ossp-pkg/l2/l2_spec.c
1.4
/*
** L2 - OSSP Logging Library
** Copyright (c) 2001 The OSSP Project (http://www.ossp.org/)
** Copyright (c) 2001 Cable & Wireless Deutschland (http://www.cw.com/de/)
**
** This file is part of OSSP L2, a flexible logging library which
** can be found at http://www.ossp.org/pkg/l2/.
**
** Permission to use, copy, modify, and distribute this software for
** any purpose with or without fee is hereby granted, provided that
** the above copyright notice and this permission notice appear in all
** copies.
**
** THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 AUTHORS AND COPYRIGHT HOLDERS AND THEIR
** 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.
**
** l2_spec.c: channel tree specification support
*/
#include "l2.h"
#include "l2_p.h"
#include "l2_spec.h"
/* prototypes for Flex-generated scanner */
extern int l2_spec_lex_init(void *);
extern int l2_spec_lex_destroy(void *);
extern void l2_spec_set_extra(void *, void *);
/* prototypes for Bison-generated parser */
extern int l2_spec_parse(void *);
/* build a channel tree according to a textual specification */
l2_result_t l2_spec(l2_channel_t **ch, l2_env_t *env, const char *spec, ...)
{
va_list ap;
l2_result_t rv;
/* pass-through to va_list-based variant */
va_start(ap, spec);
rv = l2_vspec(ch, env, spec, ap);
va_end(ap);
return rv;
}
/* build a channel tree according to a textual specification (va_list variant) */
l2_result_t l2_vspec(l2_channel_t **ch, l2_env_t *env, const char *spec, va_list ap)
{
l2_spec_ctx_t ctx;
void *yyscan;
char *specstr;
/* on-the-fly create or take over specification string */
if ((specstr = l2_util_vasprintf(spec, ap)) == NULL)
return L2_ERR_ARG;
/* initialize scanner */
l2_spec_lex_init(&yyscan);
l2_spec_set_extra(&ctx, yyscan);
/* establish our own context which is passed
through the parser and scanner */
ctx.yyscan = yyscan;
ctx.inputptr = specstr;
ctx.inputbuf = specstr;
ctx.inputlen = strlen(specstr);
ctx.env = env;
ctx.ch = NULL;
ctx.chTmp = NULL;
ctx.rv = L2_OK;
/* start the parser loop */
if (l2_spec_parse(&ctx))
ctx.rv = (ctx.rv == L2_OK ? L2_ERR_INT : ctx.rv);
/* destroy scanner */
l2_spec_lex_destroy(yyscan);
/* destroy specification string */
free(specstr);
/* provide root/top-level channel as result */
*ch = ctx.ch;
return ctx.rv;
}
