core: Add gpgrt_fnameconcat and gpgrt_absfnameconcat.

* src/gpg-error.h.in (gpgrt_fnameconcat): New.
(gpgrt_absfnameconcat): New.
* src/visibility.c (gpgrt_fnameconcat, gpgrt_absfnameconcat): New.
* src/stringutils.c: New file.
(_gpgrt_vfnameconcat): New.
(_gpgrt_fnameconcat, _gpgrt_absfnameconcat): New.
* src/gpg-error.def.in: Add new functions.
* src/gpg-error.vers: Ditto.
* src/sysutils.c: Include pwd.h.
(_gpgrt_getpwdir): New.
* configure.ac: Test for pwd.h, getpwnam, getpwuid, and their _r
variants.
* src/Makefile.am (libgpg_error_la_SOURCES): Add new file.

* tests/t-stringutils.c: New.
* tests/t-common.h (xmalloc, xstrdup, xfree): New.
(die): Kludge to avoid compiler warnings.
--

The new functions are based on the code of make_filename from GnuPG.
They have been written by me ages ago with only minor modifications by
David Shaw.  I re-license them from LGPL-3.0+ OR GPL-2.0+ to
LGPL-2.1-or-later.

Signed-off-by: Werner Koch <wk@gnupg.org>

1 files changed, 27 insertions, 0 deletions

diff --git a/src/visibility.c b/src/visibility.c
index d754032..5f88aad 100644
--- a/src/visibility.c
+++ b/src/visibility.c
@@ -1180,6 +1180,33 @@ gpgrt_cmp_version (const char *a, const char *b, int level)
 
 
 
+/* String utilities.  */
+char *
+gpgrt_fnameconcat (const char *first, ... )
+{
+  va_list arg_ptr;
+  char *result;
+
+  va_start (arg_ptr, first);
+  result = _gpgrt_vfnameconcat (0, first, arg_ptr);
+  va_end (arg_ptr);
+  return result;
+}
+
+char *
+gpgrt_absfnameconcat (const char *first, ... )
+{
+  va_list arg_ptr;
+  char *result;
+
+  va_start (arg_ptr, first);
+  result = _gpgrt_vfnameconcat (1, first, arg_ptr);
+  va_end (arg_ptr);
+  return result;
+}
+
+
+
 /* For consistency reasons we use function wrappers also for Windows
  * specific function despite that they are technically not needed.  */
 #ifdef HAVE_W32_SYSTEM