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quakeforge/libs/util/cmd.c
Brian Koropoff 93c9f96416 Added embedded commands with ~{} and the return command, created a token 
structure to help tidy the command buffer struct up a bit, fixed a few
bugs and probably created 100 more.  A lot of things were changed to
allow embedded commands:
- Old buffers on the stack are left alone for Cbuf_ExecuteStack to
clean up.  This is so return values can be extracted from them.
- The imperative flag has been added.  An imperative buffer and all buffers
following it can not be paused with the wait command.
- The returning flag and retval dstring have been added.  If a buffer
returned something, the flag will be set.
- The return command was added so there was something to use in the
substitution.  Return nukes all loop buffers since they don't really count
as independent functions, sets the return value on the top buffer, and
clears it.
- Who knows what else.
2002-03-29 07:43:02 +00:00

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/*
cmd.c
script command processing module
Copyright (C) 1996-1997 Id Software, Inc.
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
along with this program; if not, write to:
Free Software Foundation, Inc.
59 Temple Place - Suite 330
Boston, MA 02111-1307, USA
*/
static const char rcsid[] =
"$Id$";
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#ifdef HAVE_STRING_H
# include <string.h>
#endif
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif
#include <ctype.h>
#include "QF/cmd.h"
#include "QF/cvar.h"
#include "QF/hash.h"
#include "QF/qargs.h"
#include "QF/qendian.h"
#include "QF/sizebuf.h"
#include "QF/sys.h"
#include "QF/vfs.h"
#include "QF/zone.h"
#include "compat.h"
#include "QF/dstring.h"
#include "QF/exp.h"
#include "QF/va.h"
typedef struct cmdalias_s {
struct cmdalias_s *next;
const char *name;
const char *value;
} cmdalias_t;
cmdalias_t *cmd_alias;
cmd_source_t cmd_source;
/* FIXME: All these separate buffers are sort of hacky
The command buffer interface should be generalized and
each part of QF (console, stufftext, config files and scripts)
that needs one should allocate and maintain its own.
*/
cmd_buffer_t *cmd_consolebuffer; // Console buffer
cmd_buffer_t *cmd_legacybuffer; // Server stuffcmd buffer with
// absolute backwards-compatibility
cmd_buffer_t *cmd_activebuffer; // Buffer currently being executed
cmd_buffer_t *cmd_recycled; // Recycled buffers
dstring_t *cmd_backtrace;
qboolean cmd_error;
cvar_t *cmd_warncmd;
cvar_t *cmd_maxloop;
hashtab_t *cmd_alias_hash;
hashtab_t *cmd_hash;
//=============================================================================
/* Local variable stuff */
cmd_localvar_t *
Cmd_NewLocal (const char *key, const char *value)
{
cmd_localvar_t *new;
dstring_t *dkey, *dvalue;
new = malloc (sizeof (cmd_localvar_t));
if (!new)
Sys_Error ("Cmd_NewLocal: Memory allocation failed!");
dkey = dstring_newstr ();
dvalue = dstring_newstr ();
dstring_appendstr (dkey, key);
dstring_appendstr (dvalue, value);
new->key = dkey;
new->value = dvalue;
return new;
}
void
Cmd_SetLocal (cmd_buffer_t *buffer, const char *key, const char *value)
{
cmd_localvar_t *var;
var = (cmd_localvar_t *)Hash_Find(buffer->locals, key);
if (!var) {
var = Cmd_NewLocal (key, value);
Hash_Add (buffer->locals, (void *) var);
} else {
dstring_clearstr (var->value);
dstring_appendstr (var->value, value);
}
}
const char *
Cmd_LocalGetKey (void *ele, void *ptr)
{
return ((cmd_localvar_t *) ele)->key->str;
}
void
Cmd_LocalFree (void *ele, void *ptr)
{
dstring_delete (((cmd_localvar_t *) ele)->key);
dstring_delete (((cmd_localvar_t *) ele)->value);
free (ele);
}
/* Token management stuff */
cmd_token_t *
Cmd_NewToken (void) {
cmd_token_t *new;
new = calloc(1,sizeof(cmd_token_t));
SYS_CHECKMEM (new);
new->original = dstring_newstr();
new->processed = dstring_newstr();
return new;
}
/* Command buffer management */
cmd_buffer_t *
Cmd_NewBuffer (qboolean ownvars)
{
cmd_buffer_t *new;
if (cmd_recycled) { // If we have old buffers lying around
new = cmd_recycled;
cmd_recycled = new->next;
}
else {
new = calloc (1, sizeof (cmd_buffer_t));
new->buffer = dstring_newstr ();
new->line = dstring_newstr ();
new->realline = dstring_newstr ();
new->looptext = dstring_newstr ();
new->retval = dstring_newstr ();
}
if (ownvars)
new->locals = Hash_NewTable (512, Cmd_LocalGetKey, Cmd_LocalFree, 0);
new->ownvars = ownvars;
new->prev = new->next = 0;
return new;
}
/*
Cmd_FreeBuffer
Actually just "recycles" buffer for
later use
*/
void
Cmd_FreeBuffer (cmd_buffer_t *free) {
if (free->ownvars)
Hash_DelTable(free->locals); // Local variables are always deadbeef
free->wait = free->loop = free->ownvars = free->legacy = free->returning = free->imperative = false;
dstring_clearstr (free->buffer);
dstring_clearstr (free->line);
dstring_clearstr (free->realline);
dstring_clearstr (free->looptext);
dstring_clearstr (free->retval);
free->locals = 0;
free->next = cmd_recycled;
cmd_recycled = free;
}
void
Cmd_FreeStack (cmd_buffer_t *stack) {
cmd_buffer_t *temp;
for (;stack; stack = temp) {
temp = stack->next;
Cmd_FreeBuffer (stack);
}
}
/*void
Cmd_FreeBuffer (cmd_buffer_t *del)
{
int i;
dstring_delete (del->buffer);
dstring_delete (del->line);
dstring_delete (del->realline);
dstring_delete (del->looptext);
if (del->maxargc) {
for (i = 0; i < del->maxargc; i++) {
if (del->argv[i])
dstring_delete (del->argv[i]);
if (del->argu[i])
dstring_delete (del->argu[i]);
}
free (del->argv);
free (del->argu);
}
if (del->args)
free(del->args);
if (del->ownvars)
Hash_DelTable(del->locals);
free(del);
}*/
/* Quick function to determine if a character is escaped */
qboolean
escaped (const char *str, int i)
{
int n, c;
if (!i)
return 0;
for (n = i - 1, c = 0; n >= 0 && str[n] == '\\'; n--, c++)
;
return c & 1;
}
/* Quick function to escape stuff in a dstring */
void
escape (dstring_t * dstr)
{
int i;
for (i = 0; i < strlen (dstr->str); i++) {
switch (dstr->str[i]) {
case '\\':
case '$':
case '#':
case '{':
case '}':
case '\"':
case '\'':
case '<':
case '>':
dstring_insertstr (dstr, "\\", i);
i++;
break;
}
}
}
/*
Cmd_Wait_f
Causes execution of the remainder of the
command buffer and stack 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_buffer_t *cur;
if (!cmd_activebuffer->imperative)
for (cur = cmd_activebuffer; cur; cur = cur->prev)
cur->wait = true;
}
void
Cmd_Error (const char *message)
{
cmd_buffer_t *cur;
Sys_Printf ("GIB: Error in execution. "
"Type backtrace for a description and execution path to "
"the error\n");
cmd_error = true;
dstring_clearstr (cmd_backtrace);
dstring_appendstr (cmd_backtrace, message);
dstring_appendstr (cmd_backtrace, "Path of execution:\n");
for (cur = cmd_activebuffer; cur; cur = cur->prev) {
dstring_appendstr (cmd_backtrace, va ("--> %s\n", cur->realline->str));
}
}
/*
COMMAND BUFFER
*/
void
Cbuf_Init (void)
{
cmd_consolebuffer = Cmd_NewBuffer (true);
cmd_legacybuffer = Cmd_NewBuffer (true);
cmd_legacybuffer->legacy = true;
cmd_activebuffer = cmd_consolebuffer;
cmd_recycled = 0;
cmd_backtrace = dstring_newstr ();
}
void
Cbuf_AddTextTo (cmd_buffer_t *buffer, const char *text)
{
dstring_appendstr (buffer->buffer, text);
}
/*
Cbuf_AddText
Add text to the active buffer
*/
void
Cbuf_AddText (const char *text)
{
Cbuf_AddTextTo (cmd_activebuffer, text);
}
void
Cbuf_InsertTextTo (cmd_buffer_t *buffer, const char *text)
{
dstring_insertstr (buffer->buffer, "\n", 0);
dstring_insertstr (buffer->buffer, text, 0);
}
/* Cbuf_InsertText
Add text to the beginning of the active buffer
*/
void
Cbuf_InsertText (const char *text)
{
Cbuf_InsertTextTo (cmd_activebuffer, text);
}
/*
Cbuf_ExtractLine
Finds the next \n,\r, or ;-delimeted
line in the command buffer and copies
it into a buffer. Also shifts the rest
of the command buffer back to the start.
*/
void
Cbuf_ExtractLine (dstring_t * buffer, dstring_t * line, qboolean legacy)
{
int i, squotes = 0, dquotes = 0, braces = 0, n;
char *tmp;
for (i = 0; buffer->str[i]; i++) {
if (!legacy && buffer->str[i] == '\'' && !escaped (buffer->str, i)
&& !dquotes)
squotes ^= 1;
if (buffer->str[i] == '"' && !escaped (buffer->str, i)
&& !squotes)
dquotes ^= 1;
if (buffer->str[i] == ';' && !escaped (buffer->str, i)
&& !squotes && !dquotes && !braces)
break;
if (!legacy && buffer->str[i] == '{' && !escaped (buffer->str, i)
&& !squotes && !dquotes)
braces++;
if (!legacy && buffer->str[i] == '}' && !escaped (buffer->str, i)
&& !squotes && !dquotes)
braces--;
if (buffer->str[i] == '/' && buffer->str[i + 1] == '/'
&& !squotes && !dquotes) {
// Filter out comments until newline
if ((tmp = strchr (buffer->str+i, '\n')))
n = tmp - (buffer->str+i);
else if ((tmp = strchr (buffer->str+i, '\r')))
n = tmp - (buffer->str+i);
else
n = strlen(buffer->str+i); // snip till \0
dstring_snip (buffer, i, n);
}
if (buffer->str[i] == '\n' || buffer->str[i] == '\r') {
if (braces) {
dstring_snip (buffer, i, 1);
i--;
} else
break;
}
}
if (i)
dstring_insert (line, buffer->str, i, 0);
if (buffer->str[i]) {
dstring_snip (buffer, 0, i + 1);
} else {
// We've hit the end of the buffer, just clear it
dstring_clearstr (buffer);
}
}
/*
Cbuf_ExecuteBuffer
Extracts and executes each line in the
command buffer, until it is empty or
a wait command is executed
*/
void
Cbuf_ExecuteBuffer (cmd_buffer_t *buffer)
{
dstring_t *buf = dstring_newstr ();
cmd_buffer_t *temp = cmd_activebuffer; // save old context
cmd_activebuffer = buffer;
buffer->wait = false;
while (1) {
if (!strlen(buffer->buffer->str)) {
if (buffer->loop) {
if (cmd_maxloop->value && buffer->loop > cmd_maxloop->value) {
Cmd_Error(va("GIB: Loop lasted longer than %i iterations, forcefully terminating.\n",
(int)cmd_maxloop->value));
break;
}
Cbuf_InsertTextTo(buffer, buffer->looptext->str);
buffer->loop++;
}
else
break;
}
Cbuf_ExtractLine (buffer->buffer, buf, buffer->legacy);
Cmd_ExecuteString (buf->str, src_command);
if (buffer->wait)
break;
if (cmd_error)
break;
dstring_clearstr (buf);
}
dstring_delete (buf);
cmd_activebuffer = temp; // restore old context
}
void
Cbuf_ExecuteStack (cmd_buffer_t *buffer)
{
qboolean wait = false;
cmd_buffer_t *cur, *temp;
cmd_error = false;
for (cur = buffer; cur->next; cur = cur->next);
for (; cur != buffer; cur = temp) {
temp = cur->prev;
Cbuf_ExecuteBuffer (cur);
if (cur->wait) {
wait = true;
break;
} else if (cmd_error)
break;
else {
cur->prev->next = 0;
Cmd_FreeBuffer (cur);
}
}
if (!wait)
Cbuf_ExecuteBuffer (buffer);
if (cmd_error) {
// If an error occured, nuke the entire stack
Cmd_FreeStack (buffer->next);
buffer->next = 0;
dstring_clearstr (buffer->buffer); // And the root buffer
}
}
/*
Cbuf_Execute
Executes both root buffers
*/
void
Cbuf_Execute (void)
{
Cbuf_ExecuteStack (cmd_consolebuffer);
Cbuf_ExecuteStack (cmd_legacybuffer);
}
/*
Cmd_ExecuteSubroutine
Executes a buffer as a subroutine on
top of the execution stack. Execute
a buffer this way and forget about it,
it will be handled properly.
*/
void
Cmd_ExecuteSubroutine (cmd_buffer_t *buffer)
{
// Inherit some flags from the current buffer
buffer->imperative = cmd_activebuffer->imperative;
cmd_activebuffer->next = buffer;
buffer->prev = cmd_activebuffer;
Cbuf_ExecuteBuffer (buffer);
/* if (!buffer->wait) {
Cmd_FreeBuffer (buffer);
cmd_activebuffer->next = 0;
}*/
return;
}
/*
Cbuf_Execute_Sets
Similar to Cbuf_Execute, but only
executes set and setrom commands,
and only in the console buffer.
Used for reading config files
before the cmd subsystem is
entirely loaded.
*/
void
Cbuf_Execute_Sets (void)
{
dstring_t *buf = dstring_newstr ();
while (strlen (cmd_consolebuffer->buffer->str)) {
Cbuf_ExtractLine (cmd_consolebuffer->buffer, buf, cmd_consolebuffer->legacy);
if (!strncmp (buf->str, "set", 3) && isspace ((int) buf->str[3])) {
Cmd_ExecuteString (buf->str, src_command);
} else if (!strncmp (buf->str, "setrom", 6)
&& isspace ((int) buf->str[6])) {
Cmd_ExecuteString (buf->str, src_command);
}
dstring_clearstr (buf);
}
dstring_delete (buf);
}
/*
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 *build, c;
s = strlen (com_cmdline);
if (!s)
return;
// pull out the commands
build = malloc (s + 1);
if (!build)
Sys_Error ("Cmd_StuffCmds_f: Memory Allocation Failure\n");
build[0] = 0;
for (i = 0; i < s - 1; i++) {
if (com_cmdline[i] == '+') {
i++;
for (j = i; !((com_cmdline[j] == '+')
|| (com_cmdline[j] == '-'
&& (j == 0 || com_cmdline[j - 1] == ' '))
|| (com_cmdline[j] == 0)); j++)
;
c = com_cmdline[j];
com_cmdline[j] = 0;
strncat (build, com_cmdline + i, s - strlen (build));
strncat (build, "\n", s - strlen (build));
com_cmdline[j] = c;
i = j - 1;
}
}
// Sys_Printf("[\n%s]\n",build);
if (build[0])
Cbuf_InsertText (build);
free (build);
}
void
Cmd_Exec_File (const char *path)
{
char *f;
int len;
VFile *file;
if (!path || !*path)
return;
if ((file = Qopen (path, "r")) != NULL) {
len = COM_filelength (file);
f = (char *) malloc (len + 1);
if (f) {
f[len] = 0;
Qread (file, f, len);
Qclose (file);
// Always insert into console
Cbuf_InsertTextTo (cmd_consolebuffer, f);
free (f);
}
}
}
void
Cmd_Exec_f (void)
{
char *f;
int mark;
cmd_buffer_t *sub;
if (Cmd_Argc () != 2) {
Sys_Printf ("exec <filename> : execute a script file\n");
return;
}
mark = Hunk_LowMark ();
f = (char *) COM_LoadHunkFile (Cmd_Argv (1));
if (!f) {
Sys_Printf ("couldn't exec %s\n", Cmd_Argv (1));
return;
}
if (!Cvar_Command ()
&& (cmd_warncmd->int_val || (developer && developer->int_val)))
Sys_Printf ("execing %s\n", Cmd_Argv (1));
sub = Cmd_NewBuffer (true);
Cbuf_AddTextTo (sub, f);
Hunk_FreeToLowMark (mark);
Cmd_ExecuteSubroutine (sub); // Execute file in it's own buffer
}
/*
Cmd_Echo_f
Just prints the rest of the line to the console
*/
void
Cmd_Echo_f (void)
{
if (Cmd_Argc() == 2)
Sys_Printf ("%s\n", Cmd_Argv(1));
else
Sys_Printf ("%s\n", Cmd_Args (1));
}
/*
Cmd_Alias_f
Creates a new command that executes a command string (possibly ; seperated)
*/
void
Cmd_Alias_f (void)
{
cmdalias_t *alias;
char *cmd;
int i, c;
const char *s;
if (Cmd_Argc () == 1) {
Sys_Printf ("Current alias commands:\n");
for (alias = cmd_alias; alias; alias = alias->next)
Sys_Printf ("alias %s \"%s\"\n", alias->name, alias->value);
return;
}
s = Cmd_Argv (1);
// if the alias already exists, reuse it
alias = (cmdalias_t *) Hash_Find (cmd_alias_hash, s);
if (alias) {
free ((char *) alias->value);
} else {
cmdalias_t **a;
alias = calloc (1, sizeof (cmdalias_t));
if (!alias)
Sys_Error ("Cmd_Alias_f: Memory Allocation Failure\n");
alias->name = strdup (s);
Hash_Add (cmd_alias_hash, alias);
for (a = &cmd_alias; *a; a = &(*a)->next)
if (strcmp ((*a)->name, alias->name) >= 0)
break;
alias->next = *a;
*a = alias;
}
// copy the rest of the command line
cmd = malloc (strlen (Cmd_Args (1)) + 2); // can never be longer
if (!cmd)
Sys_Error ("Cmd_Alias_f: Memory Allocation Failure\n");
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, " ");
}
alias->value = cmd;
}
void
Cmd_UnAlias_f (void)
{
cmdalias_t *alias;
const char *s;
if (Cmd_Argc () != 2) {
Sys_Printf ("unalias <alias>: erase an existing alias\n");
return;
}
s = Cmd_Argv (1);
alias = Hash_Del (cmd_alias_hash, s);
if (alias) {
cmdalias_t **a;
for (a = &cmd_alias; *a != alias; a = &(*a)->next)
;
*a = alias->next;
free ((char *) alias->name);
free ((char *) alias->value);
free (alias);
} else {
Sys_Printf ("Unknown alias \"%s\"\n", s);
}
}
/*
COMMAND EXECUTION
*/
typedef struct cmd_function_s {
struct cmd_function_s *next;
const char *name;
xcommand_t function;
const char *description;
qboolean pure;
} cmd_function_t;
static cmd_function_t *cmd_functions; // possible commands to execute
int
Cmd_Argc (void)
{
return cmd_activebuffer->argc;
}
const char *
Cmd_Argv (int arg)
{
if (arg >= cmd_activebuffer->argc)
return "";
if (cmd_activebuffer->argv[arg]->state == 1)
return cmd_activebuffer->argv[arg]->processed->str;
else
return cmd_activebuffer->argv[arg]->original->str;
}
const char *
Cmd_Argu (int arg)
{
if (arg >= cmd_activebuffer->argc)
return "";
return cmd_activebuffer->argv[arg]->original->str;
}
/*
Cmd_Args
Returns a single string containing argv(start) to argv(argc()-1)
*/
const char *
Cmd_Args (int start)
{
if (start >= cmd_activebuffer->argc)
return "";
return cmd_activebuffer->line->str + cmd_activebuffer->args[start];
}
int
Cmd_EndDoubleQuote (const char *str)
{
int i;
for (i = 1; i < strlen (str); i++) {
if (str[i] == '\"' && !escaped (str, i))
return i;
}
return -1; // Not found
}
int
Cmd_EndSingleQuote (const char *str)
{
int i;
for (i = 1; i < strlen (str); i++) {
if (str[i] == '\'' && !escaped (str, i))
return i;
}
return -1; // Not found
}
int
Cmd_EndBrace (const char *str)
{
int i, n;
for (i = 1; i < strlen (str); i++) {
if (str[i] == '{' && !escaped (str, i)) {
n = Cmd_EndBrace (str + i);
if (n < 0)
return n;
else
i += n;
} else if (str[i] == '\"' && !escaped (str, i)) {
n = Cmd_EndDoubleQuote (str + i);
if (n < 0)
return n;
else
i += n;
} else if (str[i] == '\'' && !escaped (str, i)) {
n = Cmd_EndSingleQuote (str + i);
if (n < 0)
return n;
else
i += n;
} else if (str[i] == '}' && !escaped (str, i))
return i;
}
return -1; // No matching brace found
}
int
Cmd_GetToken (const char *str, qboolean legacy)
{
int i;
if (!legacy) {
if (*str == '\'')
return Cmd_EndSingleQuote (str);
if (*str == '{')
return Cmd_EndBrace (str);
if (*str == '}')
return -1;
}
if (*str == '\"')
return Cmd_EndDoubleQuote (str);
for (i = 0; i < strlen (str); i++)
if (isspace (str[i]))
break;
return i;
}
int tag_shift = 0;
int tag_special = 0;
struct stable_s {
char a, b;
} stable1[] = {
{'f', 0x0D}, // Fake message
{'[', 0x90}, // Gold braces
{']', 0x91},
{'(', 0x80}, // Scroll bar characters
{'=', 0x81},
{')', 0x82},
{'|', 0x83},
{'<', 0x9D}, // Vertical line characters
{'-', 0x9E},
{'>', 0x9F},
{'.', 0x05}, // White dot
{'#', 0x0B}, // White block
{'a', 0x7F}, // White arrow.
// DO NOT USE <a> WITH <b> TAG IN ANYTHING SENT TO SERVER. PERIOD.
{'A', 0x8D}, // Brown arrow
{'0', 0x92}, // Golden numbers
{'1', 0x93},
{'2', 0x94},
{'3', 0x95},
{'4', 0x96},
{'5', 0x97},
{'6', 0x98},
{'7', 0x99},
{'8', 0x9A},
{'9', 0x9B},
{0, 0}
};
/*
Cmd_ProcessTags
Looks for html-like tags in a dstring and
modifies the string accordingly
FIXME: This has become messy. Create tag.[ch]
and write a more generalized tag parser using
callbacks
*/
void
Cmd_ProcessTags (dstring_t * dstr)
{
int close = 0, ignore = 0, i, n, c;
for (i = 0; i < strlen (dstr->str); i++) {
if (dstr->str[i] == '<' && !escaped (dstr->str, i)) {
close = 0;
for (n = 1;
dstr->str[i + n] != '>' || escaped (dstr->str, i + n);
n++)
if (dstr->str[n] == 0)
return;
if (dstr->str[i + 1] == '/')
close = 1;
if (!strncmp (dstr->str + i + close + 1, "i", 1)) {
if (ignore && !close)
// If we are ignoring, ignore a non close
continue;
else if (close && ignore)
// If we are closing, turn off ignore
ignore--;
else if (!close)
ignore++; // Otherwise, turn ignore on
} else if (ignore)
// If ignore isn't being changed and we are ignore, go on
continue;
else if (!strncmp (dstr->str + i + close + 1, "b", 1))
tag_shift = close ? tag_shift - 1 : tag_shift + 1;
else if (!strncmp (dstr->str + i + close + 1, "s", 1))
tag_special = close ? tag_special - 1 : tag_special + 1;
if (tag_shift < 0)
tag_shift = 0;
if (tag_special < 0)
tag_special = 0;
dstring_snip (dstr, i, n + 1);
i--;
continue;
}
c = dstr->str[i];
/* This ignores escape characters, unless it is itself escaped */
if (c == '\\' && !escaped (dstr->str, i))
continue;
if (tag_special) {
for (n = 0; stable1[n].a; n++)
if (c == stable1[n].a)
c = dstr->str[i] = stable1[n].b;
}
if (tag_shift && c < 128)
c = (dstr->str[i] += 128);
}
}
/*
Cmd_ProcessVariablesRecursive
Looks for occurances of ${varname} and
replaces them with the contents of the
variable. Will first replace occurances
within itself.
*/
int
Cmd_ProcessVariablesRecursive (dstring_t * dstr, int start)
{
dstring_t *varname;
cmd_localvar_t *lvar;
cvar_t *cvar;
int i, n, braces = 0;
varname = dstring_newstr ();
if (dstr->str[start+1] == '{')
braces = 1;
for (i = start + 1 + braces;; i++) {
if (dstr->str[i] == '$' && (braces || dstr->str[i+1] == '{') && !escaped (dstr->str, i)) {
n = Cmd_ProcessVariablesRecursive (dstr, i);
if (n < 0) {
break;
} else {
i += n - 1;
continue;
}
} else if (braces && dstr->str[i] == '}' && !escaped (dstr->str, i)) {
dstring_clearstr (varname);
dstring_insert (varname, dstr->str + start + 2, i - start - 2, 0);
// Nuke it, even if no match is found
dstring_snip (dstr, start, i - start + 1);
lvar = (cmd_localvar_t *) Hash_Find (cmd_activebuffer->locals,
varname->str);
if (lvar) {
// Local variables get precedence
dstring_insertstr (dstr, lvar->value->str, start);
n = strlen (lvar->value->str);
} else if ((cvar = Cvar_FindVar (varname->str))) {
// Then cvars
// Stick in the value of variable
dstring_insertstr (dstr, cvar->string, start);
n = strlen (cvar->string);
} else
n = 0;
break;
} else if (!dstr->str[i] && braces) { // No closing brace
n = -1;
break;
} else if (!braces && !isalnum(dstr->str[i]) && dstr->str[i] != '_') {
dstring_clearstr (varname);
dstring_insert (varname, dstr->str + start + 1, i - start - 1, 0);
// Nuke it, even if no match is found
dstring_snip (dstr, start, i - start);
lvar = (cmd_localvar_t *) Hash_Find (cmd_activebuffer->locals,
varname->str);
if (lvar) {
// Local variables get precedence
dstring_insertstr (dstr, lvar->value->str, start);
n = strlen (lvar->value->str);
} else if ((cvar = Cvar_FindVar (varname->str))) {
// Then cvars
// Stick in the value of variable
dstring_insertstr (dstr, cvar->string, start);
n = strlen (cvar->string);
} else
n = 0;
break;
}
}
dstring_delete (varname);
return n;
}
int
Cmd_ProcessEmbedded (dstring_t * dstr)
{
int i, n, braces = 0, ret = 0;
cmd_buffer_t *temp;
dstring_t *command;
command = dstring_newstr ();
for (i = 0; i < strlen(dstr->str); i++) {
if (dstr->str[i] == '~' && dstr->str[i+1] == '{' && !escaped (dstr->str,i)) {
braces++;
for (n = 2; dstr->str[i+n]; n++) {
if (dstr->str[i+n] == '{')
braces++;
if (dstr->str[i+n] == '}') {
braces--;
if (!braces)
break;
}
}
if (braces) {
Cmd_Error ("Parse error: Unmatched brace in embedded command expression.\n");
ret = -1;
break;
}
dstring_clearstr (command);
dstring_insert (command, dstr->str + i + 2, n - 2, 0);
temp = Cmd_NewBuffer (false);
temp->imperative = true;
temp->locals = cmd_activebuffer->locals;
Cbuf_InsertTextTo (temp, command->str);
Cbuf_ExecuteBuffer (temp);
if (!cmd_error) {
dstring_snip(dstr, i, n +1);
if (temp->next && temp->next->returning) {
dstring_insertstr (dstr, temp->next->retval->str, i);
i += strlen(temp->next->retval->str) - 1;
}
else {
Cmd_Error ("GIB: Embedded command expression resulted in no return value.\n");
ret = -1;
Cmd_FreeStack (temp);
break;
}
}
Cmd_FreeStack (temp);
}
}
dstring_delete (command);
return ret;
}
int
Cmd_ProcessVariables (dstring_t * dstr)
{
int i, n;
for (i = 0; i < strlen (dstr->str); i++) {
if (dstr->str[i] == '$' && !escaped (dstr->str, i)) {
n = Cmd_ProcessVariablesRecursive (dstr, i);
if (n < 0)
return n;
else
i += n - 1;
}
}
return 0;
}
int
Cmd_ProcessMath (dstring_t * dstr)
{
dstring_t *statement;
int i, n, paren;
float value;
char *temp;
int ret = 0;
statement = dstring_newstr ();
for (i = 0; i < strlen (dstr->str); i++) {
if (dstr->str[i] == '#' && dstr->str[i + 1] == '('
&& !escaped (dstr->str, i)) {
paren = 1;
for (n = 2;dstr->str[i+n]; n++) {
if (dstr->str[i + n] == '(')
paren++;
else if (dstr->str[i + n] == ')') {
paren--;
if (!paren)
break;
}
}
if (paren) {
ret = -1;
break;
}
/* Copy text between parentheses into a buffer */
dstring_clearstr (statement);
dstring_insert (statement, dstr->str + i + 2, n - 2, 0);
value = EXP_Evaluate (statement->str);
if (EXP_ERROR == EXP_E_NORMAL) {
temp = va ("%g", value);
dstring_snip (dstr, i, n + 1); // Nuke the statement
dstring_insertstr (dstr, temp, i); // Stick in the value
i += strlen (temp) - 1;
} else {
ret = -2;
Cmd_Error (va("Math error: invalid expression %s\n", statement->str));
break; // Math evaluation error
}
}
}
dstring_delete (statement);
return ret;
}
/*
Cmd_ProcessEscapes
Looks for the escape character \ and
removes it. Special cases exist for
\\ and \n; otherwise, it is simply
filtered. This should be the last
step in the parser so that quotes,
tags, etc. can be escaped
*/
void
Cmd_ProcessEscapes (dstring_t * dstr)
{
int i;
for (i = 0; i < strlen (dstr->str); i++) {
if (dstr->str[i] == '\\' && dstr->str[i+1]) {
dstring_snip (dstr, i, 1);
if (dstr->str[i] == '\\')
i++;
if (dstr->str[i] == 'n')
dstr->str[i] = '\n';
i--;
}
}
}
int
Cmd_ProcessToken (cmd_token_t *token)
{
int res;
dstring_clearstr (token->processed);
dstring_appendstr (token->processed, token->original->str);
Cmd_ProcessTags (token->processed);
res = Cmd_ProcessEmbedded (token->processed);
if (res < 0)
return res;
res = Cmd_ProcessVariables (token->processed);
if (res < 0) {
Cmd_Error ("Parse error: Unmatched braces in "
"variable substitution expression.\n");
return res;
}
res = Cmd_ProcessMath (token->processed);
if (res == -1) {
Cmd_Error ("Parse error: Unmatched parenthesis\n");
return res;
}
if (res == -2) {
return res;
}
Cmd_ProcessEscapes (token->processed);
return 0;
}
void
Cmd_TokenizeString (const char *text, qboolean legacy)
{
int i = 0, len = 0, quotes, braces, space, res;
const char *str = text;
unsigned int cmd_argc = 0;
cmd_function_t *cmd;
qboolean process = true;
dstring_clearstr (cmd_activebuffer->realline);
dstring_appendstr (cmd_activebuffer->realline, text);
/* Turn off tags at the beginning of a command. This causes tags to
continue past token boundaries. */
tag_shift = 0;
tag_special = 0;
if (text[0] == '|')
str++;
dstring_clearstr (cmd_activebuffer->line);
while (strlen (str + i)) {
if (!legacy && cmd_argc == 1) { // See if command wants unprocessed tokens
cmd = (cmd_function_t *) Hash_Find (cmd_hash, cmd_activebuffer->argv[0]->processed->str);
if (cmd && cmd->pure)
process = false;
}
space = 0;
while (isspace (str[i])) {
i++;
space++;
}
dstring_appendsubstr (cmd_activebuffer->line, str + i - space, space);
len = Cmd_GetToken (str + i, legacy);
if (len < 0) {
Cmd_Error ("Parse error: Unmatched quotes, braces, or "
"double quotes\n");
cmd_activebuffer->argc = 0;
return;
} else if (len == 0)
break;
cmd_argc++;
if (cmd_argc > cmd_activebuffer->maxargc) {
cmd_activebuffer->argv = realloc (cmd_activebuffer->argv,
sizeof (cmd_token_t *) * cmd_argc);
SYS_CHECKMEM (cmd_activebuffer->argv);
cmd_activebuffer->args = realloc (cmd_activebuffer->args,
sizeof (int) * cmd_argc);
SYS_CHECKMEM (cmd_activebuffer->args);
cmd_activebuffer->argv[cmd_argc - 1] = Cmd_NewToken ();
cmd_activebuffer->maxargc++;
}
dstring_clearstr (cmd_activebuffer->argv[cmd_argc-1]->original);
/* Remove surrounding quotes or double quotes or braces */
quotes = 0;
braces = 0;
cmd_activebuffer->args[cmd_argc - 1] = strlen (cmd_activebuffer->line->str);
if ((str[i] == '\'' && str[i + len] == '\'')
|| (str[i] == '"' && str[i + len] == '"')) {
dstring_appendsubstr (cmd_activebuffer->line, str + i, 1);
dstring_appendsubstr (cmd_activebuffer->line, str + i, 1);
i++;
len -= 1;
quotes = 1;
}
if (str[i] == '{' && str[i + len] == '}') {
i++;
len -= 1;
braces = 1;
}
dstring_insert (cmd_activebuffer->argv[cmd_argc-1]->original, str + i, len, 0);
if (!legacy && !braces && process && text[0] != '|') {
res = Cmd_ProcessToken (cmd_activebuffer->argv[cmd_argc-1]);
if (res < 0) {
cmd_activebuffer->argc = 0;
return;
}
cmd_activebuffer->argv[cmd_argc-1]->state = 1;
dstring_insertstr (cmd_activebuffer->line,
cmd_activebuffer->argv[cmd_argc-1]->processed->str,
strlen (cmd_activebuffer->line->str) - quotes);
}
else {
cmd_activebuffer->argv[cmd_argc-1]->state = 0;
dstring_insertstr (cmd_activebuffer->line,
cmd_activebuffer->argv[cmd_argc-1]->original->str,
strlen (cmd_activebuffer->line->str) - quotes);
}
i += len + quotes + braces; /* If we ended on a quote or brace,
skip it */
}
cmd_activebuffer->argc = cmd_argc;
}
void
Cmd_AddCommand (const char *cmd_name, xcommand_t function,
const char *description)
{
cmd_function_t *cmd;
cmd_function_t **c;
// fail if the command is a variable name
if (Cvar_FindVar (cmd_name)) {
Sys_Printf ("Cmd_AddCommand: %s already defined as a var\n", cmd_name);
return;
}
// fail if the command already exists
cmd = (cmd_function_t *) Hash_Find (cmd_hash, cmd_name);
if (cmd) {
Sys_Printf ("Cmd_AddCommand: %s already defined\n", cmd_name);
return;
}
cmd = calloc (1, sizeof (cmd_function_t));
if (!cmd)
Sys_Error ("Cmd_AddCommand: Memory_Allocation_Failure\n");
cmd->name = cmd_name;
cmd->function = function;
cmd->description = description;
Hash_Add (cmd_hash, cmd);
for (c = &cmd_functions; *c; c = &(*c)->next)
if (strcmp ((*c)->name, cmd->name) >= 0)
break;
cmd->next = *c;
*c = cmd;
}
void
Cmd_SetPure (const char *name)
{
cmd_function_t *cmd;
cmd = (cmd_function_t *) Hash_Find (cmd_hash, name);
if (cmd)
cmd->pure = true;
}
qboolean
Cmd_Exists (const char *cmd_name)
{
cmd_function_t *cmd;
cmd = (cmd_function_t *) Hash_Find (cmd_hash, cmd_name);
if (cmd) {
return true;
}
return false;
}
const char *
Cmd_CompleteCommand (const 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 (!strcasecmp (partial, cmd->name))
return cmd->name;
for (a = cmd_alias; a; a = a->next)
if (!strcasecmp (partial, a->name))
return a->name;
// check for partial match
for (cmd = cmd_functions; cmd; cmd = cmd->next)
if (!strncasecmp (partial, cmd->name, len))
return cmd->name;
for (a = cmd_alias; a; a = a->next)
if (!strncasecmp (partial, a->name, len))
return a->name;
return NULL;
}
/*
Cmd_CompleteCountPossible
New function for tab-completion system
Added by EvilTypeGuy
Thanks to Fett erich@heintz.com
Thanks to taniwha
*/
int
Cmd_CompleteCountPossible (const char *partial)
{
cmd_function_t *cmd;
int len;
int h;
h = 0;
len = strlen (partial);
if (!len)
return 0;
// Loop through the command list and count all partial matches
for (cmd = cmd_functions; cmd; cmd = cmd->next)
if (!strncasecmp (partial, cmd->name, len))
h++;
return h;
}
/*
Cmd_CompleteBuildList
New function for tab-completion system
Added by EvilTypeGuy
Thanks to Fett erich@heintz.com
Thanks to taniwha
*/
const char **
Cmd_CompleteBuildList (const char *partial)
{
cmd_function_t *cmd;
int len = 0;
int bpos = 0;
int sizeofbuf;
const char **buf;
sizeofbuf = (Cmd_CompleteCountPossible (partial) + 1) * sizeof (char *);
len = strlen (partial);
buf = malloc (sizeofbuf + sizeof (char *));
if (!buf)
Sys_Error ("Cmd_CompleteBuildList: Memory Allocation Failure\n");
// Loop through the alias list and print all matches
for (cmd = cmd_functions; cmd; cmd = cmd->next)
if (!strncasecmp (partial, cmd->name, len))
buf[bpos++] = cmd->name;
buf[bpos] = NULL;
return buf;
}
/*
Cmd_CompleteAlias
New function for tab-completion system
Added by EvilTypeGuy
Thanks to Fett erich@heintz.com
Thanks to taniwha
*/
const char *
Cmd_CompleteAlias (const char *partial)
{
cmdalias_t *alias;
int len;
len = strlen (partial);
if (!len)
return NULL;
// Check functions
for (alias = cmd_alias; alias; alias = alias->next)
if (!strncasecmp (partial, alias->name, len))
return alias->name;
return NULL;
}
/*
Cmd_CompleteAliasCountPossible
New function for tab-completion system
Added by EvilTypeGuy
Thanks to Fett erich@heintz.com
Thanks to taniwha
*/
int
Cmd_CompleteAliasCountPossible (const char *partial)
{
cmdalias_t *alias;
int len;
int h;
h = 0;
len = strlen (partial);
if (!len)
return 0;
// Loop through the command list and count all partial matches
for (alias = cmd_alias; alias; alias = alias->next)
if (!strncasecmp (partial, alias->name, len))
h++;
return h;
}
/*
Cmd_CompleteAliasBuildList
New function for tab-completion system
Added by EvilTypeGuy
Thanks to Fett erich@heintz.com
Thanks to taniwha
*/
const char **
Cmd_CompleteAliasBuildList (const char *partial)
{
cmdalias_t *alias;
int len = 0;
int bpos = 0;
int sizeofbuf = (Cmd_CompleteAliasCountPossible (partial) + 1) *
sizeof (char *);
const char **buf;
len = strlen (partial);
buf = malloc (sizeofbuf + sizeof (char *));
if (!buf)
Sys_Error ("Cmd_CompleteAliasBuildList: Memory Allocation Failure\n");
// Loop through the alias list and print all matches
for (alias = cmd_alias; alias; alias = alias->next)
if (!strncasecmp (partial, alias->name, len))
buf[bpos++] = alias->name;
buf[bpos] = NULL;
return buf;
}
/*
Cmd_ExecuteString
A complete command line has been parsed, so try to execute it
*/
void
Cmd_ExecuteString (const char *text, cmd_source_t src)
{
cmd_function_t *cmd;
cmdalias_t *a;
cmd_source = src;
Cmd_TokenizeString (text, cmd_activebuffer->legacy);
// execute the command line
if (!Cmd_Argc ())
return; // no tokens
// check functions
cmd = (cmd_function_t *) Hash_Find (cmd_hash, Cmd_Argv (0));
if (cmd) {
if (cmd->function)
cmd->function ();
return;
}
// Tonik: check cvars
if (Cvar_Command ())
return;
// check alias
a = (cmdalias_t *) Hash_Find (cmd_alias_hash, Cmd_Argv (0));
if (a) {
int i;
cmd_buffer_t *sub; // Create a new buffer to execute the alias in
sub = Cmd_NewBuffer (true);
Cbuf_InsertTextTo (sub, a->value);
for (i = 0; i < Cmd_Argc (); i++)
Cmd_SetLocal (sub, va ("%i", i), Cmd_Argv (i));
Cmd_SetLocal (sub, "argn", va ("%i", Cmd_Argc ()));
// This will handle freeing the buffer for us, leave it alone
Cmd_ExecuteSubroutine (sub);
return;
}
if (cmd_warncmd->int_val || developer->int_val)
Sys_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 (const char *parm)
{
int i;
if (!parm)
Sys_Error ("Cmd_CheckParm: NULL");
for (i = 1; i < Cmd_Argc (); i++)
if (!strcasecmp (parm, Cmd_Argv (i)))
return i;
return 0;
}
void
Cmd_CmdList_f (void)
{
cmd_function_t *cmd;
int i;
int show_description = 0;
if (Cmd_Argc () > 1)
show_description = 1;
for (cmd = cmd_functions, i = 0; cmd; cmd = cmd->next, i++) {
if (show_description) {
Sys_Printf ("%-20s :\n%s\n", cmd->name, cmd->description);
} else {
Sys_Printf ("%s\n", cmd->name);
}
}
Sys_Printf ("------------\n%d commands\n", i);
}
void
Cmd_Help_f (void)
{
const char *name;
cvar_t *var;
cmd_function_t *cmd;
if (Cmd_Argc () != 2) {
Sys_Printf ("usage: help <cvar/command>\n");
return;
}
name = Cmd_Argv (1);
for (cmd = cmd_functions; cmd && strcasecmp (name, cmd->name);
cmd = cmd->next)
;
if (cmd) {
Sys_Printf ("%s\n", cmd->description);
return;
}
var = Cvar_FindVar (name);
if (!var)
var = Cvar_FindAlias (name);
if (var) {
Sys_Printf ("%s\n", var->description);
return;
}
Sys_Printf ("variable/command not found\n");
}
/*
Scripting commands
The following functions are commands for enhanced scripting
*/
void
Cmd_If_f (void)
{
long int num;
if (Cmd_Argc () < 3) {
Sys_Printf ("Usage: if {condition} {commands}\n");
return;
}
num = strtol (Cmd_Argv(1), 0, 10);
if (!strcmp(Cmd_Argv(0), "ifnot"))
num = !num;
if (num)
Cbuf_InsertText (Cmd_Argv (2));
return;
}
void
Cmd_While_f (void) {
cmd_buffer_t *sub;
if (Cmd_Argc() < 3) {
Sys_Printf("Usage: while {condition} {commands}\n");
return;
}
sub = Cmd_NewBuffer (false);
sub->locals = cmd_activebuffer->locals; // Use current local variables
sub->loop = true;
dstring_appendstr (sub->looptext, va("ifnot '%s' break\n", Cmd_Argv(1)));
dstring_appendstr (sub->looptext, Cmd_Argv(2));
Cmd_ExecuteSubroutine (sub);
return;
}
void
Cmd_For_f (void) {
cmd_buffer_t *sub;
if (Cmd_Argc() < 4) {
Sys_Printf("Usage: for {initializer} [condition] {commands}\n");
return;
}
sub = Cmd_NewBuffer (false);
sub->locals = cmd_activebuffer->locals; // Use current local variables
sub->loop = true;
dstring_appendstr (sub->looptext, va("ifnot '%s' break\n", Cmd_Argv(2)));
dstring_appendstr (sub->looptext, va("%s\n", Cmd_Argv(4)));
dstring_appendstr (sub->looptext, va("%s", Cmd_Argv(3)));
Cbuf_InsertTextTo (sub, Cmd_Argv(1));
Cmd_ExecuteSubroutine (sub);
return;
}
void
Cmd_Break_f (void) {
if (cmd_activebuffer->loop) {
cmd_activebuffer->loop = false;
dstring_clearstr(cmd_activebuffer->buffer);
return;
}
else {
Cmd_Error("break command used outside of loop!\n");
return;
}
}
void
Cmd_Return_f (void) {
if (Cmd_Argc() > 2) {
Cmd_Error("GIB: Invalid return statement. Return takes either one argument or none.\n");
return;
}
if (!cmd_activebuffer->prev) {
Cmd_Error("GIB: Return attempted in a root buffer\n");
return;
}
while (cmd_activebuffer->loop) // We need to get out of any loops
cmd_activebuffer = cmd_activebuffer->prev;
if (cmd_activebuffer->next) {
Cmd_FreeStack (cmd_activebuffer->next);
cmd_activebuffer->next = 0;
}
dstring_clearstr (cmd_activebuffer->buffer); // Clear the buffer out no matter what
if (Cmd_Argc() == 2) {
dstring_clearstr (cmd_activebuffer->retval);
dstring_appendstr (cmd_activebuffer->retval, Cmd_Argv(1));
cmd_activebuffer->returning = true;
}
}
void
Cmd_Lset_f (void)
{
if (Cmd_Argc () != 3) {
Sys_Printf ("Usage: lset [local variable] [value]\n");
return;
}
Cmd_SetLocal (cmd_activebuffer, Cmd_Argv (1), Cmd_Argv (2));
}
void
Cmd_Backtrace_f (void)
{
Sys_Printf ("%s", cmd_backtrace->str);
}
void
Cmd_Hash_Stats_f (void)
{
Sys_Printf ("alias hash table:\n");
Hash_Stats (cmd_alias_hash);
Sys_Printf ("command hash table:\n");
Hash_Stats (cmd_hash);
}
static void
cmd_alias_free (void *_a, void *unused)
{
cmdalias_t *a = (cmdalias_t *) _a;
free ((char *) a->name);
free ((char *) a->value);
free (a);
}
static const char *
cmd_alias_get_key (void *_a, void *unused)
{
cmdalias_t *a = (cmdalias_t *) _a;
return a->name;
}
static const char *
cmd_get_key (void *c, void *unused)
{
cmd_function_t *cmd = (cmd_function_t *) c;
return cmd->name;
}
/*
Cmd_Init_Hash
initialise the command and alias hash tables
*/
void
Cmd_Init_Hash (void)
{
cmd_hash = Hash_NewTable (1021, cmd_get_key, 0, 0);
cmd_alias_hash = Hash_NewTable (1021, cmd_alias_get_key, cmd_alias_free, 0);
}
void
Cmd_Init (void)
{
// register our commands
Cmd_AddCommand ("stuffcmds", Cmd_StuffCmds_f, "Execute the commands given "
"at startup again");
Cmd_AddCommand ("exec", Cmd_Exec_f, "Execute a script file");
Cmd_AddCommand ("echo", Cmd_Echo_f, "Print text to console");
Cmd_AddCommand ("alias", Cmd_Alias_f, "Used to create a reference to a "
"command or list of commands.\n"
"When used without parameters, displays all current "
"aliases.\n"
"Note: Enclose multiple commands within quotes and "
"seperate each command with a semi-colon.");
Cmd_AddCommand ("unalias", Cmd_UnAlias_f, "Remove the selected alias");
Cmd_AddCommand ("wait", Cmd_Wait_f, "Wait a game tic");
Cmd_AddCommand ("cmdlist", Cmd_CmdList_f, "List all commands");
Cmd_AddCommand ("help", Cmd_Help_f, "Display help for a command or "
"variable");
Cmd_AddCommand ("if", Cmd_If_f, "Conditionally execute a set of commands.");
Cmd_AddCommand ("ifnot", Cmd_If_f, "Conditionally execute a set of commands if the condition is false.");
Cmd_AddCommand ("while", Cmd_While_f, "Execute a set of commands while a condition is true.");
Cmd_SetPure ("while");
Cmd_AddCommand ("for", Cmd_For_f, "A while loop with initialization and iteration commands.");
Cmd_SetPure ("for");
Cmd_AddCommand ("break", Cmd_Break_f, "Break out of a loop.");
Cmd_AddCommand ("return", Cmd_Return_f, "Return a value to calling buffer.");
Cmd_AddCommand ("lset", Cmd_Lset_f, "Sets the value of a local variable (not cvar).");
Cmd_AddCommand ("backtrace", Cmd_Backtrace_f, "Show a description of the last GIB error and a backtrace.");
//Cmd_AddCommand ("cmd_hash_stats", Cmd_Hash_Stats_f, "Display statistics "
// "alias and command hash tables");
cmd_warncmd = Cvar_Get ("cmd_warncmd", "0", CVAR_NONE, NULL, "Toggles the "
"display of error messages for unknown commands");
cmd_maxloop = Cvar_Get ("cmd_maxloop", "0", CVAR_NONE, NULL, "Controls the "
"maximum number of iterations a loop in GIB can do "
"before being forcefully terminated. 0 is infinite.");
}
char *com_token;
static size_t com_token_size;
static inline void
write_com_token (size_t pos, char c)
{
if (pos + 1 <= com_token_size) {
write:
com_token[pos] = c;
return;
}
com_token_size = (pos + 1024) & ~1023;
com_token = realloc (com_token, com_token_size);
if (!com_token)
Sys_Error ("COM_Parse: could not allocate %ld bytes",
(long) com_token_size);
goto write;
}
/*
COM_Parse
Parse a token out of a string
FIXME: Does anything still need this crap?
*/
const char *
COM_Parse (const char *_data)
{
const byte *data = (const byte *) _data;
unsigned int c;
size_t len = 0;
write_com_token (len, 0);
if (!data)
return NULL;
// skip whitespace
skipwhite:
while ((c = *data) <= ' ') {
if (c == 0)
return NULL; // end of file;
data++;
}
// skip // comments
if (c == '/' && data[1] == '/') {
while (*data && *data != '\n')
data++;
goto skipwhite;
}
// handle quoted strings specially
if (c == '\"') {
data++;
while (1) {
c = *data++;
if (c == '\"' || !c) {
write_com_token (len, 0);
return c ? data : data - 1;
}
write_com_token (len, c);
len++;
}
}
// parse a regular word
do {
write_com_token (len, c);
data++;
len++;
c = *data;
} while (c > 32);
write_com_token (len, 0);
return data;
}
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