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124 lines
5.0 KiB
124 lines
5.0 KiB
/*-*- 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.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/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/missioncritical.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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