I'm using this module in all of my GNU packages. One complication
might be that it depends on VERSION being defined. Feedback
appreciated.
2005-06-25 Simon Josefsson <[EMAIL PROTECTED]>
* modules/check_version: New file.
2005-06-25 Simon Josefsson <[EMAIL PROTECTED]>
* check_version.h, check_version.c: New file.
Index: lib/check_version.c
===================================================================
RCS file: lib/check_version.c
diff -N lib/check_version.c
--- /dev/null 1 Jan 1970 00:00:00 -0000
+++ lib/check_version.c 25 Jun 2005 09:39:48 -0000
@@ -0,0 +1,109 @@
+/* check_version.h --- Check version string compatibility.
+ Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005 Free
+ Software Foundation, Inc.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2, or (at your option)
+ any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software Foundation,
+ Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
+
+/* This file is based on src/global.c from Werner Koch's Libgcrypt.
+ Modularized for gnulib by Simon Josefsson. */
+
+#if HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <ctype.h>
+#include <string.h>
+
+static const char *
+parse_version_number (const char *s, int *number)
+{
+ int val = 0;
+
+ if (*s == '0' && isdigit (s[1]))
+ return NULL; /* leading zeros are not allowed */
+
+ for (; isdigit (*s); s++)
+ {
+ val *= 10;
+ val += *s - '0';
+ }
+
+ *number = val;
+
+ return val < 0 ? NULL : s;
+}
+
+
+static const char *
+parse_version_string (const char *s, int *major, int *minor, int *micro)
+{
+ s = parse_version_number (s, major);
+ if (!s || *s != '.')
+ return NULL;
+
+ s++;
+
+ s = parse_version_number (s, minor);
+ if (!s || *s != '.')
+ return NULL;
+
+ s++;
+
+ s = parse_version_number (s, micro);
+ if (!s)
+ return NULL;
+
+ return s; /* patchlevel */
+}
+
+/* Check that the the version of the library (i.e., the CPP symbol
+ * VERSION) is at minimum the requested one in REQ_VERSION (typically
+ * found in a header file) and return the version string. Return NULL
+ * if the condition is not satisfied. If a NULL is passed to this
+ * function, no check is done, but the version string is simply
+ * returned.
+ */
+extern const char *
+check_version (const char *req_version)
+{
+ const char *ver = VERSION;
+ int my_major, my_minor, my_micro;
+ int rq_major, rq_minor, rq_micro;
+ const char *my_plvl, *rq_plvl;
+
+ if (!req_version)
+ return ver;
+
+ my_plvl = parse_version_string (ver, &my_major, &my_minor, &my_micro);
+ if (!my_plvl)
+ return NULL; /* very strange our own version is bogus */
+
+ rq_plvl = parse_version_string (req_version, &rq_major, &rq_minor,
+ &rq_micro);
+ if (!rq_plvl)
+ return NULL; /* req version string is invalid */
+
+ if (my_major > rq_major
+ || (my_major == rq_major && my_minor > rq_minor)
+ || (my_major == rq_major && my_minor == rq_minor
+ && my_micro > rq_micro)
+ || (my_major == rq_major && my_minor == rq_minor
+ && my_micro == rq_micro && strcmp (my_plvl, rq_plvl) >= 0))
+ {
+ return ver;
+ }
+
+ return NULL;
+}
Index: lib/check_version.h
===================================================================
RCS file: lib/check_version.h
diff -N lib/check_version.h
--- /dev/null 1 Jan 1970 00:00:00 -0000
+++ lib/check_version.h 25 Jun 2005 09:39:48 -0000
@@ -0,0 +1,26 @@
+/* check_version.h --- Check version string compatibility.
+ Copyright (C) 2005 Free Software Foundation, Inc.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2, or (at your option)
+ any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software Foundation,
+ Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
+
+/* Written by Simon Josefsson. */
+
+#ifndef CHECK_VERSION_H
+# define CHECK_VERSION_H
+
+extern const char *
+check_version (const char *req_version);
+
+#endif /* CHECK_VERSION_H */
Index: modules/check_version
===================================================================
RCS file: modules/check_version
diff -N modules/check_version
--- /dev/null 1 Jan 1970 00:00:00 -0000
+++ modules/check_version 25 Jun 2005 09:39:48 -0000
@@ -0,0 +1,22 @@
+Description:
+Check version string compatibility.
+
+Files:
+lib/check_version.h
+lib/check_version.c
+
+Depends-on:
+
+configure.ac:
+
+Makefile.am:
+lib_SOURCES += check_version.h check_version.c
+
+Include:
+"check_version.h"
+
+License:
+LGPL
+
+Maintainer:
+Simon Josefsson
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