glib/gversion.c

   1 /* GLIB - Library of useful routines for C programming
   2  * Copyright (C) 1995-1998  Peter Mattis, Spencer Kimball and Josh MacDonald
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  * Boston, MA 02111-1307, USA.
  18  */
  19
  20 /*
  21  * Modified by the GLib Team and others 1997-2000.  See the AUTHORS
  22  * file for a list of people on the GLib Team.  See the ChangeLog
  23  * files for a list of changes.  These files are distributed with
  24  * GLib at ftp://ftp.gtk.org/pub/gtk/.
  25  */
  26
  27 #include "config.h"
  28
  29 #include "gversion.h"
  30
  31 /**
  32  * SECTION:version
  33  * @Title: Version Information
  34  * @Short_description: variables and functions to check the GLib version
  35  *
  36  * GLib provides version information, primarily useful in configure
  37  * checks for builds that have a configure script. Applications will
  38  * not typically use the features described here.
  39  */
  40
  41 /**
  42  * GLIB_MAJOR_VERSION:
  43  *
  44  * The major version number of the GLib library.
  45  *
  46  * Like #glib_major_version, but from the headers used at
  47  * application compile time, rather than from the library
  48  * linked against at application run time.
  49  */
  50
  51 /**
  52  * GLIB_MINOR_VERSION:
  53  *
  54  * The minor version number of the GLib library.
  55  *
  56  * Like #gtk_minor_version, but from the headers used at
  57  * application compile time, rather than from the library
  58  * linked against at application run time.
  59  */
  60
  61 /**
  62  * GLIB_MICRO_VERSION:
  63  *
  64  * The micro version number of the GLib library.
  65  *
  66  * Like #gtk_micro_version, but from the headers used at
  67  * application compile time, rather than from the library
  68  * linked against at application run time.
  69  */
  70
  71 /**
  72  * GLIB_CHECK_VERSION:
  73  * @major: the major version to check for
  74  * @minor: the minor version to check for
  75  * @micro: the micro version to check for
  76  *
  77  * Checks the version of the GLib library that is being compiled
  78  * against.
  79  *
  80  * <example>
  81  * <title>Checking the version of the GLib library</title>
  82  * <programlisting>
  83  *   if (!GLIB_CHECK_VERSION (1, 2, 0))
  84  *     g_error ("GLib version 1.2.0 or above is needed");
  85  * </programlisting>
  86  * </example>
  87  *
  88  * See glib_check_version() for a runtime check.
  89  *
  90  * Returns: %TRUE if the version of the GLib header files
  91  * is the same as or newer than the passed-in version.
  92  */
  93
  94 const guint glib_major_version = GLIB_MAJOR_VERSION;
  95 const guint glib_minor_version = GLIB_MINOR_VERSION;
  96 const guint glib_micro_version = GLIB_MICRO_VERSION;
  97 const guint glib_interface_age = GLIB_INTERFACE_AGE;
  98 const guint glib_binary_age = GLIB_BINARY_AGE;
  99
 100 /**
 101  * glib_check_version:
 102  * @required_major: the required major version.
 103  * @required_minor: the required minor version.
 104  * @required_micro: the required micro version.
 105  *
 106  * Checks that the GLib library in use is compatible with the
 107  * given version. Generally you would pass in the constants
 108  * #GLIB_MAJOR_VERSION, #GLIB_MINOR_VERSION, #GLIB_MICRO_VERSION
 109  * as the three arguments to this function; that produces
 110  * a check that the library in use is compatible with
 111  * the version of GLib the application or module was compiled
 112  * against.
 113  *
 114  * Compatibility is defined by two things: first the version
 115  * of the running library is newer than the version
 116  * @required_major.required_minor.@required_micro. Second
 117  * the running library must be binary compatible with the
 118  * version @required_major.required_minor.@required_micro
 119  * (same major version.)
 120  *
 121  * Return value: %NULL if the GLib library is compatible with the
 122  *   given version, or a string describing the version mismatch.
 123  *   The returned string is owned by GLib and must not be modified
 124  *   or freed.
 125  *
 126  * Since: 2.6
 127  */
 128 const gchar *
 129 glib_check_version (guint required_major,
 130                     guint required_minor,
 131                     guint required_micro)
 132 {
 133   gint glib_effective_micro = 100 * GLIB_MINOR_VERSION + GLIB_MICRO_VERSION;
 134   gint required_effective_micro = 100 * required_minor + required_micro;
 135
 136   if (required_major > GLIB_MAJOR_VERSION)
 137     return "GLib version too old (major mismatch)";
 138   if (required_major < GLIB_MAJOR_VERSION)
 139     return "GLib version too new (major mismatch)";
 140   if (required_effective_micro < glib_effective_micro - GLIB_BINARY_AGE)
 141     return "GLib version too new (micro mismatch)";
 142   if (required_effective_micro > glib_effective_micro)
 143     return "GLib version too old (micro mismatch)";
 144   return NULL;
 145 }