181 lines
4.8 KiB
C
181 lines
4.8 KiB
C
/* $NetBSD: shquote.c,v 1.1 2008/10/06 12:36:20 joerg Exp $ */
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/*
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* Copyright (c) 2001 Christopher G. Demetriou
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed for the
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* NetBSD Project. See http://www.NetBSD.org/ for
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* information about NetBSD.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* <<Id: LICENSE,v 1.2 2000/06/14 15:57:33 cgd Exp>>
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*/
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/*
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* Define SHQUOTE_USE_MULTIBYTE if you want shquote() to handle multibyte
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* characters using mbrtowc().
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*
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* Please DO NOT rip this #ifdef out of the code. It's also here to help
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* portability.
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*/
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#undef SHQUOTE_USE_MULTIBYTE
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#ifdef SHQUOTE_USE_MULTIBYTE
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#include <limits.h>
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#include <stdio.h>
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#include <wchar.h>
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#endif
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/*
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* shquote():
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*
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* Requotes arguments so that they'll be interpreted properly by the
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* shell (/bin/sh).
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*
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* Wraps single quotes around the string, and replaces single quotes
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* in the string with the sequence:
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* '\''
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*
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* Returns the number of characters required to hold the resulting quoted
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* argument.
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*
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* The buffer supplied is filled in and NUL-terminated. If 'bufsize'
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* indicates that the buffer is too short to hold the output string, the
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* first (bufsize - 1) bytes of quoted argument are filled in and the
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* buffer is NUL-terminated.
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*
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* Changes could be made to optimize the length of strings output by this
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* function:
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*
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* * if there are no metacharacters or whitespace in the input,
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* the output could be the input string.
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*/
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#ifdef SHQUOTE_USE_MULTIBYTE
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#define XLATE_OUTCH(x) wcrtomb(outch, (x), &mbso)
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#define XLATE_INCH() \
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do { \
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n = mbrtowc(&c, arg, MB_CUR_MAX, &mbsi); \
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} while (/*LINTED const cond*/0)
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#else
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#define XLATE_OUTCH(x) (outch[0] = (x), 1)
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#define XLATE_INCH() \
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do { \
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n = ((c = *arg) != '\0') ? 1 : 0; \
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} while (/*LINTED const cond*/0)
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#endif
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#define PUT(x) \
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do { \
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outchlen = XLATE_OUTCH(x); \
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if (outchlen == (size_t)-1) \
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goto bad; \
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rv += outchlen; \
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if (bufsize != 0) { \
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if (bufsize < outchlen || \
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(bufsize == outchlen && \
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outch[outchlen - 1] != '\0')) { \
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*buf = '\0'; \
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bufsize = 0; \
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} else { \
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memcpy(buf, outch, outchlen); \
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buf += outchlen; \
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bufsize -= outchlen; \
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} \
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} \
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} while (/*LINTED const cond*/0)
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size_t
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shquote(const char *arg, char *buf, size_t bufsize)
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{
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#ifdef SHQUOTE_USE_MULTIBYTE
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char outch[MB_LEN_MAX];
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mbstate_t mbsi, mbso;
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wchar_t c, lastc;
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size_t outchlen;
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#else
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char outch[1];
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char c, lastc;
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size_t outchlen;
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#endif
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size_t rv;
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int n;
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rv = 0;
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lastc = 0;
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#ifdef SHQUOTE_USE_MULTIBYTE
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memset(&mbsi, 0, sizeof mbsi);
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memset(&mbso, 0, sizeof mbso);
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#endif
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if (*arg != '\'')
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PUT('\'');
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for (;;) {
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XLATE_INCH();
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if (n <= 0)
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break;
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arg += n;
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lastc = c;
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if (c == '\'') {
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if (rv != 0)
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PUT('\'');
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PUT('\\');
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PUT('\'');
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for (;;) {
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XLATE_INCH();
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if (n <= 0 || c != '\'')
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break;
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PUT('\\');
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PUT('\'');
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arg += n;
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}
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if (n > 0)
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PUT('\'');
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} else
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PUT(c);
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}
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if (lastc != '\'')
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PUT('\'');
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/* Put multibyte or NUL terminator, but don't count the NUL. */
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PUT('\0');
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rv--;
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return rv;
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bad:
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/* A multibyte character encoding or decoding error occurred. */
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return (size_t)-1;
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}
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