research.m1stereo.tv/gitweb/ - melted/blob - src/mvcp/mvcp_response.c

   1 /*
   2  * valerie_response.c -- Response
   3  * Copyright (C) 2002-2003 Ushodaya Enterprises Limited
   4  * Author: Charles Yates <charles.yates@pandora.be>
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 /* System header files */
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <stdarg.h>
  25 #include <string.h>
  26
  27 /* Application header files */
  28 #include "valerie_response.h"
  29
  30 /** Construct a new dv response.
  31 */
  32
  33 valerie_response valerie_response_init( )
  34 {
  35         valerie_response response = malloc( sizeof( valerie_response_t ) );
  36         if ( response != NULL )
  37                 memset( response, 0, sizeof( valerie_response_t ) );
  38         return response;
  39 }
  40
  41 /** Clone a dv response
  42 */
  43
  44 valerie_response valerie_response_clone( valerie_response response )
  45 {
  46         valerie_response clone = valerie_response_init( );
  47         if ( clone != NULL && response != NULL )
  48         {
  49                 int index = 0;
  50                 for ( index = 0; index < valerie_response_count( response ); index ++ )
  51                 {
  52                         char *line = valerie_response_get_line( response, index );
  53                         valerie_response_printf( clone, strlen( line ) + 2, "%s\n", line );
  54                 }
  55         }
  56         return clone;
  57 }
  58
  59 /** Get the error code associated to the response.
  60 */
  61
  62 int valerie_response_get_error_code( valerie_response response )
  63 {
  64         int error_code = -1;
  65         if ( response != NULL )
  66         {
  67                 if ( response->count > 0 )
  68                 {
  69                         if ( sscanf( response->array[ 0 ], "%d", &error_code ) != 1 )
  70                                 error_code = 0;
  71                 }
  72                 else
  73                 {
  74                         error_code = -2;
  75                 }
  76         }
  77         return error_code;
  78 }
  79
  80 /** Get the error description associated to the response.
  81 */
  82
  83 const char *valerie_response_get_error_string( valerie_response response )
  84 {
  85         const char *error_string = "No message specified";
  86         if ( response->count > 0 )
  87         {
  88                 char *ptr = strchr( response->array[ 0 ], ' ' ) ;
  89                 if ( ptr != NULL )
  90                         error_string = ptr + 1;
  91         }
  92         return error_string;
  93 }
  94
  95 /** Get a line of text at the given index. Note that the text itself is
  96         terminated only with a NUL char and it is the responsibility of the
  97         the user of the returned data to use a LF or CR/LF as appropriate.
  98 */
  99
 100 char *valerie_response_get_line( valerie_response response, int index )
 101 {
 102         if ( index < response->count )
 103                 return response->array[ index ];
 104         else
 105                 return NULL;
 106 }
 107
 108 /** Return the number of lines of text in the response.
 109 */
 110
 111 int valerie_response_count( valerie_response response )
 112 {
 113         if ( response != NULL )
 114                 return response->count;
 115         else
 116                 return 0;
 117 }
 118
 119 /** Set the error and description associated to the response.
 120 */
 121
 122 void valerie_response_set_error( valerie_response response, int error_code, const char *error_string )
 123 {
 124         if ( response->count == 0 )
 125         {
 126                 valerie_response_printf( response, 10240, "%d %s\n", error_code, error_string );
 127         }
 128         else
 129         {
 130                 char temp[ 10240 ];
 131                 int length = sprintf( temp, "%d %s", error_code, error_string );
 132                 response->array[ 0 ] = realloc( response->array[ 0 ], length + 1 );
 133                 strcpy( response->array[ 0 ], temp );
 134         }
 135 }
 136
 137 /** Write formatted text to the response.
 138 */
 139
 140 int valerie_response_printf( valerie_response response, size_t size, const char *format, ... )
 141 {
 142         int length = 0;
 143         char *text = malloc( size );
 144         if ( text != NULL )
 145         {
 146                 va_list list;
 147                 va_start( list, format );
 148                 length = vsnprintf( text, size, format, list );
 149                 if ( length != 0 )
 150                         valerie_response_write( response, text, length );
 151                 va_end( list );
 152                 free( text );
 153         }
 154         return length;
 155 }
 156
 157 /** Write text to the reponse.
 158 */
 159
 160 int valerie_response_write( valerie_response response, const char *text, int size )
 161 {
 162         int ret = 0;
 163         const char *ptr = text;
 164
 165         while ( size > 0 )
 166         {
 167                 int index = response->count - 1;
 168                 const char *lf = strchr( ptr, '\n' );
 169                 int length_of_string = 0;
 170
 171                 /* Make sure we have space in the dynamic array. */
 172                 if ( !response->append && response->count >= response->size - 1 )
 173                 {
 174                         response->size += 50;
 175                         response->array = realloc( response->array, response->size * sizeof( char * ) );
 176                 }
 177
 178                 /* Make sure the array is valid, or we're really in trouble */
 179                 if ( response->array == NULL )
 180                 {
 181                         ret = 0;
 182                         break;
 183                 }
 184
 185                 /* Now, if we're appending to the previous write (ie: if it wasn't
 186                    terminated by a LF), then use the index calculated above, otherwise
 187                    go to the next one and ensure it's NULLed. */
 188
 189                 if ( !response->append )
 190                 {
 191                         response->array[ ++ index ] = NULL;
 192                         response->count ++;
 193                 }
 194                 else
 195                 {
 196                         length_of_string = strlen( response->array[ index ] );
 197                 }
 198
 199                 /* Now we need to know how to handle the current ptr with respect to lf. */
 200                 /* TODO: tidy up and error check... sigh... tested for many, many 1000s of lines */
 201
 202                 if ( lf == NULL )
 203                 {
 204                         response->array[ index ] = realloc( response->array[ index ], length_of_string + size + 1 );
 205                         memcpy( response->array[ index ] + length_of_string, ptr, size );
 206                         response->array[ index ][ length_of_string + size ] = '\0';
 207                         if ( ( length_of_string + size ) > 0 && response->array[ index ][ length_of_string + size - 1 ] == '\r' )
 208                                 response->array[ index ][ length_of_string + size - 1 ] = '\0';
 209                         size = 0;
 210                         ret += size;
 211                         response->append = 1;
 212                 }
 213                 else
 214                 {
 215                         int chars = lf - ptr;
 216                         response->array[ index ] = realloc( response->array[ index ], length_of_string + chars + 1 );
 217                         memcpy( response->array[ index ] + length_of_string, ptr, chars );
 218                         response->array[ index ][ length_of_string + chars ] = '\0';
 219                         if ( ( length_of_string + chars ) > 0 && response->array[ index ][ length_of_string + chars - 1 ] == '\r' )
 220                                 response->array[ index ][ length_of_string + chars - 1 ] = '\0';
 221                         ptr = ptr + chars + 1;
 222                         size -= ( chars + 1 );
 223                         response->append = 0;
 224                         ret += chars + 1;
 225                 }
 226         }
 227
 228         return ret;
 229 }
 230
 231 /** Close the response.
 232 */
 233
 234 void valerie_response_close( valerie_response response )
 235 {
 236         if ( response != NULL )
 237         {
 238                 int index = 0;
 239                 for ( index = 0; index < response->count; index ++ )
 240                         free( response->array[ index ] );
 241                 free( response->array );
 242                 free( response );
 243         }
 244 }