123 lines
4.9 KiB
C
123 lines
4.9 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 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/progn.internal.h"
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#include "libc/bits/safemacros.h"
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#include "libc/calls/calls.h"
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#include "libc/dce.h"
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#include "libc/errno.h"
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#include "libc/fmt/conv.h"
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#include "libc/nt/ntdll.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/errfuns.h"
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static int accessexe(char pathname[hasatleast PATH_MAX], size_t len,
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const char *ext) {
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len = stpcpy(&pathname[len], ext) - &pathname[0];
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if (isexecutable(pathname)) {
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return len;
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} else {
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return -1;
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}
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}
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static int accesscmd(char pathname[hasatleast PATH_MAX], const char *path,
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const char *name, size_t namelen) { /* cf. %PATHEXT% */
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int rc;
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char *p;
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bool hasdot;
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size_t pathlen, len;
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pathlen = strlen(path);
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if (pathlen + 1 + namelen + 1 + 4 + 1 > PATH_MAX) return -1;
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p = mempcpy(pathname, path, pathlen);
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if (pathlen && pathname[pathlen - 1] != '/') *p++ = '/';
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p = mempcpy(p, name, namelen);
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len = p - &pathname[0];
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hasdot = !!memchr(basename(name), '.', namelen);
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if ((hasdot && (rc = accessexe(pathname, len, "")) != -1) ||
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(!hasdot &&
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((rc = accessexe(pathname, len, ".com")) != -1 ||
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(IsWindows() && (rc = accessexe(pathname, len, ".exe")) != -1) ||
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(!IsWindows() && (rc = accessexe(pathname, len, "")) != -1)))) {
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return rc;
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} else {
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return -1;
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}
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}
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static int searchcmdpath(char pathname[hasatleast PATH_MAX], const char *name,
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size_t namelen) {
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int rc;
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char *path, *pathtok, ep[PATH_MAX];
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rc = -1;
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if (!memccpy(ep,
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firstnonnull(emptytonull(getenv("PATH")),
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"/bin:/usr/local/bin:/usr/bin"),
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'\0', sizeof(ep))) {
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return enomem();
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}
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pathtok = ep;
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while ((path = strsep(&pathtok, IsWindows() ? ";" : ":"))) {
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if (strchr(path, '=')) continue;
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if ((rc = accesscmd(pathname, path, name, namelen)) != -1) {
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break;
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}
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}
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return rc;
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}
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static char *mkcmdquery(const char *name, size_t namelen,
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char scratch[hasatleast PATH_MAX]) {
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char *p;
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if (namelen + 1 + 1 > PATH_MAX) return NULL;
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p = mempcpy(scratch, name, namelen);
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*p++ = '=';
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*p++ = '\0';
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if (IsWindows() || IsXnu()) strntolower(scratch, namelen);
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return &scratch[0];
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}
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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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*/
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char *commandv(const char *name, char pathbuf[hasatleast PATH_MAX]) {
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char *p;
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size_t len;
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int rc, olderr;
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olderr = errno;
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if (!(len = strlen(name))) return PROGN(enoent(), NULL);
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if (memchr(name, '=', len)) return PROGN(einval(), NULL);
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if ((IsWindows() &&
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((rc = accesscmd(pathbuf, kNtSystemDirectory, name, len)) != -1 ||
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(rc = accesscmd(pathbuf, kNtWindowsDirectory, name, len)) != -1)) ||
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(rc = accesscmd(pathbuf, "", name, len)) != -1 ||
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(!strpbrk(name, "/\\") &&
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(rc = searchcmdpath(pathbuf, name, len)) != -1)) {
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errno = olderr;
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return pathbuf;
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} else {
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return NULL;
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}
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}
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