ref: db9b193ab08b9e033e80887e31ac7cca8203d906
dir: /qw/cmd.c/
// cmd.c -- Quake script command processing module
#include <u.h>
#include <libc.h>
#include <stdio.h>
#include "quakedef.h"
void Cmd_ForwardToServer (void);
#define MAX_ALIAS_NAME 32
typedef struct cmdalias_s
{
struct cmdalias_s *next;
char name[MAX_ALIAS_NAME];
char *value;
} cmdalias_t;
cmdalias_t *cmd_alias;
bool cmd_wait;
cvar_t cl_warncmd = {"cl_warncmd", "0"};
//=============================================================================
/*
============
Cmd_Wait_f
Causes execution of the remainder of the command buffer to be delayed until
next frame. This allows commands like:
bind g "impulse 5 ; +attack ; wait ; -attack ; impulse 2"
============
*/
void Cmd_Wait_f (void)
{
cmd_wait = true;
}
/*
=============================================================================
COMMAND BUFFER
=============================================================================
*/
sizebuf_t cmd_text;
byte cmd_text_buf[8192];
/*
============
Cbuf_Init
============
*/
void Cbuf_Init (void)
{
cmd_text.data = cmd_text_buf;
cmd_text.maxsize = sizeof(cmd_text_buf);
}
/*
============
Cbuf_AddText
Adds command text at the end of the buffer
============
*/
void Cbuf_AddText (char *text)
{
int l;
l = strlen (text);
if (cmd_text.cursize + l >= cmd_text.maxsize)
{
Con_Printf ("Cbuf_AddText: overflow\n");
return;
}
SZ_Write (&cmd_text, text, strlen (text));
}
/*
============
Cbuf_InsertText
Adds command text immediately after the current command
Adds a \n to the text
FIXME: actually change the command buffer to do less copying
============
*/
void Cbuf_InsertText (char *text)
{
char *temp;
int templen;
// copy off any commands still remaining in the exec buffer
templen = cmd_text.cursize;
if (templen)
{
temp = Z_Malloc (templen);
memcpy (temp, cmd_text.data, templen);
SZ_Clear (&cmd_text);
}
else
temp = NULL; // shut up compiler
// add the entire text of the file
Cbuf_AddText (text);
SZ_Write (&cmd_text, "\n", 1);
// add the copied off data
if (templen)
{
SZ_Write (&cmd_text, temp, templen);
Z_Free (temp);
}
}
/*
============
Cbuf_Execute
============
*/
void Cbuf_Execute (void)
{
int i;
char *text;
char line[1024];
int quotes;
while (cmd_text.cursize)
{
// find a \n or ; line break
text = (char *)cmd_text.data;
quotes = 0;
for (i=0 ; i< cmd_text.cursize ; i++)
{
if (text[i] == '"')
quotes++;
if ( !(quotes&1) && text[i] == ';')
break; // don't break if inside a quoted string
if (text[i] == '\n')
break;
}
memcpy (line, text, i);
line[i] = 0;
// delete the text from the command buffer and move remaining commands down
// this is necessary because commands (exec, alias) can insert data at the
// beginning of the text buffer
if (i == cmd_text.cursize)
cmd_text.cursize = 0;
else
{
i++;
cmd_text.cursize -= i;
memcpy (text, text+i, cmd_text.cursize);
}
// execute the command line
Cmd_ExecuteString (line);
if (cmd_wait)
{ // skip out while text still remains in buffer, leaving it
// for next frame
cmd_wait = false;
break;
}
}
}
/*
==============================================================================
SCRIPT COMMANDS
==============================================================================
*/
/*
===============
Cmd_StuffCmds_f
Adds command line parameters as script statements
Commands lead with a +, and continue until a - or another +
quake +prog jctest.qp +cmd amlev1
quake -nosound +cmd amlev1
===============
*/
void Cmd_StuffCmds_f (void)
{
int i, j;
int s;
char *text, *build, c;
// build the combined string to parse from
s = 0;
for (i=1 ; i<com_argc ; i++)
{
if (!com_argv[i])
continue; // NEXTSTEP nulls out -NXHost
s += strlen (com_argv[i]) + 1;
}
if (!s)
return;
text = Z_Malloc (s+1);
text[0] = 0;
for (i=1 ; i<com_argc ; i++)
{
if (!com_argv[i])
continue; // NEXTSTEP nulls out -NXHost
strcat (text,com_argv[i]);
if (i != com_argc-1)
strcat (text, " ");
}
// pull out the commands
build = Z_Malloc (s+1);
build[0] = 0;
for (i=0 ; i<s-1 ; i++)
{
if (text[i] == '+')
{
i++;
for (j=i ; (text[j] != '+') && (text[j] != '-') && (text[j] != 0) ; j++)
;
c = text[j];
text[j] = 0;
strcat (build, text+i);
strcat (build, "\n");
text[j] = c;
i = j-1;
}
}
if (build[0])
Cbuf_InsertText (build);
Z_Free (text);
Z_Free (build);
}
/*
===============
Cmd_Exec_f
===============
*/
void Cmd_Exec_f (void)
{
char *f;
int mark;
if (Cmd_Argc () != 2)
{
Con_Printf ("exec <filename> : execute a script file\n");
return;
}
// FIXME: is this safe freeing the hunk here???
mark = Hunk_LowMark ();
f = (char *)COM_LoadHunkFile (Cmd_Argv(1));
if (!f)
{
Con_Printf ("couldn't exec %s\n",Cmd_Argv(1));
return;
}
if (!Cvar_Command () && (cl_warncmd.value || developer.value))
Con_Printf ("execing %s\n",Cmd_Argv(1));
Cbuf_InsertText (f);
Hunk_FreeToLowMark (mark);
}
/*
===============
Cmd_Echo_f
Just prints the rest of the line to the console
===============
*/
void Cmd_Echo_f (void)
{
int i;
for (i=1 ; i<Cmd_Argc() ; i++)
Con_Printf ("%s ",Cmd_Argv(i));
Con_Printf ("\n");
}
/*
===============
Cmd_Alias_f
Creates a new command that executes a command string (possibly ; seperated)
===============
*/
char *CopyString (char *in)
{
char *out;
out = Z_Malloc (strlen(in)+1);
strcpy (out, in);
return out;
}
void Cmd_Alias_f (void)
{
cmdalias_t *a;
char cmd[1024];
int i, c;
char *s;
if (Cmd_Argc() == 1)
{
Con_Printf ("Current alias commands:\n");
for (a = cmd_alias ; a ; a=a->next)
Con_Printf ("%s : %s\n", a->name, a->value);
return;
}
s = Cmd_Argv(1);
if (strlen(s) >= MAX_ALIAS_NAME)
{
Con_Printf ("Alias name is too long\n");
return;
}
// if the alias allready exists, reuse it
for (a = cmd_alias ; a ; a=a->next)
{
if (!strcmp(s, a->name))
{
Z_Free (a->value);
break;
}
}
if (!a)
{
a = Z_Malloc (sizeof(cmdalias_t));
a->next = cmd_alias;
cmd_alias = a;
}
strcpy (a->name, s);
// copy the rest of the command line
cmd[0] = 0; // start out with a null string
c = Cmd_Argc();
for (i=2 ; i< c ; i++)
{
strcat (cmd, Cmd_Argv(i));
if (i != c)
strcat (cmd, " ");
}
strcat (cmd, "\n");
a->value = CopyString (cmd);
}
/*
=============================================================================
COMMAND EXECUTION
=============================================================================
*/
typedef struct cmd_function_s
{
struct cmd_function_s *next;
char *name;
xcommand_t function;
} cmd_function_t;
#define MAX_ARGS 80
static int cmd_argc;
static char *cmd_argv[MAX_ARGS];
static char *cmd_null_string = "";
static char *cmd_args = NULL;
static cmd_function_t *cmd_functions; // possible commands to execute
/*
============
Cmd_Argc
============
*/
int Cmd_Argc (void)
{
return cmd_argc;
}
/*
============
Cmd_Argv
============
*/
char *Cmd_Argv (int arg)
{
if ( arg >= cmd_argc )
return cmd_null_string;
return cmd_argv[arg];
}
/*
============
Cmd_Args
Returns a single string containing argv(1) to argv(argc()-1)
============
*/
char *Cmd_Args (void)
{
if (!cmd_args)
return "";
return cmd_args;
}
/*
============
Cmd_TokenizeString
Parses the given string into command line tokens.
============
*/
void Cmd_TokenizeString (char *text)
{
int i;
// clear the args from the last string
for (i=0 ; i<cmd_argc ; i++)
Z_Free (cmd_argv[i]);
cmd_argc = 0;
cmd_args = NULL;
while (1)
{
// skip whitespace up to a /n
while (*text && *text <= ' ' && *text != '\n')
{
text++;
}
if (*text == '\n') // a newline seperates commands in the buffer
break;
if (!*text)
return;
if (cmd_argc == 1)
cmd_args = text;
text = COM_Parse (text);
if (!text)
return;
if (cmd_argc < MAX_ARGS)
{
cmd_argv[cmd_argc] = Z_Malloc (strlen(com_token)+1);
strcpy (cmd_argv[cmd_argc], com_token);
cmd_argc++;
}
}
}
/*
============
Cmd_AddCommand
============
*/
void Cmd_AddCommand (char *cmd_name, xcommand_t function)
{
cmd_function_t *cmd;
if (host_initialized) // because hunk allocation would get stomped
Sys_Error ("Cmd_AddCommand after host_initialized");
// fail if the command is a variable name
if (Cvar_VariableString(cmd_name)[0])
{
Con_Printf ("Cmd_AddCommand: %s already defined as a var\n", cmd_name);
return;
}
// fail if the command already exists
for (cmd=cmd_functions ; cmd ; cmd=cmd->next)
{
if (!strcmp (cmd_name, cmd->name))
{
Con_Printf ("Cmd_AddCommand: %s already defined\n", cmd_name);
return;
}
}
cmd = Hunk_Alloc (sizeof(cmd_function_t));
cmd->name = cmd_name;
cmd->function = function;
cmd->next = cmd_functions;
cmd_functions = cmd;
}
/*
============
Cmd_Exists
============
*/
bool Cmd_Exists (char *cmd_name)
{
cmd_function_t *cmd;
for (cmd=cmd_functions ; cmd ; cmd=cmd->next)
{
if (!strcmp (cmd_name,cmd->name))
return true;
}
return false;
}
/*
============
Cmd_CompleteCommand
============
*/
char *Cmd_CompleteCommand (char *partial)
{
cmd_function_t *cmd;
int len;
cmdalias_t *a;
len = strlen(partial);
if (!len)
return NULL;
// check for exact match
for (cmd=cmd_functions ; cmd ; cmd=cmd->next)
if (!strcmp (partial,cmd->name))
return cmd->name;
for (a=cmd_alias ; a ; a=a->next)
if (!strcmp (partial, a->name))
return a->name;
// check for partial match
for (cmd=cmd_functions ; cmd ; cmd=cmd->next)
if (!strncmp (partial,cmd->name, len))
return cmd->name;
for (a=cmd_alias ; a ; a=a->next)
if (!strncmp (partial, a->name, len))
return a->name;
return NULL;
}
/*
===================
Cmd_ForwardToServer
adds the current command line as a clc_stringcmd to the client message.
things like godmode, noclip, etc, are commands directed to the server,
so when they are typed in at the console, they will need to be forwarded.
===================
*/
void Cmd_ForwardToServer (void)
{
if(svonly)
return;
if (cls.state == ca_disconnected)
{
Con_Printf ("Can't \"%s\", not connected\n", Cmd_Argv(0));
return;
}
if (cls.demoplayback)
return; // not really connected
MSG_WriteByte (&cls.netchan.message, clc_stringcmd);
SZ_Print (&cls.netchan.message, Cmd_Argv(0));
if (Cmd_Argc() > 1)
{
SZ_Print (&cls.netchan.message, " ");
SZ_Print (&cls.netchan.message, Cmd_Args());
}
}
// don't forward the first argument
void Cmd_ForwardToServer_f (void)
{
if (cls.state == ca_disconnected)
{
Con_Printf ("Can't \"%s\", not connected\n", Cmd_Argv(0));
return;
}
if (cistrcmp(Cmd_Argv(1), "snap") == 0) {
Cbuf_InsertText ("snap\n");
return;
}
if (cls.demoplayback)
return; // not really connected
if (Cmd_Argc() > 1)
{
MSG_WriteByte (&cls.netchan.message, clc_stringcmd);
SZ_Print (&cls.netchan.message, Cmd_Args());
}
}
/*
============
Cmd_ExecuteString
A complete command line has been parsed, so try to execute it
FIXME: lookupnoadd the token to speed search?
============
*/
void Cmd_ExecuteString (char *text)
{
cmd_function_t *cmd;
cmdalias_t *a;
Cmd_TokenizeString (text);
// execute the command line
if (!Cmd_Argc())
return; // no tokens
// check functions
for (cmd=cmd_functions ; cmd ; cmd=cmd->next)
{
if(!cistrcmp(cmd_argv[0], cmd->name))
{
if (!cmd->function)
Cmd_ForwardToServer ();
else
cmd->function ();
return;
}
}
// check alias
for (a=cmd_alias ; a ; a=a->next)
{
if (!cistrcmp (cmd_argv[0], a->name))
{
Cbuf_InsertText (a->value);
return;
}
}
// check cvars
if (!Cvar_Command () && (cl_warncmd.value || developer.value))
Con_Printf ("Unknown command \"%s\"\n", Cmd_Argv(0));
}
/*
================
Cmd_CheckParm
Returns the position (1 to argc-1) in the command's argument list
where the given parameter apears, or 0 if not present
================
*/
int Cmd_CheckParm (char *parm)
{
int i;
if (!parm)
Sys_Error ("Cmd_CheckParm: NULL");
for (i = 1; i < Cmd_Argc (); i++)
if (!cistrcmp (parm, Cmd_Argv (i)))
return i;
return 0;
}
/*
============
Cmd_Init
============
*/
void Cmd_Init (void)
{
//
// register our commands
//
Cmd_AddCommand ("stuffcmds",Cmd_StuffCmds_f);
Cmd_AddCommand ("exec",Cmd_Exec_f);
Cmd_AddCommand ("echo",Cmd_Echo_f);
Cmd_AddCommand ("alias",Cmd_Alias_f);
Cmd_AddCommand ("wait", Cmd_Wait_f);
if(!svonly)
Cmd_AddCommand ("cmd", Cmd_ForwardToServer_f);
}