[tex-k] header special extension proposal

[Akira Kakuto]

Hi Karl, Hendri

> Wow, thanks.  I checked in a (slightly modified form of) the patch, so
> Hendri could test it.

Many thanks for the simplification.
In the previous example, Hendri cannot use braces
in pre code and post code. In the next example, he can use "balanced"
braces:

--- dospecial.c.orig	Wed Aug 17 07:45:56 2005
+++ dospecial.c	Wed Aug 17 10:13:04 2005
@@ -403,15 +403,21 @@
 	 while ((*p <= ' ' || *p == '=' || *p == '(') && *p != 0)
 	    p++ ;
 	 if(strncmp(p, "pre", 3) == 0) {
+	    int bracecount = 1, numbytes = 0, j ;
 	    while(*p != '{')
 	       p++ ;
 	    p++;
 	    r = p;
-	    while(*r != '}')
+	    for( ; ; ) {
+	       if (*r == '{') bracecount++ ;
+	       else if (*r == '}') bracecount-- ;
+	       if (bracecount == 0) break ;
 	       r++ ;
-	    pre = (char *)malloc(r-p+1);
+	       numbytes++ ;
+	    }
+	    pre = (char *)malloc(numbytes+1);
 	    r = pre ;
-	    while(*p != '}')
+	    for (j=0; j < numbytes; j++)
 	       *r++ = *p++;
 	    *r = 0;
 	    p++;
@@ -419,15 +425,21 @@
 	 while ((*p <= ' ' || *p == '=' || *p == '(') && *p != 0)
 	    p++ ;
 	 if(strncmp(p, "post", 4) == 0) {
+	    int bracecount = 1, numbytes = 0, j ;
 	    while(*p != '{')
 	       p++ ;
 	    p++;
 	    r = p;
-	    while(*r != '}')
+	    for( ; ; ) {
+	       if (*r == '{') bracecount++ ;
+	       else if (*r == '}') bracecount-- ;
+	       if (bracecount == 0) break ;
 	       r++ ;
-	    post = (char *)malloc(r-p+1);
+	       numbytes++ ;
+	    }
+	    post = (char *)malloc(numbytes+1);
 	    r = post ;
-	    while(*p != '}')
+	    for (j=0; j < numbytes; j++)
 	       *r++ = *p++;
 	    *r = 0;
 	 }