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https://github.com/jart/cosmopolitan.git
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e16a7d8f3b
`et` means `expandtab`. ```sh rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\) et\(.*\) :vi/vi: \1 xoet\2:vi/' rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\)noet\(.*\):vi/vi: \1et\2 :vi/' rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\)xoet\(.*\):vi/vi: \1noet\2:vi/' ```
93 lines
3.5 KiB
C
93 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 et 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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