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denoland-deno/cli/bench/stdio/stdio.c

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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
// From https://github.com/just-js/benchmarks/tree/main/01-stdio
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
int main(int argc, char *argv[]) {
unsigned int blocksize = 65536;
if (argc == 2) {
blocksize = atoi(argv[1]);
}
char buf[blocksize];
unsigned long size = 0;
unsigned int reads = 0;
int n = read(STDIN_FILENO, buf, blocksize);
while (n > 0) {
reads++;
size += n;
n = read(STDIN_FILENO, buf, blocksize);
}
if (n < 0) {
fprintf(stderr, "read: %s (%i)\n", strerror(errno), errno);
exit(1);
}
fprintf(stdout, "size %lu reads %u blocksize %u\n", size, reads, blocksize);
}