[PATCH] fix sysconf(_SC_LINE_MAX) to return LINE_MAX

[Christian Wiese <chris@opensde.net>]

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Hi,

attached is a patch for fixing sysconf(_SC_LINE_MAX) to not always
return -1 but LINE_MAX as defined in limits.h.

Greetings
Chris

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From 9f7717649e338e53e8d068e8722f03229d1dd99b Mon Sep 17 00:00:00 2001
From: Christian Wiese <chris@opensde.org>
Date: Wed, 7 May 2014 10:43:28 +0200
Subject: [PATCH] fix sysconf(_SC_LINE_MAX) to return LINE_MAX

The problem was discovered when calling the wall(1) command from util-linux

---------------------------------------------------------------------------
./wall "123"
wall: cannot allocate 18446744073709551615 bytes: Out of memory
---------------------------------------------------------------------------

triggered by 'makemsg()' in 'term-utils/wall.c' which uses sysconf() to
determine LINE_MAX for allocating a buffer through the builtin xmalloc()

---------------%<----------------------------------------------------------
char *p, *lbuf, *tmpname, *mbuf;
long line_max;

line_max = sysconf(_SC_LINE_MAX);
lbuf = xmalloc(line_max);
---------------%<----------------------------------------------------------

which fails because in musl sysconf(_SC_LINE_MAX) is always returning -1.

Signed-off-by: Christian Wiese <chris@opensde.org>
---
 src/conf/sysconf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/conf/sysconf.c b/src/conf/sysconf.c
index bf433d6..21e0743 100644
--- a/src/conf/sysconf.c
+++ b/src/conf/sysconf.c
@@ -66,7 +66,7 @@ long sysconf(int name)
 		[_SC_COLL_WEIGHTS_MAX] = COLL_WEIGHTS_MAX,
 		[_SC_EQUIV_CLASS_MAX] = -1, /* ?? */
 		[_SC_EXPR_NEST_MAX] = -1,
-		[_SC_LINE_MAX] = -1,
+		[_SC_LINE_MAX] = LINE_MAX,
 		[_SC_RE_DUP_MAX] = RE_DUP_MAX,
 		[_SC_CHARCLASS_NAME_MAX] = -1, /* ?? */
 		[_SC_2_VERSION] = VER,
-- 
1.9.1


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