From 6b85ae268c04e1ab1c9cfde4ca349fca9d7ce9b8 Mon Sep 17 00:00:00 2001
From: Andre Fachat <afachat@gmx.de>
Date: Wed, 30 Oct 2019 22:41:52 +0100
Subject: [PATCH] fixes issue#4 by ignoreing quoted strings when finding a
 preprocessor pattern to be replaced

---
 xa/src/xap.c | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/xa/src/xap.c b/xa/src/xap.c
index e8ce798..a0d26bb 100644
--- a/xa/src/xap.c
+++ b/xa/src/xap.c
@@ -456,7 +456,25 @@ int pp_replace(char *to, char *ti, int a,int b)
      {
        while(t[0]!='\0')
        {
-          while(!isalpha(t[0]) && t[0]!='_')
+ 	  /* find start of a potential token to be replaced */
+          while(!isalpha(t[0]) && t[0]!='_') {
+	      
+	       /* escape strings quoted with " */ 
+	       if (t[0] == '\"') {
+		    do {
+			t++;
+			ti++;
+		    } while (t[0] && t[0]!='\"');
+	       }
+
+	       /* escape strings quoted with ' */ 
+	       if (t[0] == '\'') {
+		    do {
+			t++;
+			ti++;
+		    } while (t[0] && t[0]!='\'');
+	       }
+
                if(t[0]=='\0')
                     break;    /*return(E_OK);*/
                else
@@ -464,6 +482,7 @@ int pp_replace(char *to, char *ti, int a,int b)
                     t++;
                     ti++;
                }
+	  }
          
           for(l=0;isalnum(t[l])||t[l]=='_';l++);
           ld=l;