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📄 Makefile.inc(11.75 KB)
📄 Symbol.map(8.61 KB)
📄 __getosreldate.c(2.34 KB)
📄 __pthread_mutex_init_calloc_cb_stub.c(1.78 KB)
📄 __xuname.c(3.54 KB)
📄 _once_stub.c(2.45 KB)
📄 _pthread_stubs.c(13.83 KB)
📄 _rand48.c(1.37 KB)
📄 _spinlock_stub.c(2.33 KB)
📄 _thread_init.c(1.74 KB)
📄 alarm.3(2.8 KB)
📄 alarm.c(2.1 KB)
📄 arc4random-compat.c(2.35 KB)
📄 arc4random.3(4.78 KB)
📄 arc4random.c(5.87 KB)
📄 arc4random.h(4.11 KB)
📄 arc4random_uniform.c(1.77 KB)
📄 assert.c(2.12 KB)
📄 auxv.3(3.28 KB)
📄 auxv.c(8.11 KB)
📄 basename.3(2.22 KB)
📄 basename.c(1.91 KB)
📄 basename_compat.c(2.18 KB)
📄 cap_rights_get.3(3.53 KB)
📄 cap_sandboxed.3(2.45 KB)
📄 cap_sandboxed.c(1.79 KB)
📄 check_utility_compat.3(2.99 KB)
📄 check_utility_compat.c(2.3 KB)
📄 clock.3(2.59 KB)
📄 clock.c(2.16 KB)
📄 clock_getcpuclockid.3(3.31 KB)
📄 clock_getcpuclockid.c(1.67 KB)
📄 closedir.c(2.38 KB)
📄 confstr.3(3.6 KB)
📄 confstr.c(3.78 KB)
📄 crypt.c(3.13 KB)
📄 ctermid.3(3.03 KB)
📄 ctermid.c(2.21 KB)
📄 daemon.3(3.92 KB)
📄 daemon.c(3.09 KB)
📄 devname-compat11.c(1.79 KB)
📄 devname.3(3.25 KB)
📄 devname.c(2.41 KB)
📄 directory.3(8.7 KB)
📄 dirfd.c(1.62 KB)
📄 dirname.3(2.22 KB)
📄 dirname.c(2.29 KB)
📄 dirname_compat.c(2.05 KB)
📄 disklabel.c(4.86 KB)
📄 dl_iterate_phdr.3(3.27 KB)
📄 dladdr.3(3.92 KB)
📄 dlfcn.c(6.44 KB)
📄 dlinfo.3(7.14 KB)
📄 dllockinit.3(3.9 KB)
📄 dlopen.3(11.35 KB)
📄 drand48.c(605 B)
📄 dup3.3(2.74 KB)
📄 dup3.c(1.96 KB)
📄 elf_utils.c(3.67 KB)
📄 erand48.c(691 B)
📄 err.3(5.79 KB)
📄 err.c(4.35 KB)
📄 errlst.c(8.3 KB)
📄 errno.c(1.45 KB)
📄 eventfd.c(1.79 KB)
📄 exec.3(9.24 KB)
📄 exec.c(7 KB)
📄 exect.c(1.61 KB)
📄 fdevname.c(1.83 KB)
📄 feature_present.3(2.48 KB)
📄 feature_present.c(2.26 KB)
📄 fmtcheck.3(3.27 KB)
📄 fmtcheck.c(6.92 KB)
📄 fmtmsg.3(6.45 KB)
📄 fmtmsg.c(5.86 KB)
📄 fnmatch.3(4.11 KB)
📄 fnmatch.c(8.85 KB)
📄 fpclassify.3(3.11 KB)
📄 fpclassify.c(2.67 KB)
📄 frexp.3(2.76 KB)
📄 frexp.c(1.88 KB)
📄 fstab.c(6.85 KB)
📄 ftok.3(2.71 KB)
📄 ftok.c(1.83 KB)
📄 fts-compat.c(32.07 KB)
📄 fts-compat.h(5.28 KB)
📄 fts-compat11.c(31.65 KB)
📄 fts-compat11.h(3.85 KB)
📄 fts.3(19.27 KB)
📄 fts.c(30.66 KB)
📄 ftw-compat11.c(2.59 KB)
📄 ftw.3(5.7 KB)
📄 ftw.c(2.28 KB)
📄 gen-compat.h(2.35 KB)
📄 gen-private.h(2.64 KB)
📄 getbootfile.3(2.57 KB)
📄 getbootfile.c(2.01 KB)
📄 getbsize.3(3.05 KB)
📄 getbsize.c(3 KB)
📄 getcap.3(14.8 KB)
📄 getcap.c(22.93 KB)
📄 getcontext.3(4.92 KB)
📄 getcwd.3(4.08 KB)
📄 getcwd.c(5.61 KB)
📄 getdiskbyname.3(2.23 KB)
📄 getdomainname.3(2.94 KB)
📄 getdomainname.c(1.98 KB)
📄 getentropy.3(2.05 KB)
📄 getentropy.c(4.09 KB)
📄 getfsent.3(4.54 KB)
📄 getgrent.3(6.7 KB)
📄 getgrent.c(34.33 KB)
📄 getgrouplist.3(2.81 KB)
📄 getgrouplist.c(2.03 KB)
📄 gethostname.3(3.58 KB)
📄 gethostname.c(2.02 KB)
📄 getloadavg.3(2.44 KB)
📄 getloadavg.c(2.39 KB)
📄 getlogin.c(2.65 KB)
📄 getmntinfo-compat11.c(2.61 KB)
📄 getmntinfo.3(3.1 KB)
📄 getmntinfo.c(2.57 KB)
📄 getnetgrent.3(4.02 KB)
📄 getnetgrent.c(24.86 KB)
📄 getosreldate.3(2.48 KB)
📄 getosreldate.c(2.09 KB)
📄 getpagesize.3(2.17 KB)
📄 getpagesize.c(2.46 KB)
📄 getpagesizes.3(2.94 KB)
📄 getpagesizes.c(2.99 KB)
📄 getpass.3(3 KB)
📄 getpeereid.3(3.36 KB)
📄 getpeereid.c(1.95 KB)
📄 getprogname.3(3.1 KB)
📄 getprogname.c(249 B)
📄 getpwent.3(7.67 KB)
📄 getpwent.c(44.7 KB)
📄 getttyent.3(5.75 KB)
📄 getttyent.c(6.7 KB)
📄 getusershell.3(2.86 KB)
📄 getusershell.c(5.74 KB)
📄 getutxent.3(11.32 KB)
📄 getutxent.c(4.89 KB)
📄 getvfsbyname.3(3.44 KB)
📄 getvfsbyname.c(3.1 KB)
📄 glob-compat11.c(25.67 KB)
📄 glob-compat11.h(2.8 KB)
📄 glob.3(10.79 KB)
📄 glob.c(26.49 KB)
📄 initgroups.3(2.62 KB)
📄 initgroups.c(2.33 KB)
📄 isatty.c(1.84 KB)
📄 isgreater.3(2.86 KB)
📄 isinf.c(2.14 KB)
📄 isnan.c(2.36 KB)
📄 jrand48.c(662 B)
📄 lcong48.c(832 B)
📄 ldexp.3(2.47 KB)
📄 ldexp.c(2.89 KB)
📄 libc_dlopen.c(1.88 KB)
📄 lockf.3(7.27 KB)
📄 lockf.c(2.55 KB)
📄 lrand48.c(670 B)
📄 makecontext.3(4.25 KB)
📄 memalign.c(1.63 KB)
📄 modf.3(2.63 KB)
📄 modf.c(2.95 KB)
📄 mrand48.c(709 B)
📄 nftw-compat11.c(2.91 KB)
📄 nftw.c(2.71 KB)
📄 nice.3(2.92 KB)
📄 nice.c(2.14 KB)
📄 nlist.3(2.55 KB)
📄 nlist.c(7.54 KB)
📄 nrand48.c(628 B)
📄 opendir.c(8.52 KB)
📄 pause.3(2.36 KB)
📄 pause.c(2.01 KB)
📄 pmadvise.c(425 B)
📄 popen.3(4.86 KB)
📄 popen.c(6 KB)
📄 posix_spawn.3(14.35 KB)
📄 posix_spawn.c(14.04 KB)
📄 posix_spawn_file_actions_addopen.3(6.28 KB)
📄 posix_spawn_file_actions_init.3(3.78 KB)
📄 posix_spawnattr_getflags.3(3.81 KB)
📄 posix_spawnattr_getpgroup.3(3.45 KB)
📄 posix_spawnattr_getschedparam.3(3.69 KB)
📄 posix_spawnattr_getschedpolicy.3(3.63 KB)
📄 posix_spawnattr_getsigdefault.3(3.65 KB)
📄 posix_spawnattr_getsigmask.3(3.56 KB)
📄 posix_spawnattr_init.3(4.09 KB)
📄 psignal.3(3.18 KB)
📄 psignal.c(2.22 KB)
📄 pututxline.c(7.34 KB)
📄 pw_scan.c(6.3 KB)
📄 pw_scan.h(1.8 KB)
📄 raise.3(2.31 KB)
📄 raise.c(1.96 KB)
📄 rand48.3(4.56 KB)
📄 rand48.h(811 B)
📄 readdir-compat11.c(3.63 KB)
📄 readdir.c(3.91 KB)
📄 readpassphrase.3(4.77 KB)
📄 readpassphrase.c(5.65 KB)
📄 recvmmsg.c(2.83 KB)
📄 rewinddir.c(2.29 KB)
📄 rfork_thread.3(2.7 KB)
📄 scandir-compat11.c(4.89 KB)
📄 scandir.3(3.86 KB)
📄 scandir.c(4.8 KB)
📄 scandir_b.c(1.38 KB)
📄 seed48.c(1 KB)
📄 seekdir.c(2.17 KB)
📄 sem.c(11.4 KB)
📄 sem_destroy.3(2.51 KB)
📄 sem_getvalue.3(2.56 KB)
📄 sem_init.3(2.81 KB)
📄 sem_new.c(9.95 KB)
📄 sem_open.3(5.37 KB)
📄 sem_post.3(2.45 KB)
📄 sem_timedwait.3(5 KB)
📄 sem_wait.3(2.73 KB)
📄 semctl.c(2.67 KB)
📄 sendmmsg.c(2.1 KB)
📄 setdomainname.c(1.97 KB)
📄 sethostname.c(1.96 KB)
📄 setjmp.3(4.48 KB)
📄 setjmperr.c(2.11 KB)
📄 setmode.3(3.56 KB)
📄 setmode.c(11.38 KB)
📄 setproctitle.3(3.54 KB)
📄 setproctitle.c(4.87 KB)
📄 setprogname.c(273 B)
📄 siginterrupt.3(3.74 KB)
📄 siginterrupt.c(2.29 KB)
📄 siglist.c(3.49 KB)
📄 signal.3(9.11 KB)
📄 signal.c(2.17 KB)
📄 sigsetops.3(4.15 KB)
📄 sigsetops.c(3.04 KB)
📄 sleep.3(2.88 KB)
📄 sleep.c(2.61 KB)
📄 srand48.c(859 B)
📄 statvfs.3(4.96 KB)
📄 statvfs.c(3.82 KB)
📄 stringlist.3(3.14 KB)
📄 stringlist.c(2.74 KB)
📄 strtofflags.3(2.96 KB)
📄 strtofflags.c(4.78 KB)
📄 sysconf.3(8.75 KB)
📄 sysconf.c(15.62 KB)
📄 sysctl.3(28.37 KB)
📄 sysctl.c(5.35 KB)
📄 sysctlbyname.c(1.81 KB)
📄 sysctlnametomib.c(2.14 KB)
📄 syslog.3(7.35 KB)
📄 syslog.c(12.21 KB)
📄 tcgetpgrp.3(2.6 KB)
📄 tcgetsid.3(2.24 KB)
📄 tcgetwinsize.3(4.62 KB)
📄 tcsendbreak.3(4.75 KB)
📄 tcsetattr.3(8.86 KB)
📄 tcsetpgrp.3(3.09 KB)
📄 tcsetsid.3(2.83 KB)
📄 telldir.c(5.62 KB)
📄 telldir.h(3.84 KB)
📄 termios.c(5.63 KB)
📄 time.3(2.94 KB)
📄 time.c(1.93 KB)
📄 times.3(3.62 KB)
📄 times.c(2.49 KB)
📄 timespec_get.3(2.52 KB)
📄 timespec_get.c(1.92 KB)
📄 timezone.3(2.29 KB)
📄 timezone.c(3.94 KB)
📄 tls.c(12.39 KB)
📄 trivial-getcontextx.c(1.97 KB)
📄 ttyname.3(3.39 KB)
📄 ttyname.c(3.24 KB)
📄 ttyslot.c(1.8 KB)
📄 tzset.3(7.41 KB)
📄 ualarm.3(2.88 KB)
📄 ualarm.c(2.33 KB)
📄 ucontext.3(3.57 KB)
📄 ulimit.3(2.8 KB)
📄 ulimit.c(2.25 KB)
📄 uname.3(3.14 KB)
📄 uname.c(1.91 KB)
📄 unvis-compat.c(1.89 KB)
📄 usleep.3(2.75 KB)
📄 usleep.c(2.2 KB)
📄 utime.3(2.74 KB)
📄 utime.c(2 KB)
📄 utxdb.c(4.56 KB)
📄 utxdb.h(2.2 KB)
📄 valloc.3(2.37 KB)
📄 valloc.c(1.85 KB)
📄 wait.c(2.1 KB)
📄 wait3.c(2.13 KB)
📄 waitid.c(2.49 KB)
📄 waitpid.c(2.15 KB)
📄 wordexp.3(5.04 KB)
📄 wordexp.c(10.48 KB)

Editing: wordexp.c

/*-
 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
 *
 * Copyright (c) 2002 Tim J. Robbins.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include "namespace.h"
#include <sys/cdefs.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <errno.h>
#include <fcntl.h>
#include <paths.h>
#include <signal.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <wordexp.h>
#include "un-namespace.h"
#include "libc_private.h"

__FBSDID("$FreeBSD$");

static int	we_askshell(const char *, wordexp_t *, int);
static int	we_check(const char *);

/*
 * wordexp --
 *	Perform shell word expansion on `words' and place the resulting list
 *	of words in `we'. See wordexp(3).
 *
 *	Specified by IEEE Std. 1003.1-2001.
 */
int
wordexp(const char * __restrict words, wordexp_t * __restrict we, int flags)
{
	int error;

if (flags & WRDE_REUSE)
		wordfree(we);
	if ((flags & WRDE_APPEND) == 0) {
		we->we_wordc = 0;
		we->we_wordv = NULL;
		we->we_strings = NULL;
		we->we_nbytes = 0;
	}
	if ((error = we_check(words)) != 0) {
		wordfree(we);
		return (error);
	}
	if ((error = we_askshell(words, we, flags)) != 0) {
		wordfree(we);
		return (error);
	}
	return (0);
}

static size_t
we_read_fully(int fd, char *buffer, size_t len)
{
	size_t done;
	ssize_t nread;

done = 0;
	do {
		nread = _read(fd, buffer + done, len - done);
		if (nread == -1 && errno == EINTR)
			continue;
		if (nread <= 0)
			break;
		done += nread;
	} while (done != len);
	return done;
}

static bool
we_write_fully(int fd, const char *buffer, size_t len)
{
	size_t done;
	ssize_t nwritten;

done = 0;
	do {
		nwritten = _write(fd, buffer + done, len - done);
		if (nwritten == -1 && errno == EINTR)
			continue;
		if (nwritten <= 0)
			return (false);
		done += nwritten;
	} while (done != len);
	return (true);
}

/*
 * we_askshell --
 *	Use the `freebsd_wordexp' /bin/sh builtin function to do most of the
 *	work in expanding the word string. This function is complicated by
 *	memory management.
 */
static int
we_askshell(const char *words, wordexp_t *we, int flags)
{
	int pdesw[2];			/* Pipe for writing words */
	int pdes[2];			/* Pipe for reading output */
	char wfdstr[sizeof(int) * 3 + 1];
	char buf[35];			/* Buffer for byte and word count */
	long nwords, nbytes;		/* Number of words, bytes from child */
	long i;				/* Handy integer */
	size_t sofs;			/* Offset into we->we_strings */
	size_t vofs;			/* Offset into we->we_wordv */
	pid_t pid;			/* Process ID of child */
	pid_t wpid;			/* waitpid return value */
	int status;			/* Child exit status */
	int error;			/* Our return value */
	int serrno;			/* errno to return */
	char *np, *p;			/* Handy pointers */
	char *nstrings;			/* Temporary for realloc() */
	char **nwv;			/* Temporary for realloc() */
	sigset_t newsigblock, oldsigblock;
	const char *ifs;

serrno = errno;
	ifs = getenv("IFS");

if (pipe2(pdesw, O_CLOEXEC) < 0)
		return (WRDE_NOSPACE);	/* XXX */
	snprintf(wfdstr, sizeof(wfdstr), "%d", pdesw[0]);
	if (pipe2(pdes, O_CLOEXEC) < 0) {
		_close(pdesw[0]);
		_close(pdesw[1]);
		return (WRDE_NOSPACE);	/* XXX */
	}
	(void)sigemptyset(&newsigblock);
	(void)sigaddset(&newsigblock, SIGCHLD);
	(void)__libc_sigprocmask(SIG_BLOCK, &newsigblock, &oldsigblock);
	if ((pid = fork()) < 0) {
		serrno = errno;
		_close(pdesw[0]);
		_close(pdesw[1]);
		_close(pdes[0]);
		_close(pdes[1]);
		(void)__libc_sigprocmask(SIG_SETMASK, &oldsigblock, NULL);
		errno = serrno;
		return (WRDE_NOSPACE);	/* XXX */
	}
	else if (pid == 0) {
		/*
		 * We are the child; make /bin/sh expand `words'.
		 */
		(void)__libc_sigprocmask(SIG_SETMASK, &oldsigblock, NULL);
		if ((pdes[1] != STDOUT_FILENO ?
		    _dup2(pdes[1], STDOUT_FILENO) :
		    _fcntl(pdes[1], F_SETFD, 0)) < 0)
			_exit(1);
		if (_fcntl(pdesw[0], F_SETFD, 0) < 0)
			_exit(1);
		execl(_PATH_BSHELL, "sh", flags & WRDE_UNDEF ? "-u" : "+u",
		    "-c", "IFS=$1;eval \"$2\";"
		    "freebsd_wordexp -f \"$3\" ${4:+\"$4\"}",
		    "",
		    ifs != NULL ? ifs : " \t\n",
		    flags & WRDE_SHOWERR ? "" : "exec 2>/dev/null",
		    wfdstr,
		    flags & WRDE_NOCMD ? "-p" : "",
		    (char *)NULL);
		_exit(1);
	}

/*
	 * We are the parent; write the words.
	 */
	_close(pdes[1]);
	_close(pdesw[0]);
	if (!we_write_fully(pdesw[1], words, strlen(words))) {
		_close(pdesw[1]);
		error = WRDE_SYNTAX;
		goto cleanup;
	}
	_close(pdesw[1]);
	/*
	 * Read the output of the shell wordexp function,
	 * which is a byte indicating that the words were parsed successfully,
	 * a 64-bit hexadecimal word count, a dummy byte, a 64-bit hexadecimal
	 * byte count (not including terminating null bytes), followed by the
	 * expanded words separated by nulls.
	 */
	switch (we_read_fully(pdes[0], buf, 34)) {
	case 1:
		error = buf[0] == 'C' ? WRDE_CMDSUB : WRDE_BADVAL;
		serrno = errno;
		goto cleanup;
	case 34:
		break;
	default:
		error = WRDE_SYNTAX;
		serrno = errno;
		goto cleanup;
	}
	buf[17] = '\0';
	nwords = strtol(buf + 1, NULL, 16);
	buf[34] = '\0';
	nbytes = strtol(buf + 18, NULL, 16) + nwords;

/*
	 * Allocate or reallocate (when flags & WRDE_APPEND) the word vector
	 * and string storage buffers for the expanded words we're about to
	 * read from the child.
	 */
	sofs = we->we_nbytes;
	vofs = we->we_wordc;
	if ((flags & (WRDE_DOOFFS|WRDE_APPEND)) == (WRDE_DOOFFS|WRDE_APPEND))
		vofs += we->we_offs;
	we->we_wordc += nwords;
	we->we_nbytes += nbytes;
	if ((nwv = reallocarray(we->we_wordv, (we->we_wordc + 1 +
	    (flags & WRDE_DOOFFS ? we->we_offs : 0)),
	    sizeof(char *))) == NULL) {
		error = WRDE_NOSPACE;
		goto cleanup;
	}
	we->we_wordv = nwv;
	if ((nstrings = realloc(we->we_strings, we->we_nbytes)) == NULL) {
		error = WRDE_NOSPACE;
		goto cleanup;
	}
	for (i = 0; i < vofs; i++)
		if (we->we_wordv[i] != NULL)
			we->we_wordv[i] += nstrings - we->we_strings;
	we->we_strings = nstrings;

if (we_read_fully(pdes[0], we->we_strings + sofs, nbytes) != nbytes) {
		error = WRDE_NOSPACE; /* abort for unknown reason */
		serrno = errno;
		goto cleanup;
	}

error = 0;
cleanup:
	_close(pdes[0]);
	do
		wpid = _waitpid(pid, &status, 0);
	while (wpid < 0 && errno == EINTR);
	(void)__libc_sigprocmask(SIG_SETMASK, &oldsigblock, NULL);
	if (error != 0) {
		errno = serrno;
		return (error);
	}
	if (wpid < 0 || !WIFEXITED(status) || WEXITSTATUS(status) != 0)
		return (WRDE_NOSPACE); /* abort for unknown reason */

/*
	 * Break the null-terminated expanded word strings out into
	 * the vector.
	 */
	if (vofs == 0 && flags & WRDE_DOOFFS)
		while (vofs < we->we_offs)
			we->we_wordv[vofs++] = NULL;
	p = we->we_strings + sofs;
	while (nwords-- != 0) {
		we->we_wordv[vofs++] = p;
		if ((np = memchr(p, '\0', nbytes)) == NULL)
			return (WRDE_NOSPACE);	/* XXX */
		nbytes -= np - p + 1;
		p = np + 1;
	}
	we->we_wordv[vofs] = NULL;

return (0);
}

/*
 * we_check --
 *	Check that the string contains none of the following unquoted
 *	special characters: <newline> |&;<>(){}
 *	This mainly serves for {} which are normally legal in sh.
 *	It deliberately does not attempt to model full sh syntax.
 */
static int
we_check(const char *words)
{
	char c;
	/* Saw \ or $, possibly not special: */
	bool quote = false, dollar = false;
	/* Saw ', ", ${, ` or $(, possibly not special: */
	bool have_sq = false, have_dq = false, have_par_begin = false;
	bool have_cmd = false;
	/* Definitely saw a ', ", ${, ` or $(, need a closing character: */
	bool need_sq = false, need_dq = false, need_par_end = false;
	bool need_cmd_old = false, need_cmd_new = false;

while ((c = *words++) != '\0') {
		switch (c) {
		case '\\':
			quote = !quote;
			continue;
		case '$':
			if (quote)
				quote = false;
			else
				dollar = !dollar;
			continue;
		case '\'':
			if (!quote && !have_sq && !have_dq)
				need_sq = true;
			else
				need_sq = false;
			have_sq = true;
			break;
		case '"':
			if (!quote && !have_sq && !have_dq)
				need_dq = true;
			else
				need_dq = false;
			have_dq = true;
			break;
		case '`':
			if (!quote && !have_sq && !have_cmd)
				need_cmd_old = true;
			else
				need_cmd_old = false;
			have_cmd = true;
			break;
		case '{':
			if (!quote && !dollar && !have_sq && !have_dq &&
			    !have_cmd)
				return (WRDE_BADCHAR);
			if (dollar) {
				if (!quote && !have_sq)
					need_par_end = true;
				have_par_begin = true;
			}
			break;
		case '}':
			if (!quote && !have_sq && !have_dq && !have_par_begin &&
			    !have_cmd)
				return (WRDE_BADCHAR);
			need_par_end = false;
			break;
		case '(':
			if (!quote && !dollar && !have_sq && !have_dq &&
			    !have_cmd)
				return (WRDE_BADCHAR);
			if (dollar) {
				if (!quote && !have_sq)
					need_cmd_new = true;
				have_cmd = true;
			}
			break;
		case ')':
			if (!quote && !have_sq && !have_dq && !have_cmd)
				return (WRDE_BADCHAR);
			need_cmd_new = false;
			break;
		case '|': case '&': case ';': case '<': case '>': case '\n':
			if (!quote && !have_sq && !have_dq && !have_cmd)
				return (WRDE_BADCHAR);
			break;
		default:
			break;
		}
		quote = dollar = false;
	}
	if (quote || dollar || need_sq || need_dq || need_par_end ||
	    need_cmd_old || need_cmd_new)
		return (WRDE_SYNTAX);

return (0);
}

/*
 * wordfree --
 *	Free the result of wordexp(). See wordexp(3).
 *
 *	Specified by IEEE Std. 1003.1-2001.
 */
void
wordfree(wordexp_t *we)
{

if (we == NULL)
		return;
	free(we->we_wordv);
	free(we->we_strings);
	we->we_wordv = NULL;
	we->we_strings = NULL;
	we->we_nbytes = 0;
	we->we_wordc = 0;
}

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