Add an unpatched version of xz, XZ Utils, to /trunk/deps/third_party

xz/src/common/tuklib_progname.c

+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       tuklib_progname.c
+/// \brief      Program name to be displayed in messages
+//
+//  Author:     Lasse Collin
+//
+//  This file has been put into the public domain.
+//  You can do whatever you want with this file.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#include "tuklib_progname.h"
+#include <string.h>
+
+
+#if !HAVE_DECL_PROGRAM_INVOCATION_NAME
+char *progname = NULL;
+#endif
+
+
+extern void
+tuklib_progname_init(char **argv)
+{
+#ifdef TUKLIB_DOSLIKE
+        // On these systems, argv[0] always has the full path and .exe
+        // suffix even if the user just types the plain program name.
+        // We modify argv[0] to make it nicer to read.
+
+        // Strip the leading path.
+        char *p = argv[0] + strlen(argv[0]);
+        while (argv[0] < p && p[-1] != '/' && p[-1] != '\\')
+                --p;
+
+        argv[0] = p;
+
+        // Strip the .exe suffix.
+        p = strrchr(p, '.');
+        if (p != NULL)
+                *p = '\0';
+
+        // Make it lowercase.
+        for (p = argv[0]; *p != '\0'; ++p)
+                if (*p >= 'A' && *p <= 'Z')
+                        *p = *p - 'A' + 'a';
+#endif
+
+        progname = argv[0];
+        return;
+}