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