Patch for libpst (for review)

[Svante Signell <svante.signell@telia.com>]

Hi Jordi,

Saw on IRC logs that you needed a patch for libpst. What about the
attached patch?

If there is a need to build pst2dii that .cpp-file has to be patched too
(not done yet). Looks like it will be enabled if the right version
of /usr/bin/convert is found (probably from imagemagick). Not in the
build depends though. The /usr/bin/convert program I had installed
graphicsmagick-imagemagick-compat from was not the right one.

--- a/configure.in	2012-06-20 17:53:17.000000000 +0200
+++ b/configure.in	2012-06-20 18:01:24.000000000 +0200
@@ -4,6 +4,7 @@
 AC_CONFIG_HEADER([config.h])
 AM_INIT_AUTOMAKE
 AC_CANONICAL_HOST
+AC_USE_SYSTEM_EXTENSIONS
 
 #
 #  1. Remember that version-info is current:revision:age, and age <= current.
--- a/src/libpst.c	2011-12-25 00:19:11.000000000 +0100
+++ b/src/libpst.c	2012-06-20 19:03:57.000000000 +0200
@@ -361,19 +361,36 @@
 
     DEBUG_RET();
 
+#ifdef _GNU_SOURCE
+    pf->cwd = get_current_dir_name();
+#else
     pf->cwd = pst_malloc(PATH_MAX+1);
     getcwd(pf->cwd, PATH_MAX+1);
+#endif
     pf->fname = strdup(name);
     return 0;
 }
 
 
 int  pst_reopen(pst_file *pf) {
+#ifdef _GNU_SOURCE
+    char *cwd = NULL;
+    cwd = get_current_dir_name();
+    if (cwd == NULL)                       return -1;
+    if (chdir(pf->cwd))                    return -1;
+    if (!freopen(pf->fname, "rb", pf->fp)) return -1;
+    if (chdir(cwd)) {
+        free(cwd);
+        return -1;
+    }
+    free(cwd);
+#else
     char cwd[PATH_MAX];
     if (!getcwd(cwd, PATH_MAX))            return -1;
     if (chdir(pf->cwd))                    return -1;
     if (!freopen(pf->fname, "rb", pf->fp)) return -1;
     if (chdir(cwd))                        return -1;
+#endif
     return 0;
 }