mirror of
https://github.com/jart/cosmopolitan.git
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73 lines
3.4 KiB
C
73 lines
3.4 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/bits/safemacros.internal.h"
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#include "libc/calls/calls.h"
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#include "libc/calls/struct/stat.h"
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#include "libc/limits.h"
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#include "libc/runtime/runtime.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/auxv.h"
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#include "libc/sysv/consts/map.h"
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#include "libc/sysv/consts/o.h"
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#include "libc/sysv/consts/prot.h"
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#include "libc/zip.h"
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#include "libc/zipos/zipos.internal.h"
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/**
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* Returns pointer to zip central directory of current executable.
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*/
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struct Zipos *__zipos_get(void) {
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static struct Zipos zipos;
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static bool once;
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const char *exe, *dir;
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char path[PATH_MAX];
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size_t size;
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uint8_t *map, *base, *cdir;
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if (!once) {
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dir = nulltoempty(getenv("PWD")); /* suboptimal */
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exe = (const char *)getauxval(AT_EXECFN);
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if (!fileexists(exe) && strlen(dir) + 1 + strlen(exe) + 1 <= PATH_MAX) {
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stpcpy(stpcpy(stpcpy(path, dir), "/"), exe);
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exe = path;
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}
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if ((zipos.fd = open(exe, O_RDONLY)) != -1) {
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if ((size = getfiledescriptorsize(zipos.fd)) != SIZE_MAX &&
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(map = mmap(NULL, size, PROT_READ, MAP_SHARED, zipos.fd, 0)) !=
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MAP_FAILED) {
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if (endswith(exe, ".com.dbg")) {
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if ((base = memmem(map, size, "MZqFpD", 6))) {
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size -= base - map;
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} else {
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base = map;
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}
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} else {
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base = map;
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}
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if ((cdir = zipfindcentraldir(base, size))) {
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zipos.map = base;
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zipos.cdir = cdir;
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} else {
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munmap(map, size);
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}
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}
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}
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once = true;
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}
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return zipos.cdir ? &zipos : NULL;
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}
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