/* quotearg.c - quote arguments for output   Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.   This program is free software; you can redistribute it and/or modify   it under the terms of the GNU General Public License as published by   the Free Software Foundation; either version 2, or (at your option)   any later version.   This program is distributed in the hope that it will be useful,   but WITHOUT ANY WARRANTY; without even the implied warranty of   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the   GNU General Public License for more details.   You should have received a copy of the GNU General Public License   along with this program; if not, write to the Free Software Foundation,   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  *//* Written by Paul Eggert <eggert@twinsun.com> */#if HAVE_CONFIG_H# include <config.h>#endif#if HAVE_STDDEF_H# include <stddef.h>  /* For the definition of size_t on windows w/MSVC.  */#endif#include <sys/types.h>#include <quotearg.h>#include <xalloc.h>#include <ctype.h>#if ENABLE_NLS# include <libintl.h># define _(text) gettext (text)#else# define _(text) text#endif#define N_(text) text#if HAVE_LIMITS_H# include <limits.h>#endif#ifndef CHAR_BIT# define CHAR_BIT 8#endif#ifndef SIZE_MAX# define SIZE_MAX ((size_t) -1)#endif#ifndef UCHAR_MAX# define UCHAR_MAX ((unsigned char) -1)#endif#ifndef UINT_MAX# define UINT_MAX ((unsigned int) -1)#endif#if HAVE_C_BACKSLASH_A# define ALERT_CHAR '\a'#else# define ALERT_CHAR '\7'#endif#if HAVE_STDLIB_H# include <stdlib.h>#endif#if HAVE_STRING_H# include <string.h>#endif#if HAVE_WCHAR_H/* BSD/OS 4.1 wchar.h requires FILE and struct tm to be declared.  */# include <stdio.h># include <time.h># include <wchar.h>#endif#if !HAVE_MBRTOWC/* Disable multibyte processing entirely.  Since MB_CUR_MAX is 1, the   other macros are defined only for documentation and to satisfy C   syntax.  */# undef MB_CUR_MAX# define MB_CUR_MAX 1# define mbrtowc(pwc, s, n, ps) ((*(pwc) = *(s)) != 0)# define mbsinit(ps) 1# define iswprint(wc) ISPRINT ((unsigned char) (wc))#endif#ifndef iswprint# if HAVE_WCTYPE_H#  include <wctype.h># endif# if !defined iswprint && !HAVE_ISWPRINT#  define iswprint(wc) 1# endif#endif#define INT_BITS (sizeof (int) * CHAR_BIT)#if defined (STDC_HEADERS) || (!defined (isascii) && !defined (HAVE_ISASCII))# define IN_CTYPE_DOMAIN(c) 1#else# define IN_CTYPE_DOMAIN(c) isascii(c)#endif/* Undefine to protect against the definition in wctype.h of solaris2.6.   */#undef ISPRINT#define ISPRINT(c) (IN_CTYPE_DOMAIN (c) && isprint (c))struct quoting_options{  /* Basic quoting style.  */  enum quoting_style style;  /* Quote the characters indicated by this bit vector even if the     quoting style would not normally require them to be quoted.  */  int quote_these_too[(UCHAR_MAX / INT_BITS) + 1];};/* Names of quoting styles.  */char const *const quoting_style_args[] ={  "literal",  "shell",  "shell-always",  "c",  "escape",  "locale",  "clocale",  0};/* Correspondences to quoting style names.  */enum quoting_style const quoting_style_vals[] ={  literal_quoting_style,  shell_quoting_style,  shell_always_quoting_style,  c_quoting_style,  escape_quoting_style,  locale_quoting_style,  clocale_quoting_style};/* The default quoting options.  */static struct quoting_options default_quoting_options;/* Allocate a new set of quoting options, with contents initially identical   to O if O is not null, or to the default if O is null.   It is the caller's responsibility to free the result.  */struct quoting_options *clone_quoting_options (struct quoting_options *o){  struct quoting_options *p    = (struct quoting_options *) xmalloc (sizeof (struct quoting_options));  *p = *(o ? o : &default_quoting_options);  return p;}/* Get the value of O's quoting style.  If O is null, use the default.  */enum quoting_styleget_quoting_style (struct quoting_options *o){  return (o ? o : &default_quoting_options)->style;}/* In O (or in the default if O is null),   set the value of the quoting style to S.  */voidset_quoting_style (struct quoting_options *o, enum quoting_style s){  (o ? o : &default_quoting_options)->style = s;}/* In O (or in the default if O is null),   set the value of the quoting options for character C to I.   Return the old value.  Currently, the only values defined for I are   0 (the default) and 1 (which means to quote the character even if   it would not otherwise be quoted).  */intset_char_quoting (struct quoting_options *o, char c, int i){  unsigned char uc = c;  int *p = (o ? o : &default_quoting_options)->quote_these_too + uc / INT_BITS;  int shift = uc % INT_BITS;  int r = (*p >> shift) & 1;  *p ^= ((i & 1) ^ r) << shift;  return r;}/* MSGID approximates a quotation mark.  Return its translation if it   has one; otherwise, return either it or "\"", depending on S.  */static char const *gettext_quote (char const *msgid, enum quoting_style s){  char const *translation = _(msgid);  if (translation == msgid && s == clocale_quoting_style)    translation = "\"";  return translation;}/* Place into buffer BUFFER (of size BUFFERSIZE) a quoted version of   argument ARG (of size ARGSIZE), using QUOTING_STYLE and the   non-quoting-style part of O to control quoting.   Terminate the output with a null character, and return the written   size of the output, not counting the terminating null.   If BUFFERSIZE is too small to store the output string, return the   value that would have been returned had BUFFERSIZE been large enough.   If ARGSIZE is -1, use the string length of the argument for ARGSIZE.   This function acts like quotearg_buffer (BUFFER, BUFFERSIZE, ARG,   ARGSIZE, O), except it uses QUOTING_STYLE instead of the quoting   style specified by O, and O may not be null.  */static size_tquotearg_buffer_restyled (char *buffer, size_t buffersize,			  char const *arg, size_t argsize,			  enum quoting_style quoting_style,			  struct quoting_options const *o){  size_t i;  size_t len = 0;  char const *quote_string = 0;  size_t quote_string_len = 0;  int backslash_escapes = 0;  int unibyte_locale = MB_CUR_MAX == 1;#define STORE(c) \    do \      { \	if (len < buffersize) \	  buffer[len] = (c); \	len++; \      } \    while (0)  switch (quoting_style)    {    case c_quoting_style:      STORE ('"');      backslash_escapes = 1;      quote_string = "\"";      quote_string_len = 1;      break;    case escape_quoting_style:      backslash_escapes = 1;      break;    case locale_quoting_style:    case clocale_quoting_style:      {	/* Get translations for open and closing quotation marks.	   The message catalog should translate "`" to a left	   quotation mark suitable for the locale, and similarly for	   "'".  If the catalog has no translation,	   locale_quoting_style quotes `like this', and	   clocale_quoting_style quotes "like this".	   For example, an American English Unicode locale should	   translate "`" to U+201C (LEFT DOUBLE QUOTATION MARK), and	   should translate "'" to U+201D (RIGHT DOUBLE QUOTATION	   MARK).  A British English Unicode locale should instead	   translate these to U+2018 (LEFT SINGLE QUOTATION MARK) and	   U+2019 (RIGHT SINGLE QUOTATION MARK), respectively.  */	char const *left = gettext_quote (N_("`"), quoting_style);	char const *right = gettext_quote (N_("'"), quoting_style);	for (quote_string = left; *quote_string; quote_string++)	  STORE (*quote_string);	backslash_escapes = 1;	quote_string = right;	quote_string_len = strlen (quote_string);      }      break;    case shell_always_quoting_style:      STORE ('\'');      quote_string = "'";      quote_string_len = 1;      break;    default:      break;    }  for (i = 0;  ! (argsize == (size_t) -1 ? arg[i] == '\0' : i == argsize);  i++)    {      unsigned char c;      unsigned char esc;      if (backslash_escapes	  && quote_string_len	  && i + quote_string_len <= argsize	  && memcmp (arg + i, quote_string, quote_string_len) == 0)	STORE ('\\');      c = arg[i];      switch (c)	{	case '\0':	  if (backslash_escapes)	    {	      STORE ('\\');	      STORE ('0');	      STORE ('0');	      c = '0';	    }	  break;	case '?':	  switch (quoting_style)	    {	    case shell_quoting_style:	      goto use_shell_always_quoting_style;	    case c_quoting_style:	      if (i + 2 < argsize && arg[i + 1] == '?')		switch (arg[i + 2])		  {		  case '!': case '\'':		  case '(': case ')': case '-': case '/':		  case '<': case '=': case '>':		    /* Escape the second '?' in what would otherwise be		       a trigraph.  */		    i += 2;		    c = arg[i + 2];