From: Jim Meyering <jim@meyering.net>
Date: Sat, 1 Sep 2001 09:50:48 +0000 (+0000)
Subject: *** empty log message ***
X-Git-Tag: cvs-readonly~5731
X-Git-Url: http://erislabs.org.uk/gitweb/?a=commitdiff_plain;h=7d7fb7355d5c231ef7b954d5f28f550efa16eaf5;p=gnulib.git

*** empty log message ***
---

diff --git a/lib/ChangeLog b/lib/ChangeLog
index 5a1d26951..418263ff1 100644
--- a/lib/ChangeLog
+++ b/lib/ChangeLog
@@ -1,5 +1,9 @@
 2001-09-01  Jim Meyering  <meyering@lucent.com>
 
+	* xreadlink.c: New file.
+	* xreadlink.h: New file.
+	* Makefile.am (libfetish_a_SOURCES): Add xreadlink.c and xreadlink.h.
+
 	* regex.c (uintptr_t) [!_LIBC]: Define to private_uintptr_t, so it
 	doesn't conflict with sparc-sun-solaris2.7's definition in
 	/usr/include/sys/int_types.h.
diff --git a/lib/xreadlink.c b/lib/xreadlink.c
new file mode 100644
index 000000000..333551fed
--- /dev/null
+++ b/lib/xreadlink.c
@@ -0,0 +1,72 @@
+/* exclude.c -- exclude file names
+
+   Copyright 2001 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; see the file COPYING.
+   If not, write to the Free Software Foundation,
+   59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+/* Written by Jim Meyering <jim@meyering.net>  */
+
+#if HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <stdio.h>
+#if HAVE_SYS_TYPES_H
+# include <sys/types.h>
+#endif
+#if HAVE_STDLIB_H
+# include <stdlib.h>
+#endif
+#if HAVE_UNISTD_H
+# include <unistd.h>
+#endif
+
+#include "xalloc.h"
+#include "xreadlink.h"
+
+/* Call readlink to get the symbolic link value of FILENAME.
+   Return a pointer to that NUL-terminated string in malloc'd storage.
+   If readlink fails, return NULL (use errno to diagnose).
+   If realloc fails, or if the link value is longer than SIZE_MAX :-),
+   give a diagnostic and exit.  */
+
+char *
+xreadlink (char const *filename, size_t *link_length_arg)
+{
+  size_t buf_size = 128;  /* must be a power of 2 */
+  char *buffer = NULL;
+
+  while (1)
+    {
+      int link_length;
+      buffer = (char *) xrealloc (buffer, buf_size);
+      link_length = readlink (filename, buffer, buf_size);
+      if (link_length < 0)
+	{
+	  free (buffer);
+	  return NULL;
+	}
+      if (link_length < buf_size)
+	{
+	  *link_length_arg = link_length;
+	  buffer[link_length] = 0;
+	  return buffer;
+	}
+      buf_size *= 2;
+      if (buf_size == 0)
+	xalloc_die ();
+    }
+}
diff --git a/lib/xreadlink.h b/lib/xreadlink.h
new file mode 100644
index 000000000..4fe13ab9a
--- /dev/null
+++ b/lib/xreadlink.h
@@ -0,0 +1,9 @@
+#ifndef PARAMS
+# if defined PROTOTYPES || (defined __STDC__ && __STDC__)
+#  define PARAMS(Args) Args
+# else
+#  define PARAMS(Args) ()
+# endif
+#endif
+
+char *xreadlink PARAMS ((char const *, size_t *));