putc vs buffering benchmark

gistfile1.txt

#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>

static FILE *fin, *fout;

static void byteperbyte(void)
{
	int c;

	while (EOF != (c=getc(fin))) putc(c, fout);
}

static void selfbuffer(void)
{
	#define BS 256
	char buf1[BS], buf2[BS];
	unsigned sz, i;

	while (sz=fread(buf1, 1, BS, fin)) {
		for (i = 0; i < sz; i++) buf2[i] = buf1[i];
		fwrite(buf2, sz, 1, fout);
	}
}

int main(int argc, char **argv)
{
	char method;
	const char *dest;

	if (argc != 3 || !(strchr("1b", method=*argv[1]))) {
		fprintf(stderr, "usage: %s [1|b] DEST\n", *argv);
		exit(1);
	}

	dest = argv[2];

	fin = fopen("/usr/share/dict/words", "r");
	if (!fin) { perror("fopen source"); abort(); }

	fout = fopen(dest, "w");
	if (!fout) { perror("fopen dest"); abort(); }

	switch (method) {
	case '1': byteperbyte(); break;
	case 'b': selfbuffer(); break;
	default: abort();
	}

	fflush(fout);

	if (ferror(fin)) fprintf(stderr, "input error\n");
	if (ferror(fout)) fprintf(stderr, "output error\n");

	fclose(fin);
	fclose(fout);
}