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// SPDX-License-Identifier: LGPL-3.0-or-later
#include <stdio.h>
#include <stdint.h>
int main() {
FILE *in = stdin;
FILE *out = stdout;
int c;
uint8_t out_i = 0;
char outbuf[256];
while(1) {
c = fgetc_unlocked(in);
if(c < 0) goto end;
uint8_t cmd = c;
for(size_t i = 0; i < 8; i++) {
if(cmd & 1) {
c = fgetc_unlocked(in);
if(c < 0) goto fail;
uint8_t offset = c;
offset += 1;
c = fgetc_unlocked(in);
if(c < 0) goto fail;
uint8_t len = c;
do {
c = outbuf[(uint8_t)(out_i - offset)];
outbuf[out_i++] = c;
c = fputc_unlocked(c, out);
if(c < 0) goto writefail;
} while(len--);
} else {
c = fgetc_unlocked(in);
if(c < 0) goto end;
outbuf[out_i++] = c;
c = fputc_unlocked(c, out);
if(c < 0) goto writefail;
}
cmd >>= 1;
}
}
end:
if(feof_unlocked(in)) return 0;
fail:
fprintf(stderr, ferror_unlocked(in) ? "Read Error: %m\n" : "Unexpected EOF\n");
return 1;
writefail:
fprintf(stderr, "Write Error: %m\n");
return 1;
}
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