b6cbf7203b
This patch imports the unmodified current version of NetBSD libc. The NetBSD includes are in /nbsd_include, while the libc code itself is split between lib/nbsd_libc and common/lib/libc.
347 lines
8.8 KiB
C
347 lines
8.8 KiB
C
/* $NetBSD: wordexp.c,v 1.3 2009/02/12 04:10:52 lukem Exp $ */
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/*-
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* Copyright (c) 2002 Tim J. Robbins.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "namespace.h"
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#include <sys/cdefs.h>
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#include <sys/types.h>
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#include <assert.h>
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#include <sys/wait.h>
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#include <fcntl.h>
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#include <paths.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <wordexp.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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__FBSDID("$FreeBSD: /repoman/r/ncvs/src/lib/libc/gen/wordexp.c,v 1.5 2004/04/09 11:32:32 tjr Exp $");
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#else
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__RCSID("$NetBSD: wordexp.c,v 1.3 2009/02/12 04:10:52 lukem Exp $");
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#endif
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#endif /* LIBC_SCCS and not lint */
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static int we_askshell(const char *, wordexp_t *, int);
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static int we_check(const char *, int);
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/*
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* wordexp --
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* Perform shell word expansion on `words' and place the resulting list
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* of words in `we'. See wordexp(3).
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*
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*/
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int
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wordexp(const char * __restrict words, wordexp_t * __restrict we, int flags)
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{
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int error;
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_DIAGASSERT(we != NULL);
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_DIAGASSERT(words != NULL);
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if (flags & WRDE_REUSE)
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wordfree(we);
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if ((flags & WRDE_APPEND) == 0) {
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we->we_wordc = 0;
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we->we_wordv = NULL;
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we->we_strings = NULL;
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we->we_nbytes = 0;
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}
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if ((error = we_check(words, flags)) != 0) {
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wordfree(we);
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return (error);
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}
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if ((error = we_askshell(words, we, flags)) != 0) {
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wordfree(we);
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return (error);
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}
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return (0);
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}
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/*
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* we_askshell --
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* Use the `wordexp' /bin/sh builtin function to do most of the work
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* in expanding the word string. This function is complicated by
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* memory management.
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*/
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static int
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we_askshell(const char *words, wordexp_t *we, int flags)
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{
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int pdes[2]; /* Pipe to child */
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size_t nwords, nbytes; /* Number of words, bytes from child */
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int i; /* Handy integer */
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unsigned int ui; /* For array iteration */
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size_t sofs; /* Offset into we->we_strings */
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size_t vofs; /* Offset into we->we_wordv */
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pid_t pid; /* Process ID of child */
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int status; /* Child exit status */
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const char *ifs; /* IFS env. var. */
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char *np, *p; /* Handy pointers */
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char *nstrings; /* Temporary for realloc() */
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char **nwv; /* Temporary for realloc() */
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FILE *fp; /* Stream to read pipe */
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extern char **environ;
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char *cmd;
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if ((ifs = getenv("IFS")) == NULL)
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ifs = " \t\n";
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if (asprintf(&cmd, "wordexp%c%s\n", *ifs, words) < 0)
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return (WRDE_NOSPACE);
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if (pipe(pdes) < 0) {
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free(cmd);
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return (WRDE_ERRNO);
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}
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if ((fp = fdopen(pdes[0], "r")) == NULL) {
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free(cmd);
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return (WRDE_ERRNO);
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}
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if ((pid = fork()) < 0) {
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free(cmd);
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fclose(fp);
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close(pdes[1]);
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return (WRDE_ERRNO);
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}
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else if (pid == 0) {
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/*
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* We are the child; just get /bin/sh to run the wordexp
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* builtin on `words'.
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*/
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int devnull;
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close(pdes[0]);
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if (pdes[1] != STDOUT_FILENO) {
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if (dup2(pdes[1], STDOUT_FILENO) < 0)
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_exit(1);
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close(pdes[1]);
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}
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if ((flags & WRDE_SHOWERR) == 0) {
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if ((devnull = open(_PATH_DEVNULL, O_RDWR, 0666)) < 0)
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_exit(1);
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if (dup2(devnull, STDERR_FILENO) < 0)
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_exit(1);
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close(devnull);
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}
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execle(_PATH_BSHELL, "sh", flags & WRDE_UNDEF ? "-u" : "+u",
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"-c", cmd, (char *)NULL, environ);
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_exit(1);
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}
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/*
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* We are the parent; read the output of the shell wordexp function,
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* which is a decimal word count, an null, a decimal byte count,
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* (not including terminating null bytes), a null and then followed
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* by the expanded words separated by nulls.
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*/
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free(cmd);
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close(pdes[1]);
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/* read the word count */
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nwords = 0;
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while ((i = getc(fp)) != EOF) {
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if (i == '\0')
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break;
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nwords *= 10;
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nwords += (i - '0');
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}
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/* read the byte count */
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nbytes = 0;
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while ((i = getc(fp)) != EOF) {
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if (i == '\0')
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break;
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nbytes *= 10;
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nbytes += (i - '0');
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}
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if (i == EOF) {
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fclose(fp);
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waitpid(pid, &status, 0);
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return (flags & WRDE_UNDEF ? WRDE_BADVAL : WRDE_SYNTAX);
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}
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nbytes += nwords;
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/*
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* Allocate or reallocate (when flags & WRDE_APPEND) the word vector
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* and string storage buffers for the expanded words we're about to
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* read from the child.
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*/
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sofs = we->we_nbytes;
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vofs = we->we_wordc;
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if ((flags & (WRDE_DOOFFS|WRDE_APPEND)) == (WRDE_DOOFFS|WRDE_APPEND))
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vofs += we->we_offs;
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we->we_wordc += nwords;
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we->we_nbytes += nbytes;
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if ((nwv = realloc(we->we_wordv, (we->we_wordc + 1 +
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(flags & WRDE_DOOFFS ? we->we_offs : 0)) *
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sizeof(char *))) == NULL) {
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fclose(fp);
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waitpid(pid, &status, 0);
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return (WRDE_NOSPACE);
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}
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we->we_wordv = nwv;
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if ((nstrings = realloc(we->we_strings, we->we_nbytes)) == NULL) {
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fclose(fp);
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waitpid(pid, &status, 0);
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return (WRDE_NOSPACE);
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}
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for (ui = 0; ui < vofs; ui++)
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if (we->we_wordv[ui] != NULL)
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we->we_wordv[ui] += nstrings - we->we_strings;
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we->we_strings = nstrings;
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if (fread(we->we_strings + sofs, sizeof(char), nbytes, fp) != nbytes) {
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fclose(fp);
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waitpid(pid, &status, 0);
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return (flags & WRDE_UNDEF ? WRDE_BADVAL : WRDE_SYNTAX);
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}
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if (waitpid(pid, &status, 0) < 0 || !WIFEXITED(status) ||
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WEXITSTATUS(status) != 0) {
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fclose(fp);
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return (flags & WRDE_UNDEF ? WRDE_BADVAL : WRDE_SYNTAX);
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}
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fclose(fp);
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/*
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* Break the null-terminated expanded word strings out into
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* the vector.
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*/
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if (vofs == 0 && flags & WRDE_DOOFFS)
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while (vofs < we->we_offs)
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we->we_wordv[vofs++] = NULL;
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p = we->we_strings + sofs;
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while (nwords-- != 0) {
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we->we_wordv[vofs++] = p;
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if ((np = memchr(p, '\0', nbytes)) == NULL)
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return (WRDE_NOSPACE); /* XXX */
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nbytes -= np - p + 1;
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p = np + 1;
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}
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we->we_wordv[vofs] = NULL;
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return (0);
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}
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/*
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* we_check --
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* Check that the string contains none of the following unquoted
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* special characters: <newline> |&;<>(){}
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* or command substitutions when WRDE_NOCMD is set in flags.
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*/
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static int
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we_check(const char *words, int flags)
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{
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char c;
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int dquote, level, quote, squote;
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quote = squote = dquote = 0;
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while ((c = *words++) != '\0') {
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switch (c) {
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case '\\':
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quote ^= 1;
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continue;
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case '\'':
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if (quote + dquote == 0)
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squote ^= 1;
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break;
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case '"':
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if (quote + squote == 0)
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dquote ^= 1;
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break;
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case '`':
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if (quote + squote == 0 && flags & WRDE_NOCMD)
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return (WRDE_CMDSUB);
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while ((c = *words++) != '\0' && c != '`')
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if (c == '\\' && (c = *words++) == '\0')
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break;
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if (c == '\0')
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return (WRDE_SYNTAX);
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break;
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case '|': case '&': case ';': case '<': case '>':
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case '{': case '}': case '(': case ')': case '\n':
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if (quote + squote + dquote == 0)
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return (WRDE_BADCHAR);
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break;
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case '$':
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if ((c = *words++) == '\0')
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break;
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else if (quote + squote == 0 && c == '(') {
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if (flags & WRDE_NOCMD && *words != '(')
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return (WRDE_CMDSUB);
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level = 1;
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while ((c = *words++) != '\0') {
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if (c == '\\') {
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if ((c = *words++) == '\0')
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break;
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} else if (c == '(')
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level++;
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else if (c == ')' && --level == 0)
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break;
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}
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if (c == '\0' || level != 0)
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return (WRDE_SYNTAX);
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} else if (quote + squote == 0 && c == '{') {
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level = 1;
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while ((c = *words++) != '\0') {
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if (c == '\\') {
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if ((c = *words++) == '\0')
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break;
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} else if (c == '{')
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level++;
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else if (c == '}' && --level == 0)
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break;
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}
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if (c == '\0' || level != 0)
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return (WRDE_SYNTAX);
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} else
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c = *--words;
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break;
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default:
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break;
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}
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quote = 0;
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}
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if (quote + squote + dquote != 0)
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return (WRDE_SYNTAX);
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return (0);
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}
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/*
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* wordfree --
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* Free the result of wordexp(). See wordexp(3).
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*
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*/
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void
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wordfree(wordexp_t *we)
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{
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_DIAGASSERT(we != NULL);
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free(we->we_wordv);
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free(we->we_strings);
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we->we_wordv = NULL;
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we->we_strings = NULL;
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we->we_nbytes = 0;
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we->we_wordc = 0;
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}
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