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/*

 * Copyright (c) 2002-2006 The TenDRA Project <http://www.tendra.org/>.

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions are met:

 *

 * 1. Redistributions of source code must retain the above copyright notice,

 *    this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright notice,

 *    this list of conditions and the following disclaimer in the documentation

 *    and/or other materials provided with the distribution.

 * 3. Neither the name of The TenDRA Project nor the names of its contributors

 *    may be used to endorse or promote products derived from this software

 *    without specific, prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS

 * IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,

 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR

 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

 * EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;

 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,

 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR

 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF

 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 *

 * $Id$

 */

/*

    		 Crown Copyright (c) 1997

    This TenDRA(r) Computer Program is subject to Copyright

    owned by the United Kingdom Secretary of State for Defence

    acting through the Defence Evaluation and Research Agency

    (DERA).  It is made available to Recipients with a

    royalty-free licence for its use, reproduction, transfer

    to other parties and amendment for any purpose not excluding

    product development provided that any such use et cetera

    shall be deemed to be acceptance of the following conditions:-

        (1) Its Recipients shall ensure that this Notice is

        reproduced upon any copies or amended versions of it;

        (2) Any amended version of it shall be clearly marked to

        show both the nature of and the organisation responsible

        for the relevant amendment or amendments;

        (3) Its onward transfer from a recipient to another

        party shall be deemed to be that party's acceptance of

        these conditions;

        (4) DERA gives no warranty or assurance as to its

        quality or suitability for any purpose and DERA accepts

        no liability whatsoever in relation to any use to which

        it may be put.

*/

#include "config.h"

#if FS_STDARG

#include <stdarg.h>

#else

#include <varargs.h>

#endif

#include "c_types.h"

#include "error.h"

#include "buffer.h"

#include "ustring.h"

#include "xalloc.h"

/*

    FREE A BUFFER

    This routine frees the contents of the buffer bf.

*/

void

free_buffer(BUFFER *bf)

{

	xfree_nof(bf->start);

	bf->start = NULL;

	bf->posn = NULL;

	bf->end = NULL;

	return;

}

/*

    CLEAR A BUFFER

    This routine sets the current position of the buffer bf to the start

    of the buffer and sets the buffer file to f.  It returns bf.

*/

BUFFER *

clear_buffer(BUFFER *bf, FILE *f)

{

	bf->posn = bf->start;

	bf->file = f;

	return (bf);

}

/*

    OUTPUT THE CONTENTS OF A BUFFER

    This routine outputs the content of the buffer bf to the associated

    file and resets the position to the start of the buffer.  If fl is

    true then the file is flushed.

*/

void

output_buffer(BUFFER *bf, int fl)

{

	FILE *f = bf->file;

	if (f) {

		string s = bf->start;

		size_t n = (size_t)(bf->posn - s);

		if (n) {

			IGNORE fwrite((gen_ptr)s, sizeof(character), n, f);

			if (fl) {

				IGNORE fflush_v(f);

			}

			bf->posn = s;

		}

	}

	return;

}

/*

    EXTEND A BUFFER

    This routine extends the buffer bf.  s gives a pointer into the buffer,

    the corresponding position in the extended buffer is returned.

*/

string

extend_buffer(BUFFER *bf, string s)

{

	string p = bf->start;

	gen_size m = (gen_size)(s - p);

	gen_size n = (gen_size)(bf->end - p) + 500;

	p = xrealloc_nof(p, character, n + 12);

	bf->start = p;

	bf->end = p + n;

	return (p + m);

}

/*

    MAKE SPACE IN A BUFFER

    This routine makes space for at least m + 1 characters in the buffer

    bf following the position s.  It returns the corresponding position

    in the extended buffer.

*/

string

stretch_buffer(BUFFER *bf, string s, gen_size m)

{

	gen_size n = (gen_size)(bf->end - s);

	while (m >= n) {

		s = extend_buffer(bf, s);

		n = (gen_size)(bf->end - s);

	}

	return (s);

}

/*

    ADD A CHARACTER TO A BUFFER

    This routine adds the character c to the buffer bf.  Note that bf will

    not necessarily be null terminated after this routine.

*/

void

bfputc(BUFFER *bf, int c)

{

	string p = bf->posn;

	if (p == bf->end)p = extend_buffer(bf, p);

	*p = (character)c;

	bf->posn = p + 1;

	return;

}

/*

    ADD A STRING TO A BUFFER

    This routine adds the string s to the buffer bf.  Note that this

    guarantees that bf will be null terminated.

*/

void

bfputs(BUFFER *bf, string s)

{

	gen_size m = (gen_size)ustrlen(s);

	string p = stretch_buffer(bf, bf->posn, m);

	ustrcpy_v(p, s);

	bf->posn = p + m;

	return;

}

/*

    ADD A FORMATTED STRING TO A BUFFER

    This routine adds the string s to the buffer bf, using printf-like

    format characters to print the extra arguments.  Note that this

    guarantees that bf will be null terminated.

*/

void

bfprintf(BUFFER *bf, CONST char *s, ...) /* VARARGS */

{

	char c;

	string p;

	gen_size m;

	va_list args;

#if FS_STDARG

	va_start(args, s);

#else

	BUFFER *bf;

	CONST char *s;

	va_start(args);

	bf = va_arg(args, BUFFER *);

	s = va_arg(args, CONST char *);

#endif

	m = (gen_size)strlen(s);

	p = stretch_buffer(bf, bf->posn, m);

	/* Scan through format string */

	while (c = *(s++), c != 0) {

		if (c == '%') {

			int ext = 0;

			c = *(s++);

			if (c == 'l') {

				c = *(s++);

				ext = 1;

			}

			switch (c) {

			case 'c': {

				/* '%c' -> character (passed as int) */

				int ac = va_arg(args, int);

				*(p++) = (character)ac;

				break;

			}

			case 'd': {

				p = stretch_buffer(bf, p,(gen_size)50);

				if (ext) {

					/* '%ld' -> long */

					long al = va_arg(args, long);

					sprintf_v(strlit(p), "%ld", al);

				} else {

					/* '%d' -> int */

					int ad = va_arg(args, int);

					sprintf_v(strlit(p), "%d", ad);

				}

				p = p + ustrlen(p);

				break;

			}

			case 's': {

				/* '%s' -> string */

				string as = va_arg(args, string);

				if (as) {

					m = (gen_size)ustrlen(as);

					p = stretch_buffer(bf, p, m);

					ustrcpy_v(p, as);

					p += m;

				}

				break;

			}

			case 'u': {

				p = stretch_buffer(bf, p,(gen_size)50);

				if (ext) {

					/* '%lu' -> unsigned long */

					unsigned long al =

					    va_arg(args, unsigned long);

					sprintf_v(strlit(p), "%lu", al);

				} else {

					/* '%u' -> unsigned */

					unsigned au = va_arg(args, unsigned);

					sprintf_v(strlit(p), "%u", au);

				}

				p = p + ustrlen(p);

				break;

			}

			case 'x': {

				/* '%x' -> char * */

				char *ax = va_arg(args, char *);

				if (ax) {

					m = (gen_size)strlen(ax);

					p = stretch_buffer(bf, p, m);

					ustrcpy_v(p, ustrlit(ax));

					p += m;

				}

				break;

			}

			case '%': {

				/* '%%' -> percent */

				*(p++) = (character)c;

				break;

			}

			default : {

				/* Other characters */

				FAIL(Unknown format character);

				s = "<ERROR>";

				break;

			}

			}

		} else {

			*(p++) = (character)c;

		}

	}

	*p = 0;

	bf->posn = p;

	va_end(args);

	return;

}

/*

    READ A STRING FROM A BUFFER

    This routine reads at most n characters from the buffer bf into the

    string s.  It returns the number of characters read.

*/

gen_size

bfread(BUFFER *bf, string s, gen_size n)

{

	string p = bf->posn;

	gen_size m = (gen_size)(bf->end - p);

	if (m > n)m = n;

	if (m) {

		xumemcpy(s, p, m);

		bf->posn = p + m;

	}

	return (m);

}