/*
* Can you still remember input that looks like an execute @arg?
* @arg must end with a newline.
*/
int
seen_exec_input(char *arg)
{
size_t len = strlen(arg);
int n, i, j, ch;
unsigned char buf[RING_SIZE + 1];
assert(len && arg[len - 1] == '\n');
n = 1;
for (;;) {
/* find next line ending with arg */
n = ring_search(&recent_input, arg, n + 1);
if (n <= 0)
return 0;
/* extract command (same or previous line) */
i = n - 1;
if (ring_peek(&recent_input, i) == '\n')
i--;
j = sizeof(buf);
buf[--j] = 0;
for (; i >= 0 && (ch = ring_peek(&recent_input, i)) != '\n'; i--)
buf[--j] = ch;
/* compare command */
for (; isspace(buf[j]); j++) ;
for (i = j; buf[i] && !isspace(buf[i]); i++) ;
if (i - j >= 2 && !strncmp("execute", (char *)buf + j, i - j))
return 1;
}
}
/*
* Can you still remember a line of input that ends with @tail?
* It must end with a newline.
*/
int
seen_input(char *tail)
{
size_t len = strlen(tail);
assert(len && tail[len - 1] == '\n');
return ring_search(&recent_input, tail, 0) >= 0;
}
/*
* Remember input @inp for a while.
*/
void
save_input(char inp)
{
int eol;
while (ring_putc(&recent_input, inp) < 0) {
eol = ring_search(&recent_input, "\n", 0);
assert(eol >= 0);
ring_discard(&recent_input, eol + 1);
}
}
/*
* Can you still remember a line of input that ends with TAIL?
* It must end with a newline.
* Return non-zero iff TAIL can be remembered.
* Passing that value to forget_input() will forget all input up to
* and including this line.
*/
size_t
seen_input(char *tail)
{
size_t len = strlen(tail);
size_t remembered = ring_len(&recent_input);
int dist;
assert(len && tail[len - 1] == '\n');
dist = ring_search(&recent_input, tail);
if (dist < 0)
return 0;
assert(dist + len <= remembered && remembered <= saved_bytes);
return saved_bytes - remembered + dist + len;
}
/*
* Remember line of input INP for a while.
* It must end with a newline.
* Return value is suitable for forget_input(): it makes it forget all
* input up to and including this line.
*/
size_t
save_input(char *inp)
{
size_t len = strlen(inp);
int eol;
assert(len && inp[len - 1] == '\n');
while (ring_putm(&recent_input, inp, len) < 0) {
eol = ring_search(&recent_input, "\n");
assert(eol >= 0);
ring_discard(&recent_input, eol + 1);
}
saved_bytes += len;
return saved_bytes;
}
