125 lines
5.0 KiB
C
125 lines
5.0 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
|
|
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
|
│ Copyright 2020 Justine Alexandra Roberts Tunney │
|
|
│ │
|
|
│ This program is free software; you can redistribute it and/or modify │
|
|
│ it under the terms of the GNU General Public License as published by │
|
|
│ the Free Software Foundation; version 2 of the License. │
|
|
│ │
|
|
│ This program is distributed in the hope that it will be useful, but │
|
|
│ WITHOUT ANY WARRANTY; without even the implied warranty of │
|
|
│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
|
|
│ General Public License for more details. │
|
|
│ │
|
|
│ You should have received a copy of the GNU General Public License │
|
|
│ along with this program; if not, write to the Free Software │
|
|
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
|
|
│ 02110-1301 USA │
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
|
#include "libc/bits/progn.h"
|
|
#include "libc/bits/safemacros.h"
|
|
#include "libc/calls/calls.h"
|
|
#include "libc/conv/conv.h"
|
|
#include "libc/dce.h"
|
|
#include "libc/errno.h"
|
|
#include "libc/nt/ntdll.h"
|
|
#include "libc/runtime/missioncritical.h"
|
|
#include "libc/runtime/runtime.h"
|
|
#include "libc/str/str.h"
|
|
#include "libc/sysv/consts/ok.h"
|
|
#include "libc/sysv/errfuns.h"
|
|
|
|
static int accessexe(char pathname[hasatleast PATH_MAX], size_t len,
|
|
const char *ext) {
|
|
len = stpcpy(&pathname[len], ext) - &pathname[0];
|
|
if (isexecutable(pathname)) {
|
|
return len;
|
|
} else {
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
static int accesscmd(char pathname[hasatleast PATH_MAX], const char *path,
|
|
const char *name, size_t namelen) { /* cf. %PATHEXT% */
|
|
int rc;
|
|
char *p;
|
|
bool hasdot;
|
|
size_t pathlen, len;
|
|
pathlen = strlen(path);
|
|
if (pathlen + 1 + namelen + 1 + 4 + 1 > PATH_MAX) return -1;
|
|
p = mempcpy(pathname, path, pathlen);
|
|
if (pathlen && pathname[pathlen - 1] != '/') *p++ = '/';
|
|
p = mempcpy(p, name, namelen);
|
|
len = p - &pathname[0];
|
|
hasdot = !!memchr(basename(name), '.', namelen);
|
|
if ((hasdot && (rc = accessexe(pathname, len, "")) != -1) ||
|
|
(!hasdot &&
|
|
((rc = accessexe(pathname, len, ".com")) != -1 ||
|
|
(IsWindows() && (rc = accessexe(pathname, len, ".exe")) != -1) ||
|
|
(!IsWindows() && (rc = accessexe(pathname, len, "")) != -1)))) {
|
|
return rc;
|
|
} else {
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
static int searchcmdpath(char pathname[hasatleast PATH_MAX], const char *name,
|
|
size_t namelen) {
|
|
int rc;
|
|
char *path, *pathtok, ep[PATH_MAX];
|
|
rc = -1;
|
|
if (!memccpy(ep,
|
|
firstnonnull(emptytonull(getenv("PATH")),
|
|
"/bin:/usr/local/bin:/usr/bin"),
|
|
'\0', sizeof(ep))) {
|
|
return enomem();
|
|
}
|
|
pathtok = ep;
|
|
while ((path = strsep(&pathtok, IsWindows() ? ";" : ":"))) {
|
|
if (strchr(path, '=')) continue;
|
|
if ((rc = accesscmd(pathname, path, name, namelen)) != -1) {
|
|
break;
|
|
}
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
static char *mkcmdquery(const char *name, size_t namelen,
|
|
char scratch[hasatleast PATH_MAX]) {
|
|
char *p;
|
|
if (namelen + 1 + 1 > PATH_MAX) return NULL;
|
|
p = mempcpy(scratch, name, namelen);
|
|
*p++ = '=';
|
|
*p++ = '\0';
|
|
if (IsWindows() || IsXnu()) strntolower(scratch, namelen);
|
|
return &scratch[0];
|
|
}
|
|
|
|
/**
|
|
* Resolves full pathname of executable.
|
|
*
|
|
* @return execve()'able path, or NULL w/ errno
|
|
* @errno ENOENT, EACCES, ENOMEM
|
|
* @see free(), execvpe()
|
|
*/
|
|
char *commandv(const char *name, char pathbuf[hasatleast PATH_MAX]) {
|
|
char *p;
|
|
size_t len;
|
|
int rc, olderr;
|
|
olderr = errno;
|
|
if (!(len = strlen(name))) return PROGN(enoent(), NULL);
|
|
if (memchr(name, '=', len)) return PROGN(einval(), NULL);
|
|
if ((IsWindows() &&
|
|
((rc = accesscmd(pathbuf, kNtSystemDirectory, name, len)) != -1 ||
|
|
(rc = accesscmd(pathbuf, kNtWindowsDirectory, name, len)) != -1)) ||
|
|
(rc = accesscmd(pathbuf, "", name, len)) != -1 ||
|
|
(!strpbrk(name, "/\\") &&
|
|
(rc = searchcmdpath(pathbuf, name, len)) != -1)) {
|
|
errno = olderr;
|
|
return pathbuf;
|
|
} else {
|
|
return NULL;
|
|
}
|
|
}
|