kc3-lang/gnulib/lib/readutmp.c

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• Hash : 5e9efe00
  Author :
  Date : 2003-06-18T06:03:29
  

  Merge changes from coreutils.
  
  Include <string.h> and <stdlib.h> unconditionally.
  Remove explicit declarations of xmalloc and realloc.
  Include xalloc.h.
  (read_utmp): Remove anachronistic cast of xmalloc.
  

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• lib/readutmp.c

• /* GNU's read utmp module.
     Copyright (C) 1992-2001, 2003 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 "unlocked-io.h"
  #include "xalloc.h"
  
  /* 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 space character.  Some systems pad names shorter than
       the maximum with spaces, others pad with NULs.  Remove any spaces.  */
    trimmed_name[sizeof (UT_USER (ut))] = ' ';
    p = strchr (trimmed_name, ' ');
    if (p != NULL)
      *p = '\0';
    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 non-zero and don't modify the parameters.  */
  
  #ifdef UTMP_NAME_FUNCTION
  
  int
  read_utmp (const char *filename, int *n_entries, STRUCT_UTMP **utmp_buf)
  {
    int n_read;
    STRUCT_UTMP *u;
    STRUCT_UTMP *utmp = NULL;
  
    /* 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)
      {
        ++n_read;
        utmp = (STRUCT_UTMP *) realloc (utmp, n_read * sizeof (STRUCT_UTMP));
        if (utmp == NULL)
  	return 1;
        utmp[n_read - 1] = *u;
      }
  
    END_UTMP_ENT ();
  
    *n_entries = n_read;
    *utmp_buf = utmp;
  
    return 0;
  }
  
  #else
  
  int
  read_utmp (const char *filename, int *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;
  
    fstat (fileno (utmp), &file_stats);
    size = file_stats.st_size;
    if (size > 0)
      buf = xmalloc (size);
    else
      {
        fclose (utmp);
        return 1;
      }
  
    /* Use < instead of != in case the utmp just grew.  */
    n_read = fread (buf, 1, size, utmp);
    if (ferror (utmp) || fclose (utmp) == EOF
        || n_read < size)
      return 1;
  
    *n_entries = size / sizeof (STRUCT_UTMP);
    *utmp_buf = buf;
  
    return 0;
  }
  
  #endif
  

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