ref: f7e5af47f117be34669dc1e532d525dcbbff73f0
dir: /jas_tvp.c/
/*
* Copyright (c) 2001-2002 Michael David Adams.
* All rights reserved.
*/
/* __START_OF_JASPER_LICENSE__
*
* JasPer License Version 2.0
*
* Copyright (c) 2001-2006 Michael David Adams
* Copyright (c) 1999-2000 Image Power, Inc.
* Copyright (c) 1999-2000 The University of British Columbia
*
* All rights reserved.
*
* Permission is hereby granted, free of charge, to any person (the
* "User") obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without restriction,
* including without limitation the rights to use, copy, modify, merge,
* publish, distribute, and/or sell copies of the Software, and to permit
* persons to whom the Software is furnished to do so, subject to the
* following conditions:
*
* 1. The above copyright notices and this permission notice (which
* includes the disclaimer below) shall be included in all copies or
* substantial portions of the Software.
*
* 2. The name of a copyright holder shall not be used to endorse or
* promote products derived from the Software without specific prior
* written permission.
*
* THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL PART OF THIS
* LICENSE. NO USE OF THE SOFTWARE IS AUTHORIZED HEREUNDER EXCEPT UNDER
* THIS DISCLAIMER. THE SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS
* "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
* BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. IN NO
* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL
* INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING
* FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
* NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. NO ASSURANCES ARE
* PROVIDED BY THE COPYRIGHT HOLDERS THAT THE SOFTWARE DOES NOT INFRINGE
* THE PATENT OR OTHER INTELLECTUAL PROPERTY RIGHTS OF ANY OTHER ENTITY.
* EACH COPYRIGHT HOLDER DISCLAIMS ANY LIABILITY TO THE USER FOR CLAIMS
* BROUGHT BY ANY OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL
* PROPERTY RIGHTS OR OTHERWISE. AS A CONDITION TO EXERCISING THE RIGHTS
* GRANTED HEREUNDER, EACH USER HEREBY ASSUMES SOLE RESPONSIBILITY TO SECURE
* ANY OTHER INTELLECTUAL PROPERTY RIGHTS NEEDED, IF ANY. THE SOFTWARE
* IS NOT FAULT-TOLERANT AND IS NOT INTENDED FOR USE IN MISSION-CRITICAL
* SYSTEMS, SUCH AS THOSE USED IN THE OPERATION OF NUCLEAR FACILITIES,
* AIRCRAFT NAVIGATION OR COMMUNICATION SYSTEMS, AIR TRAFFIC CONTROL
* SYSTEMS, DIRECT LIFE SUPPORT MACHINES, OR WEAPONS SYSTEMS, IN WHICH
* THE FAILURE OF THE SOFTWARE OR SYSTEM COULD LEAD DIRECTLY TO DEATH,
* PERSONAL INJURY, OR SEVERE PHYSICAL OR ENVIRONMENTAL DAMAGE ("HIGH
* RISK ACTIVITIES"). THE COPYRIGHT HOLDERS SPECIFICALLY DISCLAIM ANY
* EXPRESS OR IMPLIED WARRANTY OF FITNESS FOR HIGH RISK ACTIVITIES.
*
* __END_OF_JASPER_LICENSE__
*/
/*
* Tag-Value Parser Library
*
* $Id$
*/
/******************************************************************************\
* Includes.
\******************************************************************************/
#define JAS_FOR_INTERNAL_USE_ONLY
#include "jasper/jas_tvp.h"
#include "jasper/jas_malloc.h"
#include "jasper/jas_string.h"
/******************************************************************************\
* Macros.
\******************************************************************************/
/* Is the specified character valid for a tag name? */
#define JAS_TVP_ISTAG(x) \
(isalpha(x) || (x) == '_' || isdigit(x))
/******************************************************************************\
* Code for creating and destroying a tag-value parser.
\******************************************************************************/
jas_tvparser_t *jas_tvparser_create(const char *s)
{
jas_tvparser_t *tvp;
if (!(tvp = jas_malloc(sizeof(jas_tvparser_t)))) {
return 0;
}
if (!(tvp->buf = jas_strdup(s))) {
jas_tvparser_destroy(tvp);
return 0;
}
tvp->pos = tvp->buf;
tvp->tag = 0;
tvp->val = 0;
return tvp;
}
void jas_tvparser_destroy(jas_tvparser_t *tvp)
{
if (tvp->buf) {
jas_free(tvp->buf);
}
jas_free(tvp);
}
/******************************************************************************\
* Main parsing code.
\******************************************************************************/
/* Get the next tag-value pair. */
int jas_tvparser_next(jas_tvparser_t *tvp)
{
char *p;
char *tag;
char *val;
/* Skip any leading whitespace. */
p = tvp->pos;
while (*p != '\0' && isspace(JAS_CAST(unsigned char, *p))) {
++p;
}
/* Has the end of the input data been reached? */
if (*p == '\0') {
/* No more tags are present. */
tvp->pos = p;
return 1;
}
/* Does the tag name begin with a valid character? */
if (!JAS_TVP_ISTAG(JAS_CAST(unsigned char, *p))) {
return -1;
}
/* Remember where the tag name begins. */
tag = p;
/* Find the end of the tag name. */
while (*p != '\0' && JAS_TVP_ISTAG(JAS_CAST(unsigned char, *p))) {
++p;
}
/* Has the end of the input data been reached? */
if (*p == '\0') {
/* The value field is empty. */
tvp->tag = tag;
tvp->val = "";
tvp->pos = p;
return 0;
}
/* Is a value field not present? */
if (*p != '=') {
if (*p != '\0' && !isspace(JAS_CAST(unsigned char, *p))) {
return -1;
}
*p++ = '\0';
tvp->tag = tag;
tvp->val = "";
tvp->pos = p;
return 0;
}
*p++ = '\0';
val = p;
while (*p != '\0' && !isspace(JAS_CAST(unsigned char, *p))) {
++p;
}
if (*p != '\0') {
*p++ = '\0';
}
tvp->pos = p;
tvp->tag = tag;
tvp->val = val;
return 0;
}
/******************************************************************************\
* Code for querying the current tag/value.
\******************************************************************************/
/* Get the current tag. */
const char *jas_tvparser_gettag(const jas_tvparser_t *tvp)
{
return tvp->tag;
}
/* Get the current value. */
const char *jas_tvparser_getval(const jas_tvparser_t *tvp)
{
return tvp->val;
}
/******************************************************************************\
* Miscellaneous code.
\******************************************************************************/
/* Lookup a tag by name. */
const jas_taginfo_t *jas_taginfos_lookup(const jas_taginfo_t *taginfos, const char *name)
{
const jas_taginfo_t *taginfo;
taginfo = taginfos;
while (taginfo->id >= 0) {
if (!strcmp(taginfo->name, name)) {
return taginfo;
}
++taginfo;
}
return 0;
}
/* This function is simply for convenience. */
/* One can avoid testing for the special case of a null pointer, by
using this function. This function never returns a null pointer. */
const jas_taginfo_t *jas_taginfo_nonull(const jas_taginfo_t *taginfo)
{
static const jas_taginfo_t invalidtaginfo = {
-1, 0
};
return taginfo ? taginfo : &invalidtaginfo;
}