/* but the ANSI standard declaration uses int. */
void *
gs_memset(void *dest, register int ch, size_t len)
{
/*
* This procedure is used a lot to fill large regions of images,
* so we take some trouble to optimize it.
*/
register char *p = dest;
register size_t count = len;
ch &= 255;
if (len >= sizeof(long) * 3) {
long wd = (ch << 24) | (ch << 16) | (ch << 8) | ch;
while (ALIGNMENT_MOD(p, sizeof(long)))
*p++ = (char)ch, --count;
for (; count >= sizeof(long) * 4;
p += sizeof(long) * 4, count -= sizeof(long) * 4
)
((long *)p)[3] = ((long *)p)[2] = ((long *)p)[1] =
((long *)p)[0] = wd;
switch (count >> ARCH_LOG2_SIZEOF_LONG) {
case 3:
*((long *)p) = wd; p += sizeof(long);
case 2:
*((long *)p) = wd; p += sizeof(long);
case 1:
*((long *)p) = wd; p += sizeof(long);
count &= sizeof(long) - 1;
case 0:
default: /* can't happen */
DO_NOTHING;
}
}
/* Align a byte pointer on the next Nth byte */
static void
ptr_align_to(
const byte ** src, /* pointer to align */
unsigned alignment /* alignment, must be power of 2 */
)
{
*src += -(int)ALIGNMENT_MOD(*src, alignment) & (alignment - 1);
}