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Add wordexp(3). The wordexp function performs shell-style word expansions.

Browse Source 
This implementation is wrapper around the undocumented wordexp sh(1)
built-in command.

From FreeBSD.
Provided in PR lib/26123.
Approved by kleink@.
This commit is contained in:
seb 2004-07-13 15:42:03 +00:00
parent cf788c3115
commit 2f8bbc118e
6 changed files with 662 additions and 6 deletions
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5
distrib/sets/lists/comp/mi
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@ -1,4 +1,4 @@
# $NetBSD: mi,v 1.713 2004/07/10 13:49:09 junyoung Exp $
# $NetBSD: mi,v 1.714 2004/07/13 15:42:03 seb Exp $
./etc/mtree/set.comp comp-sys-root
./usr/bin/addr2line comp-debug-bin bfd
./usr/bin/ar comp-util-bin bfd
@ -1507,6 +1507,7 @@
./usr/include/vm/vnode_pager.h comp-obsolete obsolete
./usr/include/wchar.h comp-c-include
./usr/include/wctype.h comp-c-include
./usr/include/wordexp.h comp-c-include
./usr/include/zconf.h comp-c-include
./usr/include/zlib.h comp-c-include
./usr/lib/crt0.o comp-c-lib
@ -4510,6 +4511,7 @@
./usr/share/man/cat3/wmemset.0 comp-c-catman .cat
./usr/share/man/cat3/wmove.0 comp-c-catman .cat
./usr/share/man/cat3/wnoutrefresh.0 comp-c-catman .cat
./usr/share/man/cat3/wordexp.0 comp-c-catman .cat
./usr/share/man/cat3/wprintw.0 comp-c-catman .cat
./usr/share/man/cat3/wrefresh.0 comp-c-catman .cat
./usr/share/man/cat3/wresize.0 comp-c-catman .cat
@ -8238,6 +8240,7 @@
./usr/share/man/man3/wmemset.3 comp-c-man .man
./usr/share/man/man3/wmove.3 comp-c-man .man
./usr/share/man/man3/wnoutrefresh.3 comp-c-man .man
./usr/share/man/man3/wordexp.3 comp-c-man .man
./usr/share/man/man3/wprintw.3 comp-c-man .man
./usr/share/man/man3/wrefresh.3 comp-c-man .man
./usr/share/man/man3/wresize.3 comp-c-man .man

4
include/Makefile
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@ -1,4 +1,4 @@
# $NetBSD: Makefile,v 1.116 2004/05/21 02:27:35 christos Exp $
# $NetBSD: Makefile,v 1.117 2004/07/13 15:42:03 seb Exp $
# @(#)Makefile 8.2 (Berkeley) 1/4/94
# Doing a make includes builds /usr/include
@ -20,7 +20,7 @@ INCS= a.out.h ar.h assert.h bitstring.h bm.h cpio.h ctype.h db.h dirent.h \
sgtty.h signal.h stab.h stddef.h stdio.h stdlib.h string.h \
strings.h stringlist.h struct.h sysexits.h tar.h threadlib.h time.h \
ttyent.h tzfile.h ucontext.h ulimit.h unistd.h util.h utime.h utmp.h \
utmpx.h varargs.h vis.h wchar.h wctype.h
utmpx.h varargs.h vis.h wchar.h wctype.h wordexp.h
INCS+= arpa/ftp.h arpa/inet.h arpa/nameser.h arpa/nameser_compat.h \
arpa/telnet.h arpa/tftp.h
INCS+= protocols/dumprestore.h protocols/routed.h protocols/rwhod.h \

81
include/wordexp.h Normal file
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@ -0,0 +1,81 @@
/* $NetBSD: wordexp.h,v 1.1 2004/07/13 15:42:03 seb Exp $ */
/*-
* 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.
*
* $FreeBSD: /repoman/r/ncvs/src/include/wordexp.h,v 1.4 2003/01/03 12:03:38 tjr Exp $
*/
#ifndef _WORDEXP_H_
#define _WORDEXP_H_
#include <sys/cdefs.h>
#include <sys/featuretest.h>
#include <machine/ansi.h>
#ifdef _BSD_SIZE_T_
typedef _BSD_SIZE_T_ size_t;
#undef _BSD_SIZE_T_
#endif
typedef struct {
size_t we_wordc; /* count of words matched */
char **we_wordv; /* pointer to list of words */
size_t we_offs; /* slots to reserve in we_wordv */
/* following are internals */
char *we_strings; /* storage for wordv strings */
size_t we_nbytes; /* size of we_strings */
} wordexp_t;
/*
* Flags for wordexp().
*/
#define WRDE_APPEND 0x1 /* append to previously generated */
#define WRDE_DOOFFS 0x2 /* we_offs member is valid */
#define WRDE_NOCMD 0x4 /* disallow command substitution */
#define WRDE_REUSE 0x8 /* reuse wordexp_t */
#define WRDE_SHOWERR 0x10 /* don't redirect stderr to /dev/null */
#define WRDE_UNDEF 0x20 /* disallow undefined shell vars */
/*
* Return values from wordexp().
*/
#define WRDE_BADCHAR 1 /* unquoted special character */
#define WRDE_BADVAL 2 /* undefined variable */
#define WRDE_CMDSUB 3 /* command substitution not allowed */
#define WRDE_NOSPACE 4 /* no memory for result */
#if (_XOPEN_SOURCE - 0) >= 4 || defined(_NETBSD_SOURCE)
#define WRDE_NOSYS 5 /* obsolete, reserved */
#endif
#define WRDE_SYNTAX 6 /* shell syntax error */
#define WRDE_ERRNO 7 /* other errors see errno */
__BEGIN_DECLS
int wordexp(const char * __restrict, wordexp_t * __restrict, int);
void wordfree(wordexp_t *);
__END_DECLS
#endif /* !_WORDEXP_H_ */

7
lib/libc/gen/Makefile.inc
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@ -1,4 +1,4 @@
# $NetBSD: Makefile.inc,v 1.133 2004/05/31 06:51:59 itojun Exp $
# $NetBSD: Makefile.inc,v 1.134 2004/07/13 15:42:03 seb Exp $
# from: @(#)Makefile.inc 8.6 (Berkeley) 5/4/95
# gen sources
@ -28,7 +28,7 @@ SRCS+= _errno.c alarm.c arc4random.c assert.c basename.c clock.c closedir.c \
times.c timezone.c toascii.c tolower_.c ttyname.c ttyslot.c \
toupper_.c ualarm.c ulimit.c uname.c unvis.c usleep.c utime.c utmp.c \
utmpx.c valloc.c vis.c wait.c wait3.c waitpid.c warn.c warnx.c \
vwarn.c vwarnx.c verr.c verrx.c
vwarn.c vwarnx.c verr.c verrx.c wordexp.c
# indirect reference stubs, to be removed soon.
SRCS+= _err.c _errx.c _sys_errlist.c _sys_nerr.c _sys_siglist.c \
@ -63,7 +63,8 @@ MAN+= alarm.3 arc4random.3 basename.3 bswap.3 clock.3 closefrom.3 confstr.3 \
signal.3 signbit.3 sigrelse.3 sigset.3 sigsetops.3 sleep.3 \
stringlist.3 sysconf.3 sysctl.3 syslog.3 time.3 times.3 \
timezone.3 toascii.3 tolower.3 toupper.3 ttyname.3 \
ualarm.3 ulimit.3 uname.3 unvis.3 usleep.3 utime.3 valloc.3 vis.3
ualarm.3 ulimit.3 uname.3 unvis.3 usleep.3 utime.3 valloc.3 vis.3 \
wordexp.3
MLINKS+=bswap.3 bswap16.3 bswap.3 bswap32.3 bswap.3 bswap64.3
MLINKS+=directory.3 closedir.3 directory.3 dirfd.3 directory.3 opendir.3 \

226
lib/libc/gen/wordexp.3 Normal file
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@ -0,0 +1,226 @@
.\" $NetBSD: wordexp.3,v 1.1 2004/07/13 15:42:03 seb Exp $
.\"
.\" 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.
.\"
.\" $FreeBSD: /repoman/r/ncvs/src/lib/libc/gen/wordexp.3,v 1.6 2003/09/08 19:57:14 ru Exp $
.\"
.Dd July 13, 2004
.Dt WORDEXP 3
.Os
.Sh NAME
.Nm wordexp
.Nd "perform shell-style word expansions"
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In wordexp.h
.Ft int
.Fn wordexp "const char * restrict words" "wordexp_t * restrict pwordexp" "int flags"
.Ft void
.Fn wordfree "wordexp_t *pwordexp"
.Sh DESCRIPTION
The
.Fn wordexp
function performs shell-style word expansion on
.Fa words
and places the list of expanded words into the structure pointed to by
.Fa pwordexp .
.Pp
The
.Fa flags
argument is the bitwise inclusive OR of any of the following constants:
.Bl -tag -width ".Dv WRDE_SHOWERR"
.It Dv WRDE_APPEND
Append the words to those generated by a previous call to
.Fn wordexp .
.It Dv WRDE_DOOFFS
As many
.Dv NULL
pointers as are specified by the
.Va we_offs
member of
.Fa we
are added to the front of
.Va we_wordv .
.It Dv WRDE_NOCMD
Disallow command substitution in
.Fa words .
See the note in
.Sx BUGS
before using this.
.It Dv WRDE_REUSE
The
.Fa we
argument was passed to a previous successful call to
.Fn wordexp
but has not been passed to
.Fn wordfree .
The implementation may reuse the space allocated to it.
.It Dv WRDE_SHOWERR
Do not redirect shell error messages to
.Pa /dev/null .
.It Dv WRDE_UNDEF
Report error on an attempt to expand an undefined shell variable.
.El
.Pp
The structure type
.Nm wordexp_t
includes the following members:
.Bd -literal -offset indent
size_t we_wordc
char **we_wordv
size_t we_offs
.Ed
.Pp
The
.Fa we_wordc
member is the count of generated words.
.Pp
The
.Fa we_wordv
member points to a list of pointers to expanded words.
.Pp
The
.Fa we_offs
member is the number of slots to reserve at the beginning of the
.Fa we_wordv
member.
.Pp
It is the caller's responsibility to allocate the storage pointed to by
.Fa pwordexp .
The
.Fn wordexp
function allocates other space as needed, including memory
pointed to by the
.Fa we_wordv
member.
.Pp
The
.Fn wordfree
function frees the memory allocated by
.Fn wordexp .
.Sh IMPLEMENTATION NOTES
The
.Fn wordexp
function is implemented as a wrapper around the undocumented
.Ic wordexp
shell built-in command.
.Sh RETURN VALUES
The
.Fn wordexp
function returns zero if successful, otherwise it returns one of the following
error codes:
.Bl -tag -width ".Dv WRDE_NOSPACE"
.It Dv WRDE_BADCHAR
The
.Fa words
argument contains one of the following unquoted characters:
.Aq newline ,
.Ql | ,
.Ql \*[Am] ,
.Ql \&; ,
.Ql \*[Lt] ,
.Ql \*[Gt] ,
.Ql \&( ,
.Ql \&) ,
.Ql { ,
.Ql } .
.It Dv WRDE_BADVAL
An attempt was made to expand an undefined shell variable and
.Dv WRDE_UNDEF
is set in
.Fa flags .
.It Dv WRDE_CMDSUB
An attempt was made to use command substitution and
.Dv WRDE_NOCMD
is set in
.Fa flags .
.It Dv WRDE_NOSPACE
Not enough memory to store the result.
.It Dv WRDE_SYNTAX
Shell syntax error in
.Fa words .
.It Dv WRDE_ERRNO
An internal error occured and
.Va errno
is set to indicate the error.
.El
.Pp
The
.Fn wordfree
function returns no value.
.Sh ENVIRONMENT
.Bl -tag -width ".Ev IFS"
.It Ev IFS
Field separator.
.El
.Sh EXAMPLES
Invoke the editor on all
.Pa .c
files in the current directory
and
.Pa /etc/motd
(error checking omitted):
.Bd -literal -offset indent
wordexp_t we;
wordexp("${EDITOR:-vi} *.c /etc/motd", *[Am]we, 0);
execvp(we-\*[Gt]we_wordv[0], we-\*[Gt]we_wordv);
.Ed
.Sh DIAGNOSTICS
Diagnostic messages from the shell are written to the standard error output
if
.Dv WRDE_SHOWERR
is set in
.Fa flags .
.Sh SEE ALSO
.Xr sh 1 ,
.Xr fnmatch 3 ,
.Xr glob 3 ,
.Xr popen 3 ,
.Xr system 3
.Sh STANDARDS
The
.Fn wordexp
and
.Fn wordfree
functions conform to
.St -p1003.1-2001 .
Their first release was in
.St -p1003.2-92 .
The return value
.Dv WRDE_ERRNO
is an extension.
.Sh BUGS
Do not pass untrusted user data to
.Fn wordexp ,
regardless of whether the
.Dv WRDE_NOCMD
flag is set.
The
.Fn wordexp
function attempts to detect input that would cause commands to be
executed before passing it to the shell
but it does not use the same parser so it may be fooled.

345
lib/libc/gen/wordexp.c Normal file
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@ -0,0 +1,345 @@
/* $NetBSD: wordexp.c,v 1.1 2004/07/13 15:42:03 seb Exp $ */
/*-
* 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 <assert.h>
#include <sys/wait.h>
#include <fcntl.h>
#include <paths.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <wordexp.h>
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
__FBSDID("$FreeBSD: /repoman/r/ncvs/src/lib/libc/gen/wordexp.c,v 1.5 2004/04/09 11:32:32 tjr Exp $");
#else
__RCSID("$NetBSD: wordexp.c,v 1.1 2004/07/13 15:42:03 seb Exp $");
#endif
#endif /* LIBC_SCCS and not lint */
static int we_askshell(const char *, wordexp_t *, int);
static int we_check(const char *, int);
/*
* wordexp --
* Perform shell word expansion on `words' and place the resulting list
* of words in `we'. See wordexp(3).
*
*/
int
wordexp(const char * __restrict words, wordexp_t * __restrict we, int flags)
{
int error;
_DIAGASSERT(we != NULL);
_DIAGASSERT(words != NULL);
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, flags)) != 0) {
wordfree(we);
return (error);
}
if ((error = we_askshell(words, we, flags)) != 0) {
wordfree(we);
return (error);
}
return (0);
}
/*
* we_askshell --
* Use the `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 pdes[2]; /* Pipe to child */
size_t nwords, nbytes; /* Number of words, bytes from child */
int 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 */
int status; /* Child exit status */
char *ifs; /* IFS env. var. */
char *np, *p; /* Handy pointers */
char *nstrings; /* Temporary for realloc() */
char **nwv; /* Temporary for realloc() */
FILE *fp; /* Stream to read pipe */
extern char **environ;
char *cmd;
if ((ifs = getenv("IFS")) == NULL)
ifs = " \t\n";
if (asprintf(&cmd, "wordexp%c%s\n", *ifs, words) < 0)
return (WRDE_NOSPACE);
if (pipe(pdes) < 0) {
free(cmd);
return (WRDE_ERRNO);
}
if ((fp = fdopen(pdes[0], "r")) == NULL) {
free(cmd);
return (WRDE_ERRNO);
}
if ((pid = fork()) < 0) {
free(cmd);
fclose(fp);
close(pdes[1]);
return (WRDE_ERRNO);
}
else if (pid == 0) {
/*
* We are the child; just get /bin/sh to run the wordexp
* builtin on `words'.
*/
int devnull;
close(pdes[0]);
if (pdes[1] != STDOUT_FILENO) {
if (dup2(pdes[1], STDOUT_FILENO) < 0)
_exit(1);
close(pdes[1]);
}
if ((flags & WRDE_SHOWERR) == 0) {
if ((devnull = open(_PATH_DEVNULL, O_RDWR, 0666)) < 0)
_exit(1);
if (dup2(devnull, STDERR_FILENO) < 0)
_exit(1);
close(devnull);
}
execle(_PATH_BSHELL, "sh", flags & WRDE_UNDEF ? "-u" : "+u",
"-c", cmd, (char *)NULL, environ);
_exit(1);
}
/*
* We are the parent; read the output of the shell wordexp function,
* which is a decimal word count, an null, a decimal byte count,
* (not including terminating null bytes), a null and then followed
* by the expanded words separated by nulls.
*/
free(cmd);
close(pdes[1]);
/* read the word count */
nwords = 0;
while ((i = getc(fp)) != EOF) {
if (i == '\0')
break;
nwords *= 10;
nwords += (i - '0');
}
/* read the byte count */
nbytes = 0;
while ((i = getc(fp)) != EOF) {
if (i == '\0')
break;
nbytes *= 10;
nbytes += (i - '0');
}
if (i == EOF) {
fclose(fp);
waitpid(pid, &status, 0);
return (flags & WRDE_UNDEF ? WRDE_BADVAL : WRDE_SYNTAX);
}
nbytes += 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 = realloc(we->we_wordv, (we->we_wordc + 1 +
(flags & WRDE_DOOFFS ? we->we_offs : 0)) *
sizeof(char *))) == NULL) {
fclose(fp);
waitpid(pid, &status, 0);
return (WRDE_NOSPACE);
}
we->we_wordv = nwv;
if ((nstrings = realloc(we->we_strings, we->we_nbytes)) == NULL) {
fclose(fp);
waitpid(pid, &status, 0);
return (WRDE_NOSPACE);
}
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 (fread(we->we_strings + sofs, sizeof(char), nbytes, fp) != nbytes) {
fclose(fp);
waitpid(pid, &status, 0);
return (flags & WRDE_UNDEF ? WRDE_BADVAL : WRDE_SYNTAX);
}
if (waitpid(pid, &status, 0) < 0 || !WIFEXITED(status) ||
WEXITSTATUS(status) != 0) {
fclose(fp);
return (flags & WRDE_UNDEF ? WRDE_BADVAL : WRDE_SYNTAX);
}
fclose(fp);
/*
* 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> |&;<>(){}
* or command substitutions when WRDE_NOCMD is set in flags.
*/
static int
we_check(const char *words, int flags)
{
char c;
int dquote, level, quote, squote;
quote = squote = dquote = 0;
while ((c = *words++) != '\0') {
switch (c) {
case '\\':
quote ^= 1;
continue;
case '\'':
if (quote + dquote == 0)
squote ^= 1;
break;
case '"':
if (quote + squote == 0)
dquote ^= 1;
break;
case '`':
if (quote + squote == 0 && flags & WRDE_NOCMD)
return (WRDE_CMDSUB);
while ((c = *words++) != '\0' && c != '`')
if (c == '\\' && (c = *words++) == '\0')
break;
if (c == '\0')
return (WRDE_SYNTAX);
break;
case '|': case '&': case ';': case '<': case '>':
case '{': case '}': case '(': case ')': case '\n':
if (quote + squote + dquote == 0)
return (WRDE_BADCHAR);
break;
case '$':
if ((c = *words++) == '\0')
break;
else if (quote + squote == 0 && c == '(') {
if (flags & WRDE_NOCMD && *words != '(')
return (WRDE_CMDSUB);
level = 1;
while ((c = *words++) != '\0') {
if (c == '\\') {
if ((c = *words++) == '\0')
break;
} else if (c == '(')
level++;
else if (c == ')' && --level == 0)
break;
}
if (c == '\0' || level != 0)
return (WRDE_SYNTAX);
} else if (quote + squote == 0 && c == '{') {
level = 1;
while ((c = *words++) != '\0') {
if (c == '\\') {
if ((c = *words++) == '\0')
break;
} else if (c == '{')
level++;
else if (c == '}' && --level == 0)
break;
}
if (c == '\0' || level != 0)
return (WRDE_SYNTAX);
} else
c = *--words;
break;
default:
break;
}
quote = 0;
}
if (quote + squote + dquote != 0)
return (WRDE_SYNTAX);
return (0);
}
/*
* wordfree --
* Free the result of wordexp(). See wordexp(3).
*
*/
void
wordfree(wordexp_t *we)
{
_DIAGASSERT(we != NULL);
free(we->we_wordv);
free(we->we_strings);
we->we_wordv = NULL;
we->we_strings = NULL;
we->we_nbytes = 0;
we->we_wordc = 0;
}