.

[gnulib.git] / lib / readutmp.c

diff --git a/lib/readutmp.c b/lib/readutmp.c
index 5f6bf88..f395352 100644 (file)
--- a/lib/readutmp.c
+++ b/lib/readutmp.c
@@ -1,5 +1,5 @@
 /* GNU's read utmp module.
-   Copyright (C) 92, 93, 94, 95, 96, 1997 Free Software Foundation, Inc.
+   Copyright (C) 1992-1999 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
@@ -19,6 +19,8 @@
 
 #include <config.h>
 
+#include <stdio.h>
+
 #include <sys/stat.h>
 #if defined(STDC_HEADERS) || defined(HAVE_STRING_H)
 # include <string.h>
@@ -29,13 +31,13 @@
 #include "readutmp.h"
 
 char *xmalloc ();
+char *realloc ();
 
 /* 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 (ut)
-  const STRUCT_UTMP *ut;
+extract_trimmed_name (const STRUCT_UTMP *ut)
 {
   char *p, *trimmed_name;
 
@@ -50,15 +52,50 @@ extract_trimmed_name (ut)
   return trimmed_name;
 }
 
-/* Read the utmp file FILENAME into *UTMP_BUF, set *N_ENTRIES to the
-   number of entries read, and return zero.  If there is any error,
+/* 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.  */
 
+#if HAVE_UTMPNAME
+
+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 (filename, n_entries, utmp_buf)
-  const char *filename;
-  int *n_entries;
-  STRUCT_UTMP **utmp_buf;
+read_utmp (const char *filename, int *n_entries, STRUCT_UTMP **utmp_buf)
 {
   FILE *utmp;
   struct stat file_stats;
@@ -91,3 +128,5 @@ read_utmp (filename, n_entries, utmp_buf)
 
   return 0;
 }
+
+#endif /* HAVE_UTMPNAME */