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/* nbdkit
* Copyright Red Hat
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * 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.
*
* * Neither the name of Red Hat nor the names of its contributors may be
* used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''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 RED HAT OR
* CONTRIBUTORS 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.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "ascii-ctype.h"
#include "hexdigit.h"
/* Print str to fp, shell quoting if necessary. This comes from
* libguestfs, but was written by me so I'm relicensing it to a BSD
* license for nbdkit.
*/
void
shell_quote (const char *str, FILE *fp)
{
/* Note possible bug in this list (XXX):
* https://www.redhat.com/archives/libguestfs/2019-February/msg00036.html
*/
const char *safe_chars =
"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789.-_=,:/";
size_t i, len;
/* If the string consists only of safe characters, output it as-is. */
len = strlen (str);
if (len > 0 && len == strspn (str, safe_chars)) {
fputs (str, fp);
return;
}
/* Double-quote the string. */
fputc ('"', fp);
for (i = 0; i < len; ++i) {
switch (str[i]) {
case '$': case '`': case '\\': case '"':
fputc ('\\', fp);
/*FALLTHROUGH*/
default:
fputc (str[i], fp);
}
}
fputc ('"', fp);
}
/* Print str to fp, URI quoting if necessary.
* The resulting string is safe for use in a URI path or query component,
* and can be passed through the shell without further quoting.
*/
void
uri_quote (const char *str, FILE *fp)
{
/* safe_chars contains the RFC 3986 unreserved characters plus '/'. */
const char *safe_chars =
"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789.-_~/";
size_t i, len;
/* If the string consists only of safe characters, output it as-is. */
len = strlen (str);
if (len == strspn (str, safe_chars)) {
fputs (str, fp);
return;
}
for (i = 0; i < len; ++i) {
if (strchr (safe_chars, str[i]))
fputc (str[i], fp);
else
fprintf (fp, "%%%02X", str[i] & 0xff);
}
}
/* Print str to fp, quoting in a way similar to C strings, for example
* '\n' -> "\n".
*
* Note that we do not emit quotes around the string, and double
* quotes within the string are not escaped.
*/
void
c_string_quote (const char *str, FILE *fp)
{
size_t i;
char c;
for (i = 0; c = str[i], c != '\0'; ++i) {
switch (c) {
case '\\': fputc ('\\', fp); fputc ('\\', fp); break;
case '\a': fputc ('\\', fp); fputc ('a', fp); break;
case '\b': fputc ('\\', fp); fputc ('b', fp); break;
case '\f': fputc ('\\', fp); fputc ('f', fp); break;
case '\n': fputc ('\\', fp); fputc ('n', fp); break;
case '\r': fputc ('\\', fp); fputc ('r', fp); break;
case '\t': fputc ('\\', fp); fputc ('t', fp); break;
case '\v': fputc ('\\', fp); fputc ('v', fp); break;
default:
if (ascii_isprint (c))
fputc (c, fp);
else {
fputc ('\\', fp);
fputc ('x', fp);
fputc (hexchar (c >> 4), fp);
fputc (hexchar (c), fp);
}
}
}
}
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