source: help.c @ 4772500

  /********************************************************************\
  * BitlBee -- An IRC to other IM-networks gateway                     *
  *                                                                    *
  * Copyright 2002-2009 Wilmer van der Gaast and others                *
  \********************************************************************/

/* Help file control                                                    */

/*
  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 with
  the Debian GNU/Linux distribution in /usr/share/common-licenses/GPL;
  if not, write to the Free Software Foundation, Inc., 59 Temple Place,
  Suite 330, Boston, MA  02111-1307  USA
*/

#define BITLBEE_CORE
#include "bitlbee.h"
#undef read 
#undef write

#define BUFSIZE 1100

help_t *help_init( help_t **help, const char *helpfile )
{
        int i, buflen = 0;
        help_t *h;
        char *s, *t;
        time_t mtime;
        struct stat stat[1];
        
        *help = h = g_new0 ( help_t, 1 );
        
        h->fd = open( helpfile, O_RDONLY
#ifdef _WIN32
                                  | O_BINARY
#endif
                                  );
        
        if( h->fd == -1 )
        {
                g_free( h );
                return( *help = NULL );
        }
        
        if( fstat( h->fd, stat ) != 0 )
        {
                g_free( h );
                return( *help = NULL );
        }
        mtime = stat->st_mtime;
        
        s = g_new (char, BUFSIZE + 1 );
        s[BUFSIZE] = 0;
        
        while( ( ( i = read( h->fd, s + buflen, BUFSIZE - buflen ) ) > 0 ) ||
               ( i == 0 && strstr( s, "\n%\n" ) ) )
        {
                buflen += i;
                memset( s + buflen, 0, BUFSIZE - buflen );
                if( !( t = strstr( s, "\n%\n" ) ) || s[0] != '?' )
                {
                        /* FIXME: Clean up */
                        help_free( help );
                        g_free( s );
                        return NULL;
                }
                i = strchr( s, '\n' ) - s;
                
                if( h->title )
                {
                        h = h->next = g_new0( help_t, 1 );
                }
                h->title = g_new ( char, i );
                
                strncpy( h->title, s + 1, i - 1 );
                h->title[i-1] = 0;
                h->fd = (*help)->fd;
                h->offset.file_offset = lseek( h->fd, 0, SEEK_CUR ) - buflen + i + 1;
                h->length = t - s - i - 1;
                h->mtime = mtime;
                
                buflen -= ( t + 3 - s );
                t = g_strdup( t + 3 );
                g_free( s );
                s = g_renew( char, t, BUFSIZE + 1 );
                s[BUFSIZE] = 0;
        }
        
        g_free( s );
        
        return( *help );
}

void help_free( help_t **help )
{
        help_t *h, *oh;
        int last_fd = -1; /* Weak de-dupe */
        
        if( help == NULL || *help == NULL )
                return;
        
        h = *help;
        while( h )
        {
                if( h->fd != last_fd )
                {
                        close( h->fd );
                        last_fd = h->fd;
                }
                g_free( h->title );
                h = (oh=h)->next;
                g_free( oh );
        }
        
        *help = NULL;
}

char *help_get( help_t **help, char *title )
{
        time_t mtime;
        struct stat stat[1];
        help_t *h;

        for( h = *help; h; h = h->next )
        {
                if( h->title != NULL && g_strcasecmp( h->title, title ) == 0 )
                        break;
        }
        if( h && h->length > 0 )
        {
                char *s = g_new( char, h->length + 1 );
                
                s[h->length] = 0;
                if( h->fd >= 0 )
                {
                        if( fstat( h->fd, stat ) != 0 )
                        {
                                g_free( s );
                                return NULL;
                        }
                        mtime = stat->st_mtime;
                
                        if( mtime > h->mtime )
                        {
                                g_free( s );
                                return NULL;
                        }
                        
                        lseek( h->fd, h->offset.file_offset, SEEK_SET );
                        read( h->fd, s, h->length );
                }
                else
                {
                        strncpy( s, h->offset.mem_offset, h->length );
                }
                return s;
        }
        
        return NULL;
}

int help_add_mem( help_t **help, const char *title, const char *content )
{
        help_t *h, *l = NULL;
        
        for( h = *help; h; h = h->next )
        {
                if( g_strcasecmp( h->title, title ) == 0 )
                        return 0;
                
                l = h;
        }
        
        if( l )
                h = l->next = g_new0( struct help, 1 );
        else
                *help = h = g_new0( struct help, 1 );
        h->fd = -1;
        h->title = g_strdup( title );
        h->length = strlen( content );
        h->offset.mem_offset = g_strdup( content );
        
        return 1;
}