1 /* GNU's read utmp module.
2 Copyright (C) 1992-2000 Free Software Foundation, Inc.
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2, or (at your option)
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software Foundation,
16 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
18 /* Written by jla; revised by djm */
24 #include <sys/types.h>
26 #if defined(STDC_HEADERS) || defined(HAVE_STRING_H)
30 #endif /* STDC_HEADERS || HAVE_STRING_H */
37 /* Copy UT->ut_name into storage obtained from malloc. Then remove any
38 trailing spaces from the copy, NUL terminate it, and return the copy. */
41 extract_trimmed_name (const STRUCT_UTMP *ut)
43 char *p, *trimmed_name;
45 trimmed_name = xmalloc (sizeof (UT_USER (ut)) + 1);
46 strncpy (trimmed_name, UT_USER (ut), sizeof (UT_USER (ut)));
47 /* Append a trailing space character. Some systems pad names shorter than
48 the maximum with spaces, others pad with NULs. Remove any spaces. */
49 trimmed_name[sizeof (UT_USER (ut))] = ' ';
50 p = strchr (trimmed_name, ' ');
56 /* Read the utmp entries corresponding to file FILENAME into freshly-
57 malloc'd storage, set *UTMP_BUF to that pointer, set *N_ENTRIES to
58 the number of entries, and return zero. If there is any error,
59 return non-zero and don't modify the parameters. */
61 #ifdef UTMP_NAME_FUNCTION
64 read_utmp (const char *filename, int *n_entries, STRUCT_UTMP **utmp_buf)
68 STRUCT_UTMP *utmp = NULL;
70 /* Ignore the return value for now.
71 Solaris' utmpname returns 1 upon success -- which is contrary
72 to what the GNU libc version does. In addition, older GNU libc
73 versions are actually void. */
74 UTMP_NAME_FUNCTION (filename);
79 while ((u = GET_UTMP_ENT ()) != NULL)
82 utmp = (STRUCT_UTMP *) realloc (utmp, n_read * sizeof (STRUCT_UTMP));
85 utmp[n_read - 1] = *u;
99 read_utmp (const char *filename, int *n_entries, STRUCT_UTMP **utmp_buf)
102 struct stat file_stats;
107 utmp = fopen (filename, "r");
111 fstat (fileno (utmp), &file_stats);
112 size = file_stats.st_size;
114 buf = (STRUCT_UTMP *) xmalloc (size);
121 /* Use < instead of != in case the utmp just grew. */
122 n_read = fread (buf, 1, size, utmp);
123 if (ferror (utmp) || fclose (utmp) == EOF
127 *n_entries = size / sizeof (STRUCT_UTMP);