//-----------------------------------------------------------------------------
// Copyright © 2003 - Philip Howard - All rights reserved
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
//-----------------------------------------------------------------------------
// package	libh/string
// homepage	http://libh.slashusr.org/
//-----------------------------------------------------------------------------
// author	Philip Howard
// email	libh at ipal dot org
// homepage	http://phil.ipal.org/
//-----------------------------------------------------------------------------
// This file is best viewed using a fixed spaced font such as Courier
// and in a display at least 120 columns wide.
//-----------------------------------------------------------------------------

#include "string_lib.h"

__FMACRO_BEGIN__
//-----------------------------------------------------------------------------
// macro	str_dup_arg_sep
//
// purpose	Duplicate into allocated space the contents of zero or more
//		(multiple) strings with a separator string inserted between
//		multiple strings.
//
// arguments	1 (const char *) separator string to insert
//		1..N (const char *) source strings to duplicate
//
// returns	(char *) new allocated duplicate string, caller must free
//		(char *) NULL : error allocating string or other error
//
// warning	If other threads modify any source strings during duplication,
//		then results are unpredictable.
//-----------------------------------------------------------------------------
#define str_dup_arg_sep(sp,a...) ((str_dup_arg_sep)((sp),a,(const char*)(NULL)))

__FMACRO_END__

__PROTO_BEGIN__
//-----------------------------------------------------------------------------
// function	(str_dup_arg_sep)
//
// purpose	Duplicate into allocated space the contents of zero or more
//		(multiple) strings with a separator string inserted between
//		multiple strings.
//
// arguments	1 (const char *) separator string to insert
//		1..N (const char *) source strings to duplicate
//		N+1 (const char *) NULL to indicate no more strings
//
// returns	(char *) new allocated duplicate string, caller must free
//		(char *) NULL : error allocating string or other error
//
// warning	If other threads modify any source strings during duplication,
//		then results are unpredictable.
//-----------------------------------------------------------------------------
char *
(str_dup_arg_sep) (
    const char *	arg_sep
    ,
    const char *	arg_source
    ,
    ...
    )
__PROTO_END__
{
    char *		ptr_string	;

    //-- Determine total length and allocate new space.
    {
	va_list		var_args	;
	const char *	ptr_source	;
	size_t		total_space	;
	size_t		sep_space	;

	//-- Determine the separator space just once.
	{
	    const char *	ptr_sep		;

	    if ( ( ptr_sep = arg_sep ) ) {
		while ( * ptr_sep ) ++ ptr_sep;
		sep_space = ptr_sep - arg_sep;
	    } else {
		sep_space = 0;
	    }
	}

	//-- Add up lengths including separators in between.
	total_space = 1;
	if ( ( ptr_source = arg_source ) ) {
	    va_start( var_args, arg_source );
	    do {
		const char *	ptr_end		;

		//-- Get string length and add to total.
		ptr_end = ptr_source;
		while ( * ptr_end ) ++ ptr_end;
		total_space += ptr_end - ptr_source;

		//-- If there is another string, add in separator length.
		if ( ( ptr_source = va_arg( var_args, const char * ) ) ) {
		    total_space += sep_space;
		}
	    } while ( ptr_source );
	    va_end( var_args );
	}
	ptr_string = (char *) malloc( total_space );
	if ( ! ptr_string ) return ptr_string;
    }

    //-- Copy contents to new string.
    {
	va_list		var_args	;
	const char *	ptr_source	;
	char *		ptr_target	;

	ptr_target = ptr_string;
	if ( ( ptr_source = arg_source ) ) {
	    va_start( var_args, arg_source );
	    do {
		while ( ( * ptr_target = * ptr_source ) ) {
		    ++ ptr_target;
		    ++ ptr_source;
		}
		if ( ( ptr_source = va_arg( var_args, const char * ) ) ) {
		    const char *	ptr_sep		;

		    if ( ( ptr_sep = arg_sep ) ) {
			while ( ( * ptr_target = * ptr_sep ) ) {
			    ++ ptr_target;
			    ++ ptr_sep;
			}
		    }
		}
	    } while ( ptr_source );
	    va_end( var_args );
	}
	* ptr_target = 0;
    }

    //-- Return the new string.
    return ptr_string;
}