xtag.c
资源名称:vlc-1.0.5.zip [点击查看]
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上传日期:2020-07-06
资源大小:29949k
文件大小:26k
源码类别:
midi
开发平台:
Unix_Linux
- /*****************************************************************************
- * xtag.c : a trivial parser for XML-like tags
- *****************************************************************************
- * Copyright (C) 2003-2004 Commonwealth Scientific and Industrial Research
- * Organisation (CSIRO) Australia
- * Copyright (C) 2000-2004 the VideoLAN team
- *
- * $Id: 681be12be1eb3b24b22a475aaf6732469c68ca3d $
- *
- * Authors: Conrad Parker <Conrad.Parker@csiro.au>
- * Andre Pang <Andre.Pang@csiro.au>
- * Gildas Bazin <gbazin@videolan.org>
- *
- * 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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
- *****************************************************************************/
- #ifdef HAVE_CONFIG_H
- # include "config.h"
- #endif
- #include <vlc_common.h>
- #include <vlc_plugin.h>
- #include "vlc_xml.h"
- #include "vlc_block.h"
- #include "vlc_stream.h"
- #include <ctype.h>
- #include <stdarg.h>
- #include <assert.h>
- #undef XTAG_DEBUG
- typedef struct _XList
- {
- struct _XList *prev;
- struct _XList *next;
- void *data;
- } XList;
- /*
- * struct XTag is kind of a union ... it normally represents a whole
- * tag (and its children), but it could alternatively represent some
- * PCDATA. Basically, if tag->pcdata is non-NULL, interpret only it and
- * ignore the name, attributes and inner_tags.
- */
- typedef struct _XTag
- {
- char *name;
- char *pcdata;
- struct _XTag *parent;
- XList *attributes;
- XList *children;
- XList *current_child;
- } XTag;
- typedef struct _XAttribute
- {
- char *name;
- char *value;
- } XAttribute;
- typedef struct _XTagParser
- {
- int valid; /* boolean */
- XTag *current_tag;
- char *start;
- char *end;
- } XTagParser;
- /*****************************************************************************
- * Module descriptor
- *****************************************************************************/
- static int Open ( vlc_object_t * );
- static void Close( vlc_object_t * );
- vlc_module_begin ()
- set_description( N_("Simple XML Parser") )
- set_capability( "xml", 5 )
- set_callbacks( Open, Close )
- vlc_module_end ()
- struct xml_reader_sys_t
- {
- XTag *p_root; /* Root tag */
- XTag *p_curtag; /* Current tag */
- XList *p_curattr; /* Current attribute */
- bool b_endtag;
- };
- static xml_reader_t *ReaderCreate( xml_t *, stream_t * );
- static void ReaderDelete( xml_reader_t * );
- static int ReaderRead( xml_reader_t * );
- static int ReaderNodeType( xml_reader_t * );
- static char *ReaderName( xml_reader_t * );
- static char *ReaderValue( xml_reader_t * );
- static int ReaderNextAttr( xml_reader_t * );
- static int ReaderUseDTD ( xml_reader_t *, bool );
- static void CatalogLoad( xml_t *, const char * );
- static void CatalogAdd( xml_t *, const char *, const char *, const char * );
- static XTag *xtag_new_parse( const char *, int );
- static char *xtag_get_name( XTag * );
- #if 0
- static char *xtag_get_pcdata( XTag * );
- static char *xtag_get_attribute( XTag *, char * );
- #endif
- static XTag *xtag_first_child( XTag *, char * );
- static XTag *xtag_next_child( XTag *, char * );
- static void xtag_free( XTag * );
- #if 0
- static int xtag_snprint( char *, int, XTag * );
- #endif
- /*****************************************************************************
- * Module initialization
- *****************************************************************************/
- static int Open( vlc_object_t *p_this )
- {
- xml_t *p_xml = (xml_t *)p_this;
- p_xml->pf_reader_create = ReaderCreate;
- p_xml->pf_reader_delete = ReaderDelete;
- p_xml->pf_catalog_load = CatalogLoad;
- p_xml->pf_catalog_add = CatalogAdd;
- return VLC_SUCCESS;
- }
- /*****************************************************************************
- * Module deinitialization
- *****************************************************************************/
- static void Close( vlc_object_t *p_this )
- {
- VLC_UNUSED(p_this);
- return;
- }
- /*****************************************************************************
- * Catalogue functions
- *****************************************************************************/
- static void CatalogLoad( xml_t *p_xml, const char *psz_filename )
- {
- VLC_UNUSED(psz_filename);
- msg_Dbg( p_xml, "catalog support not implemented" );
- }
- static void CatalogAdd( xml_t *p_xml, const char *psz_arg1,
- const char *psz_arg2, const char *psz_filename )
- {
- VLC_UNUSED(p_xml); VLC_UNUSED(psz_arg1); VLC_UNUSED(psz_arg2);
- VLC_UNUSED(psz_filename);
- }
- /*****************************************************************************
- * Reader functions
- *****************************************************************************/
- static xml_reader_t *ReaderCreate( xml_t *p_xml, stream_t *s )
- {
- xml_reader_t *p_reader;
- char *p_buffer, *p_new;
- int i_size, i_pos = 0, i_buffer = 2048;
- XTag *p_root;
- /* Open and read file */
- p_buffer = malloc( i_buffer );
- if( p_buffer == NULL )
- return NULL;
- while( ( i_size = stream_Read( s, &p_buffer[i_pos], 2048 ) ) == 2048 )
- {
- i_pos += i_size;
- i_buffer += i_size;
- p_new = realloc( p_buffer, i_buffer );
- if( !p_new )
- {
- free( p_buffer );
- return NULL;
- }
- p_buffer = p_new;
- }
- if( i_pos + i_size == 0 )
- {
- msg_Dbg( p_xml, "empty XML" );
- free( p_buffer );
- return NULL;
- }
- p_buffer[ i_pos + i_size ] = ' '; /* 0 terminated string */
- p_root = xtag_new_parse( p_buffer, i_buffer );
- if( !p_root )
- {
- msg_Warn( p_xml, "couldn't parse XML" );
- free( p_buffer );
- return NULL;
- }
- free( p_buffer );
- p_reader = malloc( sizeof(xml_reader_t) );
- if( !p_reader )
- return NULL;
- p_reader->p_sys = malloc( sizeof(xml_reader_sys_t) );
- if( !p_reader->p_sys )
- {
- free( p_reader );
- return NULL;
- }
- p_reader->p_sys->p_root = p_root;
- p_reader->p_sys->p_curtag = NULL;
- p_reader->p_sys->p_curattr = NULL;
- p_reader->p_sys->b_endtag = false;
- p_reader->p_xml = p_xml;
- p_reader->pf_read = ReaderRead;
- p_reader->pf_node_type = ReaderNodeType;
- p_reader->pf_name = ReaderName;
- p_reader->pf_value = ReaderValue;
- p_reader->pf_next_attr = ReaderNextAttr;
- p_reader->pf_use_dtd = ReaderUseDTD;
- return p_reader;
- }
- static void ReaderDelete( xml_reader_t *p_reader )
- {
- xtag_free( p_reader->p_sys->p_root );
- free( p_reader->p_sys );
- free( p_reader );
- }
- static int ReaderUseDTD ( xml_reader_t *p_reader, bool b_use )
- {
- VLC_UNUSED(p_reader); VLC_UNUSED(b_use);
- return VLC_EGENERIC;
- }
- static int ReaderRead( xml_reader_t *p_reader )
- {
- XTag *p_child;
- if( !p_reader->p_sys->p_curtag )
- {
- p_reader->p_sys->p_curtag = p_reader->p_sys->p_root;
- return 1;
- }
- while( true )
- {
- if( (p_child = xtag_next_child( p_reader->p_sys->p_curtag, 0 )) )
- {
- p_reader->p_sys->p_curtag = p_child;
- p_reader->p_sys->p_curattr = NULL;
- p_reader->p_sys->b_endtag = false;
- return 1;
- }
- if( p_reader->p_sys->p_curtag->name && /* no end tag for pcdata */
- !p_reader->p_sys->b_endtag )
- {
- p_reader->p_sys->b_endtag = true;
- return 1;
- }
- p_reader->p_sys->b_endtag = false;
- if( !p_reader->p_sys->p_curtag->parent ) return 0;
- p_reader->p_sys->p_curtag = p_reader->p_sys->p_curtag->parent;
- }
- return 0;
- }
- static int ReaderNodeType( xml_reader_t *p_reader )
- {
- if( p_reader->p_sys->p_curtag->name && p_reader->p_sys->b_endtag )
- return XML_READER_ENDELEM;
- if( p_reader->p_sys->p_curtag->name )
- return XML_READER_STARTELEM;
- if( p_reader->p_sys->p_curtag->pcdata )
- return XML_READER_TEXT;
- return XML_READER_NONE;
- }
- static char *ReaderName( xml_reader_t *p_reader )
- {
- const char *psz_name;
- if( !p_reader->p_sys->p_curattr )
- {
- psz_name = xtag_get_name( p_reader->p_sys->p_curtag );
- #ifdef XTAG_DEBUG
- fprintf( stderr, "TAG: %sn", psz_name );
- #endif
- }
- else
- psz_name = ((XAttribute *)p_reader->p_sys->p_curattr->data)->name;
- return psz_name ? strdup( psz_name ) : NULL;
- }
- static char *ReaderValue( xml_reader_t *p_reader )
- {
- const char *psz_name;
- if( p_reader->p_sys->p_curtag->pcdata )
- {
- #ifdef XTAG_DEBUG
- fprintf( stderr, "%sn", p_reader->p_sys->p_curtag->pcdata );
- #endif
- return strdup( p_reader->p_sys->p_curtag->pcdata );
- }
- if( !p_reader->p_sys->p_curattr ) return NULL;
- #ifdef XTAG_DEBUG
- fprintf( stderr, "%s=%sn", ((XAttribute *)p_reader->p_sys->p_curattr->data)->name,
- ((XAttribute *)p_reader->p_sys->p_curattr->data)->value );
- #endif
- psz_name = ((XAttribute *)p_reader->p_sys->p_curattr->data)->value;
- return psz_name ? strdup( psz_name ) : NULL;
- }
- static int ReaderNextAttr( xml_reader_t *p_reader )
- {
- if( !p_reader->p_sys->p_curattr )
- p_reader->p_sys->p_curattr = p_reader->p_sys->p_curtag->attributes;
- else if( p_reader->p_sys->p_curattr )
- p_reader->p_sys->p_curattr = p_reader->p_sys->p_curattr->next;
- return p_reader->p_sys->p_curattr ? VLC_SUCCESS : VLC_EGENERIC;
- }
- /*****************************************************************************
- * XTAG parser functions
- *****************************************************************************/
- static XList *xlist_append( XList *list, void *data )
- {
- XList *l, *last;
- l = (XList *)malloc( sizeof(XList) );
- l->prev = l->next = NULL;
- l->data = data;
- if( !list )
- return l;
- for( last = list; last; last = last->next )
- {
- if( !last->next )
- break;
- }
- if( last ) last->next = l;
- l->prev = last;
- return list;
- }
- static void xlist_free( XList *list )
- {
- XList *l, *ln;
- for( l = list; l; l = ln )
- {
- ln = l->next;
- free( l );
- }
- }
- /* Character classes */
- #define X_NONE 0
- #define X_WHITESPACE 1<<0
- #define X_OPENTAG 1<<1
- #define X_CLOSETAG 1<<2
- #define X_DQUOTE 1<<3
- #define X_SQUOTE 1<<4
- #define X_EQUAL 1<<5
- #define X_SLASH 1<<6
- #define X_QMARK 1<<7
- #define X_DASH 1<<8
- #define X_EMARK 1<<9
- static int xtag_cin( char c, int char_class )
- {
- if( char_class & X_WHITESPACE ) if( isspace(c) ) return true;
- if( char_class & X_OPENTAG ) if( c == '<' ) return true;
- if( char_class & X_CLOSETAG ) if( c == '>' ) return true;
- if( char_class & X_DQUOTE ) if( c == '"' ) return true;
- if( char_class & X_SQUOTE ) if( c == ''' ) return true;
- if( char_class & X_EQUAL ) if( c == '=' ) return true;
- if( char_class & X_SLASH ) if( c == '/' ) return true;
- if( char_class & X_QMARK ) if( c == '?' ) return true;
- if( char_class & X_DASH ) if( c == '-' ) return true;
- if( char_class & X_EMARK ) if( c == '!' ) return true;
- return false;
- }
- static int xtag_index( XTagParser *parser, int char_class )
- {
- char *s = parser->start;
- int i;
- for( i = 0; s[i] && s != parser->end; i++ )
- {
- if( xtag_cin( s[i], char_class ) ) return i;
- }
- return -1;
- }
- static void xtag_skip_over( XTagParser *parser, int char_class )
- {
- char *s = parser->start;
- int i;
- if( !parser->valid ) return;
- for( i = 0; s[i] && s != parser->end; i++ )
- {
- if( !xtag_cin( s[i], char_class ) )
- {
- parser->start = &s[i];
- return;
- }
- }
- return;
- }
- static void xtag_skip_whitespace( XTagParser * parser )
- {
- xtag_skip_over( parser, X_WHITESPACE );
- }
- static char *xtag_slurp_to( XTagParser *parser, int good_end, int bad_end )
- {
- char *ret, *s = parser->start;
- int xi;
- if( !parser->valid ) return NULL;
- xi = xtag_index( parser, good_end | bad_end );
- if( xi > 0 && xtag_cin (s[xi], good_end) )
- {
- ret = malloc( xi+1 );
- strncpy( ret, s, xi );
- ret[xi] = ' ';
- parser->start = &s[xi];
- return ret;
- }
- return NULL;
- }
- static int xtag_assert_and_pass( XTagParser *parser, int char_class )
- {
- char *s = parser->start;
- if( !parser->valid ) return false;
- if( !xtag_cin( s[0], char_class ) )
- {
- parser->valid = false;
- return false;
- }
- parser->start = &s[1];
- return true;
- }
- static char *xtag_slurp_quoted( XTagParser *parser )
- {
- char * ret, *s;
- int quote = X_DQUOTE; /* quote char to match on */
- int xi;
- if( !parser->valid ) return NULL;
- xtag_skip_whitespace( parser );
- s = parser->start;
- if( xtag_cin( s[0], X_SQUOTE ) ) quote = X_SQUOTE;
- if( !xtag_assert_and_pass( parser, quote ) ) return NULL;
- s = parser->start;
- for( xi = 0; s[xi]; xi++ )
- {
- if( xtag_cin( s[xi], quote ) )
- {
- if( !(xi > 1 && s[xi-1] == '\') ) break;
- }
- }
- ret = malloc( xi+1 );
- strncpy( ret, s, xi );
- ret[xi] = ' ';
- parser->start = &s[xi];
- if( !xtag_assert_and_pass( parser, quote ) )
- {
- free( ret );
- return NULL;
- }
- return ret;
- }
- static XAttribute *xtag_parse_attribute( XTagParser *parser )
- {
- XAttribute *attr;
- char *name, *value;
- char *s;
- if( !parser->valid )
- return NULL;
- xtag_skip_whitespace( parser );
- name = xtag_slurp_to( parser, X_WHITESPACE|X_EQUAL, X_SLASH|X_CLOSETAG );
- if( !name )
- return NULL;
- xtag_skip_whitespace( parser );
- s = parser->start;
- if( !xtag_assert_and_pass( parser, X_EQUAL ) )
- {
- #ifdef XTAG_DEBUG
- fprintf( stderr, "xtag: attr failed EQUAL on <%s>n", name );
- #endif
- goto err_free_name;
- }
- xtag_skip_whitespace( parser );
- value = xtag_slurp_quoted( parser );
- if( value == NULL )
- {
- #ifdef XTAG_DEBUG
- fprintf (stderr, "Got NULL quoted attribute valuen");
- #endif
- goto err_free_name;
- }
- attr = malloc( sizeof (*attr) );
- attr->name = name;
- attr->value = value;
- return attr;
- err_free_name:
- free (name);
- parser->valid = false;
- return NULL;
- }
- static XTag *xtag_parse_tag( XTagParser *parser )
- {
- XTag *tag, *inner;
- XAttribute *attr;
- char *name;
- char *pcdata;
- char *s;
- int xi;
- if( !parser->valid ) return NULL;
- s = parser->start;
- /* if this starts a comment tag, skip until end */
- if( (parser->end - parser->start) > 7 &&
- xtag_cin( s[0], X_OPENTAG ) && xtag_cin( s[1], X_EMARK ) &&
- xtag_cin( s[2], X_DASH ) && xtag_cin( s[3], X_DASH ) )
- {
- parser->start = s = &s[4];
- while( (xi = xtag_index( parser, X_DASH )) >= 0 )
- {
- parser->start = s = &s[xi+1];
- if( xtag_cin( s[0], X_DASH ) && xtag_cin( s[1], X_CLOSETAG ) )
- {
- parser->start = &s[2];
- xtag_skip_whitespace( parser );
- return xtag_parse_tag( parser );
- }
- }
- return NULL;
- }
- /* ignore processing instructions '<?' ... '?>' */
- if( (parser->end - parser->start) > 4 &&
- xtag_cin( s[0], X_OPENTAG ) && xtag_cin( s[1], X_QMARK ) )
- {
- parser->start = s = &s[2];
- while ((xi = xtag_index( parser, X_QMARK )) >= 0) {
- if (xtag_cin( s[xi+1], X_CLOSETAG )) {
- parser->start = &s[xi+2];
- xtag_skip_whitespace( parser );
- return xtag_parse_tag( parser );
- }
- }
- return NULL;
- }
- /* ignore doctype '<!DOCTYPE' ... '>' */
- if ( (parser->end - parser->start) > 8 &&
- !strncmp( s, "<!DOCTYPE", 9 ) ) {
- xi = xtag_index( parser, X_CLOSETAG );
- if ( xi > 0 ) {
- parser->start = s = &s[xi+1];
- xtag_skip_whitespace( parser );
- return xtag_parse_tag( parser );
- }
- else {
- return NULL;
- }
- }
- if( (pcdata = xtag_slurp_to( parser, X_OPENTAG, X_NONE )) != NULL )
- {
- tag = malloc( sizeof(*tag) );
- tag->name = NULL;
- tag->pcdata = pcdata;
- tag->parent = parser->current_tag;
- tag->attributes = NULL;
- tag->children = NULL;
- tag->current_child = NULL;
- return tag;
- }
- /* if this starts a close tag, return NULL and let the parent take it */
- if( xtag_cin( s[0], X_OPENTAG ) && xtag_cin( s[1], X_SLASH ) )
- return NULL;
- /* parse CDATA content */
- if ( (parser->end - parser->start) > 8 &&
- !strncmp( s, "<![CDATA[", 9 ) ) {
- parser->start = s = &s[9];
- while (parser->end - s > 2) {
- if (strncmp( s, "]]>", 3 ) == 0) {
- if ( !(tag = malloc( sizeof(*tag))) ) return NULL;
- if ( !(pcdata = malloc( s - parser->start + 1)) )
- {
- free( tag );
- return NULL;
- }
- strncpy( pcdata, parser->start, s - parser->start );
- pcdata[s - parser->start]=' ';
- parser->start = s = &s[3];
- tag->name = NULL;
- tag->pcdata = pcdata;
- tag->parent = parser->current_tag;
- tag->attributes = NULL;
- tag->children = NULL;
- tag->current_child = NULL;
- return tag;
- }
- else {
- s++;
- }
- }
- return NULL;
- }
- if( !xtag_assert_and_pass( parser, X_OPENTAG ) ) return NULL;
- name = xtag_slurp_to( parser, X_WHITESPACE|X_SLASH|X_CLOSETAG, X_NONE );
- if( name == NULL ) return NULL;
- #ifdef XTAG_DEBUG
- fprintf (stderr, "<%s ...n", name);
- #endif
- tag = malloc( sizeof(*tag) );
- tag->name = name;
- tag->pcdata = NULL;
- tag->parent = parser->current_tag;
- tag->attributes = NULL;
- tag->children = NULL;
- tag->current_child = NULL;
- s = parser->start;
- if( xtag_cin( s[0], X_WHITESPACE ) )
- {
- while( (attr = xtag_parse_attribute( parser )) != NULL )
- {
- tag->attributes = xlist_append( tag->attributes, attr );
- }
- }
- xtag_skip_whitespace( parser );
- s = parser->start;
- if( xtag_cin( s[0], X_CLOSETAG ) )
- {
- parser->current_tag = tag;
- xtag_assert_and_pass( parser, X_CLOSETAG );
- while( (inner = xtag_parse_tag( parser ) ) != NULL )
- {
- tag->children = xlist_append( tag->children, inner );
- }
- parser->current_tag = tag->parent;
- xtag_skip_whitespace( parser );
- xtag_assert_and_pass( parser, X_OPENTAG );
- xtag_assert_and_pass( parser, X_SLASH );
- name = xtag_slurp_to( parser, X_WHITESPACE | X_CLOSETAG, X_NONE );
- if( name )
- {
- if( strcmp( name, tag->name ) )
- {
- #ifdef XTAG_DEBUG
- fprintf (stderr, "got %s expected %sn", name, tag->name);
- #endif
- parser->valid = false;
- }
- free( name );
- }
- xtag_skip_whitespace( parser );
- xtag_assert_and_pass( parser, X_CLOSETAG );
- xtag_skip_whitespace( parser );
- }
- else
- {
- xtag_assert_and_pass( parser, X_SLASH );
- xtag_assert_and_pass( parser, X_CLOSETAG );
- xtag_skip_whitespace( parser );
- }
- return tag;
- }
- static void xtag_free( XTag *xtag )
- {
- XList *l;
- XAttribute *attr;
- XTag *child;
- if( !xtag )
- return;
- free( xtag->name );
- free( xtag->pcdata );
- for( l = xtag->attributes; l; l = l->next )
- {
- if( (attr = (XAttribute *)l->data) != NULL )
- {
- free( attr->name );
- free( attr->value );
- free( attr );
- }
- }
- xlist_free( xtag->attributes );
- for( l = xtag->children; l; l = l->next )
- {
- child = (XTag *)l->data;
- xtag_free( child );
- }
- xlist_free( xtag->children );
- free( xtag );
- }
- static XTag *xtag_new_parse( const char *s, int n )
- {
- XTagParser parser;
- XTag *tag, *ttag, *wrapper;
- parser.valid = true;
- parser.current_tag = NULL;
- parser.start = (char *)s;
- if( n == -1 ) parser.end = NULL;
- else if( n == 0 )
- {
- #ifdef XTAG_DEBUG
- fprintf (stderr, "empty buffern");
- #endif
- return NULL;
- }
- else parser.end = (char *)&s[n];
- /* can't have whitespace pcdata outside rootnode */
- xtag_skip_whitespace( &parser );
- tag = xtag_parse_tag( &parser );
- if( !parser.valid )
- {
- #ifdef XTAG_DEBUG
- fprintf (stderr, "invalid filen");
- #endif
- xtag_free( tag );
- return NULL;
- }
- if( (ttag = xtag_parse_tag( &parser )) != NULL )
- {
- if( !parser.valid )
- {
- xtag_free( ttag );
- return tag;
- }
- wrapper = malloc( sizeof(XTag) );
- wrapper->name = NULL;
- wrapper->pcdata = NULL;
- wrapper->parent = NULL;
- wrapper->attributes = NULL;
- wrapper->children = NULL;
- wrapper->current_child = NULL;
- wrapper->children = xlist_append( wrapper->children, tag );
- wrapper->children = xlist_append( wrapper->children, ttag );
- while( (ttag = xtag_parse_tag( &parser )) != NULL )
- {
- if( !parser.valid )
- {
- xtag_free( ttag );
- return wrapper;
- }
- wrapper->children = xlist_append( wrapper->children, ttag );
- }
- return wrapper;
- }
- return tag;
- }
- static char *xtag_get_name( XTag *xtag )
- {
- return xtag ? xtag->name : NULL;
- }
- #if 0
- static char *xtag_get_pcdata( XTag *xtag )
- {
- XList *l;
- XTag *child;
- if( xtag == NULL ) return NULL;
- for( l = xtag->children; l; l = l->next )
- {
- child = (XTag *)l->data;
- if( child->pcdata != NULL )
- {
- return child->pcdata;
- }
- }
- return NULL;
- }
- static char *xtag_get_attribute( XTag *xtag, char *attribute )
- {
- XList *l;
- XAttribute *attr;
- if( xtag == NULL ) return NULL;
- for( l = xtag->attributes; l; l = l->next )
- {
- if( (attr = (XAttribute *)l->data) != NULL )
- {
- if( !strcmp( attr->name, attribute ) ) return attr->value;
- }
- }
- return NULL;
- }
- #endif
- static XTag *xtag_first_child( XTag *xtag, char *name )
- {
- XList *l;
- XTag *child;
- if( xtag == NULL ) return NULL;
- if( (l = xtag->children) == NULL ) return NULL;
- if( name == NULL )
- {
- xtag->current_child = l;
- return (XTag *)l->data;
- }
- for( ; l; l = l->next )
- {
- child = (XTag *)l->data;
- if( !strcmp( child->name, name ) )
- {
- xtag->current_child = l;
- return child;
- }
- }
- xtag->current_child = NULL;
- return NULL;
- }
- static XTag *xtag_next_child( XTag *xtag, char *name )
- {
- XList *l;
- XTag *child;
- if( xtag == NULL ) return NULL;
- if( (l = xtag->current_child) == NULL )
- return xtag_first_child( xtag, name );
- if( (l = l->next) == NULL ) return NULL;
- if( name == NULL )
- {
- xtag->current_child = l;
- return (XTag *)l->data;
- }
- for( ; l; l = l->next )
- {
- child = (XTag *)l->data;
- if( !strcmp( child->name, name ) )
- {
- xtag->current_child = l;
- return child;
- }
- }
- xtag->current_child = NULL;
- return NULL;
- }
- #if 0
- /*
- * This snprints function takes a variable list of char *, the last of
- * which must be NULL, and prints each in turn to buf.
- * Returns C99-style total length that would have been written, even if
- * this is larger than n.
- */
- static int xtag_snprints( char *buf, int n, ... )
- {
- va_list ap;
- char *s;
- int len, to_copy, total = 0;
- va_start( ap, n );
- for( s = va_arg( ap, char * ); s; s = va_arg( ap, char *) )
- {
- len = strlen (s);
- if( (to_copy = __MIN(n, len) ) > 0 )
- {
- memcpy( buf, s, to_copy );
- buf += to_copy;
- n -= to_copy;
- }
- total += len;
- }
- va_end( ap );
- return total;
- }
- static int xtag_snprint( char *buf, int n, XTag *xtag )
- {
- int nn, written = 0;
- XList *l;
- XAttribute *attr;
- XTag *child;
- #define FORWARD(N)
- buf += __MIN(n, N);
- n = __MAX(n-N, 0);
- written += N;
- if( xtag == NULL )
- {
- if( n > 0 ) buf[0] = ' ';
- return 0;
- }
- if( xtag->pcdata )
- {
- nn = xtag_snprints( buf, n, xtag->pcdata, NULL );
- FORWARD( nn );
- return written;
- }
- if( xtag->name )
- {
- nn = xtag_snprints( buf, n, "<", xtag->name, NULL );
- FORWARD( nn );
- for( l = xtag->attributes; l; l = l->next )
- {
- attr = (XAttribute *)l->data;
- nn = xtag_snprints( buf, n, " ", attr->name, "="", attr->value,
- """, NULL);
- FORWARD( nn );
- }
- if( xtag->children == NULL )
- {
- nn = xtag_snprints ( buf, n, "/>", NULL );
- FORWARD( nn );
- return written;
- }
- nn = xtag_snprints( buf, n, ">", NULL );
- FORWARD( nn );
- }
- for( l = xtag->children; l; l = l->next )
- {
- child = (XTag *)l->data;
- nn = xtag_snprint( buf, n, child );
- FORWARD( nn );
- }
- if( xtag->name )
- {
- nn = xtag_snprints( buf, n, "</", xtag->name, ">", NULL );
- FORWARD( nn );
- }
- return written;
- }
- #endif