66 lines
3.1 KiB
C
66 lines
3.1 KiB
C
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/*-*- 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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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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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/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.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;
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size_t mapsize;
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uint8_t *cdir;
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void *map;
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int fd;
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if (!once) {
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if (ZIP_CDIR_MAGIC(__zip_end) == kZipCdirHdrMagic) {
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zipos.map = _base;
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zipos.cdir = __zip_end;
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} else {
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exe = (const char *)getauxval(AT_EXECFN);
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if ((fd = open(exe, O_RDONLY)) != -1) {
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if ((mapsize = getfiledescriptorsize(fd)) != SIZE_MAX &&
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(map = mmap(NULL, mapsize, PROT_READ, MAP_SHARED, fd, 0)) !=
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MAP_FAILED) {
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if ((cdir = zipfindcentraldir(map, mapsize))) {
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zipos.map = map;
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zipos.cdir = cdir;
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} else {
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munmap(map, mapsize);
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}
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}
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close(fd);
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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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