mdw@git.distorted.org.uk Git - dpkg/blob - lib/dpkg/progname.c

   1 /*
   2  * libdpkg - Debian packaging suite library routines
   3  * progname.c - program name handling functions
   4  *
   5  * Copyright © 2011 Guillem Jover <guillem@debian.org>
   6  *
   7  * This is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  19  */
  20
  21 #include <config.h>
  22 #include <compat.h>
  23
  24 #include <errno.h>
  25 #include <stdlib.h>
  26
  27 #include <dpkg/path.h>
  28 #include <dpkg/progname.h>
  29
  30 static const char *progname;
  31
  32 /**
  33  * Set the program name.
  34  *
  35  * This function will set the program name which will be used by error
  36  * reporting functions, among others.
  37  *
  38  * @param name The new program name.
  39  */
  40 void
  41 dpkg_set_progname(const char *name)
  42 {
  43         progname = path_basename(name);
  44 }
  45
  46 #if defined(HAVE___PROGNAME)
  47 extern const char *__progname;
  48 #endif
  49
  50 /**
  51  * Get the program name.
  52  *
  53  * The program name might have been set previously by dpkg_set_progname(),
  54  * but if not this function will try to initialize it by system dependent
  55  * means, so it's half safe to not call dpkg_set_progname() at all. At worst
  56  * the function might return NULL in that case.
  57  *
  58  * @return A pointer to a static buffer with the program name.
  59  */
  60 const char *
  61 dpkg_get_progname(void)
  62 {
  63         if (progname == NULL) {
  64 #if defined(HAVE_PROGRAM_INVOCATION_SHORT_NAME)
  65                 progname = program_invocation_short_name;
  66 #elif defined(HAVE___PROGNAME)
  67                 progname = __progname;
  68 #elif defined(HAVE_GETPROGNAME)
  69                 progname = getprogname();
  70 #elif defined(HAVE_GETEXECNAME)
  71                 /* getexecname(3) returns an absolute path, normalize it. */
  72                 dpkg_set_progname(getexecname());
  73 #endif
  74         }
  75
  76         return progname;
  77 }