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/* See LICENSE file for copyright and license details. */
#include "stream.h"
#include "util.h"
#include <inttypes.h>
#include <string.h>
#include <unistd.h>
USAGE("(skipped-frames | +included-frames) ...")
static int
process_frame(struct stream *stream, int include, size_t rown)
{
size_t h, n;
int anything = 0;
for (h = stream->height; h;) {
h--;
for (n = rown; n; n -= stream->ptr) {
stream->ptr = 0;
if (!eread_stream(stream, n))
goto done;
anything = 1;
if (include)
ewriteall(STDOUT_FILENO, stream->buf, stream->ptr, "<stdout>");
}
}
done:
if (anything && (h || n || stream->frames))
eprintf("%s: is shorted than expected\n", stream->file);
return !anything;
}
int
main(int argc, char *argv[])
{
struct stream stream;
int i, include;
size_t f, n, rown, total = 0;
char *includes;
size_t *ns;
UNOFLAGS(!argc);
stream.fd = STDIN_FILENO;
stream.file = "<stdin>";
einit_stream(&stream);
includes = emalloc((size_t)argc);
ns = ecalloc((size_t)argc, sizeof(*ns));
for (i = 0; i < argc; i++) {
include = argv[i][0] == '+';
n = etozu_arg(include ? "included frame count" : "skipped frame count",
argv[i] + include, 0, SIZE_MAX);
ns[i] = n;
includes[i] = (char)include;
}
if (!total)
eprintf("null pattern is not allowed");
for (i = 0, total = 0, f = stream.frames;; i = (i + 1) % argc) {
include = (int)includes[i];
for (n = ns[i]; n-- && f--;)
total += (size_t)include;
}
stream.frames = total;
fprint_stream_head(stdout, &stream);
efflush(stdout, "<stdout>");
rown = stream.width * stream.pixel_size;
for (i = 0;; i = (i + 1) % argc) {
include = (int)includes[i];
n = ns[i];
while (n-- && process_frame(&stream, include, rown));
}
free(includes);
free(ns);
return 0;
}
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