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688903eb3e
* All files with FSF copyright notices: Update copyright dates using scripts/update-copyrights. * locale/programs/charmap-kw.h: Regenerated. * locale/programs/locfile-kw.h: Likewise.
2444 lines
52 KiB
C
2444 lines
52 KiB
C
/* POSIX.2 wordexp implementation.
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Copyright (C) 1997-2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Tim Waugh <tim@cyberelk.demon.co.uk>.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <alloca.h>
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#include <ctype.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <fnmatch.h>
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#include <glob.h>
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#include <libintl.h>
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#include <paths.h>
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#include <pwd.h>
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#include <signal.h>
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#include <stdbool.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 <sys/param.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include <wchar.h>
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#include <wordexp.h>
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#include <kernel-features.h>
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#include <libc-lock.h>
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#include <_itoa.h>
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/* Undefine the following line for the production version. */
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/* #define NDEBUG 1 */
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#include <assert.h>
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/* Get some device information. */
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#include <device-nrs.h>
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/*
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* This is a recursive-descent-style word expansion routine.
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*/
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/* These variables are defined and initialized in the startup code. */
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extern int __libc_argc attribute_hidden;
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extern char **__libc_argv attribute_hidden;
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/* Some forward declarations */
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static int parse_dollars (char **word, size_t *word_length, size_t *max_length,
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const char *words, size_t *offset, int flags,
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wordexp_t *pwordexp, const char *ifs,
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const char *ifs_white, int quoted);
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static int parse_backtick (char **word, size_t *word_length,
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size_t *max_length, const char *words,
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size_t *offset, int flags, wordexp_t *pwordexp,
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const char *ifs, const char *ifs_white);
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static int parse_dquote (char **word, size_t *word_length, size_t *max_length,
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const char *words, size_t *offset, int flags,
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wordexp_t *pwordexp, const char *ifs,
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const char *ifs_white);
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static int eval_expr (char *expr, long int *result);
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/* The w_*() functions manipulate word lists. */
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#define W_CHUNK (100)
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/* Result of w_newword will be ignored if it's the last word. */
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static inline char *
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w_newword (size_t *actlen, size_t *maxlen)
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{
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*actlen = *maxlen = 0;
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return NULL;
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}
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static char *
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w_addchar (char *buffer, size_t *actlen, size_t *maxlen, char ch)
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/* (lengths exclude trailing zero) */
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{
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/* Add a character to the buffer, allocating room for it if needed. */
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if (*actlen == *maxlen)
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{
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char *old_buffer = buffer;
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assert (buffer == NULL || *maxlen != 0);
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*maxlen += W_CHUNK;
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buffer = (char *) realloc (buffer, 1 + *maxlen);
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if (buffer == NULL)
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free (old_buffer);
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}
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if (buffer != NULL)
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{
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buffer[*actlen] = ch;
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buffer[++(*actlen)] = '\0';
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}
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return buffer;
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}
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static char *
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w_addmem (char *buffer, size_t *actlen, size_t *maxlen, const char *str,
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size_t len)
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{
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/* Add a string to the buffer, allocating room for it if needed.
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*/
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if (*actlen + len > *maxlen)
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{
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char *old_buffer = buffer;
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assert (buffer == NULL || *maxlen != 0);
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*maxlen += MAX (2 * len, W_CHUNK);
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buffer = realloc (old_buffer, 1 + *maxlen);
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if (buffer == NULL)
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free (old_buffer);
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}
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if (buffer != NULL)
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{
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*((char *) __mempcpy (&buffer[*actlen], str, len)) = '\0';
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*actlen += len;
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}
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return buffer;
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}
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static char *
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w_addstr (char *buffer, size_t *actlen, size_t *maxlen, const char *str)
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/* (lengths exclude trailing zero) */
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{
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/* Add a string to the buffer, allocating room for it if needed.
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*/
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size_t len;
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assert (str != NULL); /* w_addstr only called from this file */
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len = strlen (str);
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return w_addmem (buffer, actlen, maxlen, str, len);
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}
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static int
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w_addword (wordexp_t *pwordexp, char *word)
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{
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/* Add a word to the wordlist */
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size_t num_p;
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char **new_wordv;
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bool allocated = false;
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/* Internally, NULL acts like "". Convert NULLs to "" before
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* the caller sees them.
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*/
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if (word == NULL)
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{
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word = __strdup ("");
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if (word == NULL)
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goto no_space;
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allocated = true;
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}
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num_p = 2 + pwordexp->we_wordc + pwordexp->we_offs;
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new_wordv = realloc (pwordexp->we_wordv, sizeof (char *) * num_p);
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if (new_wordv != NULL)
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{
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pwordexp->we_wordv = new_wordv;
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pwordexp->we_wordv[pwordexp->we_offs + pwordexp->we_wordc++] = word;
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pwordexp->we_wordv[pwordexp->we_offs + pwordexp->we_wordc] = NULL;
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return 0;
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}
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if (allocated)
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free (word);
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no_space:
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return WRDE_NOSPACE;
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}
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/* The parse_*() functions should leave *offset being the offset in 'words'
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* to the last character processed.
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*/
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static int
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parse_backslash (char **word, size_t *word_length, size_t *max_length,
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const char *words, size_t *offset)
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{
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/* We are poised _at_ a backslash, not in quotes */
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switch (words[1 + *offset])
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{
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case 0:
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/* Backslash is last character of input words */
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return WRDE_SYNTAX;
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case '\n':
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++(*offset);
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break;
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default:
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*word = w_addchar (*word, word_length, max_length, words[1 + *offset]);
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if (*word == NULL)
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return WRDE_NOSPACE;
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++(*offset);
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break;
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}
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return 0;
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}
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static int
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parse_qtd_backslash (char **word, size_t *word_length, size_t *max_length,
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const char *words, size_t *offset)
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{
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/* We are poised _at_ a backslash, inside quotes */
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switch (words[1 + *offset])
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{
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case 0:
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/* Backslash is last character of input words */
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return WRDE_SYNTAX;
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case '\n':
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++(*offset);
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break;
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case '$':
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case '`':
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case '"':
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case '\\':
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*word = w_addchar (*word, word_length, max_length, words[1 + *offset]);
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if (*word == NULL)
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return WRDE_NOSPACE;
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++(*offset);
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break;
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default:
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*word = w_addchar (*word, word_length, max_length, words[*offset]);
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if (*word != NULL)
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*word = w_addchar (*word, word_length, max_length, words[1 + *offset]);
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if (*word == NULL)
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return WRDE_NOSPACE;
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++(*offset);
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break;
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}
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return 0;
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}
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static int
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parse_tilde (char **word, size_t *word_length, size_t *max_length,
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const char *words, size_t *offset, size_t wordc)
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{
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/* We are poised _at_ a tilde */
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size_t i;
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if (*word_length != 0)
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{
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if (!((*word)[*word_length - 1] == '=' && wordc == 0))
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{
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if (!((*word)[*word_length - 1] == ':'
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&& strchr (*word, '=') && wordc == 0))
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{
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*word = w_addchar (*word, word_length, max_length, '~');
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return *word ? 0 : WRDE_NOSPACE;
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}
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}
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}
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for (i = 1 + *offset; words[i]; i++)
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{
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if (words[i] == ':' || words[i] == '/' || words[i] == ' ' ||
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words[i] == '\t' || words[i] == 0 )
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break;
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if (words[i] == '\\')
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{
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*word = w_addchar (*word, word_length, max_length, '~');
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return *word ? 0 : WRDE_NOSPACE;
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}
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}
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if (i == 1 + *offset)
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{
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/* Tilde appears on its own */
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uid_t uid;
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struct passwd pwd, *tpwd;
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int buflen = 1000;
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char* home;
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char* buffer;
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int result;
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/* POSIX.2 says ~ expands to $HOME and if HOME is unset the
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results are unspecified. We do a lookup on the uid if
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HOME is unset. */
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home = getenv ("HOME");
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if (home != NULL)
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{
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*word = w_addstr (*word, word_length, max_length, home);
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if (*word == NULL)
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return WRDE_NOSPACE;
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}
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else
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{
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uid = __getuid ();
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buffer = __alloca (buflen);
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while ((result = __getpwuid_r (uid, &pwd, buffer, buflen, &tpwd)) != 0
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&& errno == ERANGE)
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buffer = extend_alloca (buffer, buflen, buflen + 1000);
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if (result == 0 && tpwd != NULL && pwd.pw_dir != NULL)
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{
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*word = w_addstr (*word, word_length, max_length, pwd.pw_dir);
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if (*word == NULL)
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return WRDE_NOSPACE;
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}
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else
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{
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*word = w_addchar (*word, word_length, max_length, '~');
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if (*word == NULL)
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return WRDE_NOSPACE;
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}
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}
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}
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else
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{
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/* Look up user name in database to get home directory */
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char *user = strndupa (&words[1 + *offset], i - (1 + *offset));
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struct passwd pwd, *tpwd;
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int buflen = 1000;
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char* buffer = __alloca (buflen);
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int result;
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while ((result = __getpwnam_r (user, &pwd, buffer, buflen, &tpwd)) != 0
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&& errno == ERANGE)
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buffer = extend_alloca (buffer, buflen, buflen + 1000);
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if (result == 0 && tpwd != NULL && pwd.pw_dir)
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*word = w_addstr (*word, word_length, max_length, pwd.pw_dir);
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else
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{
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/* (invalid login name) */
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*word = w_addchar (*word, word_length, max_length, '~');
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if (*word != NULL)
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*word = w_addstr (*word, word_length, max_length, user);
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}
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*offset = i - 1;
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}
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return *word ? 0 : WRDE_NOSPACE;
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}
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static int
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do_parse_glob (const char *glob_word, char **word, size_t *word_length,
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size_t *max_length, wordexp_t *pwordexp, const char *ifs,
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const char *ifs_white)
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{
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int error;
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unsigned int match;
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glob_t globbuf;
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error = glob (glob_word, GLOB_NOCHECK, NULL, &globbuf);
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if (error != 0)
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{
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/* We can only run into memory problems. */
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assert (error == GLOB_NOSPACE);
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return WRDE_NOSPACE;
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}
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if (ifs && !*ifs)
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{
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/* No field splitting allowed. */
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assert (globbuf.gl_pathv[0] != NULL);
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*word = w_addstr (*word, word_length, max_length, globbuf.gl_pathv[0]);
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for (match = 1; match < globbuf.gl_pathc && *word != NULL; ++match)
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{
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*word = w_addchar (*word, word_length, max_length, ' ');
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if (*word != NULL)
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*word = w_addstr (*word, word_length, max_length,
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globbuf.gl_pathv[match]);
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}
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globfree (&globbuf);
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return *word ? 0 : WRDE_NOSPACE;
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}
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assert (ifs == NULL || *ifs != '\0');
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if (*word != NULL)
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{
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free (*word);
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*word = w_newword (word_length, max_length);
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}
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|
|
|
for (match = 0; match < globbuf.gl_pathc; ++match)
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{
|
|
char *matching_word = __strdup (globbuf.gl_pathv[match]);
|
|
if (matching_word == NULL || w_addword (pwordexp, matching_word))
|
|
{
|
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globfree (&globbuf);
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|
return WRDE_NOSPACE;
|
|
}
|
|
}
|
|
|
|
globfree (&globbuf);
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|
return 0;
|
|
}
|
|
|
|
static int
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|
parse_glob (char **word, size_t *word_length, size_t *max_length,
|
|
const char *words, size_t *offset, int flags,
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wordexp_t *pwordexp, const char *ifs, const char *ifs_white)
|
|
{
|
|
/* We are poised just after a '*', a '[' or a '?'. */
|
|
int error = WRDE_NOSPACE;
|
|
int quoted = 0; /* 1 if singly-quoted, 2 if doubly */
|
|
size_t i;
|
|
wordexp_t glob_list; /* List of words to glob */
|
|
|
|
glob_list.we_wordc = 0;
|
|
glob_list.we_wordv = NULL;
|
|
glob_list.we_offs = 0;
|
|
for (; words[*offset] != '\0'; ++*offset)
|
|
{
|
|
if (strchr (ifs, words[*offset]) != NULL)
|
|
/* Reached IFS */
|
|
break;
|
|
|
|
/* Sort out quoting */
|
|
if (words[*offset] == '\'')
|
|
{
|
|
if (quoted == 0)
|
|
{
|
|
quoted = 1;
|
|
continue;
|
|
}
|
|
else if (quoted == 1)
|
|
{
|
|
quoted = 0;
|
|
continue;
|
|
}
|
|
}
|
|
else if (words[*offset] == '"')
|
|
{
|
|
if (quoted == 0)
|
|
{
|
|
quoted = 2;
|
|
continue;
|
|
}
|
|
else if (quoted == 2)
|
|
{
|
|
quoted = 0;
|
|
continue;
|
|
}
|
|
}
|
|
|
|
/* Sort out other special characters */
|
|
if (quoted != 1 && words[*offset] == '$')
|
|
{
|
|
error = parse_dollars (word, word_length, max_length, words,
|
|
offset, flags, &glob_list, ifs, ifs_white,
|
|
quoted == 2);
|
|
if (error)
|
|
goto tidy_up;
|
|
|
|
continue;
|
|
}
|
|
else if (words[*offset] == '\\')
|
|
{
|
|
if (quoted)
|
|
error = parse_qtd_backslash (word, word_length, max_length,
|
|
words, offset);
|
|
else
|
|
error = parse_backslash (word, word_length, max_length,
|
|
words, offset);
|
|
|
|
if (error)
|
|
goto tidy_up;
|
|
|
|
continue;
|
|
}
|
|
|
|
*word = w_addchar (*word, word_length, max_length, words[*offset]);
|
|
if (*word == NULL)
|
|
goto tidy_up;
|
|
}
|
|
|
|
/* Don't forget to re-parse the character we stopped at. */
|
|
--*offset;
|
|
|
|
/* Glob the words */
|
|
error = w_addword (&glob_list, *word);
|
|
*word = w_newword (word_length, max_length);
|
|
for (i = 0; error == 0 && i < glob_list.we_wordc; i++)
|
|
error = do_parse_glob (glob_list.we_wordv[i], word, word_length,
|
|
max_length, pwordexp, ifs, ifs_white);
|
|
|
|
/* Now tidy up */
|
|
tidy_up:
|
|
wordfree (&glob_list);
|
|
return error;
|
|
}
|
|
|
|
static int
|
|
parse_squote (char **word, size_t *word_length, size_t *max_length,
|
|
const char *words, size_t *offset)
|
|
{
|
|
/* We are poised just after a single quote */
|
|
for (; words[*offset]; ++(*offset))
|
|
{
|
|
if (words[*offset] != '\'')
|
|
{
|
|
*word = w_addchar (*word, word_length, max_length, words[*offset]);
|
|
if (*word == NULL)
|
|
return WRDE_NOSPACE;
|
|
}
|
|
else return 0;
|
|
}
|
|
|
|
/* Unterminated string */
|
|
return WRDE_SYNTAX;
|
|
}
|
|
|
|
/* Functions to evaluate an arithmetic expression */
|
|
static int
|
|
eval_expr_val (char **expr, long int *result)
|
|
{
|
|
char *digit;
|
|
|
|
/* Skip white space */
|
|
for (digit = *expr; digit && *digit && isspace (*digit); ++digit);
|
|
|
|
if (*digit == '(')
|
|
{
|
|
/* Scan for closing paren */
|
|
for (++digit; **expr && **expr != ')'; ++(*expr));
|
|
|
|
/* Is there one? */
|
|
if (!**expr)
|
|
return WRDE_SYNTAX;
|
|
|
|
*(*expr)++ = 0;
|
|
|
|
if (eval_expr (digit, result))
|
|
return WRDE_SYNTAX;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* POSIX requires that decimal, octal, and hexadecimal constants are
|
|
recognized. Therefore we pass 0 as the third parameter to strtol. */
|
|
*result = strtol (digit, expr, 0);
|
|
if (digit == *expr)
|
|
return WRDE_SYNTAX;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
eval_expr_multdiv (char **expr, long int *result)
|
|
{
|
|
long int arg;
|
|
|
|
/* Read a Value */
|
|
if (eval_expr_val (expr, result) != 0)
|
|
return WRDE_SYNTAX;
|
|
|
|
while (**expr)
|
|
{
|
|
/* Skip white space */
|
|
for (; *expr && **expr && isspace (**expr); ++(*expr));
|
|
|
|
if (**expr == '*')
|
|
{
|
|
++(*expr);
|
|
if (eval_expr_val (expr, &arg) != 0)
|
|
return WRDE_SYNTAX;
|
|
|
|
*result *= arg;
|
|
}
|
|
else if (**expr == '/')
|
|
{
|
|
++(*expr);
|
|
if (eval_expr_val (expr, &arg) != 0)
|
|
return WRDE_SYNTAX;
|
|
|
|
/* Division by zero or integer overflow. */
|
|
if (arg == 0 || (arg == -1 && *result == LONG_MIN))
|
|
return WRDE_SYNTAX;
|
|
|
|
*result /= arg;
|
|
}
|
|
else break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
eval_expr (char *expr, long int *result)
|
|
{
|
|
long int arg;
|
|
|
|
/* Read a Multdiv */
|
|
if (eval_expr_multdiv (&expr, result) != 0)
|
|
return WRDE_SYNTAX;
|
|
|
|
while (*expr)
|
|
{
|
|
/* Skip white space */
|
|
for (; expr && *expr && isspace (*expr); ++expr);
|
|
|
|
if (*expr == '+')
|
|
{
|
|
++expr;
|
|
if (eval_expr_multdiv (&expr, &arg) != 0)
|
|
return WRDE_SYNTAX;
|
|
|
|
*result += arg;
|
|
}
|
|
else if (*expr == '-')
|
|
{
|
|
++expr;
|
|
if (eval_expr_multdiv (&expr, &arg) != 0)
|
|
return WRDE_SYNTAX;
|
|
|
|
*result -= arg;
|
|
}
|
|
else break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
parse_arith (char **word, size_t *word_length, size_t *max_length,
|
|
const char *words, size_t *offset, int flags, int bracket)
|
|
{
|
|
/* We are poised just after "$((" or "$[" */
|
|
int error;
|
|
int paren_depth = 1;
|
|
size_t expr_length;
|
|
size_t expr_maxlen;
|
|
char *expr;
|
|
|
|
expr = w_newword (&expr_length, &expr_maxlen);
|
|
for (; words[*offset]; ++(*offset))
|
|
{
|
|
switch (words[*offset])
|
|
{
|
|
case '$':
|
|
error = parse_dollars (&expr, &expr_length, &expr_maxlen,
|
|
words, offset, flags, NULL, NULL, NULL, 1);
|
|
/* The ``1'' here is to tell parse_dollars not to
|
|
* split the fields.
|
|
*/
|
|
if (error)
|
|
{
|
|
free (expr);
|
|
return error;
|
|
}
|
|
break;
|
|
|
|
case '`':
|
|
(*offset)++;
|
|
error = parse_backtick (&expr, &expr_length, &expr_maxlen,
|
|
words, offset, flags, NULL, NULL, NULL);
|
|
/* The first NULL here is to tell parse_backtick not to
|
|
* split the fields.
|
|
*/
|
|
if (error)
|
|
{
|
|
free (expr);
|
|
return error;
|
|
}
|
|
break;
|
|
|
|
case '\\':
|
|
error = parse_qtd_backslash (&expr, &expr_length, &expr_maxlen,
|
|
words, offset);
|
|
if (error)
|
|
{
|
|
free (expr);
|
|
return error;
|
|
}
|
|
/* I think that a backslash within an
|
|
* arithmetic expansion is bound to
|
|
* cause an error sooner or later anyway though.
|
|
*/
|
|
break;
|
|
|
|
case ')':
|
|
if (--paren_depth == 0)
|
|
{
|
|
char result[21]; /* 21 = ceil(log10(2^64)) + 1 */
|
|
long int numresult = 0;
|
|
long long int convertme;
|
|
|
|
if (bracket || words[1 + *offset] != ')')
|
|
{
|
|
free (expr);
|
|
return WRDE_SYNTAX;
|
|
}
|
|
|
|
++(*offset);
|
|
|
|
/* Go - evaluate. */
|
|
if (*expr && eval_expr (expr, &numresult) != 0)
|
|
{
|
|
free (expr);
|
|
return WRDE_SYNTAX;
|
|
}
|
|
|
|
if (numresult < 0)
|
|
{
|
|
convertme = -numresult;
|
|
*word = w_addchar (*word, word_length, max_length, '-');
|
|
if (!*word)
|
|
{
|
|
free (expr);
|
|
return WRDE_NOSPACE;
|
|
}
|
|
}
|
|
else
|
|
convertme = numresult;
|
|
|
|
result[20] = '\0';
|
|
*word = w_addstr (*word, word_length, max_length,
|
|
_itoa (convertme, &result[20], 10, 0));
|
|
free (expr);
|
|
return *word ? 0 : WRDE_NOSPACE;
|
|
}
|
|
expr = w_addchar (expr, &expr_length, &expr_maxlen, words[*offset]);
|
|
if (expr == NULL)
|
|
return WRDE_NOSPACE;
|
|
|
|
break;
|
|
|
|
case ']':
|
|
if (bracket && paren_depth == 1)
|
|
{
|
|
char result[21]; /* 21 = ceil(log10(2^64)) + 1 */
|
|
long int numresult = 0;
|
|
|
|
/* Go - evaluate. */
|
|
if (*expr && eval_expr (expr, &numresult) != 0)
|
|
{
|
|
free (expr);
|
|
return WRDE_SYNTAX;
|
|
}
|
|
|
|
result[20] = '\0';
|
|
*word = w_addstr (*word, word_length, max_length,
|
|
_itoa_word (numresult, &result[20], 10, 0));
|
|
free (expr);
|
|
return *word ? 0 : WRDE_NOSPACE;
|
|
}
|
|
|
|
free (expr);
|
|
return WRDE_SYNTAX;
|
|
|
|
case '\n':
|
|
case ';':
|
|
case '{':
|
|
case '}':
|
|
free (expr);
|
|
return WRDE_BADCHAR;
|
|
|
|
case '(':
|
|
++paren_depth;
|
|
default:
|
|
expr = w_addchar (expr, &expr_length, &expr_maxlen, words[*offset]);
|
|
if (expr == NULL)
|
|
return WRDE_NOSPACE;
|
|
}
|
|
}
|
|
|
|
/* Premature end */
|
|
free (expr);
|
|
return WRDE_SYNTAX;
|
|
}
|
|
|
|
/* Function called by child process in exec_comm() */
|
|
static inline void
|
|
__attribute__ ((always_inline))
|
|
exec_comm_child (char *comm, int *fildes, int showerr, int noexec)
|
|
{
|
|
const char *args[4] = { _PATH_BSHELL, "-c", comm, NULL };
|
|
|
|
/* Execute the command, or just check syntax? */
|
|
if (noexec)
|
|
args[1] = "-nc";
|
|
|
|
/* Redirect output. */
|
|
if (__glibc_likely (fildes[1] != STDOUT_FILENO))
|
|
{
|
|
__dup2 (fildes[1], STDOUT_FILENO);
|
|
__close (fildes[1]);
|
|
}
|
|
else
|
|
/* Reset the close-on-exec flag (if necessary). */
|
|
__fcntl (fildes[1], F_SETFD, 0);
|
|
|
|
/* Redirect stderr to /dev/null if we have to. */
|
|
if (showerr == 0)
|
|
{
|
|
struct stat64 st;
|
|
int fd;
|
|
__close (STDERR_FILENO);
|
|
fd = __open (_PATH_DEVNULL, O_WRONLY);
|
|
if (fd >= 0 && fd != STDERR_FILENO)
|
|
{
|
|
__dup2 (fd, STDERR_FILENO);
|
|
__close (fd);
|
|
}
|
|
/* Be paranoid. Check that we actually opened the /dev/null
|
|
device. */
|
|
if (__builtin_expect (__fxstat64 (_STAT_VER, STDERR_FILENO, &st), 0) != 0
|
|
|| __builtin_expect (S_ISCHR (st.st_mode), 1) == 0
|
|
#if defined DEV_NULL_MAJOR && defined DEV_NULL_MINOR
|
|
|| st.st_rdev != makedev (DEV_NULL_MAJOR, DEV_NULL_MINOR)
|
|
#endif
|
|
)
|
|
/* It's not the /dev/null device. Stop right here. The
|
|
problem is: how do we stop? We use _exit() with an
|
|
hopefully unusual exit code. */
|
|
_exit (90);
|
|
}
|
|
|
|
/* Make sure the subshell doesn't field-split on our behalf. */
|
|
__unsetenv ("IFS");
|
|
|
|
__close (fildes[0]);
|
|
__execve (_PATH_BSHELL, (char *const *) args, __environ);
|
|
|
|
/* Bad. What now? */
|
|
abort ();
|
|
}
|
|
|
|
/* Function to execute a command and retrieve the results */
|
|
/* pwordexp contains NULL if field-splitting is forbidden */
|
|
static int
|
|
exec_comm (char *comm, char **word, size_t *word_length, size_t *max_length,
|
|
int flags, wordexp_t *pwordexp, const char *ifs,
|
|
const char *ifs_white)
|
|
{
|
|
int fildes[2];
|
|
#define bufsize 128
|
|
int buflen;
|
|
int i;
|
|
int status = 0;
|
|
size_t maxnewlines = 0;
|
|
char buffer[bufsize];
|
|
pid_t pid;
|
|
int noexec = 0;
|
|
|
|
/* Do nothing if command substitution should not succeed. */
|
|
if (flags & WRDE_NOCMD)
|
|
return WRDE_CMDSUB;
|
|
|
|
/* Don't fork() unless necessary */
|
|
if (!comm || !*comm)
|
|
return 0;
|
|
|
|
if (__pipe2 (fildes, O_CLOEXEC) < 0)
|
|
return WRDE_NOSPACE;
|
|
|
|
again:
|
|
if ((pid = __fork ()) < 0)
|
|
{
|
|
/* Bad */
|
|
__close (fildes[0]);
|
|
__close (fildes[1]);
|
|
return WRDE_NOSPACE;
|
|
}
|
|
|
|
if (pid == 0)
|
|
exec_comm_child (comm, fildes, noexec ? 0 : flags & WRDE_SHOWERR, noexec);
|
|
|
|
/* Parent */
|
|
|
|
/* If we are just testing the syntax, only wait. */
|
|
if (noexec)
|
|
return (TEMP_FAILURE_RETRY (__waitpid (pid, &status, 0)) == pid
|
|
&& status != 0) ? WRDE_SYNTAX : 0;
|
|
|
|
__close (fildes[1]);
|
|
fildes[1] = -1;
|
|
|
|
if (!pwordexp)
|
|
/* Quoted - no field splitting */
|
|
{
|
|
while (1)
|
|
{
|
|
if ((buflen = TEMP_FAILURE_RETRY (__read (fildes[0], buffer,
|
|
bufsize))) < 1)
|
|
{
|
|
/* If read returned 0 then the process has closed its
|
|
stdout. Don't use WNOHANG in that case to avoid busy
|
|
looping until the process eventually exits. */
|
|
if (TEMP_FAILURE_RETRY (__waitpid (pid, &status,
|
|
buflen == 0 ? 0 : WNOHANG))
|
|
== 0)
|
|
continue;
|
|
if ((buflen = TEMP_FAILURE_RETRY (__read (fildes[0], buffer,
|
|
bufsize))) < 1)
|
|
break;
|
|
}
|
|
|
|
maxnewlines += buflen;
|
|
|
|
*word = w_addmem (*word, word_length, max_length, buffer, buflen);
|
|
if (*word == NULL)
|
|
goto no_space;
|
|
}
|
|
}
|
|
else
|
|
/* Not quoted - split fields */
|
|
{
|
|
int copying = 0;
|
|
/* 'copying' is:
|
|
* 0 when searching for first character in a field not IFS white space
|
|
* 1 when copying the text of a field
|
|
* 2 when searching for possible non-whitespace IFS
|
|
* 3 when searching for non-newline after copying field
|
|
*/
|
|
|
|
while (1)
|
|
{
|
|
if ((buflen = TEMP_FAILURE_RETRY (__read (fildes[0], buffer,
|
|
bufsize))) < 1)
|
|
{
|
|
/* If read returned 0 then the process has closed its
|
|
stdout. Don't use WNOHANG in that case to avoid busy
|
|
looping until the process eventually exits. */
|
|
if (TEMP_FAILURE_RETRY (__waitpid (pid, &status,
|
|
buflen == 0 ? 0 : WNOHANG))
|
|
== 0)
|
|
continue;
|
|
if ((buflen = TEMP_FAILURE_RETRY (__read (fildes[0], buffer,
|
|
bufsize))) < 1)
|
|
break;
|
|
}
|
|
|
|
for (i = 0; i < buflen; ++i)
|
|
{
|
|
if (strchr (ifs, buffer[i]) != NULL)
|
|
{
|
|
/* Current character is IFS */
|
|
if (strchr (ifs_white, buffer[i]) == NULL)
|
|
{
|
|
/* Current character is IFS but not whitespace */
|
|
if (copying == 2)
|
|
{
|
|
/* current character
|
|
* |
|
|
* V
|
|
* eg: text<space><comma><space>moretext
|
|
*
|
|
* So, strip whitespace IFS (like at the start)
|
|
*/
|
|
copying = 0;
|
|
continue;
|
|
}
|
|
|
|
copying = 0;
|
|
/* fall through and delimit field.. */
|
|
}
|
|
else
|
|
{
|
|
if (buffer[i] == '\n')
|
|
{
|
|
/* Current character is (IFS) newline */
|
|
|
|
/* If copying a field, this is the end of it,
|
|
but maybe all that's left is trailing newlines.
|
|
So start searching for a non-newline. */
|
|
if (copying == 1)
|
|
copying = 3;
|
|
|
|
continue;
|
|
}
|
|
else
|
|
{
|
|
/* Current character is IFS white space, but
|
|
not a newline */
|
|
|
|
/* If not either copying a field or searching
|
|
for non-newline after a field, ignore it */
|
|
if (copying != 1 && copying != 3)
|
|
continue;
|
|
|
|
/* End of field (search for non-ws IFS afterwards) */
|
|
copying = 2;
|
|
}
|
|
}
|
|
|
|
/* First IFS white space (non-newline), or IFS non-whitespace.
|
|
* Delimit the field. Nulls are converted by w_addword. */
|
|
if (w_addword (pwordexp, *word) == WRDE_NOSPACE)
|
|
goto no_space;
|
|
|
|
*word = w_newword (word_length, max_length);
|
|
|
|
maxnewlines = 0;
|
|
/* fall back round the loop.. */
|
|
}
|
|
else
|
|
{
|
|
/* Not IFS character */
|
|
|
|
if (copying == 3)
|
|
{
|
|
/* Nothing but (IFS) newlines since the last field,
|
|
so delimit it here before starting new word */
|
|
if (w_addword (pwordexp, *word) == WRDE_NOSPACE)
|
|
goto no_space;
|
|
|
|
*word = w_newword (word_length, max_length);
|
|
}
|
|
|
|
copying = 1;
|
|
|
|
if (buffer[i] == '\n') /* happens if newline not in IFS */
|
|
maxnewlines++;
|
|
else
|
|
maxnewlines = 0;
|
|
|
|
*word = w_addchar (*word, word_length, max_length,
|
|
buffer[i]);
|
|
if (*word == NULL)
|
|
goto no_space;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Chop off trailing newlines (required by POSIX.2) */
|
|
/* Ensure we don't go back further than the beginning of the
|
|
substitution (i.e. remove maxnewlines bytes at most) */
|
|
while (maxnewlines-- != 0 &&
|
|
*word_length > 0 && (*word)[*word_length - 1] == '\n')
|
|
{
|
|
(*word)[--*word_length] = '\0';
|
|
|
|
/* If the last word was entirely newlines, turn it into a new word
|
|
* which can be ignored if there's nothing following it. */
|
|
if (*word_length == 0)
|
|
{
|
|
free (*word);
|
|
*word = w_newword (word_length, max_length);
|
|
break;
|
|
}
|
|
}
|
|
|
|
__close (fildes[0]);
|
|
fildes[0] = -1;
|
|
|
|
/* Check for syntax error (re-execute but with "-n" flag) */
|
|
if (buflen < 1 && status != 0)
|
|
{
|
|
noexec = 1;
|
|
goto again;
|
|
}
|
|
|
|
return 0;
|
|
|
|
no_space:
|
|
__kill (pid, SIGKILL);
|
|
TEMP_FAILURE_RETRY (__waitpid (pid, NULL, 0));
|
|
__close (fildes[0]);
|
|
return WRDE_NOSPACE;
|
|
}
|
|
|
|
static int
|
|
parse_comm (char **word, size_t *word_length, size_t *max_length,
|
|
const char *words, size_t *offset, int flags, wordexp_t *pwordexp,
|
|
const char *ifs, const char *ifs_white)
|
|
{
|
|
/* We are poised just after "$(" */
|
|
int paren_depth = 1;
|
|
int error = 0;
|
|
int quoted = 0; /* 1 for singly-quoted, 2 for doubly-quoted */
|
|
size_t comm_length;
|
|
size_t comm_maxlen;
|
|
char *comm = w_newword (&comm_length, &comm_maxlen);
|
|
|
|
for (; words[*offset]; ++(*offset))
|
|
{
|
|
switch (words[*offset])
|
|
{
|
|
case '\'':
|
|
if (quoted == 0)
|
|
quoted = 1;
|
|
else if (quoted == 1)
|
|
quoted = 0;
|
|
|
|
break;
|
|
|
|
case '"':
|
|
if (quoted == 0)
|
|
quoted = 2;
|
|
else if (quoted == 2)
|
|
quoted = 0;
|
|
|
|
break;
|
|
|
|
case ')':
|
|
if (!quoted && --paren_depth == 0)
|
|
{
|
|
/* Go -- give script to the shell */
|
|
if (comm)
|
|
{
|
|
#ifdef __libc_ptf_call
|
|
/* We do not want the exec_comm call to be cut short
|
|
by a thread cancellation since cleanup is very
|
|
ugly. Therefore disable cancellation for
|
|
now. */
|
|
// XXX Ideally we do want the thread being cancelable.
|
|
// XXX If demand is there we'll change it.
|
|
int state = PTHREAD_CANCEL_ENABLE;
|
|
__libc_ptf_call (__pthread_setcancelstate,
|
|
(PTHREAD_CANCEL_DISABLE, &state), 0);
|
|
#endif
|
|
|
|
error = exec_comm (comm, word, word_length, max_length,
|
|
flags, pwordexp, ifs, ifs_white);
|
|
|
|
#ifdef __libc_ptf_call
|
|
__libc_ptf_call (__pthread_setcancelstate,
|
|
(state, NULL), 0);
|
|
#endif
|
|
|
|
free (comm);
|
|
}
|
|
|
|
return error;
|
|
}
|
|
|
|
/* This is just part of the script */
|
|
break;
|
|
|
|
case '(':
|
|
if (!quoted)
|
|
++paren_depth;
|
|
}
|
|
|
|
comm = w_addchar (comm, &comm_length, &comm_maxlen, words[*offset]);
|
|
if (comm == NULL)
|
|
return WRDE_NOSPACE;
|
|
}
|
|
|
|
/* Premature end. */
|
|
free (comm);
|
|
|
|
return WRDE_SYNTAX;
|
|
}
|
|
|
|
#define CHAR_IN_SET(ch, char_set) \
|
|
(memchr (char_set "", ch, sizeof (char_set) - 1) != NULL)
|
|
|
|
static int
|
|
parse_param (char **word, size_t *word_length, size_t *max_length,
|
|
const char *words, size_t *offset, int flags, wordexp_t *pwordexp,
|
|
const char *ifs, const char *ifs_white, int quoted)
|
|
{
|
|
/* We are poised just after "$" */
|
|
enum action
|
|
{
|
|
ACT_NONE,
|
|
ACT_RP_SHORT_LEFT = '#',
|
|
ACT_RP_LONG_LEFT = 'L',
|
|
ACT_RP_SHORT_RIGHT = '%',
|
|
ACT_RP_LONG_RIGHT = 'R',
|
|
ACT_NULL_ERROR = '?',
|
|
ACT_NULL_SUBST = '-',
|
|
ACT_NONNULL_SUBST = '+',
|
|
ACT_NULL_ASSIGN = '='
|
|
};
|
|
size_t env_length;
|
|
size_t env_maxlen;
|
|
size_t pat_length;
|
|
size_t pat_maxlen;
|
|
size_t start = *offset;
|
|
char *env;
|
|
char *pattern;
|
|
char *value = NULL;
|
|
enum action action = ACT_NONE;
|
|
int depth = 0;
|
|
int colon_seen = 0;
|
|
int seen_hash = 0;
|
|
int free_value = 0;
|
|
int pattern_is_quoted = 0; /* 1 for singly-quoted, 2 for doubly-quoted */
|
|
int error;
|
|
int special = 0;
|
|
char buffer[21];
|
|
int brace = words[*offset] == '{';
|
|
|
|
env = w_newword (&env_length, &env_maxlen);
|
|
pattern = w_newword (&pat_length, &pat_maxlen);
|
|
|
|
if (brace)
|
|
++*offset;
|
|
|
|
/* First collect the parameter name. */
|
|
|
|
if (words[*offset] == '#')
|
|
{
|
|
seen_hash = 1;
|
|
if (!brace)
|
|
goto envsubst;
|
|
++*offset;
|
|
}
|
|
|
|
if (isalpha (words[*offset]) || words[*offset] == '_')
|
|
{
|
|
/* Normal parameter name. */
|
|
do
|
|
{
|
|
env = w_addchar (env, &env_length, &env_maxlen,
|
|
words[*offset]);
|
|
if (env == NULL)
|
|
goto no_space;
|
|
}
|
|
while (isalnum (words[++*offset]) || words[*offset] == '_');
|
|
}
|
|
else if (isdigit (words[*offset]))
|
|
{
|
|
/* Numeric parameter name. */
|
|
special = 1;
|
|
do
|
|
{
|
|
env = w_addchar (env, &env_length, &env_maxlen,
|
|
words[*offset]);
|
|
if (env == NULL)
|
|
goto no_space;
|
|
if (!brace)
|
|
goto envsubst;
|
|
}
|
|
while (isdigit(words[++*offset]));
|
|
}
|
|
else if (CHAR_IN_SET (words[*offset], "*@$"))
|
|
{
|
|
/* Special parameter. */
|
|
special = 1;
|
|
env = w_addchar (env, &env_length, &env_maxlen,
|
|
words[*offset]);
|
|
if (env == NULL)
|
|
goto no_space;
|
|
++*offset;
|
|
}
|
|
else
|
|
{
|
|
if (brace)
|
|
goto syntax;
|
|
}
|
|
|
|
if (brace)
|
|
{
|
|
/* Check for special action to be applied to the value. */
|
|
switch (words[*offset])
|
|
{
|
|
case '}':
|
|
/* Evaluate. */
|
|
goto envsubst;
|
|
|
|
case '#':
|
|
action = ACT_RP_SHORT_LEFT;
|
|
if (words[1 + *offset] == '#')
|
|
{
|
|
++*offset;
|
|
action = ACT_RP_LONG_LEFT;
|
|
}
|
|
break;
|
|
|
|
case '%':
|
|
action = ACT_RP_SHORT_RIGHT;
|
|
if (words[1 + *offset] == '%')
|
|
{
|
|
++*offset;
|
|
action = ACT_RP_LONG_RIGHT;
|
|
}
|
|
break;
|
|
|
|
case ':':
|
|
if (!CHAR_IN_SET (words[1 + *offset], "-=?+"))
|
|
goto syntax;
|
|
|
|
colon_seen = 1;
|
|
action = words[++*offset];
|
|
break;
|
|
|
|
case '-':
|
|
case '=':
|
|
case '?':
|
|
case '+':
|
|
action = words[*offset];
|
|
break;
|
|
|
|
default:
|
|
goto syntax;
|
|
}
|
|
|
|
/* Now collect the pattern, but don't expand it yet. */
|
|
++*offset;
|
|
for (; words[*offset]; ++(*offset))
|
|
{
|
|
switch (words[*offset])
|
|
{
|
|
case '{':
|
|
if (!pattern_is_quoted)
|
|
++depth;
|
|
break;
|
|
|
|
case '}':
|
|
if (!pattern_is_quoted)
|
|
{
|
|
if (depth == 0)
|
|
goto envsubst;
|
|
--depth;
|
|
}
|
|
break;
|
|
|
|
case '\\':
|
|
if (pattern_is_quoted)
|
|
/* Quoted; treat as normal character. */
|
|
break;
|
|
|
|
/* Otherwise, it's an escape: next character is literal. */
|
|
if (words[++*offset] == '\0')
|
|
goto syntax;
|
|
|
|
pattern = w_addchar (pattern, &pat_length, &pat_maxlen, '\\');
|
|
if (pattern == NULL)
|
|
goto no_space;
|
|
|
|
break;
|
|
|
|
case '\'':
|
|
if (pattern_is_quoted == 0)
|
|
pattern_is_quoted = 1;
|
|
else if (pattern_is_quoted == 1)
|
|
pattern_is_quoted = 0;
|
|
|
|
break;
|
|
|
|
case '"':
|
|
if (pattern_is_quoted == 0)
|
|
pattern_is_quoted = 2;
|
|
else if (pattern_is_quoted == 2)
|
|
pattern_is_quoted = 0;
|
|
|
|
break;
|
|
}
|
|
|
|
pattern = w_addchar (pattern, &pat_length, &pat_maxlen,
|
|
words[*offset]);
|
|
if (pattern == NULL)
|
|
goto no_space;
|
|
}
|
|
}
|
|
|
|
/* End of input string -- remember to reparse the character that we
|
|
* stopped at. */
|
|
--(*offset);
|
|
|
|
envsubst:
|
|
if (words[start] == '{' && words[*offset] != '}')
|
|
goto syntax;
|
|
|
|
if (env == NULL)
|
|
{
|
|
if (seen_hash)
|
|
{
|
|
/* $# expands to the number of positional parameters */
|
|
buffer[20] = '\0';
|
|
value = _itoa_word (__libc_argc - 1, &buffer[20], 10, 0);
|
|
seen_hash = 0;
|
|
}
|
|
else
|
|
{
|
|
/* Just $ on its own */
|
|
*offset = start - 1;
|
|
*word = w_addchar (*word, word_length, max_length, '$');
|
|
return *word ? 0 : WRDE_NOSPACE;
|
|
}
|
|
}
|
|
/* Is it a numeric parameter? */
|
|
else if (isdigit (env[0]))
|
|
{
|
|
int n = atoi (env);
|
|
|
|
if (n >= __libc_argc)
|
|
/* Substitute NULL. */
|
|
value = NULL;
|
|
else
|
|
/* Replace with appropriate positional parameter. */
|
|
value = __libc_argv[n];
|
|
}
|
|
/* Is it a special parameter? */
|
|
else if (special)
|
|
{
|
|
/* Is it `$$'? */
|
|
if (*env == '$')
|
|
{
|
|
buffer[20] = '\0';
|
|
value = _itoa_word (__getpid (), &buffer[20], 10, 0);
|
|
}
|
|
/* Is it `${#*}' or `${#@}'? */
|
|
else if ((*env == '*' || *env == '@') && seen_hash)
|
|
{
|
|
buffer[20] = '\0';
|
|
value = _itoa_word (__libc_argc > 0 ? __libc_argc - 1 : 0,
|
|
&buffer[20], 10, 0);
|
|
*word = w_addstr (*word, word_length, max_length, value);
|
|
free (env);
|
|
free (pattern);
|
|
return *word ? 0 : WRDE_NOSPACE;
|
|
}
|
|
/* Is it `$*' or `$@' (unquoted) ? */
|
|
else if (*env == '*' || (*env == '@' && !quoted))
|
|
{
|
|
size_t plist_len = 0;
|
|
int p;
|
|
char *end;
|
|
|
|
/* Build up value parameter by parameter (copy them) */
|
|
for (p = 1; __libc_argv[p]; ++p)
|
|
plist_len += strlen (__libc_argv[p]) + 1; /* for space */
|
|
value = malloc (plist_len);
|
|
if (value == NULL)
|
|
goto no_space;
|
|
end = value;
|
|
*end = 0;
|
|
for (p = 1; __libc_argv[p]; ++p)
|
|
{
|
|
if (p > 1)
|
|
*end++ = ' ';
|
|
end = __stpcpy (end, __libc_argv[p]);
|
|
}
|
|
|
|
free_value = 1;
|
|
}
|
|
else
|
|
{
|
|
/* Must be a quoted `$@' */
|
|
assert (*env == '@' && quoted);
|
|
|
|
/* Each parameter is a separate word ("$@") */
|
|
if (__libc_argc == 2)
|
|
value = __libc_argv[1];
|
|
else if (__libc_argc > 2)
|
|
{
|
|
int p;
|
|
|
|
/* Append first parameter to current word. */
|
|
value = w_addstr (*word, word_length, max_length,
|
|
__libc_argv[1]);
|
|
if (value == NULL || w_addword (pwordexp, value))
|
|
goto no_space;
|
|
|
|
for (p = 2; __libc_argv[p + 1]; p++)
|
|
{
|
|
char *newword = __strdup (__libc_argv[p]);
|
|
if (newword == NULL || w_addword (pwordexp, newword))
|
|
goto no_space;
|
|
}
|
|
|
|
/* Start a new word with the last parameter. */
|
|
*word = w_newword (word_length, max_length);
|
|
value = __libc_argv[p];
|
|
}
|
|
else
|
|
{
|
|
free (env);
|
|
free (pattern);
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
else
|
|
value = getenv (env);
|
|
|
|
if (value == NULL && (flags & WRDE_UNDEF))
|
|
{
|
|
/* Variable not defined. */
|
|
error = WRDE_BADVAL;
|
|
goto do_error;
|
|
}
|
|
|
|
if (action != ACT_NONE)
|
|
{
|
|
int expand_pattern = 0;
|
|
|
|
/* First, find out if we need to expand pattern (i.e. if we will
|
|
* use it). */
|
|
switch (action)
|
|
{
|
|
case ACT_RP_SHORT_LEFT:
|
|
case ACT_RP_LONG_LEFT:
|
|
case ACT_RP_SHORT_RIGHT:
|
|
case ACT_RP_LONG_RIGHT:
|
|
/* Always expand for these. */
|
|
expand_pattern = 1;
|
|
break;
|
|
|
|
case ACT_NULL_ERROR:
|
|
case ACT_NULL_SUBST:
|
|
case ACT_NULL_ASSIGN:
|
|
if (!value || (!*value && colon_seen))
|
|
/* If param is unset, or set but null and a colon has been seen,
|
|
the expansion of the pattern will be needed. */
|
|
expand_pattern = 1;
|
|
|
|
break;
|
|
|
|
case ACT_NONNULL_SUBST:
|
|
/* Expansion of word will be needed if parameter is set and not null,
|
|
or set null but no colon has been seen. */
|
|
if (value && (*value || !colon_seen))
|
|
expand_pattern = 1;
|
|
|
|
break;
|
|
|
|
default:
|
|
assert (! "Unrecognised action!");
|
|
}
|
|
|
|
if (expand_pattern)
|
|
{
|
|
/* We need to perform tilde expansion, parameter expansion,
|
|
command substitution, and arithmetic expansion. We also
|
|
have to be a bit careful with wildcard characters, as
|
|
pattern might be given to fnmatch soon. To do this, we
|
|
convert quotes to escapes. */
|
|
|
|
char *expanded;
|
|
size_t exp_len;
|
|
size_t exp_maxl;
|
|
char *p;
|
|
int quoted = 0; /* 1: single quotes; 2: double */
|
|
|
|
expanded = w_newword (&exp_len, &exp_maxl);
|
|
for (p = pattern; p && *p; p++)
|
|
{
|
|
size_t offset;
|
|
|
|
switch (*p)
|
|
{
|
|
case '"':
|
|
if (quoted == 2)
|
|
quoted = 0;
|
|
else if (quoted == 0)
|
|
quoted = 2;
|
|
else break;
|
|
|
|
continue;
|
|
|
|
case '\'':
|
|
if (quoted == 1)
|
|
quoted = 0;
|
|
else if (quoted == 0)
|
|
quoted = 1;
|
|
else break;
|
|
|
|
continue;
|
|
|
|
case '*':
|
|
case '?':
|
|
if (quoted)
|
|
{
|
|
/* Convert quoted wildchar to escaped wildchar. */
|
|
expanded = w_addchar (expanded, &exp_len,
|
|
&exp_maxl, '\\');
|
|
|
|
if (expanded == NULL)
|
|
goto no_space;
|
|
}
|
|
break;
|
|
|
|
case '$':
|
|
offset = 0;
|
|
error = parse_dollars (&expanded, &exp_len, &exp_maxl, p,
|
|
&offset, flags, NULL, NULL, NULL, 1);
|
|
if (error)
|
|
{
|
|
if (free_value)
|
|
free (value);
|
|
|
|
free (expanded);
|
|
|
|
goto do_error;
|
|
}
|
|
|
|
p += offset;
|
|
continue;
|
|
|
|
case '~':
|
|
if (quoted || exp_len)
|
|
break;
|
|
|
|
offset = 0;
|
|
error = parse_tilde (&expanded, &exp_len, &exp_maxl, p,
|
|
&offset, 0);
|
|
if (error)
|
|
{
|
|
if (free_value)
|
|
free (value);
|
|
|
|
free (expanded);
|
|
|
|
goto do_error;
|
|
}
|
|
|
|
p += offset;
|
|
continue;
|
|
|
|
case '\\':
|
|
expanded = w_addchar (expanded, &exp_len, &exp_maxl, '\\');
|
|
++p;
|
|
assert (*p); /* checked when extracted initially */
|
|
if (expanded == NULL)
|
|
goto no_space;
|
|
}
|
|
|
|
expanded = w_addchar (expanded, &exp_len, &exp_maxl, *p);
|
|
|
|
if (expanded == NULL)
|
|
goto no_space;
|
|
}
|
|
|
|
free (pattern);
|
|
|
|
pattern = expanded;
|
|
}
|
|
|
|
switch (action)
|
|
{
|
|
case ACT_RP_SHORT_LEFT:
|
|
case ACT_RP_LONG_LEFT:
|
|
case ACT_RP_SHORT_RIGHT:
|
|
case ACT_RP_LONG_RIGHT:
|
|
{
|
|
char *p;
|
|
char c;
|
|
char *end;
|
|
|
|
if (value == NULL || pattern == NULL || *pattern == '\0')
|
|
break;
|
|
|
|
end = value + strlen (value);
|
|
|
|
switch (action)
|
|
{
|
|
case ACT_RP_SHORT_LEFT:
|
|
for (p = value; p <= end; ++p)
|
|
{
|
|
c = *p;
|
|
*p = '\0';
|
|
if (fnmatch (pattern, value, 0) != FNM_NOMATCH)
|
|
{
|
|
*p = c;
|
|
if (free_value)
|
|
{
|
|
char *newval = __strdup (p);
|
|
if (newval == NULL)
|
|
{
|
|
free (value);
|
|
goto no_space;
|
|
}
|
|
free (value);
|
|
value = newval;
|
|
}
|
|
else
|
|
value = p;
|
|
break;
|
|
}
|
|
*p = c;
|
|
}
|
|
|
|
break;
|
|
|
|
case ACT_RP_LONG_LEFT:
|
|
for (p = end; p >= value; --p)
|
|
{
|
|
c = *p;
|
|
*p = '\0';
|
|
if (fnmatch (pattern, value, 0) != FNM_NOMATCH)
|
|
{
|
|
*p = c;
|
|
if (free_value)
|
|
{
|
|
char *newval = __strdup (p);
|
|
if (newval == NULL)
|
|
{
|
|
free (value);
|
|
goto no_space;
|
|
}
|
|
free (value);
|
|
value = newval;
|
|
}
|
|
else
|
|
value = p;
|
|
break;
|
|
}
|
|
*p = c;
|
|
}
|
|
|
|
break;
|
|
|
|
case ACT_RP_SHORT_RIGHT:
|
|
for (p = end; p >= value; --p)
|
|
{
|
|
if (fnmatch (pattern, p, 0) != FNM_NOMATCH)
|
|
{
|
|
char *newval;
|
|
newval = malloc (p - value + 1);
|
|
|
|
if (newval == NULL)
|
|
{
|
|
if (free_value)
|
|
free (value);
|
|
goto no_space;
|
|
}
|
|
|
|
*(char *) __mempcpy (newval, value, p - value) = '\0';
|
|
if (free_value)
|
|
free (value);
|
|
value = newval;
|
|
free_value = 1;
|
|
break;
|
|
}
|
|
}
|
|
|
|
break;
|
|
|
|
case ACT_RP_LONG_RIGHT:
|
|
for (p = value; p <= end; ++p)
|
|
{
|
|
if (fnmatch (pattern, p, 0) != FNM_NOMATCH)
|
|
{
|
|
char *newval;
|
|
newval = malloc (p - value + 1);
|
|
|
|
if (newval == NULL)
|
|
{
|
|
if (free_value)
|
|
free (value);
|
|
goto no_space;
|
|
}
|
|
|
|
*(char *) __mempcpy (newval, value, p - value) = '\0';
|
|
if (free_value)
|
|
free (value);
|
|
value = newval;
|
|
free_value = 1;
|
|
break;
|
|
}
|
|
}
|
|
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
case ACT_NULL_ERROR:
|
|
if (value && *value)
|
|
/* Substitute parameter */
|
|
break;
|
|
|
|
error = 0;
|
|
if (!colon_seen && value)
|
|
/* Substitute NULL */
|
|
;
|
|
else
|
|
{
|
|
const char *str = pattern;
|
|
|
|
if (str[0] == '\0')
|
|
str = _("parameter null or not set");
|
|
|
|
__fxprintf (NULL, "%s: %s\n", env, str);
|
|
}
|
|
|
|
if (free_value)
|
|
free (value);
|
|
goto do_error;
|
|
|
|
case ACT_NULL_SUBST:
|
|
if (value && *value)
|
|
/* Substitute parameter */
|
|
break;
|
|
|
|
if (free_value)
|
|
free (value);
|
|
|
|
if (!colon_seen && value)
|
|
/* Substitute NULL */
|
|
goto success;
|
|
|
|
value = pattern ? __strdup (pattern) : pattern;
|
|
free_value = 1;
|
|
|
|
if (pattern && !value)
|
|
goto no_space;
|
|
|
|
break;
|
|
|
|
case ACT_NONNULL_SUBST:
|
|
if (value && (*value || !colon_seen))
|
|
{
|
|
if (free_value)
|
|
free (value);
|
|
|
|
value = pattern ? __strdup (pattern) : pattern;
|
|
free_value = 1;
|
|
|
|
if (pattern && !value)
|
|
goto no_space;
|
|
|
|
break;
|
|
}
|
|
|
|
/* Substitute NULL */
|
|
if (free_value)
|
|
free (value);
|
|
goto success;
|
|
|
|
case ACT_NULL_ASSIGN:
|
|
if (value && *value)
|
|
/* Substitute parameter */
|
|
break;
|
|
|
|
if (!colon_seen && value)
|
|
{
|
|
/* Substitute NULL */
|
|
if (free_value)
|
|
free (value);
|
|
goto success;
|
|
}
|
|
|
|
if (free_value)
|
|
free (value);
|
|
|
|
value = pattern ? __strdup (pattern) : pattern;
|
|
free_value = 1;
|
|
|
|
if (pattern && !value)
|
|
goto no_space;
|
|
|
|
__setenv (env, value ?: "", 1);
|
|
break;
|
|
|
|
default:
|
|
assert (! "Unrecognised action!");
|
|
}
|
|
}
|
|
|
|
free (env);
|
|
env = NULL;
|
|
free (pattern);
|
|
pattern = NULL;
|
|
|
|
if (seen_hash)
|
|
{
|
|
char param_length[21];
|
|
param_length[20] = '\0';
|
|
*word = w_addstr (*word, word_length, max_length,
|
|
_itoa_word (value ? strlen (value) : 0,
|
|
¶m_length[20], 10, 0));
|
|
if (free_value)
|
|
{
|
|
assert (value != NULL);
|
|
free (value);
|
|
}
|
|
|
|
return *word ? 0 : WRDE_NOSPACE;
|
|
}
|
|
|
|
if (value == NULL)
|
|
return 0;
|
|
|
|
if (quoted || !pwordexp)
|
|
{
|
|
/* Quoted - no field split */
|
|
*word = w_addstr (*word, word_length, max_length, value);
|
|
if (free_value)
|
|
free (value);
|
|
|
|
return *word ? 0 : WRDE_NOSPACE;
|
|
}
|
|
else
|
|
{
|
|
/* Need to field-split */
|
|
char *value_copy = __strdup (value); /* Don't modify value */
|
|
char *field_begin = value_copy;
|
|
int seen_nonws_ifs = 0;
|
|
|
|
if (free_value)
|
|
free (value);
|
|
|
|
if (value_copy == NULL)
|
|
goto no_space;
|
|
|
|
do
|
|
{
|
|
char *field_end = field_begin;
|
|
char *next_field;
|
|
|
|
/* If this isn't the first field, start a new word */
|
|
if (field_begin != value_copy)
|
|
{
|
|
if (w_addword (pwordexp, *word) == WRDE_NOSPACE)
|
|
{
|
|
free (value_copy);
|
|
goto no_space;
|
|
}
|
|
|
|
*word = w_newword (word_length, max_length);
|
|
}
|
|
|
|
/* Skip IFS whitespace before the field */
|
|
field_begin += strspn (field_begin, ifs_white);
|
|
|
|
if (!seen_nonws_ifs && *field_begin == 0)
|
|
/* Nothing but whitespace */
|
|
break;
|
|
|
|
/* Search for the end of the field */
|
|
field_end = field_begin + strcspn (field_begin, ifs);
|
|
|
|
/* Set up pointer to the character after end of field and
|
|
skip whitespace IFS after it. */
|
|
next_field = field_end + strspn (field_end, ifs_white);
|
|
|
|
/* Skip at most one non-whitespace IFS character after the field */
|
|
seen_nonws_ifs = 0;
|
|
if (*next_field && strchr (ifs, *next_field))
|
|
{
|
|
seen_nonws_ifs = 1;
|
|
next_field++;
|
|
}
|
|
|
|
/* Null-terminate it */
|
|
*field_end = 0;
|
|
|
|
/* Tag a copy onto the current word */
|
|
*word = w_addstr (*word, word_length, max_length, field_begin);
|
|
|
|
if (*word == NULL && *field_begin != '\0')
|
|
{
|
|
free (value_copy);
|
|
goto no_space;
|
|
}
|
|
|
|
field_begin = next_field;
|
|
}
|
|
while (seen_nonws_ifs || *field_begin);
|
|
|
|
free (value_copy);
|
|
}
|
|
|
|
return 0;
|
|
|
|
success:
|
|
error = 0;
|
|
goto do_error;
|
|
|
|
no_space:
|
|
error = WRDE_NOSPACE;
|
|
goto do_error;
|
|
|
|
syntax:
|
|
error = WRDE_SYNTAX;
|
|
|
|
do_error:
|
|
free (env);
|
|
|
|
free (pattern);
|
|
|
|
return error;
|
|
}
|
|
|
|
#undef CHAR_IN_SET
|
|
|
|
static int
|
|
parse_dollars (char **word, size_t *word_length, size_t *max_length,
|
|
const char *words, size_t *offset, int flags,
|
|
wordexp_t *pwordexp, const char *ifs, const char *ifs_white,
|
|
int quoted)
|
|
{
|
|
/* We are poised _at_ "$" */
|
|
switch (words[1 + *offset])
|
|
{
|
|
case '"':
|
|
case '\'':
|
|
case 0:
|
|
*word = w_addchar (*word, word_length, max_length, '$');
|
|
return *word ? 0 : WRDE_NOSPACE;
|
|
|
|
case '(':
|
|
if (words[2 + *offset] == '(')
|
|
{
|
|
/* Differentiate between $((1+3)) and $((echo);(ls)) */
|
|
int i = 3 + *offset;
|
|
int depth = 0;
|
|
while (words[i] && !(depth == 0 && words[i] == ')'))
|
|
{
|
|
if (words[i] == '(')
|
|
++depth;
|
|
else if (words[i] == ')')
|
|
--depth;
|
|
|
|
++i;
|
|
}
|
|
|
|
if (words[i] == ')' && words[i + 1] == ')')
|
|
{
|
|
(*offset) += 3;
|
|
/* Call parse_arith -- 0 is for "no brackets" */
|
|
return parse_arith (word, word_length, max_length, words, offset,
|
|
flags, 0);
|
|
}
|
|
}
|
|
|
|
(*offset) += 2;
|
|
return parse_comm (word, word_length, max_length, words, offset, flags,
|
|
quoted? NULL : pwordexp, ifs, ifs_white);
|
|
|
|
case '[':
|
|
(*offset) += 2;
|
|
/* Call parse_arith -- 1 is for "brackets" */
|
|
return parse_arith (word, word_length, max_length, words, offset, flags,
|
|
1);
|
|
|
|
case '{':
|
|
default:
|
|
++(*offset); /* parse_param needs to know if "{" is there */
|
|
return parse_param (word, word_length, max_length, words, offset, flags,
|
|
pwordexp, ifs, ifs_white, quoted);
|
|
}
|
|
}
|
|
|
|
static int
|
|
parse_backtick (char **word, size_t *word_length, size_t *max_length,
|
|
const char *words, size_t *offset, int flags,
|
|
wordexp_t *pwordexp, const char *ifs, const char *ifs_white)
|
|
{
|
|
/* We are poised just after "`" */
|
|
int error;
|
|
int squoting = 0;
|
|
size_t comm_length;
|
|
size_t comm_maxlen;
|
|
char *comm = w_newword (&comm_length, &comm_maxlen);
|
|
|
|
for (; words[*offset]; ++(*offset))
|
|
{
|
|
switch (words[*offset])
|
|
{
|
|
case '`':
|
|
/* Go -- give the script to the shell */
|
|
error = exec_comm (comm, word, word_length, max_length, flags,
|
|
pwordexp, ifs, ifs_white);
|
|
free (comm);
|
|
return error;
|
|
|
|
case '\\':
|
|
if (squoting)
|
|
{
|
|
error = parse_qtd_backslash (&comm, &comm_length, &comm_maxlen,
|
|
words, offset);
|
|
|
|
if (error)
|
|
{
|
|
free (comm);
|
|
return error;
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
error = parse_backslash (&comm, &comm_length, &comm_maxlen, words,
|
|
offset);
|
|
|
|
if (error)
|
|
{
|
|
free (comm);
|
|
return error;
|
|
}
|
|
|
|
break;
|
|
|
|
case '\'':
|
|
squoting = 1 - squoting;
|
|
default:
|
|
comm = w_addchar (comm, &comm_length, &comm_maxlen, words[*offset]);
|
|
if (comm == NULL)
|
|
return WRDE_NOSPACE;
|
|
}
|
|
}
|
|
|
|
/* Premature end */
|
|
free (comm);
|
|
return WRDE_SYNTAX;
|
|
}
|
|
|
|
static int
|
|
parse_dquote (char **word, size_t *word_length, size_t *max_length,
|
|
const char *words, size_t *offset, int flags,
|
|
wordexp_t *pwordexp, const char * ifs, const char * ifs_white)
|
|
{
|
|
/* We are poised just after a double-quote */
|
|
int error;
|
|
|
|
for (; words[*offset]; ++(*offset))
|
|
{
|
|
switch (words[*offset])
|
|
{
|
|
case '"':
|
|
return 0;
|
|
|
|
case '$':
|
|
error = parse_dollars (word, word_length, max_length, words, offset,
|
|
flags, pwordexp, ifs, ifs_white, 1);
|
|
/* The ``1'' here is to tell parse_dollars not to
|
|
* split the fields. It may need to, however ("$@").
|
|
*/
|
|
if (error)
|
|
return error;
|
|
|
|
break;
|
|
|
|
case '`':
|
|
++(*offset);
|
|
error = parse_backtick (word, word_length, max_length, words,
|
|
offset, flags, NULL, NULL, NULL);
|
|
/* The first NULL here is to tell parse_backtick not to
|
|
* split the fields.
|
|
*/
|
|
if (error)
|
|
return error;
|
|
|
|
break;
|
|
|
|
case '\\':
|
|
error = parse_qtd_backslash (word, word_length, max_length, words,
|
|
offset);
|
|
|
|
if (error)
|
|
return error;
|
|
|
|
break;
|
|
|
|
default:
|
|
*word = w_addchar (*word, word_length, max_length, words[*offset]);
|
|
if (*word == NULL)
|
|
return WRDE_NOSPACE;
|
|
}
|
|
}
|
|
|
|
/* Unterminated string */
|
|
return WRDE_SYNTAX;
|
|
}
|
|
|
|
/*
|
|
* wordfree() is to be called after pwordexp is finished with.
|
|
*/
|
|
|
|
void
|
|
wordfree (wordexp_t *pwordexp)
|
|
{
|
|
|
|
/* wordexp can set pwordexp to NULL */
|
|
if (pwordexp && pwordexp->we_wordv)
|
|
{
|
|
char **wordv = pwordexp->we_wordv;
|
|
|
|
for (wordv += pwordexp->we_offs; *wordv; ++wordv)
|
|
free (*wordv);
|
|
|
|
free (pwordexp->we_wordv);
|
|
pwordexp->we_wordv = NULL;
|
|
}
|
|
}
|
|
libc_hidden_def (wordfree)
|
|
|
|
/*
|
|
* wordexp()
|
|
*/
|
|
|
|
int
|
|
wordexp (const char *words, wordexp_t *pwordexp, int flags)
|
|
{
|
|
size_t words_offset;
|
|
size_t word_length;
|
|
size_t max_length;
|
|
char *word = w_newword (&word_length, &max_length);
|
|
int error;
|
|
char *ifs;
|
|
char ifs_white[4];
|
|
wordexp_t old_word = *pwordexp;
|
|
|
|
if (flags & WRDE_REUSE)
|
|
{
|
|
/* Minimal implementation of WRDE_REUSE for now */
|
|
wordfree (pwordexp);
|
|
old_word.we_wordv = NULL;
|
|
}
|
|
|
|
if ((flags & WRDE_APPEND) == 0)
|
|
{
|
|
pwordexp->we_wordc = 0;
|
|
|
|
if (flags & WRDE_DOOFFS)
|
|
{
|
|
pwordexp->we_wordv = calloc (1 + pwordexp->we_offs, sizeof (char *));
|
|
if (pwordexp->we_wordv == NULL)
|
|
{
|
|
error = WRDE_NOSPACE;
|
|
goto do_error;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
pwordexp->we_wordv = calloc (1, sizeof (char *));
|
|
if (pwordexp->we_wordv == NULL)
|
|
{
|
|
error = WRDE_NOSPACE;
|
|
goto do_error;
|
|
}
|
|
|
|
pwordexp->we_offs = 0;
|
|
}
|
|
}
|
|
|
|
/* Find out what the field separators are.
|
|
* There are two types: whitespace and non-whitespace.
|
|
*/
|
|
ifs = getenv ("IFS");
|
|
|
|
if (ifs == NULL)
|
|
/* IFS unset - use <space><tab><newline>. */
|
|
ifs = strcpy (ifs_white, " \t\n");
|
|
else
|
|
{
|
|
char *ifsch = ifs;
|
|
char *whch = ifs_white;
|
|
|
|
while (*ifsch != '\0')
|
|
{
|
|
if (*ifsch == ' ' || *ifsch == '\t' || *ifsch == '\n')
|
|
{
|
|
/* Whitespace IFS. See first whether it is already in our
|
|
collection. */
|
|
char *runp = ifs_white;
|
|
|
|
while (runp < whch && *runp != *ifsch)
|
|
++runp;
|
|
|
|
if (runp == whch)
|
|
*whch++ = *ifsch;
|
|
}
|
|
|
|
++ifsch;
|
|
}
|
|
*whch = '\0';
|
|
}
|
|
|
|
for (words_offset = 0 ; words[words_offset] ; ++words_offset)
|
|
switch (words[words_offset])
|
|
{
|
|
case '\\':
|
|
error = parse_backslash (&word, &word_length, &max_length, words,
|
|
&words_offset);
|
|
|
|
if (error)
|
|
goto do_error;
|
|
|
|
break;
|
|
|
|
case '$':
|
|
error = parse_dollars (&word, &word_length, &max_length, words,
|
|
&words_offset, flags, pwordexp, ifs, ifs_white,
|
|
0);
|
|
|
|
if (error)
|
|
goto do_error;
|
|
|
|
break;
|
|
|
|
case '`':
|
|
++words_offset;
|
|
error = parse_backtick (&word, &word_length, &max_length, words,
|
|
&words_offset, flags, pwordexp, ifs,
|
|
ifs_white);
|
|
|
|
if (error)
|
|
goto do_error;
|
|
|
|
break;
|
|
|
|
case '"':
|
|
++words_offset;
|
|
error = parse_dquote (&word, &word_length, &max_length, words,
|
|
&words_offset, flags, pwordexp, ifs, ifs_white);
|
|
|
|
if (error)
|
|
goto do_error;
|
|
|
|
if (!word_length)
|
|
{
|
|
error = w_addword (pwordexp, NULL);
|
|
|
|
if (error)
|
|
return error;
|
|
}
|
|
|
|
break;
|
|
|
|
case '\'':
|
|
++words_offset;
|
|
error = parse_squote (&word, &word_length, &max_length, words,
|
|
&words_offset);
|
|
|
|
if (error)
|
|
goto do_error;
|
|
|
|
if (!word_length)
|
|
{
|
|
error = w_addword (pwordexp, NULL);
|
|
|
|
if (error)
|
|
return error;
|
|
}
|
|
|
|
break;
|
|
|
|
case '~':
|
|
error = parse_tilde (&word, &word_length, &max_length, words,
|
|
&words_offset, pwordexp->we_wordc);
|
|
|
|
if (error)
|
|
goto do_error;
|
|
|
|
break;
|
|
|
|
case '*':
|
|
case '[':
|
|
case '?':
|
|
error = parse_glob (&word, &word_length, &max_length, words,
|
|
&words_offset, flags, pwordexp, ifs, ifs_white);
|
|
|
|
if (error)
|
|
goto do_error;
|
|
|
|
break;
|
|
|
|
default:
|
|
/* Is it a word separator? */
|
|
if (strchr (" \t", words[words_offset]) == NULL)
|
|
{
|
|
char ch = words[words_offset];
|
|
|
|
/* Not a word separator -- but is it a valid word char? */
|
|
if (strchr ("\n|&;<>(){}", ch))
|
|
{
|
|
/* Fail */
|
|
error = WRDE_BADCHAR;
|
|
goto do_error;
|
|
}
|
|
|
|
/* "Ordinary" character -- add it to word */
|
|
word = w_addchar (word, &word_length, &max_length,
|
|
ch);
|
|
if (word == NULL)
|
|
{
|
|
error = WRDE_NOSPACE;
|
|
goto do_error;
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
/* If a word has been delimited, add it to the list. */
|
|
if (word != NULL)
|
|
{
|
|
error = w_addword (pwordexp, word);
|
|
if (error)
|
|
goto do_error;
|
|
}
|
|
|
|
word = w_newword (&word_length, &max_length);
|
|
}
|
|
|
|
/* End of string */
|
|
|
|
/* There was a word separator at the end */
|
|
if (word == NULL) /* i.e. w_newword */
|
|
return 0;
|
|
|
|
/* There was no field separator at the end */
|
|
return w_addword (pwordexp, word);
|
|
|
|
do_error:
|
|
/* Error:
|
|
* free memory used (unless error is WRDE_NOSPACE), and
|
|
* set pwordexp members back to what they were.
|
|
*/
|
|
|
|
free (word);
|
|
|
|
if (error == WRDE_NOSPACE)
|
|
return WRDE_NOSPACE;
|
|
|
|
if ((flags & WRDE_APPEND) == 0)
|
|
wordfree (pwordexp);
|
|
|
|
*pwordexp = old_word;
|
|
return error;
|
|
}
|