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/* quotearg.c - quote arguments for output
Copyright (C) 1998 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 <sys/types.h>
#include <quotearg.h>
#include <xalloc.h>
#include <ctype.h>
#if defined (STDC_HEADERS) || (!defined (isascii) && !defined (HAVE_ISASCII))
# define ISASCII(c) 1
#else
# define ISASCII(c) isascii (c)
#endif
#ifdef isgraph
# define ISGRAPH(c) (ISASCII (c) && isgraph (c))
#else
# define ISGRAPH(c) (ISASCII (c) && isprint (c) && !isspace (c))
#endif
#if HAVE_LIMITS_H
# include <limits.h>
#endif
#ifndef CHAR_BIT
# define CHAR_BIT 8
#endif
#ifndef UCHAR_MAX
# define UCHAR_MAX ((unsigned char) -1)
#endif
#if HAVE_STDLIB_H
# include <stdlib.h>
#endif
#if HAVE_STRING_H
# include <string.h>
#endif
#define INT_BITS (sizeof (int) * CHAR_BIT)
struct quoting_options
{
/* Basic quoting style. */
enum quoting_style style;
/* Quote the chararacters indicated by this bit vector even if the
quoting style would not normally require them to be quoted. */
int quote_these_too[((UCHAR_MAX + 1) / INT_BITS
+ ((UCHAR_MAX + 1) % INT_BITS != 0))];
};
/* Names of quoting styles. */
char const *const quoting_style_args[] =
{
"literal", "shell", "shell-always", "c", "escape", 0
};
/* Allocate a new set of quoting options, with contents initially identical
to O if O is not null, or to a default value 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));
if (o)
*p = *o;
else
memset (p, 0, sizeof *p);
return p;
}
/* Get the value of O's quoting style. */
enum quoting_style
get_quoting_style (struct quoting_options *o)
{
return o->style;
}
/* In O, set the value of the quoting style to S. */
void
set_quoting_style (struct quoting_options *o, enum quoting_style s)
{
o->style = s;
}
/* In O, 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->quote_these_too + uc / INT_BITS;
int shift = uc % INT_BITS;
int r = (*p >> shift) & 1;
*p ^= ((i & 1) ^ r) << shift;
return r;
}
/* Place into buffer BUF (of size BUFSIZE) a quoted version of
argument ARG (of size ARGSIZE), using 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 BUFSIZE is too small to store the output string, return the
value that would have been returned had BUFSIZE been large enough.
If ARGSIZE is -1, use the string length of the argument for ARGSIZE. */
size_t
quotearg_buffer (char *buf, size_t bufsize,
char const *arg, size_t argsize,
struct quoting_options const *o)
{
unsigned char c;
size_t i;
size_t len;
int quote_mark;
enum quoting_style quoting_style = o->style;
#define STORE(c) do { if (len < bufsize) buf[len] = (c); len++; } while (0)
switch (quoting_style)
{
case shell_quoting_style:
if (! (argsize == -1 ? arg[0] == '\0' : argsize == 0))
{
switch (arg[0])
{
case '#': case '~':
break;
default:
len = 0;
for (i = 0; ; i++)
{
if (argsize == -1 ? arg[i] == '\0' : i == argsize)
goto done;
c = arg[i];
switch (c)
{
case '\t': case '\n': case ' ':
case '!': /* special in csh */
case '"': case '$': case '&': case '\'':
case '(': case ')': case '*': case ';':
case '<': case '>': case '?': case '[': case '\\':
case '^': /* special in old /bin/sh, e.g. SunOS 4.1.4 */
case '`': case '|':
goto needs_quoting;
}
if (o->quote_these_too[c / INT_BITS] & (1 << (c % INT_BITS)))
goto needs_quoting;
STORE (c);
}
needs_quoting:;
break;
}
}
/* Fall through. */
case shell_always_quoting_style:
quote_mark = '\'';
break;
case c_quoting_style:
quote_mark = '"';
break;
default:
quote_mark = 0;
break;
}
len = 0;
if (quote_mark)
STORE (quote_mark);
for (i = 0; ! (argsize == -1 ? arg[i] == '\0' : i == argsize); i++)
{
c = arg[i];
switch (quoting_style)
{
case literal_quoting_style:
break;
case shell_quoting_style:
case shell_always_quoting_style:
if (c == '\'')
{
STORE ('\'');
STORE ('\\');
STORE ('\'');
}
break;
case c_quoting_style:
case escape_quoting_style:
switch (c)
{
case '?': /* Do not generate trigraphs. */
case '\\': goto store_escape;
/* Not all C compilers know what \a means. */
case 7 : c = 'a'; goto store_escape;
case '\b': c = 'b'; goto store_escape;
case '\f': c = 'f'; goto store_escape;
case '\n': c = 'n'; goto store_escape;
case '\r': c = 'r'; goto store_escape;
case '\t': c = 't'; goto store_escape;
case '\v': c = 'v'; goto store_escape;
case ' ':
if (quoting_style == escape_quoting_style)
goto store_escape;
break;
case '"':
if (quoting_style == c_quoting_style)
goto store_escape;
break;
default:
if (!ISGRAPH (c))
{
STORE ('\\');
STORE ('0' + (c >> 6));
STORE ('0' + ((c >> 3) & 3));
c = '0' + (c & 3);
goto store_c;
}
break;
}
if (! (o->quote_these_too[c / INT_BITS] & (1 << (c % INT_BITS))))
goto store_c;
store_escape:
STORE ('\\');
}
store_c:
STORE (c);
}
if (quote_mark)
STORE (quote_mark);
done:
if (len < bufsize)
buf[len] = '\0';
return len;
}
/* Use storage slot N to return a quoted version of the string ARG.
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. */
static char *
quotearg_n_options (int n, char const *arg, struct quoting_options *options)
{
static unsigned nslots;
static struct slotvec
{
size_t size;
char *val;
} *slotvec;
if (nslots <= n)
{
int n1 = n + 1;
size_t s = n1 * sizeof (struct slotvec);
if (! (0 < n1 && n1 == s / sizeof (struct slotvec)))
abort ();
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, size);
quotearg_buffer (val, size, arg, (size_t) -1, options);
}
return val;
}
}
struct quoting_options quotearg_quoting_options;
char *
quotearg_n (int n, char const *arg)
{
return quotearg_n_options (n, arg, "earg_quoting_options);
}
char *
quotearg (char const *arg)
{
return quotearg_n (0, arg);
}
char *
quotearg_char (char const *arg, char ch)
{
struct quoting_options options;
options = quotearg_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, ':');
}
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