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/*
* Copyright © 2023 Michael Smith <mikesmiffy128@gmail.com>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED “AS IS” AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
#include <string.h>
#include "alias.h"
#include "con_.h"
#include "errmsg.h"
#include "extmalloc.h"
#include "feature.h"
#include "gametype.h"
#include "mem.h"
#include "x86.h"
#include "x86util.h"
FEATURE("alias management")
struct alias **_alias_head;
void alias_nuke(void) {
for (struct alias *p = alias_head; p;) {
struct alias *next = p->next;
extfree(p->value); extfree(p);
p = next;
}
alias_head = 0;
}
void alias_rm(const char *name) {
for (struct alias **p = _alias_head; *p; p = &(*p)->next) {
if (!strcmp((*p)->name, name)) {
struct alias *next = (*p)->next;
extfree((*p)->value); extfree(*p);
*p = next;
return;
}
}
}
DEF_CCMD_HERE_UNREG(sst_alias_clear, "Remove all command aliases", 0) {
if (cmd->argc != 1) {
con_warn("usage: sst_alias_clear\n");
return;
}
alias_nuke();
}
DEF_CCMD_HERE_UNREG(sst_alias_remove, "Remove a command alias", 0) {
if (cmd->argc != 2) {
con_warn("usage: sst_alias_remove name\n");
return;
}
if (strlen(cmd->argv[1]) > 31) {
con_warn("invalid alias name (too long)\n");
return;
}
alias_rm(cmd->argv[1]);
}
static bool find_alias_head(con_cmdcb alias_cb) {
const uchar *insns = (const uchar *)alias_cb;
#ifdef _WIN32
for (const uchar *p = insns; p - insns < 64;) {
// alias command with no args calls ConMsg() then loads the head pointer
// that asm looks like: call <reg>; mov <reg>, dword ptr [x]
// (we don't care about the exact registers)
if (p[0] == X86_MISCMW && (p[1] & 0xF8) == 0xD0 &&
p[2] == X86_MOVRMW && (p[3] & 0xC7) == 0x05) {
_alias_head = mem_loadptr(p + 4);
return true;
}
NEXT_INSN(p, "load of alias list");
}
#else
#warning TODO(linux): check whether linux is equivalent!
#endif
return false;
}
INIT {
// TODO(compat): no idea why sst_alias_clear crashes in p2, figure out later
if (GAMETYPE_MATCHES(Portal2)) return false;
struct con_cmd *cmd_alias = con_findcmd("alias");
if (!cmd_alias) {
errmsg_warnx("couldn't find \"alias\" command");
return false;
}
if (!find_alias_head(con_getcmdcb(cmd_alias))) {
errmsg_warnx("couldn't find alias list");
return false;
};
con_reg(sst_alias_clear);
con_reg(sst_alias_remove);
return true;
}
// vi: sw=4 ts=4 noet tw=80 cc=80
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