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/* Concatenate variable number of strings.
Copyright (C) 1991 Free Software Foundation, Inc.
Written by Fred Fish @ Cygnus Support
This file is part of the libiberty library.
Libiberty is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
Libiberty is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with libiberty; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA. */
/*
NAME
concat -- concatenate a variable number of strings
SYNOPSIS
#include <varargs.h>
char *concat (s1, s2, s3, ..., NULL)
DESCRIPTION
Concatenate a variable number of strings and return the result
in freshly malloc'd memory.
Returns NULL if insufficient memory is available. The argument
list is terminated by the first NULL pointer encountered. Pointers
to empty strings are ignored.
NOTES
This function uses xmalloc() which is expected to be a front end
function to malloc() that deals with low memory situations. In
typical use, if malloc() returns NULL then xmalloc() diverts to an
error handler routine which never returns, and thus xmalloc will
never return a NULL pointer. If the client application wishes to
deal with low memory situations itself, it should supply an xmalloc
that just directly invokes malloc and blindly returns whatever
malloc returns.
*/
#include <varargs.h>
#define NULLP (char *)0
extern char *xmalloc ();
/* VARARGS */
char *
concat (va_alist)
va_dcl
{
register int length = 0;
register char *newstr;
register char *end;
register char *arg;
va_list args;
/* First compute the size of the result and get sufficient memory. */
va_start (args);
while ((arg = va_arg (args, char *)) != NULLP)
{
length += strlen (arg);
}
newstr = (char *) xmalloc (length + 1);
va_end (args);
/* Now copy the individual pieces to the result string. */
if (newstr != NULLP)
{
va_start (args);
end = newstr;
while ((arg = va_arg (args, char *)) != NULLP)
{
while (*arg)
{
*end++ = *arg++;
}
}
*end = '\000';
va_end (args);
}
return (newstr);
}
#ifdef MAIN
/* Simple little test driver. */
main ()
{
printf ("\"\" = \"%s\"\n", concat (NULLP));
printf ("\"a\" = \"%s\"\n", concat ("a", NULLP));
printf ("\"ab\" = \"%s\"\n", concat ("a", "b", NULLP));
printf ("\"abc\" = \"%s\"\n", concat ("a", "b", "c", NULLP));
printf ("\"abcd\" = \"%s\"\n", concat ("ab", "cd", NULLP));
printf ("\"abcde\" = \"%s\"\n", concat ("ab", "c", "de", NULLP));
printf ("\"abcdef\" = \"%s\"\n", concat ("", "a", "", "bcd", "ef", NULLP));
}
#endif
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