Fix \n interpolation; implement while.

The \n interpolation was not working: not substituting
the result. When this logic was added, then this was happening
even during expression evaluation. The right fix seems to be that
scan_expression function needs to suppress output!

Implemented the .while operator.  str_to_code needed to be fixed
so it only bangs together up to four characters, so that
we can recognize "while" as "whil". Hack hack!
Introduced the V4 macro for four character codes.

1 files changed, 45 insertions, 4 deletions

diff --git a/man2html/man2html.c b/man2html/man2html.c
index 12326c1..115d314 100644
--- a/man2html/man2html.c
+++ b/man2html/man2html.c
@@ -103,14 +103,21 @@ expand_string(int nr)
 	return NULL;
 }
 
+static char *
+expand_int(int nr)
+{
+    char *num = xmalloc(31);
+    sprintf(num, "%d", nr);
+    return num;
+}
+
 static int str_to_code(char *str)
 {
-	int code = 0, count = 0;
+	int code, count;
 
-	while (*str && !isspace(*str)) {
+	for (count = 0, code = 0; count < 4 && *str && !isspace(*str); count++) {
 		code *= 256;
 		code += *str++;
-		count++;
 	}
 
 	if (count == 1) {
@@ -665,6 +672,8 @@ scan_escape(char *c) {
 	    c++;
 	    i=V(c[0],c[1]);
 	    c=c+1;
+	} else if (*c=='[') {
+	    abort();
 	} else {
 	    i=V(c[0],' ');
 	}
@@ -680,7 +689,7 @@ scan_escape(char *c) {
 	    default: intresult=0; break;
 	    }
 	}
-	h="";
+	h=expand_int(intresult);
 	break;
     case 'w':
 	c++;
@@ -1187,6 +1196,9 @@ scan_table(char *c) {
 char *scan_expression(char *c, int *result) {
     int value=0,value2,sign=1,opex=0;
     char oper='c';
+    int exoutputp = output_possible;
+
+    output_possible = 0;
 
     if (*c=='!') {
 	c=scan_expression(c+1, &value);
@@ -1318,6 +1330,9 @@ char *scan_expression(char *c, int *result) {
 	if (*c==')') c++;
     }
     *result=value;
+
+    output_possible = exoutputp;
+
     return c;
 }
 
@@ -1824,6 +1839,32 @@ scan_request(char *c) {
 	    } else
 		c=skip_till_newline(c);
 	    break;
+	case V4('w','h','i','l'):
+	    /* groff extension
+	     * .while c anything
+	     * .while !c anything
+	     * .while N anything
+	     * .while !N anything
+	     * .while 'string1'string2' anything
+	     * .while !'string1'string2' anything
+	     */
+	    {
+		char *saved_c = c;
+
+		for (;;) {
+		    c=saved_c+j;
+		    c=scan_expression(c, &i);
+		    ifelseval=!i;
+		    if (i) {
+			c++;
+			(void) scan_troff(c,1,NULL);
+		    } else {
+			c=skip_till_newline(c);
+			break;
+		    }
+		}
+	    }
+	    break;
 	case V('i','g'):	/* .ig: ignore until .. */
 	    {
 		char *endwith="..\n";