fopen (filename, "r");
if (utmp == NULL)
return -1;
if (fstat (fileno (utmp), &file_stats) != 0)
{
int e = errno;
fclose (utmp);
errno = e;
return -1;
}
size = file_stats.st_size;
buf = xmalloc (size);
n_read = fread (buf, sizeof *buf, size / sizeof *buf, utmp);
if (ferror (utmp))
{
int e = errno;
free (buf);
fclose (utmp);
errno = e;
return -1;
}
if (fclose (utmp) != 0)
{
int e = errno;
free (buf);
errno = e;
return -1;
}
*n_entries = n_read;
*utmp_buf = buf;
return 0;
}
#endif
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