mirror of
https://github.com/jart/cosmopolitan.git
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95 lines
3.9 KiB
C
95 lines
3.9 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 2021 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/calls/calls.h"
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#include "libc/calls/syscall-sysv.internal.h"
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#include "libc/dce.h"
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#include "libc/errno.h"
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#include "libc/intrin/bits.h"
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#include "libc/intrin/safemacros.internal.h"
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#include "libc/mem/alloca.h"
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#include "libc/paths.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/at.h"
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#include "libc/sysv/consts/o.h"
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#include "libc/sysv/consts/ok.h"
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#include "libc/sysv/errfuns.h"
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static bool CanExecute(const char *path) {
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return !sys_faccessat(AT_FDCWD, path, X_OK, 0);
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}
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static bool IsApeBinary(const char *path) {
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int fd;
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char buf[8];
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bool res = false;
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if ((fd = sys_open(path, O_RDONLY, 0)) != -1) {
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if (sys_read(fd, buf, 8) == 8 && READ64LE(buf) == READ64LE("MZqFpD='")) {
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res = true;
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}
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sys_close(fd);
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}
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return res;
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}
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static const char *Join(const char *a, const char *b, char buf[PATH_MAX]) {
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size_t n, m;
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n = strlen(a);
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m = strlen(b);
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if (n + 1 + m + 1 < PATH_MAX) {
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stpcpy(stpcpy(stpcpy(buf, a), "/"), b);
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return buf;
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} else {
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return "";
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}
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}
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int sys_execve(const char *prog, char *const argv[], char *const envp[]) {
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int e;
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size_t i;
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char *buf;
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char **shargs;
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const char *ape;
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e = errno;
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__sys_execve(prog, argv, envp);
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if (errno != ENOEXEC) return -1;
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for (i = 0; argv[i];) ++i;
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buf = alloca(PATH_MAX);
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shargs = alloca((i + 4) * sizeof(char *));
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if (IsApeBinary(prog) &&
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(CanExecute((ape = "/usr/bin/ape")) ||
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CanExecute((ape = Join(firstnonnull(getenv("TMPDIR"),
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firstnonnull(getenv("HOME"), ".")),
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".ape", buf))) ||
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CanExecute(
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(ape = Join(firstnonnull(getenv("HOME"), "."), ".ape", buf))))) {
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shargs[0] = ape;
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shargs[1] = "-";
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shargs[2] = prog;
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memcpy(shargs + 3, argv, (i + 1) * sizeof(char *));
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} else if (CanExecute(prog)) {
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shargs[0] = _PATH_BSHELL;
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shargs[1] = prog;
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memcpy(shargs + 2, argv + 1, i * sizeof(char *));
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} else {
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return enoexec();
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}
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errno = e;
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return __sys_execve(shargs[0], shargs, envp);
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}
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