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https://github.com/jart/cosmopolitan.git
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c88f95a892
Unlike CMD.EXE, CreateProcess() doesn't care if an executable name ends with .COM or .EXE. We now have the unbourne shell and bash working well on Windows, so we don't need DOS anymore. Making this change will grant us better performance, particularly for builds, because commandv() will need to make fewer system calls. Path mangling magic still happens with WinMain() and ntspawn() in order to do things like turn \ into / so the interop works well at the borders. But all the code in libraries, which did that, has been removed. It's not possible for libraries to abstract the differences between paths.
92 lines
3.5 KiB
C
92 lines
3.5 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/calls/calls.h"
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#include "libc/calls/struct/stat.h"
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#include "libc/errno.h"
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#include "libc/intrin/strace.internal.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/ok.h"
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#include "libc/sysv/consts/s.h"
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#include "libc/sysv/errfuns.h"
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/**
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* Resolves full pathname of executable.
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*
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* @return execve()'able path, or NULL w/ errno
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* @errno ENOENT, EACCES, ENOMEM
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* @see free(), execvpe()
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* @asyncsignalsafe
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* @vforksafe
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*/
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char *commandv(const char *name, char *pathbuf, size_t pathbufsz) {
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// bounce empty names
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size_t namelen;
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if (!(namelen = strlen(name))) {
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enoent();
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return 0;
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}
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// get system path
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const char *syspath;
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if (memchr(name, '/', namelen)) {
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syspath = "";
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} else if (!(syspath = getenv("PATH"))) {
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syspath = _PATH_DEFPATH;
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}
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// iterate through directories
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int old_errno = errno;
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bool seen_eacces = false;
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const char *b, *a = syspath;
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errno = ENOENT;
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do {
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b = strchrnul(a, ':');
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size_t dirlen = b - a;
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if (dirlen + 1 + namelen < pathbufsz) {
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if (dirlen) {
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memcpy(pathbuf, a, dirlen);
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pathbuf[dirlen] = '/';
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memcpy(pathbuf + dirlen + 1, name, namelen + 1);
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} else {
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memcpy(pathbuf, name, namelen + 1);
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}
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if (!access(pathbuf, X_OK)) {
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struct stat st;
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if (!stat(pathbuf, &st) && S_ISREG(st.st_mode)) {
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errno = old_errno;
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return pathbuf;
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}
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} else if (errno == EACCES) {
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seen_eacces = true;
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}
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} else {
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enametoolong();
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}
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a = b + 1;
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} while (*b);
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// return error if not found
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if (seen_eacces) {
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errno = EACCES;
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}
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return 0;
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}
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