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4f55271571
It was intended to make the API easier to use, but various automatic garbage collection all had flaws, and making the application periodically clean up temporary memory added cognitive load to using the API, and in many cases was it was difficult to restructure threaded code to handle this. So, we're largely going back to the original system, where the API returns allocated results and you free them. In addition, to solve the problems we originally wanted temporary memory for: * Short strings with a finite count, like device names, get stored in a per-thread string pool. * Events continue to use temporary memory internally, which is cleaned up on the next event processing cycle.
89 lines
2.8 KiB
C
89 lines
2.8 KiB
C
/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2024 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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#include "SDL_internal.h"
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/* convert the guid to a printable string */
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void SDL_GUIDToString(SDL_GUID guid, char *pszGUID, int cbGUID)
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{
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static const char k_rgchHexToASCII[] = "0123456789abcdef";
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int i;
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if ((!pszGUID) || (cbGUID <= 0)) {
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return;
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}
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for (i = 0; i < sizeof(guid.data) && i < (cbGUID - 1) / 2; i++) {
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/* each input byte writes 2 ascii chars, and might write a null byte. */
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/* If we don't have room for next input byte, stop */
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unsigned char c = guid.data[i];
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*pszGUID++ = k_rgchHexToASCII[c >> 4];
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*pszGUID++ = k_rgchHexToASCII[c & 0x0F];
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}
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*pszGUID = '\0';
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}
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/*-----------------------------------------------------------------------------
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* Purpose: Returns the 4 bit nibble for a hex character
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* Input : c -
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* Output : unsigned char
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*-----------------------------------------------------------------------------*/
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static unsigned char nibble(unsigned char 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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}
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if ((c >= 'A') && (c <= 'F')) {
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return c - 'A' + 0x0a;
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}
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if ((c >= 'a') && (c <= 'f')) {
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return c - 'a' + 0x0a;
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}
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/* received an invalid character, and no real way to return an error */
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/* AssertMsg1(false, "Q_nibble invalid hex character '%c' ", c); */
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return 0;
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}
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/* convert the string version of a guid to the struct */
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SDL_GUID SDL_StringToGUID(const char *pchGUID)
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{
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SDL_GUID guid;
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int maxoutputbytes = sizeof(guid);
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size_t len = SDL_strlen(pchGUID);
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Uint8 *p;
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size_t i;
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/* Make sure it's even */
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len = (len) & ~0x1;
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SDL_memset(&guid, 0x00, sizeof(guid));
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p = (Uint8 *)&guid;
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for (i = 0; (i < len) && ((p - (Uint8 *)&guid) < maxoutputbytes); i += 2, p++) {
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*p = (nibble((unsigned char)pchGUID[i]) << 4) | nibble((unsigned char)pchGUID[i + 1]);
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}
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return guid;
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}
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