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Use move to reduce copies in unibuffer_shift

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This commit is contained in:
Kp 2014-07-05 03:31:52 +00:00
parent b89a2328ca
commit 831ab8393d
1 changed files with 15 additions and 13 deletions
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28
similar/arch/sdl/key.cpp
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@ -24,6 +24,10 @@
#include "console.h"
#include "args.h"
#include "dxxsconf.h"
#include "compiler-array.h"
#include "compiler-begin.h"
static unsigned char Installed = 0;
//-------- Variable accessed by outside functions ---------
@ -330,28 +334,26 @@ static int key_ismodlck(int keycode)
unsigned char key_ascii()
{
static unsigned char unibuffer[KEY_BUFFER_SIZE] = { '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0' };
int i=0, offset=0, count=0;
using std::move;
using std::next;
static array<unsigned char, KEY_BUFFER_SIZE> unibuffer;
auto src = begin(unicode_frame_buffer);
auto dst = next(begin(unibuffer), strlen(reinterpret_cast<const char *>(&unibuffer[0])));
offset=strlen((const char*)unibuffer);
// move temporal chars from unicode_frame_buffer to empty space behind last unibuffer char (if any)
for (i=offset; i < KEY_BUFFER_SIZE; i++)
if (unicode_frame_buffer[count] != '\0')
for (; dst != end(unibuffer); ++dst)
if (*src != '\0')
{
unibuffer[i]=unicode_frame_buffer[count];
unicode_frame_buffer[count]='\0';
count++;
*dst = *src;
*src = '\0';
++src;
}
// unibuffer is not empty. store first char, remove it, shift all chars one step left and then print our char
if (unibuffer[0] != '\0')
{
unsigned char retval = unibuffer[0];
unsigned char unibuffer_shift[KEY_BUFFER_SIZE];
memset(unibuffer_shift,'\0',sizeof(unsigned char)*KEY_BUFFER_SIZE);
memcpy(unibuffer_shift,unibuffer+1,sizeof(unsigned char)*(KEY_BUFFER_SIZE-1));
memcpy(unibuffer,unibuffer_shift,sizeof(unsigned char)*KEY_BUFFER_SIZE);
*move(next(unibuffer.begin()), unibuffer.end(), unibuffer.begin()) = 0;
return retval;
}
else