textscreen: Use safe string functions.

Define TXT_{StringCopy,StringConcat,snprintf,vsnprintf} as analogs of
the m_misc.c versions so that the textscreen library does not need a
dependency on the Doom code, and change all textscreen code to use
these instead of unsafe functions. This fixes #372.

1 files changed, 1 insertions, 0 deletions

diff --git a/textscreen/txt_spinctrl.h b/textscreen/txt_spinctrl.h
index 5a815319..006a0471 100644
--- a/textscreen/txt_spinctrl.h
+++ b/textscreen/txt_spinctrl.h
@@ -53,6 +53,7 @@ struct txt_spincontrol_s
     union { float f; int i; } min, max, *value, step; 
     int editing;
     char *buffer;
+    size_t buffer_len;
 };
 
 /**