[qfcc] Add a function to safely get cwd

getcwd is assumed to use malloc if its buff param is null. This may need
fixing in the future, but it's in one spot. The result in "saved" in the
non-progs pool.

tools/qfcc/include/strpool.h

@@ -53,6 +53,8 @@ int strpool_addstr (strpool_t *strpool, const char *str);
 */
 const char *save_string (const char *str);
 
+const char *save_cwd (void);
+
 const char *make_string (char *token, char **end);
 
 const char *html_string (const char *str);

tools/qfcc/source/strpool.c

@@ -39,6 +39,7 @@
 #endif
 #include <stdlib.h>
 #include <ctype.h>
+#include <unistd.h>
 
 #include "QF/dstring.h"
 #include "QF/hash.h"
@@ -140,6 +141,15 @@ save_string (const char *str)
 	return s;
 }
 
+const char *
+save_cwd (void)
+{
+	char       *cwd = getcwd (0, 0);
+	const char *str = save_string (cwd);
+	free (cwd);
+	return str;
+}
+
 const char *
 make_string (char *token, char **end)
 {