ref: f17137ef1990270b3f6b46845e8c8ec80644f288
dir: /cmd.c/
#include <u.h>
#include <libc.h>
#include <stdio.h>
#include "dat.h"
#include "fns.h"
/* Command text buffering and command execution
*
* Any number of commands can be added in a frame, from several different
* sources. Most commands come from either keybindings or console line input,
* but remote servers can also send across commands and entire text files can
* be execed. The '+' command line options are also added to the command buffer.
* The game starts with a Cbuf_AddText("exec quake.rc\n"); Cbuf_Execute();.
* Command execution takes a null terminated string, breaks it into tokens,
* then searches for a command or variable that matches the first token. */
typedef struct cmdalias_t cmdalias_t;
typedef struct cmd_function_t cmd_function_t;
enum{
MAX_ALIAS_NAME = 32,
ALIAS_LOOP_COUNT = 16
};
struct cmdalias_t{
cmdalias_t *next;
char name[MAX_ALIAS_NAME];
char *value;
};
cmdalias_t *cmd_alias;
int alias_count; // for detecting runaway loops
qboolean cmd_wait;
sizebuf_t cmd_text;
uchar cmd_text_buf[8192];
uchar defer_text_buf[8192];
static int cmd_argc;
static char *cmd_argv[MAX_STRING_TOKENS];
static char *cmd_null_string = "";
static char cmd_args[MAX_STRING_CHARS];
struct cmd_function_t{
cmd_function_t *next;
char *name;
xcommand_t function;
};
static cmd_function_t *cmd_functions; // possible commands to execute
/* 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;
}
/* allocates an initial text buffer that will grow as needed */
void
Cbuf_Init(void)
{
SZ_Init(&cmd_text, cmd_text_buf, sizeof cmd_text_buf);
}
/* 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){
Com_Printf("Cbuf_AddText: overflow\n");
return;
}
SZ_Write(&cmd_text, text, l);
}
// FIXME: actually change the command buffer to do less copying
/* Adds command text immediately after the current command and '\n' to the text */
void
Cbuf_InsertText(char *text)
{
char *temp = nil;
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);
}
Cbuf_AddText(text);
if(templen){
SZ_Write(&cmd_text, temp, templen);
Z_Free(temp);
}
}
void
Cbuf_CopyToDefer(void)
{
memcpy(defer_text_buf, cmd_text_buf, cmd_text.cursize);
defer_text_buf[cmd_text.cursize] = 0;
cmd_text.cursize = 0;
}
void
Cbuf_InsertFromDefer(void)
{
Cbuf_InsertText((char *)defer_text_buf);
defer_text_buf[0] = 0;
}
void
Cbuf_ExecuteText(int exec_when, char *text)
{
switch(exec_when){
case EXEC_NOW:
Cmd_ExecuteString(text);
break;
case EXEC_INSERT:
Cbuf_InsertText(text);
break;
case EXEC_APPEND:
Cbuf_AddText(text);
break;
default:
Com_Error(ERR_FATAL, "Cbuf_ExecuteText: bad exec_when");
}
}
/* normally called once per frame, but may be explicitly invoked.
* do not call inside a command function! */
void
Cbuf_Execute(void)
{
int i, quotes;
char *text, line[1024];
alias_count = 0; // don't allow infinite alias loops
while(cmd_text.cursize){
text = (char *)cmd_text.data;
/* find a \n or ; line break */
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;
memmove(text, text+i, cmd_text.cursize);
}
Cmd_ExecuteString(line);
/* skip out while text still remains in buffer, leaving it for
* next frame */
if(cmd_wait){
cmd_wait = false;
break;
}
}
}
/* Adds command line parameters as script statements. Commands lead with a '+',
* and continue until another '+'. Set commands are added early, so they are
* guaranteed to be set before the client and server initialize for the first
* time. Other commands are added late, after all initialization is complete. */
void
Cbuf_AddEarlyCommands(qboolean clear)
{
int i;
char *s;
for(i=0; i<COM_Argc(); i++){
s = COM_Argv(i);
if(strcmp(s, "+set"))
continue;
Cbuf_AddText(va("set %s %s\n", COM_Argv(i+1), COM_Argv(i+2)));
if(clear){
COM_ClearArgv(i);
COM_ClearArgv(i+1);
COM_ClearArgv(i+2);
}
i += 2;
}
}
/* Adds command line parameters as script statements. Commands lead with a '+'
* and continue until another '+' or '-'. Returns true if any late commands
* were added, which will keep the demoloop from immediately starting. */
qboolean
Cbuf_AddLateCommands(void)
{
int i, j, s, argc;
char *text, *build, c;
qboolean ret;
/* build the combined string to parse from */
s = 0;
argc = COM_Argc();
for(i=1; i<argc; i++)
s += strlen(COM_Argv(i)) + 1;
if(!s)
return false;
text = Z_Malloc(s+1);
text[0] = 0;
for(i=1; i<argc; i++){
strcat(text, COM_Argv(i));
if(i != 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;
}
ret = build[0] != 0;
if(ret)
Cbuf_AddText(build);
Z_Free(text);
Z_Free(build);
return ret;
}
void
Cmd_Exec_f(void)
{
char *f, *f2;
int len;
if(Cmd_Argc() != 2){
Com_Printf("exec <filename> : execute a script file\n");
return;
}
len = FS_LoadFile(Cmd_Argv(1), (void **)&f);
if(!f){
Com_Printf("couldn't exec %s\n", Cmd_Argv(1));
return;
}
Com_Printf("execing %s\n", Cmd_Argv(1));
/* the file doesn't have a trailing 0, so we need to copy it off */
f2 = Z_Malloc(len+1);
memcpy(f2, f, len);
f2[len] = 0;
Cbuf_InsertText(f2);
Z_Free(f2);
FS_FreeFile(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++)
Com_Printf("%s ", Cmd_Argv(i));
Com_Printf("\n");
}
/* Creates a new command that executes a command string (possibly ; seperated) */
void
Cmd_Alias_f(void)
{
int i, c;
char cmd[1024], *s;
cmdalias_t *p;
if(Cmd_Argc() == 1){
Com_Printf("Current alias commands:\n");
for(p = cmd_alias; p != nil; p = p->next)
Com_Printf("%s : %s\n", p->name, p->value);
return;
}
s = Cmd_Argv(1);
if(strlen(s) >= MAX_ALIAS_NAME){
Com_Printf("Alias name is too long\n");
return;
}
/* if the alias already exists, reuse it */
for(p = cmd_alias; p != nil; p = p->next)
if(!strcmp(s, p->name)){
Z_Free(p->value);
break;
}
if(p == nil){
p = Z_Malloc(sizeof *p);
p->next = cmd_alias;
cmd_alias = p;
}
strcpy(p->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-1)
strcat(cmd, " ");
}
strcat(cmd, "\n");
p->value = CopyString(cmd);
}
int
Cmd_Argc(void)
{
return cmd_argc;
}
char *
Cmd_Argv(int arg)
{
if((unsigned)arg >= cmd_argc)
return cmd_null_string;
return cmd_argv[arg];
}
/* returns a single string containing argv(1) to argv(argc()-1) */
char *
Cmd_Args(void)
{
return cmd_args;
}
char *
Cmd_MacroExpandString(char *text)
{
int i, j, count, len;
qboolean inquote;
char *scan, *token, *start;
char temporary[MAX_STRING_CHARS];
static char expanded[MAX_STRING_CHARS];
inquote = false;
scan = text;
len = strlen (scan);
if(len >= MAX_STRING_CHARS){
Com_Printf("Line exceeded %d chars, discarded.\n", MAX_STRING_CHARS);
return nil;
}
count = 0;
for(i=0; i<len ; i++){
if(scan[i] == '"')
inquote ^= 1;
if(inquote)
continue; // don't expand inside quotes
if(scan[i] != '$')
continue;
/* scan out the complete macro */
start = scan+i+1;
token = COM_Parse(&start);
if(!start)
continue;
token = Cvar_VariableString(token);
j = strlen(token);
len += j;
if(len >= MAX_STRING_CHARS){
Com_Printf("Expanded line exceeded %d chars, discarded.\n", MAX_STRING_CHARS);
return nil;
}
strncpy(temporary, scan, i);
strcpy(temporary+i, token);
strcpy(temporary+i+j, start);
strcpy(expanded, temporary);
scan = expanded;
i--;
if(++count == 100){
Com_Printf("Macro expansion loop, discarded.\n");
return nil;
}
}
if(inquote){
Com_Printf("Line has unmatched quote, discarded.\n");
return nil;
}
return scan;
}
/* Parses the given string into command line tokens. $Cvars will be expanded
* unless they are in a quoted token */
void
Cmd_TokenizeString(char *text, qboolean macroExpand)
{
int i, l;
char *com_token;
/* clear the args from the last string */
for(i=0; i<cmd_argc; i++)
Z_Free(cmd_argv[i]);
cmd_argc = 0;
cmd_args[0] = 0;
/* macro expand the text */
if(macroExpand)
text = Cmd_MacroExpandString(text);
if(text == nil)
return;
for(;;){
while(*text && *text <= ' ' && *text != '\n')
text++;
/* a newline separates commands in the buffer */
if(*text == '\n'){
text++;
break;
}
if(!*text)
return;
// set cmd_args to everything after the first arg
if(cmd_argc == 1){
strcpy(cmd_args, text);
/* strip off any trailing whitespace */
for(l = strlen(cmd_args) - 1; l >= 0 ; l--)
if(cmd_args[l] <= ' ')
cmd_args[l] = 0;
else
break;
}
com_token = COM_Parse(&text);
if(text == nil)
return;
if(cmd_argc < MAX_STRING_TOKENS){
cmd_argv[cmd_argc] = Z_Malloc(strlen(com_token)+1);
strcpy(cmd_argv[cmd_argc], com_token);
cmd_argc++;
}
}
}
/* called by the init functions of other parts of the program to register
* commands and functions to call for them. rhe cmd_name is referenced later,
* so it should not be in temp memory if function is nil, the command will be
* forwarded to the server as a clc_stringcmd instead of executed locally */
void
Cmd_AddCommand(char *name, xcommand_t function)
{
cmd_function_t *p;
/* fail if the command is a variable name */
if(Cvar_VariableString(name)[0]){
Com_Printf("Cmd_AddCommand: %s already defined as a var\n", name);
return;
}
/* fail if the command already exists */
for(p = cmd_functions; p != nil; p = p->next)
if(!strcmp(name, p->name)){
Com_Printf("Cmd_AddCommand: %s already defined\n", name);
return;
}
p = Z_Malloc(sizeof *p);
p->name = name;
p->function = function;
p->next = cmd_functions;
cmd_functions = p;
}
void
Cmd_RemoveCommand(char *name)
{
cmd_function_t *p, **back;
back = &cmd_functions;
for(;;){
p = *back;
if(p == nil){
Com_Printf("Cmd_RemoveCommand: %s not added\n", name);
return;
}
if(!strcmp(name, p->name)){
*back = p->next;
Z_Free(p);
return;
}
back = &p->next;
}
}
/* used by the cvar code to check for cvar / command name overlap */
qboolean
Cmd_Exists(char *name)
{
cmd_function_t *p;
for(p = cmd_functions; p != nil; p = p->next)
if(!strcmp(name, p->name))
return true;
return false;
}
/* attempts to match a partial command for automatic command line completion */
char *
Cmd_CompleteCommand(char *partial)
{
cmd_function_t *p;
int len;
cmdalias_t *a;
len = strlen(partial);
if(!len)
return nil;
/* check for exact match */
for(p = cmd_functions; p != nil; p = p->next)
if(!strcmp(partial, p->name))
return p->name;
for(a = cmd_alias; a != nil; a = a->next)
if(!strcmp(partial, a->name))
return a->name;
/* check for partial match */
for(p = cmd_functions; p != nil; p = p->next)
if(!strncmp(partial, p->name, len))
return p->name;
for(a = cmd_alias; a != nil; a = a->next)
if(!strncmp(partial, a->name, len))
return a->name;
return nil;
}
// FIXME: lookupnoadd the token to speed search?
/* Parses a single line of text into arguments and tries to execute it as if it
* was typed at the console */
void
Cmd_ExecuteString(char *text)
{
cmd_function_t *p;
cmdalias_t *a;
Cmd_TokenizeString(text, true);
if(!Cmd_Argc())
return; // no tokens
/* check functions */
for(p = cmd_functions; p != nil; p = p->next)
if(!cistrcmp(cmd_argv[0], p->name)){
if(!p->function) // forward to server command
Cmd_ExecuteString(va("cmd %s", text));
else
p->function();
return;
}
/* check alias */
for(a = cmd_alias; a != nil; a = a->next)
if(!cistrcmp(cmd_argv[0], a->name)){
if(++alias_count == ALIAS_LOOP_COUNT){
Com_Printf("ALIAS_LOOP_COUNT\n");
return;
}
Cbuf_InsertText(a->value);
return;
}
/* check cvars */
if(Cvar_Command())
return;
/* send it as a server command if we are connected */
Cmd_ForwardToServer();
}
void
Cmd_List_f(void)
{
cmd_function_t *p;
int i;
for(p = cmd_functions, i = 0; p != nil; p = p->next, i++)
Com_Printf("%s\n", p->name);
Com_Printf("%d commands\n", i);
}
void
Cmd_Init(void)
{
Cmd_AddCommand("cmdlist", Cmd_List_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);
}