614 lines
16 KiB
C
614 lines
16 KiB
C
/* quotearg.c - quote arguments for output
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Copyright (C) 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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/* Written by Paul Eggert <eggert@twinsun.com> */
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#if HAVE_CONFIG_H
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# include <config.h>
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#endif
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#if HAVE_STDDEF_H
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# include <stddef.h> /* For the definition of size_t on windows w/MSVC. */
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#endif
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#include <sys/types.h>
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#include <quotearg.h>
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#include <xalloc.h>
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#include <ctype.h>
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#if ENABLE_NLS
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# include <libintl.h>
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# define _(text) gettext (text)
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#else
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# define _(text) text
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#endif
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#define N_(text) text
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#if HAVE_LIMITS_H
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# include <limits.h>
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#endif
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#ifndef CHAR_BIT
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# define CHAR_BIT 8
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#endif
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#ifndef UCHAR_MAX
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# define UCHAR_MAX ((unsigned char) -1)
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#endif
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#if HAVE_C_BACKSLASH_A
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# define ALERT_CHAR '\a'
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#else
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# define ALERT_CHAR '\7'
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#endif
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#if HAVE_STDLIB_H
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# include <stdlib.h>
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#endif
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#if HAVE_STRING_H
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# include <string.h>
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#endif
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#if HAVE_WCHAR_H
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# include <wchar.h>
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#endif
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#if !HAVE_MBRTOWC
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/* Disable multibyte processing entirely. Since MB_CUR_MAX is 1, the
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other macros are defined only for documentation and to satisfy C
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syntax. */
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# undef MB_CUR_MAX
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# define MB_CUR_MAX 1
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# define mbrtowc(pwc, s, n, ps) ((*(pwc) = *(s)) != 0)
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# define mbsinit(ps) 1
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# define iswprint(wc) ISPRINT ((unsigned char) (wc))
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#endif
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#ifndef iswprint
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# if HAVE_WCTYPE_H
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# include <wctype.h>
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# endif
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# if !defined iswprint && !HAVE_ISWPRINT
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# define iswprint(wc) 1
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# endif
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#endif
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#define INT_BITS (sizeof (int) * CHAR_BIT)
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#if defined (STDC_HEADERS) || (!defined (isascii) && !defined (HAVE_ISASCII))
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# define IN_CTYPE_DOMAIN(c) 1
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#else
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# define IN_CTYPE_DOMAIN(c) isascii(c)
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#endif
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/* Undefine to protect against the definition in wctype.h of solaris2.6. */
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#undef ISPRINT
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#define ISPRINT(c) (IN_CTYPE_DOMAIN (c) && isprint (c))
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struct quoting_options
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{
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/* Basic quoting style. */
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enum quoting_style style;
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/* Quote the characters indicated by this bit vector even if the
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quoting style would not normally require them to be quoted. */
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int quote_these_too[(UCHAR_MAX / INT_BITS) + 1];
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};
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/* Names of quoting styles. */
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char const *const quoting_style_args[] =
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{
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"literal",
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"shell",
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"shell-always",
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"c",
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"escape",
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"locale",
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"clocale",
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0
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};
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/* Correspondences to quoting style names. */
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enum quoting_style const quoting_style_vals[] =
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{
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literal_quoting_style,
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shell_quoting_style,
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shell_always_quoting_style,
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c_quoting_style,
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escape_quoting_style,
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locale_quoting_style,
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clocale_quoting_style
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};
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/* The default quoting options. */
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static struct quoting_options default_quoting_options;
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/* Allocate a new set of quoting options, with contents initially identical
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to O if O is not null, or to the default if O is null.
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It is the caller's responsibility to free the result. */
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struct quoting_options *
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clone_quoting_options (struct quoting_options *o)
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{
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struct quoting_options *p
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= (struct quoting_options *) xmalloc (sizeof (struct quoting_options));
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*p = *(o ? o : &default_quoting_options);
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return p;
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}
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/* Get the value of O's quoting style. If O is null, use the default. */
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enum quoting_style
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get_quoting_style (struct quoting_options *o)
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{
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return (o ? o : &default_quoting_options)->style;
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}
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/* In O (or in the default if O is null),
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set the value of the quoting style to S. */
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void
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set_quoting_style (struct quoting_options *o, enum quoting_style s)
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{
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(o ? o : &default_quoting_options)->style = s;
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}
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/* In O (or in the default if O is null),
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set the value of the quoting options for character C to I.
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Return the old value. Currently, the only values defined for I are
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0 (the default) and 1 (which means to quote the character even if
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it would not otherwise be quoted). */
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int
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set_char_quoting (struct quoting_options *o, char c, int i)
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{
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unsigned char uc = c;
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int *p = (o ? o : &default_quoting_options)->quote_these_too + uc / INT_BITS;
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int shift = uc % INT_BITS;
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int r = (*p >> shift) & 1;
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*p ^= ((i & 1) ^ r) << shift;
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return r;
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}
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/* MSGID approximates a quotation mark. Return its translation if it
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has one; otherwise, return either it or "\"", depending on S. */
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static char const *
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gettext_quote (char const *msgid, enum quoting_style s)
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{
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char const *translation = _(msgid);
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if (translation == msgid && s == clocale_quoting_style)
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translation = "\"";
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return translation;
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}
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/* Place into buffer BUFFER (of size BUFFERSIZE) a quoted version of
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argument ARG (of size ARGSIZE), using QUOTING_STYLE and the
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non-quoting-style part of O to control quoting.
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Terminate the output with a null character, and return the written
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size of the output, not counting the terminating null.
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If BUFFERSIZE is too small to store the output string, return the
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value that would have been returned had BUFFERSIZE been large enough.
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If ARGSIZE is -1, use the string length of the argument for ARGSIZE.
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This function acts like quotearg_buffer (BUFFER, BUFFERSIZE, ARG,
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ARGSIZE, O), except it uses QUOTING_STYLE instead of the quoting
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style specified by O, and O may not be null. */
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static size_t
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quotearg_buffer_restyled (char *buffer, size_t buffersize,
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char const *arg, size_t argsize,
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enum quoting_style quoting_style,
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struct quoting_options const *o)
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{
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size_t i;
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size_t len = 0;
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char const *quote_string = 0;
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size_t quote_string_len = 0;
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int backslash_escapes = 0;
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int unibyte_locale = MB_CUR_MAX == 1;
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#define STORE(c) \
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do \
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{ \
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if (len < buffersize) \
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buffer[len] = (c); \
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len++; \
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} \
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while (0)
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switch (quoting_style)
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{
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case c_quoting_style:
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STORE ('"');
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backslash_escapes = 1;
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quote_string = "\"";
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quote_string_len = 1;
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break;
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case escape_quoting_style:
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backslash_escapes = 1;
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break;
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case locale_quoting_style:
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case clocale_quoting_style:
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{
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/* Get translations for open and closing quotation marks.
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The message catalog should translate "`" to a left
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quotation mark suitable for the locale, and similarly for
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"'". If the catalog has no translation,
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locale_quoting_style quotes `like this', and
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clocale_quoting_style quotes "like this".
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For example, an American English Unicode locale should
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translate "`" to U+201C (LEFT DOUBLE QUOTATION MARK), and
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should translate "'" to U+201D (RIGHT DOUBLE QUOTATION
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MARK). A British English Unicode locale should instead
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translate these to U+2018 (LEFT SINGLE QUOTATION MARK) and
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U+2019 (RIGHT SINGLE QUOTATION MARK), respectively. */
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char const *left = gettext_quote (N_("`"), quoting_style);
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char const *right = gettext_quote (N_("'"), quoting_style);
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for (quote_string = left; *quote_string; quote_string++)
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STORE (*quote_string);
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backslash_escapes = 1;
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quote_string = right;
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quote_string_len = strlen (quote_string);
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}
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break;
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case shell_always_quoting_style:
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STORE ('\'');
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quote_string = "'";
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quote_string_len = 1;
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break;
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default:
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break;
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}
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for (i = 0; ! (argsize == (size_t) -1 ? arg[i] == '\0' : i == argsize); i++)
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{
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unsigned char c;
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unsigned char esc;
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if (backslash_escapes
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&& quote_string_len
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&& i + quote_string_len <= argsize
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&& memcmp (arg + i, quote_string, quote_string_len) == 0)
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STORE ('\\');
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c = arg[i];
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switch (c)
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{
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case '?':
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switch (quoting_style)
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{
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case shell_quoting_style:
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goto use_shell_always_quoting_style;
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case c_quoting_style:
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if (i + 2 < argsize && arg[i + 1] == '?')
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switch (arg[i + 2])
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{
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case '!': case '\'':
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case '(': case ')': case '-': case '/':
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case '<': case '=': case '>':
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/* Escape the second '?' in what would otherwise be
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a trigraph. */
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i += 2;
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c = arg[i + 2];
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STORE ('?');
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STORE ('\\');
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STORE ('?');
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break;
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}
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break;
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default:
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break;
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}
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break;
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case ALERT_CHAR: esc = 'a'; goto c_escape;
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case '\b': esc = 'b'; goto c_escape;
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case '\f': esc = 'f'; goto c_escape;
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case '\n': esc = 'n'; goto c_and_shell_escape;
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case '\r': esc = 'r'; goto c_and_shell_escape;
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case '\t': esc = 't'; goto c_and_shell_escape;
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case '\v': esc = 'v'; goto c_escape;
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case '\\': esc = c; goto c_and_shell_escape;
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c_and_shell_escape:
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if (quoting_style == shell_quoting_style)
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goto use_shell_always_quoting_style;
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c_escape:
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if (backslash_escapes)
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{
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c = esc;
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goto store_escape;
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}
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break;
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case '#': case '~':
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if (i != 0)
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break;
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/* Fall through. */
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case ' ':
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case '!': /* special in bash */
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case '"': case '$': case '&':
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case '(': case ')': case '*': case ';':
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case '<': case '>': case '[':
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case '^': /* special in old /bin/sh, e.g. SunOS 4.1.4 */
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case '`': case '|':
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/* A shell special character. In theory, '$' and '`' could
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be the first bytes of multibyte characters, which means
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we should check them with mbrtowc, but in practice this
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doesn't happen so it's not worth worrying about. */
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if (quoting_style == shell_quoting_style)
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goto use_shell_always_quoting_style;
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break;
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case '\'':
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switch (quoting_style)
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{
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case shell_quoting_style:
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goto use_shell_always_quoting_style;
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case shell_always_quoting_style:
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STORE ('\'');
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STORE ('\\');
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STORE ('\'');
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break;
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default:
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break;
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}
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break;
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case '%': case '+': case ',': case '-': case '.': case '/':
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case '0': case '1': case '2': case '3': case '4': case '5':
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case '6': case '7': case '8': case '9': case ':': case '=':
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case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
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case 'G': case 'H': case 'I': case 'J': case 'K': case 'L':
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case 'M': case 'N': case 'O': case 'P': case 'Q': case 'R':
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case 'S': case 'T': case 'U': case 'V': case 'W': case 'X':
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case 'Y': case 'Z': case ']': case '_': case 'a': case 'b':
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case 'c': case 'd': case 'e': case 'f': case 'g': case 'h':
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case 'i': case 'j': case 'k': case 'l': case 'm': case 'n':
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case 'o': case 'p': case 'q': case 'r': case 's': case 't':
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case 'u': case 'v': case 'w': case 'x': case 'y': case 'z':
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case '{': case '}':
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/* These characters don't cause problems, no matter what the
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quoting style is. They cannot start multibyte sequences. */
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break;
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default:
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/* If we have a multibyte sequence, copy it until we reach
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its end, find an error, or come back to the initial shift
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state. For C-like styles, if the sequence has
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unprintable characters, escape the whole sequence, since
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we can't easily escape single characters within it. */
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{
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/* Length of multibyte sequence found so far. */
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size_t m;
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int printable;
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if (unibyte_locale)
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{
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m = 1;
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printable = ISPRINT (c);
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}
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else
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{
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mbstate_t mbstate;
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memset (&mbstate, 0, sizeof mbstate);
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m = 0;
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printable = 1;
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if (argsize == (size_t) -1)
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argsize = strlen (arg);
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do
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{
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wchar_t w;
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size_t bytes = mbrtowc (&w, &arg[i + m],
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argsize - (i + m), &mbstate);
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if (bytes == 0)
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break;
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else if (bytes == (size_t) -1)
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{
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printable = 0;
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break;
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}
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else if (bytes == (size_t) -2)
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{
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printable = 0;
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while (i + m < argsize && arg[i + m])
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m++;
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break;
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}
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else
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{
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if (! iswprint (w))
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printable = 0;
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m += bytes;
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}
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}
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while (! mbsinit (&mbstate));
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}
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if (1 < m || (backslash_escapes && ! printable))
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{
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/* Output a multibyte sequence, or an escaped
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unprintable unibyte character. */
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size_t ilim = i + m;
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for (;;)
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{
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if (backslash_escapes && ! printable)
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{
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STORE ('\\');
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STORE ('0' + (c >> 6));
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STORE ('0' + ((c >> 3) & 7));
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c = '0' + (c & 7);
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}
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if (ilim <= i + 1)
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break;
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STORE (c);
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c = arg[++i];
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}
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goto store_c;
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}
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}
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}
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if (! (backslash_escapes
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&& o->quote_these_too[c / INT_BITS] & (1 << (c % INT_BITS))))
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goto store_c;
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store_escape:
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STORE ('\\');
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store_c:
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STORE (c);
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}
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if (quote_string)
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for (; *quote_string; quote_string++)
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STORE (*quote_string);
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if (len < buffersize)
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buffer[len] = '\0';
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return len;
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use_shell_always_quoting_style:
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return quotearg_buffer_restyled (buffer, buffersize, arg, argsize,
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shell_always_quoting_style, o);
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}
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/* Place into buffer BUFFER (of size BUFFERSIZE) a quoted version of
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argument ARG (of size ARGSIZE), using O to control quoting.
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If O is null, use the default.
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Terminate the output with a null character, and return the written
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size of the output, not counting the terminating null.
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If BUFFERSIZE is too small to store the output string, return the
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value that would have been returned had BUFFERSIZE been large enough.
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If ARGSIZE is -1, use the string length of the argument for ARGSIZE. */
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size_t
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quotearg_buffer (char *buffer, size_t buffersize,
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char const *arg, size_t argsize,
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struct quoting_options const *o)
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{
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struct quoting_options const *p = o ? o : &default_quoting_options;
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return quotearg_buffer_restyled (buffer, buffersize, arg, argsize,
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p->style, p);
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}
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/* Use storage slot N to return a quoted version of the string ARG.
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OPTIONS specifies the quoting options.
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The returned value points to static storage that can be
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reused by the next call to this function with the same value of N.
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N must be nonnegative. N is deliberately declared with type "int"
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to allow for future extensions (using negative values). */
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static char *
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quotearg_n_options (int n, char const *arg,
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struct quoting_options const *options)
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{
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/* Preallocate a slot 0 buffer, so that the caller can always quote
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one small component of a "memory exhausted" message in slot 0. */
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static char slot0[256];
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static unsigned int nslots = 1;
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struct slotvec
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{
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size_t size;
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char *val;
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};
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static struct slotvec slotvec0 = {sizeof slot0, slot0};
|
|
static struct slotvec *slotvec = &slotvec0;
|
|
|
|
if (nslots <= n)
|
|
{
|
|
int n1 = n + 1;
|
|
size_t s = n1 * sizeof (struct slotvec);
|
|
if (! (0 < n1 && n1 == s / sizeof (struct slotvec)))
|
|
abort ();
|
|
if (slotvec == &slotvec0)
|
|
{
|
|
slotvec = (struct slotvec *) xmalloc (sizeof (struct slotvec));
|
|
*slotvec = slotvec0;
|
|
}
|
|
slotvec = (struct slotvec *) xrealloc (slotvec, s);
|
|
memset (slotvec + nslots, 0, (n1 - nslots) * sizeof (struct slotvec));
|
|
nslots = n;
|
|
}
|
|
|
|
{
|
|
size_t size = slotvec[n].size;
|
|
char *val = slotvec[n].val;
|
|
size_t qsize = quotearg_buffer (val, size, arg, (size_t) -1, options);
|
|
|
|
if (size <= qsize)
|
|
{
|
|
slotvec[n].size = size = qsize + 1;
|
|
slotvec[n].val = val = xrealloc (val == slot0 ? 0 : val, size);
|
|
quotearg_buffer (val, size, arg, (size_t) -1, options);
|
|
}
|
|
|
|
return val;
|
|
}
|
|
}
|
|
|
|
char *
|
|
quotearg_n (unsigned int n, char const *arg)
|
|
{
|
|
return quotearg_n_options (n, arg, &default_quoting_options);
|
|
}
|
|
|
|
char *
|
|
quotearg (char const *arg)
|
|
{
|
|
return quotearg_n (0, arg);
|
|
}
|
|
|
|
char *
|
|
quotearg_n_style (unsigned int n, enum quoting_style s, char const *arg)
|
|
{
|
|
struct quoting_options o;
|
|
o.style = s;
|
|
memset (o.quote_these_too, 0, sizeof o.quote_these_too);
|
|
return quotearg_n_options (n, arg, &o);
|
|
}
|
|
|
|
char *
|
|
quotearg_style (enum quoting_style s, char const *arg)
|
|
{
|
|
return quotearg_n_style (0, s, arg);
|
|
}
|
|
|
|
char *
|
|
quotearg_char (char const *arg, char ch)
|
|
{
|
|
struct quoting_options options;
|
|
options = default_quoting_options;
|
|
set_char_quoting (&options, ch, 1);
|
|
return quotearg_n_options (0, arg, &options);
|
|
}
|
|
|
|
char *
|
|
quotearg_colon (char const *arg)
|
|
{
|
|
return quotearg_char (arg, ':');
|
|
}
|