/* GNU's read utmp module.
- Copyright (C) 1992-2000 Free Software Foundation, Inc.
+ 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
#include <config.h>
+#include "readutmp.h"
+
+#include <errno.h>
#include <stdio.h>
+#include <sys/types.h>
#include <sys/stat.h>
-#if defined(STDC_HEADERS) || defined(HAVE_STRING_H)
-# include <string.h>
-#else
-# include <strings.h>
-#endif /* STDC_HEADERS || HAVE_STRING_H */
+#include <string.h>
+#include <stdlib.h>
-#include "readutmp.h"
+#include "xalloc.h"
-char *xmalloc ();
-char *realloc ();
+#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. */
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';
+ /* 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 non-zero and don't modify the parameters. */
+ return -1, setting errno, and don't modify the parameters. */
-#if HAVE_UTMPNAME
+#ifdef UTMP_NAME_FUNCTION
int
-read_utmp (const char *filename, int *n_entries, STRUCT_UTMP **utmp_buf)
+read_utmp (const char *filename, size_t *n_entries, STRUCT_UTMP **utmp_buf)
{
- int n_read;
+ size_t n_read;
+ size_t n_alloc = 4;
+ STRUCT_UTMP *utmp = xmalloc (n_alloc * sizeof *utmp);
STRUCT_UTMP *u;
- STRUCT_UTMP *utmp = NULL;
/* Ignore the return value for now.
Solaris' utmpname returns 1 upon success -- which is contrary
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 = (STRUCT_UTMP *) realloc (utmp, n_read * sizeof (STRUCT_UTMP));
- if (utmp == NULL)
- return 1;
utmp[n_read - 1] = *u;
}
#else
int
-read_utmp (const char *filename, int *n_entries, STRUCT_UTMP **utmp_buf)
+read_utmp (const char *filename, size_t *n_entries, STRUCT_UTMP **utmp_buf)
{
FILE *utmp;
struct stat file_stats;
utmp = fopen (filename, "r");
if (utmp == NULL)
- return 1;
+ return -1;
- fstat (fileno (utmp), &file_stats);
+ if (fstat (fileno (utmp), &file_stats) != 0)
+ {
+ int e = errno;
+ fclose (utmp);
+ errno = e;
+ return -1;
+ }
size = file_stats.st_size;
- if (size > 0)
- buf = (STRUCT_UTMP *) xmalloc (size);
- else
+ buf = xmalloc (size);
+ n_read = fread (buf, sizeof *buf, size / sizeof *buf, utmp);
+ if (ferror (utmp))
{
+ int e = errno;
+ free (buf);
fclose (utmp);
- return 1;
+ errno = e;
+ return -1;
+ }
+ if (fclose (utmp) != 0)
+ {
+ int e = errno;
+ free (buf);
+ errno = e;
+ 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);
+ *n_entries = n_read;
*utmp_buf = buf;
return 0;
}
-#endif /* HAVE_UTMPNAME */
+#endif