💾 Archived View for runjimmyrunrunyoufuckerrun.com › src › shuffle.c captured on 2021-12-17 at 13:26:06.
-=-=-=-=-=-=-
#include <u.h>
#include <libc.h>
#include <bio.h>
enum{MINREAD = 8192};
char *buf;
int i, c, sz = MINREAD;
void
slurp(char *f){
int fd, n;
fd = open(f, OREAD);
if(fd < 0) sysfatal("open: %r");
for(;;){
if(sz - i <= MINREAD){
buf = realloc(buf, sz <<= 1);
if(buf == nil) sysfatal("realloc: %r");
}
n = read(fd, buf + i, sz - i);
if(n == 0) break;
if(n < 0) sysfatal("read: %r");
while(n--) if(buf[i++] == '\n') c++;
}
close(fd);
if(i && buf[i - 1] != '\n'){
if(i == sz){
buf = realloc(buf, ++sz);
if(buf == nil) sysfatal("realloc: %r");
}
fprint(2, "adding newline at end of %s\n", f);
buf[i++] = '\n';
c++;
}
}
void
main(int argc, char *argv[]){
Biobuf *out;
int j, *start, *len;
if(argc == 1) slurp("/fd/0");
else while(--argc) slurp(argv[argc]);
if(c == 0) exits(nil);
start = calloc(c, sizeof(int));
len = calloc(c, sizeof(int));
if(start == nil || len == nil) sysfatal("calloc: %r");
len[j = 0] = --i;
while(i--){
if(buf[i] == '\n'){
len[j] -= i;
start[j] = i + 1;
len[++j] = i;
}
}
len[j]++;
assert(j + 1 == c);
out = Bfdopen(1, OWRITE);
if(out == nil) sysfatal("Bfdopen: %r");
srand(truerand());
while(c){
j = nrand(c--);
Bwrite(out, buf + start[j], len[j]);
start[j] = start[c];
len[j] = len[c];
}
exits(nil);
}