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#include "xzwrite.h"
static Yank yank_buffer;
extern Defaults defs;
static int read_index, write_index, highest;
void yank_init()
{
yank_buffer = (Yank) Malloc(defs.max_yanks*sizeof(YankRec),
"while allocating yank buffer", NULL);
(void) memset((char *) yank_buffer, 0, defs.max_yanks*sizeof(YankRec));
read_index = write_index = 0;
highest = -1;
}
Yank yank_prev()
{
if (highest == -1)
return NULL;
if (--read_index < 0) read_index = highest;
return &yank_buffer[read_index];
}
Yank yank_next()
{
if (highest == -1)
return NULL;
if (++read_index > highest) read_index = 0;
return &yank_buffer[read_index];
}
void yank_store(dest, msg)
Dest dest;
char *msg;
{
yank_buffer[write_index].dest = *dest;
if (yank_buffer[write_index].msg)
free(yank_buffer[write_index].msg);
yank_buffer[write_index].msg = (char *) Malloc(strlen(msg) + 1,
"while yanking message",
NULL);
strcpy(yank_buffer[write_index].msg, msg);
/*
* read_index = write_index + 1 so that if I follow the store by
* a yank_prev I will get the message just stored (since
* read_index is decremented before being used). If I do a
* yank_next, then read_index will be > highest and reset to zero.
*/
read_index = write_index + 1;
if (write_index > highest)
highest = write_index;
write_index = (write_index + 1) % defs.max_yanks;
}
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