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Subject: bin/12942: m4: len(`') returns `'
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>Number:         12942
>Category:       bin
>Synopsis:       m4: len(`') returns `'
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Tue Aug  3 09:00:01 PDT 1999
>Closed-Date:
>Last-Modified:
>Originator:     Claus Assmann
>Release:        FreeBSD 3.2-STABLE i386
>Organization:
Endmail.ORG
>Environment:

standard installation of FreeBSD 3.2-STABLE i386
or FreeBSD 2.2.7-RELEASE i386

>Description:

the len function in /usr/bin/m4 returns an empty string
if given an empty string as argument instead of 0.


>How-To-Repeat:

$ echo 'len()' | m4

$ echo 'len()' | gm4
0

>Fix:
	
Patch (fixes this problem, side-effects unknown...)

--- eval.c	Mon Aug  2 21:53:42 1999
+++ /usr/src/usr.bin/m4/eval.c	Mon Sep  7 15:09:13 1998
@@ -97,7 +97,7 @@
   * have macro-or-builtin() type call. We adjust
   * argc to avoid further checking..
   */
-	if (argc == 3 && !*(argv[2]) && (td & ~STATIC) != LENGTYPE)
+	if (argc == 3 && !*(argv[2]))
 		argc--;
 
 	switch (td & ~STATIC) {

>Release-Note:
>Audit-Trail:
>Unformatted:


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