148 lines
3.7 KiB
C++
148 lines
3.7 KiB
C++
/*
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Copyright (c) 2012, Arvid Norberg
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All rights reserved.
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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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* 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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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the distribution.
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* Neither the name of the author nor the names of its
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contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "libtorrent/config.hpp"
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#include "libtorrent/string_util.hpp"
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#include "libtorrent/random.hpp"
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#include <stdlib.h> // for malloc/free
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#include <string.h> // for strcpy/strlen
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namespace libtorrent
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{
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bool is_alpha(char c)
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{
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return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z');
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}
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bool is_digit(char c)
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{
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return c >= '0' && c <= '9';
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}
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bool is_print(char c)
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{
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return c >= 32 && c < 127;
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}
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bool is_space(char c)
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{
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const static char* ws = " \t\n\r\f\v";
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return strchr(ws, c) != 0;
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}
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char to_lower(char c)
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{
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return (c >= 'A' && c <= 'Z') ? c - 'A' + 'a' : c;
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}
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int split_string(char const** tags, int buf_size, char* in)
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{
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int ret = 0;
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char* i = in;
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for (;*i; ++i)
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{
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if (!is_print(*i) || is_space(*i))
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{
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*i = 0;
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if (ret == buf_size) return ret;
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continue;
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}
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if (i == in || i[-1] == 0)
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{
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tags[ret++] = i;
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}
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}
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return ret;
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}
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bool string_begins_no_case(char const* s1, char const* s2)
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{
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while (*s1 != 0)
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{
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if (to_lower(*s1) != to_lower(*s2)) return false;
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++s1;
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++s2;
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}
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return true;
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}
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bool string_equal_no_case(char const* s1, char const* s2)
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{
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while (to_lower(*s1) == to_lower(*s2))
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{
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if (*s1 == 0) return true;
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++s1;
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++s2;
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}
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return false;
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}
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// generate a url-safe random string
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void url_random(char* begin, char* end)
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{
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// http-accepted characters:
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// excluding ', since some buggy trackers don't support that
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static char const printable[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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"abcdefghijklmnopqrstuvwxyz-_.!~*()";
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// the random number
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while (begin != end)
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*begin++ = printable[random() % (sizeof(printable)-1)];
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}
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char* allocate_string_copy(char const* str)
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{
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if (str == 0) return 0;
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char* tmp = (char*)malloc(strlen(str) + 1);
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if (tmp == 0) return 0;
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strcpy(tmp, str);
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return tmp;
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}
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// 8-byte align pointer
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void* align_pointer(void* p)
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{
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int offset = uintptr_t(p) & 0x7;
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// if we're already aligned, don't do anything
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if (offset == 0) return p;
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// offset is how far passed the last aligned address
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// we are. We need to go forward to the next aligned
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// one. Since aligned addresses are 8 bytes apart, add
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// 8 - offset.
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return static_cast<char*>(p) + (8 - offset);
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}
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}
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