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/* qmark.c -- quote 'dangerous' filenames
Derived from coreutils' ls.c.
Copyright (C) 1985-2024 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 3 of the License, 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, see <https://www.gnu.org/licenses/>.
*/
/* config.h must be included first. */
#include <config.h>
/* system headers. */
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include <wchar.h>
/* gnulib headers would go here if any needed to be included. */
/* find headers. */
#include "printquoted.h"
/*
This comment, IN_CTYPE_DOMAIN and ISPRINT were borrowed from
coreutils at Sun Jun 5 21:17:40 2005 UTC.
Jim Meyering writes:
"... Some ctype macros are valid only for character codes that
isascii says are ASCII (SGI's IRIX-4.0.5 is one such system --when
using /bin/cc or gcc but without giving an ansi option). So, all
ctype uses should be through macros like ISPRINT... If
STDC_HEADERS is defined, then autoconf has verified that the ctype
macros don't need to be guarded with references to isascii. ...
Defining isascii to 1 should let any compiler worth its salt
eliminate the && through constant folding."
Bruno Haible adds:
"... Furthermore, isupper(c) etc. have an undefined result if c is
outside the range -1 <= c <= 255. One is tempted to write isupper(c)
with c being of type `char', but this is wrong if c is an 8-bit
character >= 128 which gets sign-extended to a negative value.
The macro ISUPPER protects against this as well."
(Actually that rule of ISUPPER is now taken by to_uchar).
*/
#if STDC_HEADERS
# define IN_CTYPE_DOMAIN(c) 1
#else
# define IN_CTYPE_DOMAIN(c) isascii(c)
#endif
/* ISPRINT is defined in <sys/euc.h> on at least Solaris2.6 systems. */
#undef ISPRINT
#define ISPRINT(c) (IN_CTYPE_DOMAIN (c) && isprint (c))
/* Convert a possibly-signed character to an unsigned character. This is
* a bit safer than casting to unsigned char, since it catches some type
* errors that the cast doesn't.
*
* This code taken from coreutils' system.h header at
* Sun Jun 5 21:05:21 2005 UTC.
*/
static inline unsigned char to_uchar (char ch)
{
return ch;
}
static size_t
unibyte_qmark_chars (char *buf, size_t len)
{
char *p = buf;
char const *plimit = buf + len;
while (p < plimit)
{
if (! ISPRINT (to_uchar (*p)))
*p = '?';
p++;
}
return len;
}
/* Scan BUF, replacing any dangerous-looking characters with question
* marks. This code is taken from the ls.c file in coreutils as at
* Sun Jun 5 20:51:54 2005 UTC.
*
* This function may shrink the buffer. Either way, the new length
* is returned.
*/
size_t
qmark_chars (char *buf, size_t len)
{
if (MB_CUR_MAX <= 1)
{
return unibyte_qmark_chars (buf, len);
}
else
{
char const *p = buf;
char const *plimit = buf + len;
char *q = buf;
while (p < plimit)
switch (*p)
{
case ' ': case '!': case '"': case '#': case '%':
case '&': case '\'': case '(': case ')': 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 '<': case '=': 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 ']': 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 '}': case '~':
/* These characters are printable ASCII characters. */
*q++ = *p++;
break;
default:
/* If we have a multibyte sequence, copy it until we
reach its end, replacing each non-printable multibyte
character with a single question mark. */
{
mbstate_t mbstate;
memset (&mbstate, 0, sizeof mbstate);
do
{
wchar_t wc;
size_t bytes;
int w;
bytes = mbrtowc (&wc, p, plimit - p, &mbstate);
if (bytes == (size_t) -1)
{
/* An invalid multibyte sequence was
encountered. Skip one input byte, and
put a question mark. */
p++;
*q++ = '?';
break;
}
if (bytes == (size_t) -2)
{
/* An incomplete multibyte character
at the end. Replace it entirely with
a question mark. */
p = plimit;
*q++ = '?';
break;
}
if (bytes == 0)
/* A null wide character was encountered. */
bytes = 1;
w = wcwidth (wc);
if (w >= 0)
{
/* A printable multibyte character.
Keep it. */
for (; bytes > 0; --bytes)
*q++ = *p++;
}
else
{
/* An unprintable multibyte character.
Replace it entirely with a question
mark. */
p += bytes;
*q++ = '?';
}
}
while (! mbsinit (&mbstate));
}
break;
}
/* The buffer may have shrunk. */
len = q - buf;
return len;
}
}
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