msggetmask.c revision 3f54fd611f536639ec30dd53c48e5ec1897cc7d9
/***********************************************************************
* *
* This software is part of the ast package *
* Copyright (c) 1990-2011 AT&T Intellectual Property *
* and is licensed under the *
* Eclipse Public License, Version 1.0 *
* by AT&T Intellectual Property *
* *
* A copy of the License is available at *
* http://www.eclipse.org/org/documents/epl-v10.html *
* (with md5 checksum b35adb5213ca9657e911e9befb180842) *
* *
* Information and Software Systems Research *
* AT&T Research *
* Florham Park NJ *
* *
* Glenn Fowler <gsf@research.att.com> *
* *
***********************************************************************/
#pragma prototyped
#include "msglib.h"
/*
* put list of msg names in mask into buffer b,n
* ! as first char means inverted mask
* size of mask is returned
* negative of required size returned on overflow
* if b==0 then size is just returned
*/
int
msggetmask(char* buf, register int n, register unsigned long mask)
{
register char* b;
register const char* s;
register int m;
register int n0;
register int n1;
char* e;
if (n <= 1) return 0;
if (b = buf) e = b + n;
for (n0 = n1 = 0, m = 1; m <= MSG_STD; m++)
{
n = strlen(msgname(m)) + 1;
if (mask & MSG_MASK(m)) n1 += n;
else n0 += n;
}
if (n = (n1 > n0))
{
n0++;
if (!b) return n0;
n0 = -n0;
if (b >= e) return n0;
*b++ = '!';
}
else if (!b) return n1;
else n0 = -n1;
for (m = 1; m <= MSG_STD; m++)
if ((mask & MSG_MASK(m)) == 0 == n)
{
s = msg_info.name[m];
while (n1 = *s++)
{
if (b >= e) return n0;
*b++ = n1;
}
if (b >= e) return n0;
*b++ = ',';
}
if (b > buf && *(b - 1) == ',') b--;
*b = 0;
return b - buf;
}