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 <[email protected]>

1 files changed, 39 insertions, 0 deletions

diff --git a/src/sysutils.c b/src/sysutils.c
index bc31d92..6bdd76f 100644
--- a/src/sysutils.c
+++ b/src/sysutils.c
@@ -32,6 +32,9 @@
 #endif
 #include <sys/types.h>
 #include <fcntl.h>
+#ifdef HAVE_PWD_H
+# include <pwd.h>
+#endif
 
 #include "gpgrt-int.h"
 
@@ -337,3 +340,39 @@ _gpgrt_getcwd (void)
 #endif
     }
 }
+
+
+/* Get the standard home directory for user NAME. If NAME is NULL the
+ * directory for the current user is retruned.  Caller must release
+ * the returned string.  */
+char *
+_gpgrt_getpwdir (const char *name)
+{
+  char *result = NULL;
+#ifdef HAVE_PWD_H
+  struct passwd *pwd = NULL;
+
+  if (name)
+    {
+#ifdef HAVE_GETPWNAM
+      /* Fixme: We should use getpwnam_r if available.  */
+      pwd = getpwnam (name);
+#endif
+    }
+  else
+    {
+#ifdef HAVE_GETPWUID
+      /* Fixme: We should use getpwuid_r if available.  */
+      pwd = getpwuid (getuid());
+#endif
+    }
+  if (pwd)
+    {
+      result = _gpgrt_strdup (pwd->pw_dir);
+    }
+#else /*!HAVE_PWD_H*/
+  /* No support at all.  */
+  (void)name;
+#endif /*HAVE_PWD_H*/
+  return result;
+}