509 lines
8.8 KiB
C++
509 lines
8.8 KiB
C++
// cmd.c -- Quake script command processing module
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//Anything above this #include will be ignored by the compiler
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#include "../qcommon/exe_headers.h"
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#define MAX_CMD_BUFFER 16384
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#define MAX_CMD_LINE 1024
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typedef struct {
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byte *data;
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int maxsize;
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int cursize;
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} cmd_t;
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int cmd_wait;
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cmd_t cmd_text;
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byte cmd_text_buf[MAX_CMD_BUFFER];
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//=============================================================================
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/*
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============
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Cmd_Wait_f
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Causes execution of the remainder of the command buffer to be delayed until
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next frame. This allows commands like:
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bind g "cmd use rocket ; +attack ; wait ; -attack ; cmd use blaster"
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============
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*/
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void Cmd_Wait_f( void ) {
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if ( Cmd_Argc() == 2 ) {
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cmd_wait = atoi( Cmd_Argv( 1 ) );
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} else {
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cmd_wait = 1;
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}
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}
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/*
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=============================================================================
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COMMAND BUFFER
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=============================================================================
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*/
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/*
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============
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Cbuf_Init
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============
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*/
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void Cbuf_Init (void)
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{
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cmd_text.data = cmd_text_buf;
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cmd_text.maxsize = MAX_CMD_BUFFER;
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cmd_text.cursize = 0;
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}
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/*
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============
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Cbuf_AddText
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Adds command text at the end of the buffer, does NOT add a final \n
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============
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*/
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void Cbuf_AddText( const char *text ) {
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int l;
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l = strlen (text);
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if (cmd_text.cursize + l >= cmd_text.maxsize)
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{
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Com_Printf ("Cbuf_AddText: overflow\n");
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return;
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}
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Com_Memcpy(&cmd_text.data[cmd_text.cursize], text, l);
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cmd_text.cursize += l;
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}
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/*
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============
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Cbuf_InsertText
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Adds command text immediately after the current command
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Adds a \n to the text
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============
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*/
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void Cbuf_InsertText( const char *text ) {
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int len;
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int i;
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len = strlen( text ) + 1;
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if ( len + cmd_text.cursize > cmd_text.maxsize ) {
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Com_Printf( "Cbuf_InsertText overflowed\n" );
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return;
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}
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// move the existing command text
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for ( i = cmd_text.cursize - 1 ; i >= 0 ; i-- ) {
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cmd_text.data[ i + len ] = cmd_text.data[ i ];
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}
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// copy the new text in
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Com_Memcpy( cmd_text.data, text, len - 1 );
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// add a \n
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cmd_text.data[ len - 1 ] = '\n';
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cmd_text.cursize += len;
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}
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/*
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============
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Cbuf_ExecuteText
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============
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*/
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void Cbuf_ExecuteText (int exec_when, const char *text)
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{
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switch (exec_when)
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{
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case EXEC_NOW:
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if (text && strlen(text) > 0) {
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Cmd_ExecuteString (text);
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} else {
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Cbuf_Execute();
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}
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break;
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case EXEC_INSERT:
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Cbuf_InsertText (text);
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break;
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case EXEC_APPEND:
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Cbuf_AddText (text);
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break;
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default:
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Com_Error (ERR_FATAL, "Cbuf_ExecuteText: bad exec_when");
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}
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}
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/*
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============
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Cbuf_Execute
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============
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*/
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void Cbuf_Execute (void)
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{
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int i;
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char *text;
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char line[MAX_CMD_LINE];
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int quotes;
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while (cmd_text.cursize)
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{
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if ( cmd_wait ) {
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// skip out while text still remains in buffer, leaving it
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// for next frame
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cmd_wait--;
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break;
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}
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// find a \n or ; line break
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text = (char *)cmd_text.data;
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quotes = 0;
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for (i=0 ; i< cmd_text.cursize ; i++)
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{
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if (text[i] == '"')
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quotes++;
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if ( !(quotes&1) && text[i] == ';')
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break; // don't break if inside a quoted string
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if (text[i] == '\n' || text[i] == '\r' )
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break;
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}
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if( i >= (MAX_CMD_LINE - 1)) {
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i = MAX_CMD_LINE - 1;
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}
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Com_Memcpy (line, text, i);
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line[i] = 0;
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// delete the text from the command buffer and move remaining commands down
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// this is necessary because commands (exec) can insert data at the
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// beginning of the text buffer
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if (i == cmd_text.cursize)
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cmd_text.cursize = 0;
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else
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{
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i++;
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cmd_text.cursize -= i;
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memmove (text, text+i, cmd_text.cursize);
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}
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// execute the command line
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Cmd_ExecuteString (line);
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}
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}
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/*
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==============================================================================
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SCRIPT COMMANDS
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==============================================================================
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*/
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/*
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===============
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Cmd_Exec_f
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===============
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*/
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void Cmd_Exec_f( void ) {
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char *f;
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int len;
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char filename[MAX_QPATH];
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if (Cmd_Argc () != 2) {
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Com_Printf ("exec <filename> : execute a script file\n");
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return;
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}
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Q_strncpyz( filename, Cmd_Argv(1), sizeof( filename ) );
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COM_DefaultExtension( filename, sizeof( filename ), ".cfg" );
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len = FS_ReadFile( filename, (void **)&f);
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if (!f) {
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Com_Printf ("couldn't exec %s\n",Cmd_Argv(1));
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return;
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}
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Com_Printf ("execing %s\n",Cmd_Argv(1));
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Cbuf_InsertText (f);
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FS_FreeFile (f);
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}
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/*
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===============
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Cmd_Vstr_f
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Inserts the current value of a variable as command text
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===============
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*/
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void Cmd_Vstr_f( void ) {
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char *v;
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if (Cmd_Argc () != 2) {
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Com_Printf ("vstr <variablename> : execute a variable command\n");
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return;
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}
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v = Cvar_VariableString( Cmd_Argv( 1 ) );
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Cbuf_InsertText( va("%s\n", v ) );
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}
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/*
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===============
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Cmd_Echo_f
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Just prints the rest of the line to the console
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===============
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*/
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void Cmd_Echo_f (void)
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{
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int i;
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for (i=1 ; i<Cmd_Argc() ; i++)
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Com_Printf ("%s ",Cmd_Argv(i));
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Com_Printf ("\n");
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}
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/*
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=============================================================================
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COMMAND EXECUTION
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=============================================================================
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*/
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static int cmd_argc;
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static char *cmd_argv[MAX_STRING_TOKENS]; // points into cmd_tokenized
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static char cmd_tokenized[BIG_INFO_STRING+MAX_STRING_TOKENS]; // will have 0 bytes inserted
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/*
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============
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Cmd_Argc
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============
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*/
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int Cmd_Argc( void ) {
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return cmd_argc;
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}
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/*
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============
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Cmd_Argv
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============
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*/
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char *Cmd_Argv( int arg ) {
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if ( (unsigned)arg >= cmd_argc ) {
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return "";
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}
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return cmd_argv[arg];
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}
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/*
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============
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Cmd_ArgvBuffer
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The interpreted versions use this because
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they can't have pointers returned to them
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============
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*/
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void Cmd_ArgvBuffer( int arg, char *buffer, int bufferLength ) {
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Q_strncpyz( buffer, Cmd_Argv( arg ), bufferLength );
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}
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/*
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============
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Cmd_Args
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Returns a single string containing argv(1) to argv(argc()-1)
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============
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*/
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char *Cmd_Args( void ) {
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static char cmd_args[MAX_STRING_CHARS];
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int i;
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cmd_args[0] = 0;
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for ( i = 1 ; i < cmd_argc ; i++ ) {
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strcat( cmd_args, cmd_argv[i] );
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if ( i != cmd_argc-1 ) {
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strcat( cmd_args, " " );
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}
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}
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return cmd_args;
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}
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/*
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============
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Cmd_Args
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Returns a single string containing argv(arg) to argv(argc()-1)
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============
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*/
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char *Cmd_ArgsFrom( int arg ) {
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static char cmd_args[BIG_INFO_STRING];
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int i;
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cmd_args[0] = 0;
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if (arg < 0)
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arg = 0;
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for ( i = arg ; i < cmd_argc ; i++ ) {
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strcat( cmd_args, cmd_argv[i] );
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if ( i != cmd_argc-1 ) {
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strcat( cmd_args, " " );
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}
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}
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return cmd_args;
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}
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/*
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============
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Cmd_ArgsBuffer
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The interpreted versions use this because
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they can't have pointers returned to them
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============
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*/
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void Cmd_ArgsBuffer( char *buffer, int bufferLength ) {
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Q_strncpyz( buffer, Cmd_Args(), bufferLength );
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}
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/*
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============
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Cmd_TokenizeString
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Parses the given string into command line tokens.
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The text is copied to a seperate buffer and 0 characters
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are inserted in the apropriate place, The argv array
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will point into this temporary buffer.
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============
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*/
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void Cmd_TokenizeString( const char *text_in ) {
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const char *text;
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char *textOut;
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// clear previous args
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cmd_argc = 0;
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if ( !text_in ) {
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return;
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}
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text = text_in;
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textOut = cmd_tokenized;
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while ( 1 ) {
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if ( cmd_argc == MAX_STRING_TOKENS ) {
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return; // this is usually something malicious
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}
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while ( 1 ) {
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// skip whitespace
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while ( *text && *text <= ' ' ) {
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text++;
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}
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if ( !*text ) {
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return; // all tokens parsed
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}
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// skip // comments
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if ( text[0] == '/' && text[1] == '/' ) {
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return; // all tokens parsed
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}
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// skip /* */ comments
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if ( text[0] == '/' && text[1] =='*' ) {
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while ( *text && ( text[0] != '*' || text[1] != '/' ) ) {
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text++;
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}
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if ( !*text ) {
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return; // all tokens parsed
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}
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text += 2;
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} else {
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break; // we are ready to parse a token
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}
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}
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// handle quoted strings
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if ( *text == '"' ) {
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cmd_argv[cmd_argc] = textOut;
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cmd_argc++;
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text++;
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while ( *text && *text != '"' ) {
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*textOut++ = *text++;
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}
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*textOut++ = 0;
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if ( !*text ) {
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return; // all tokens parsed
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}
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text++;
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continue;
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}
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// regular token
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cmd_argv[cmd_argc] = textOut;
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cmd_argc++;
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// skip until whitespace, quote, or command
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while ( *(const unsigned char* /*eurofix*/)text > ' ' )
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{
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if ( text[0] == '"' ) {
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break;
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}
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if ( text[0] == '/' && text[1] == '/' ) {
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break;
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}
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// skip /* */ comments
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if ( text[0] == '/' && text[1] =='*' ) {
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break;
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}
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*textOut++ = *text++;
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}
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*textOut++ = 0;
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if ( !*text ) {
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return; // all tokens parsed
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}
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}
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}
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/*
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============
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Cmd_Init
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============
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*/
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extern void Cmd_List_f(void);
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void Cmd_Init (void) {
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Cmd_AddCommand ("cmdlist",Cmd_List_f);
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Cmd_AddCommand ("exec",Cmd_Exec_f);
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Cmd_AddCommand ("vstr",Cmd_Vstr_f);
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Cmd_AddCommand ("echo",Cmd_Echo_f);
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Cmd_AddCommand ("wait", Cmd_Wait_f);
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}
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