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, 3 insertions, 3 deletions

diff --git a/textscreen/examples/calculator.c b/textscreen/examples/calculator.c
index 7c77e838..3db60ef7 100644
--- a/textscreen/examples/calculator.c
+++ b/textscreen/examples/calculator.c
@@ -49,7 +49,7 @@ void UpdateInputBox(void)
 {
     char buf[20];
 
-    sprintf(buf, "  %i", input_value);
+    TXT_snprintf(buf, sizeof(buf), "  %i", input_value);
     TXT_SetLabel(input_box, buf);
 }
 
@@ -76,7 +76,7 @@ void AddNumberButton(txt_table_t *table, int value)
     val_copy = malloc(sizeof(int));
     *val_copy = value;
 
-    sprintf(buf, "  %i  ", value);
+    TXT_snprintf(buf, sizeof(buf), "  %i  ", value);
 
     TXT_AddWidget(table, TXT_NewButton2(buf, InsertNumber, val_copy));
 }
@@ -98,7 +98,7 @@ void AddOperatorButton(txt_table_t *table, char *label, operator_t op)
     op_copy = malloc(sizeof(operator_t));
     *op_copy = op;
 
-    sprintf(buf, "  %s  ", label);
+    TXT_snprintf(buf, sizeof(buf), "  %s  ", label);
 
     TXT_AddWidget(table, TXT_NewButton2(buf, Operator, op_copy));
 }