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238 lines
7.1 KiB
C
238 lines
7.1 KiB
C
/*
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* Copyright (c) 2001-2002 Michael David Adams.
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* All rights reserved.
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*/
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/* __START_OF_JASPER_LICENSE__
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*
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* JasPer License Version 2.0
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*
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* Copyright (c) 2001-2006 Michael David Adams
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* Copyright (c) 1999-2000 Image Power, Inc.
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* Copyright (c) 1999-2000 The University of British Columbia
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*
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* All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person (the
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* "User") obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without restriction,
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* including without limitation the rights to use, copy, modify, merge,
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* publish, distribute, and/or sell copies of the Software, and to permit
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* persons to whom the Software is furnished to do so, subject to the
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* following conditions:
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*
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* 1. The above copyright notices and this permission notice (which
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* includes the disclaimer below) shall be included in all copies or
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* substantial portions of the Software.
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*
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* 2. The name of a copyright holder shall not be used to endorse or
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* promote products derived from the Software without specific prior
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* written permission.
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*
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* THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL PART OF THIS
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* LICENSE. NO USE OF THE SOFTWARE IS AUTHORIZED HEREUNDER EXCEPT UNDER
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* THIS DISCLAIMER. THE SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS
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* "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
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* BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
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* PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. IN NO
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* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL
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* INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING
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* FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
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* NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
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* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. NO ASSURANCES ARE
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* PROVIDED BY THE COPYRIGHT HOLDERS THAT THE SOFTWARE DOES NOT INFRINGE
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* THE PATENT OR OTHER INTELLECTUAL PROPERTY RIGHTS OF ANY OTHER ENTITY.
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* EACH COPYRIGHT HOLDER DISCLAIMS ANY LIABILITY TO THE USER FOR CLAIMS
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* BROUGHT BY ANY OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL
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* PROPERTY RIGHTS OR OTHERWISE. AS A CONDITION TO EXERCISING THE RIGHTS
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* GRANTED HEREUNDER, EACH USER HEREBY ASSUMES SOLE RESPONSIBILITY TO SECURE
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* ANY OTHER INTELLECTUAL PROPERTY RIGHTS NEEDED, IF ANY. THE SOFTWARE
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* IS NOT FAULT-TOLERANT AND IS NOT INTENDED FOR USE IN MISSION-CRITICAL
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* SYSTEMS, SUCH AS THOSE USED IN THE OPERATION OF NUCLEAR FACILITIES,
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* AIRCRAFT NAVIGATION OR COMMUNICATION SYSTEMS, AIR TRAFFIC CONTROL
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* SYSTEMS, DIRECT LIFE SUPPORT MACHINES, OR WEAPONS SYSTEMS, IN WHICH
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* THE FAILURE OF THE SOFTWARE OR SYSTEM COULD LEAD DIRECTLY TO DEATH,
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* PERSONAL INJURY, OR SEVERE PHYSICAL OR ENVIRONMENTAL DAMAGE ("HIGH
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* RISK ACTIVITIES"). THE COPYRIGHT HOLDERS SPECIFICALLY DISCLAIM ANY
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* EXPRESS OR IMPLIED WARRANTY OF FITNESS FOR HIGH RISK ACTIVITIES.
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*
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* __END_OF_JASPER_LICENSE__
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*/
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/*
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* Tag-Value Parser Library
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*
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* $Id: jas_tvp.c,v 1.2 2008-05-26 09:40:52 vp153 Exp $
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*/
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/******************************************************************************\
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* Includes.
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\******************************************************************************/
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#include <assert.h>
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#include <stdio.h>
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#include <ctype.h>
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#include <stdlib.h>
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#include "jasper/jas_malloc.h"
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#include "jasper/jas_string.h"
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#include "jasper/jas_tvp.h"
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/******************************************************************************\
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* Macros.
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\******************************************************************************/
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/* Is the specified character valid for a tag name? */
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#define JAS_TVP_ISTAG(x) \
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(isalpha(x) || (x) == '_' || isdigit(x))
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/******************************************************************************\
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* Code for creating and destroying a tag-value parser.
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\******************************************************************************/
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jas_tvparser_t *jas_tvparser_create(const char *s)
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{
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jas_tvparser_t *tvp;
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if (!(tvp = jas_malloc(sizeof(jas_tvparser_t)))) {
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return 0;
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}
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if (!(tvp->buf = jas_strdup(s))) {
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jas_tvparser_destroy(tvp);
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return 0;
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}
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tvp->pos = tvp->buf;
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tvp->tag = 0;
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tvp->val = 0;
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return tvp;
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}
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void jas_tvparser_destroy(jas_tvparser_t *tvp)
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{
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if (tvp->buf) {
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jas_free(tvp->buf);
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}
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jas_free(tvp);
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}
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/******************************************************************************\
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* Main parsing code.
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\******************************************************************************/
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/* Get the next tag-value pair. */
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int jas_tvparser_next(jas_tvparser_t *tvp)
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{
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char *p;
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char *tag;
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char *val;
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/* Skip any leading whitespace. */
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p = tvp->pos;
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while (*p != '\0' && isspace(*p)) {
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++p;
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}
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/* Has the end of the input data been reached? */
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if (*p == '\0') {
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/* No more tags are present. */
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tvp->pos = p;
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return 1;
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}
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/* Does the tag name begin with a valid character? */
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if (!JAS_TVP_ISTAG(*p)) {
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return -1;
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}
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/* Remember where the tag name begins. */
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tag = p;
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/* Find the end of the tag name. */
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while (*p != '\0' && JAS_TVP_ISTAG(*p)) {
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++p;
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}
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/* Has the end of the input data been reached? */
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if (*p == '\0') {
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/* The value field is empty. */
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tvp->tag = tag;
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tvp->val = "";
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tvp->pos = p;
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return 0;
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}
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/* Is a value field not present? */
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if (*p != '=') {
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if (*p != '\0' && !isspace(*p)) {
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return -1;
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}
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*p++ = '\0';
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tvp->tag = tag;
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tvp->val = "";
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tvp->pos = p;
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return 0;
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}
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*p++ = '\0';
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val = p;
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while (*p != '\0' && !isspace(*p)) {
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++p;
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}
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if (*p != '\0') {
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*p++ = '\0';
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}
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tvp->pos = p;
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tvp->tag = tag;
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tvp->val = val;
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return 0;
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}
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/******************************************************************************\
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* Code for querying the current tag/value.
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\******************************************************************************/
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/* Get the current tag. */
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char *jas_tvparser_gettag(jas_tvparser_t *tvp)
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{
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return tvp->tag;
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}
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/* Get the current value. */
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char *jas_tvparser_getval(jas_tvparser_t *tvp)
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{
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return tvp->val;
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}
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/******************************************************************************\
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* Miscellaneous code.
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\******************************************************************************/
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/* Lookup a tag by name. */
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jas_taginfo_t *jas_taginfos_lookup(jas_taginfo_t *taginfos, const char *name)
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{
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jas_taginfo_t *taginfo;
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taginfo = taginfos;
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while (taginfo->id >= 0) {
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if (!strcmp(taginfo->name, name)) {
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return taginfo;
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}
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++taginfo;
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}
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return 0;
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}
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/* This function is simply for convenience. */
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/* One can avoid testing for the special case of a null pointer, by
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using this function. This function never returns a null pointer. */
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jas_taginfo_t *jas_taginfo_nonull(jas_taginfo_t *taginfo)
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{
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static jas_taginfo_t invalidtaginfo = {
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-1, 0
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};
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return taginfo ? taginfo : &invalidtaginfo;
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}
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