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Minor sanity checking and tweaks in SDL_JoystickGetGUIDString().

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This commit is contained in:
Ryan C. Gordon 2012-12-11 18:46:09 -05:00
parent a0d481b870
commit 119f6eca4f
1 changed files with 8 additions and 8 deletions
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16
src/joystick/SDL_joystick.c
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@ -698,22 +698,22 @@ SDL_JoystickGUID SDL_JoystickGetGUID(SDL_Joystick * joystick)
void SDL_JoystickGetGUIDString( SDL_JoystickGUID guid, char *pszGUID, int cbGUID )
{
static const char k_rgchHexToASCII[] = "0123456789abcdef";
char *pchOut = NULL;
char *pchString = NULL;
int i;
pchOut = pszGUID;
for ( i = 0; i < sizeof(guid) && i < (cbGUID-1); i++ )
if ((pszGUID == NULL) || (cbGUID <= 0)) {
return;
}
for ( i = 0; i < sizeof(guid.data) && i < (cbGUID-1); i++ )
{
// each input byte writes 2 ascii chars, and might write a null byte.
// If we don't have room for next input byte, stop
unsigned char c = guid.data[i];
*pchOut++ = k_rgchHexToASCII[ c >> 4 ];
*pchOut++ = k_rgchHexToASCII[ c & 0x0F ];
*pszGUID++ = k_rgchHexToASCII[ c >> 4 ];
*pszGUID++ = k_rgchHexToASCII[ c & 0x0F ];
}
*pchOut = '\0';
*pszGUID = '\0';
}