There is important information about booting non-ack images in docs/UPDATING. ack/aout-format images can't be built any more, and booting clang/ELF-format ones is a little different. Updating to the new boot monitor is recommended. Changes in this commit: . drop boot monitor -> allowing dropping ack support . facility to copy ELF boot files to /boot so that old boot monitor can still boot fairly easily, see UPDATING . no more ack-format libraries -> single-case libraries . some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases . drop several ack toolchain commands, but not all support commands (e.g. aal is gone but acksize is not yet). . a few libc files moved to netbsd libc dir . new /bin/date as minix date used code in libc/ . test compile fix . harmonize includes . /usr/lib is no longer special: without ack, /usr/lib plays no kind of special bootstrapping role any more and bootstrapping is done exclusively through packages, so releases depend even less on the state of the machine making them now. . rename nbsd_lib* to lib* . reduce mtree
346 lines
8.8 KiB
C
346 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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