82 lines
2.1 KiB
C
82 lines
2.1 KiB
C
/*
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* Copyright (c) 2016 Apple Inc. All rights reserved.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
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*
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* This file contains Original Code and/or Modifications of Original Code
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* as defined in and that are subject to the Apple Public Source License
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* Version 2.0 (the 'License'). You may not use this file except in
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* compliance with the License. The rights granted to you under the License
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* may not be used to create, or enable the creation or redistribution of,
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* unlawful or unlicensed copies of an Apple operating system, or to
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* circumvent, violate, or enable the circumvention or violation of, any
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* terms of an Apple operating system software license agreement.
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*
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* Please obtain a copy of the License at
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* http://www.opensource.apple.com/apsl/ and read it before using this file.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
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* Please see the License for the specific language governing rights and
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* limitations under the License.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
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*/
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#include <libkern/libkern.h>
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static int
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hex2int(int c)
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{
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if (c >= '0' && c <= '9') {
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return c - '0';
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} else if (c >= 'A' && c <= 'F') {
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return c - 'A' + 10;
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} else if (c >= 'a' && c <= 'f') {
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return c - 'a' + 10;
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}
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return 0;
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}
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static bool
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isprint(int ch)
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{
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return ch >= 0x20 && ch <= 0x7e;
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}
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/*
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* In-place decode of URL percent-encoded str
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*/
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void
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url_decode(char *str)
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{
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if (!str) {
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return;
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}
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while (*str) {
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if (*str == '%') {
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char c = 0;
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char *esc = str++; /* remember the start of the escape sequence */
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if (*str) {
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c += hex2int(*str++);
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}
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if (*str) {
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c = (char)((c << 4) + hex2int(*str++));
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}
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if (isprint(c)) {
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/* overwrite the '%' with the new char, and bump the rest of the
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* string down a few characters */
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*esc++ = c;
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str = memmove(esc, str, strlen(str) + 1);
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}
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} else {
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str++;
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}
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}
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}
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