Implement the cmdutils.c show_license function.

patch by Stefano Sabatini: [stefano sabatini-lala /\ poste it]

Originally committed as revision 10149 to svn://svn.ffmpeg.org/ffmpeg/trunk

cmdutils.c

@@ -151,3 +151,40 @@ void print_error(const char *filename, int err)
         break;
     }
 }
+
+void show_license(void)
+{
+#ifdef CONFIG_GPL
+    printf(
+    "FFmpeg is free software; you can redistribute it and/or modify\n"
+    "it under the terms of the GNU General Public License as published by\n"
+    "the Free Software Foundation; either version 2 of the License, or\n"
+    "(at your option) any later version.\n"
+    "\n"
+    "FFmpeg is distributed in the hope that it will be useful,\n"
+    "but WITHOUT ANY WARRANTY; without even the implied warranty of\n"
+    "MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n"
+    "GNU General Public License for more details.\n"
+    "\n"
+    "You should have received a copy of the GNU General Public License\n"
+    "along with FFmpeg; if not, write to the Free Software\n"
+    "Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA\n"
+    );
+#else
+    printf(
+    "FFmpeg is free software; you can redistribute it and/or\n"
+    "modify it under the terms of the GNU Lesser General Public\n"
+    "License as published by the Free Software Foundation; either\n"
+    "version 2.1 of the License, or (at your option) any later version.\n"
+    "\n"
+    "FFmpeg is distributed in the hope that it will be useful,\n"
+    "but WITHOUT ANY WARRANTY; without even the implied warranty of\n"
+    "MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU\n"
+    "Lesser General Public License for more details.\n"
+    "\n"
+    "You should have received a copy of the GNU Lesser General Public\n"
+    "License along with FFmpeg; if not, write to the Free Software\n"
+    "Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA\n"
+    );
+#endif
+}

cmdutils.h

@@ -64,4 +64,10 @@ void parse_options(int argc, char **argv, const OptionDef *options,
 
 void print_error(const char *filename, int err);
 
+/**
+ * Prints on stdout the license of the program, which depends on the license of
+ * the compiled libav* libraries.
+ */
+void show_license(void);
+
 #endif /* _CMD_UTILS_H */