124 lines
5.0 KiB
C
124 lines
5.0 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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│ 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/bits/progn.internal.h"
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#include "libc/bits/safemacros.internal.h"
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#include "libc/calls/calls.h"
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#include "libc/conv/conv.h"
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#include "libc/dce.h"
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#include "libc/errno.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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