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quotearg.c

/* 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

#include "quotearg.h"

#include "xalloc.h"

#include <ctype.h>
#include <errno.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>

#include "gettext.h"
#define _(msgid) gettext (msgid)
#define N_(msgid) msgid

#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 iswprint(wc) isprint ((unsigned char) (wc))
# undef HAVE_MBSINIT
#endif

#if !defined mbsinit && !HAVE_MBSINIT
# define mbsinit(ps) 1
#endif

#ifndef iswprint
# if HAVE_WCTYPE_H
#  include <wctype.h>
# endif
# if !defined iswprint && !HAVE_ISWPRINT
#  define iswprint(wc) 1
# endif
#endif

#ifndef SIZE_MAX
# define SIZE_MAX ((size_t) -1)
#endif

#define INT_BITS (sizeof (int) * CHAR_BIT)

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)
{
  int e = errno;
  struct quoting_options *p = xmalloc (sizeof *p);
  *p = *(o ? o : &default_quoting_options);
  errno = e;
  return p;
}

/* Get the value of O's quoting style.  If O is null, use the default.  */
enum quoting_style
get_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.  */
void
set_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).  */
int
set_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_t
quotearg_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_MAX ? 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.  */
                c = arg[i + 2];
                i += 2;
                STORE ('?');
                STORE ('\\');
                STORE ('?');
                break;
              }
            break;

          default:
            break;
          }
        break;

      case '\a': esc = 'a'; goto c_escape;
      case '\b': esc = 'b'; goto c_escape;
      case '\f': esc = 'f'; goto c_escape;
      case '\n': esc = 'n'; goto c_and_shell_escape;
      case '\r': esc = 'r'; goto c_and_shell_escape;
      case '\t': esc = 't'; goto c_and_shell_escape;
      case '\v': esc = 'v'; goto c_escape;
      case '\\': esc = c; goto c_and_shell_escape;

      c_and_shell_escape:
        if (quoting_style == shell_quoting_style)
          goto use_shell_always_quoting_style;
      c_escape:
        if (backslash_escapes)
          {
            c = esc;
            goto store_escape;
          }
        break;

      case '#': case '~':
        if (i != 0)
          break;
        /* Fall through.  */
      case ' ':
      case '!': /* special in bash */
      case '"': case '$': case '&':
      case '(': case ')': case '*': case ';':
      case '<': case '>': case '[':
      case '^': /* special in old /bin/sh, e.g. SunOS 4.1.4 */
      case '`': case '|':
        /* A shell special character.  In theory, '$' and '`' could
           be the first bytes of multibyte characters, which means
           we should check them with mbrtowc, but in practice this
           doesn't happen so it's not worth worrying about.  */
        if (quoting_style == shell_quoting_style)
          goto use_shell_always_quoting_style;
        break;

      case '\'':
        switch (quoting_style)
          {
          case shell_quoting_style:
            goto use_shell_always_quoting_style;

          case shell_always_quoting_style:
            STORE ('\'');
            STORE ('\\');
            STORE ('\'');
            break;

          default:
            break;
          }
        break;

      case '%': case '+': case ',': case '-': case '.': case '/':
      case '0': case '1': case '2': case '3': case '4': case '5':
      case '6': case '7': case '8': case '9': case ':': case '=':
      case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
      case 'G': case 'H': case 'I': case 'J': case 'K': case 'L':
      case 'M': case 'N': case 'O': case 'P': case 'Q': case 'R':
      case 'S': case 'T': case 'U': case 'V': case 'W': case 'X':
      case 'Y': case 'Z': case ']': case '_': case 'a': case 'b':
      case 'c': case 'd': case 'e': case 'f': case 'g': case 'h':
      case 'i': case 'j': case 'k': case 'l': case 'm': case 'n':
      case 'o': case 'p': case 'q': case 'r': case 's': case 't':
      case 'u': case 'v': case 'w': case 'x': case 'y': case 'z':
      case '{': case '}':
        /* These characters don't cause problems, no matter what the
           quoting style is.  They cannot start multibyte sequences.  */
        break;

      default:
        /* If we have a multibyte sequence, copy it until we reach
           its end, find an error, or come back to the initial shift
           state.  For C-like styles, if the sequence has
           unprintable characters, escape the whole sequence, since
           we can't easily escape single characters within it.  */
        {
          /* Length of multibyte sequence found so far.  */
          size_t m;

          int printable;

          if (unibyte_locale)
            {
            m = 1;
            printable = isprint (c);
            }
          else
            {
            mbstate_t mbstate;
            memset (&mbstate, 0, sizeof mbstate);

            m = 0;
            printable = 1;
            if (argsize == SIZE_MAX)
              argsize = strlen (arg);

            do
              {
                wchar_t w;
                size_t bytes = mbrtowc (&w, &arg[i + m],
                                  argsize - (i + m), &mbstate);
                if (bytes == 0)
                  break;
                else if (bytes == (size_t) -1)
                  {
                  printable = 0;
                  break;
                  }
                else if (bytes == (size_t) -2)
                  {
                  printable = 0;
                  while (i + m < argsize && arg[i + m])
                    m++;
                  break;
                  }
                else
                  {
                  if (! iswprint (w))
                    printable = 0;
                  m += bytes;
                  }
              }
            while (! mbsinit (&mbstate));
            }

          if (1 < m || (backslash_escapes && ! printable))
            {
            /* Output a multibyte sequence, or an escaped
               unprintable unibyte character.  */
            size_t ilim = i + m;

            for (;;)
              {
                if (backslash_escapes && ! printable)
                  {
                  STORE ('\\');
                  STORE ('0' + (c >> 6));
                  STORE ('0' + ((c >> 3) & 7));
                  c = '0' + (c & 7);
                  }
                if (ilim <= i + 1)
                  break;
                STORE (c);
                c = arg[++i];
              }

            goto store_c;
            }
        }
      }

      if (! (backslash_escapes
           && o->quote_these_too[c / INT_BITS] & (1 << (c % INT_BITS))))
      goto store_c;

    store_escape:
      STORE ('\\');

    store_c:
      STORE (c);
    }

  if (quote_string)
    for (; *quote_string; quote_string++)
      STORE (*quote_string);

  if (len < buffersize)
    buffer[len] = '\0';
  return len;

 use_shell_always_quoting_style:
  return quotearg_buffer_restyled (buffer, buffersize, arg, argsize,
                           shell_always_quoting_style, o);
}

/* Place into buffer BUFFER (of size BUFFERSIZE) a quoted version of
   argument ARG (of size ARGSIZE), using O to control quoting.
   If O is null, use the default.
   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.  */
size_t
quotearg_buffer (char *buffer, size_t buffersize,
             char const *arg, size_t argsize,
             struct quoting_options const *o)
{
  struct quoting_options const *p = o ? o : &default_quoting_options;
  int e = errno;
  size_t r = quotearg_buffer_restyled (buffer, buffersize, arg, argsize,
                               p->style, p);
  errno = e;
  return r;
}

/* Use storage slot N to return a quoted version of argument ARG.
   ARG is of size ARGSIZE, but if that is -1, ARG is a null-terminated string.
   OPTIONS specifies the quoting options.
   The returned value points to static storage that can be
   reused by the next call to this function with the same value of N.
   N must be nonnegative.  N is deliberately declared with type "int"
   to allow for future extensions (using negative values).  */
static char *
quotearg_n_options (int n, char const *arg, size_t argsize,
                struct quoting_options const *options)
{
  int e = errno;

  /* Preallocate a slot 0 buffer, so that the caller can always quote
     one small component of a "memory exhausted" message in slot 0.  */
  static char slot0[256];
  static unsigned int nslots = 1;
  unsigned int n0 = n;
  struct slotvec
    {
      size_t size;
      char *val;
    };
  static struct slotvec slotvec0 = {sizeof slot0, slot0};
  static struct slotvec *slotvec = &slotvec0;

  if (n < 0)
    abort ();

  if (nslots <= n0)
    {
      unsigned int n1 = n0 + 1;

      if (xalloc_oversized (n1, sizeof *slotvec))
      xalloc_die ();

      if (slotvec == &slotvec0)
      {
        slotvec = xmalloc (sizeof *slotvec);
        *slotvec = slotvec0;
      }
      slotvec = xrealloc (slotvec, n1 * sizeof *slotvec);
      memset (slotvec + nslots, 0, (n1 - nslots) * sizeof *slotvec);
      nslots = n1;
    }

  {
    size_t size = slotvec[n].size;
    char *val = slotvec[n].val;
    size_t qsize = quotearg_buffer (val, size, arg, argsize, options);

    if (size <= qsize)
      {
      slotvec[n].size = size = qsize + 1;
      if (val != slot0)
        free (val);
      slotvec[n].val = val = xmalloc (size);
      quotearg_buffer (val, size, arg, argsize, options);
      }

    errno = e;
    return val;
  }
}

char *
quotearg_n (int n, char const *arg)
{
  return quotearg_n_options (n, arg, SIZE_MAX, &default_quoting_options);
}

char *
quotearg (char const *arg)
{
  return quotearg_n (0, arg);
}

/* Return quoting options for STYLE, with no extra quoting.  */
static struct quoting_options
quoting_options_from_style (enum quoting_style style)
{
  struct quoting_options o;
  o.style = style;
  memset (o.quote_these_too, 0, sizeof o.quote_these_too);
  return o;
}

char *
quotearg_n_style (int n, enum quoting_style s, char const *arg)
{
  struct quoting_options const o = quoting_options_from_style (s);
  return quotearg_n_options (n, arg, SIZE_MAX, &o);
}

char *
quotearg_n_style_mem (int n, enum quoting_style s,
                  char const *arg, size_t argsize)
{
  struct quoting_options const o = quoting_options_from_style (s);
  return quotearg_n_options (n, arg, argsize, &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, SIZE_MAX, &options);
}

char *
quotearg_colon (char const *arg)
{
  return quotearg_char (arg, ':');
}

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