sbase/tee.c

52 lines
906 B
C

/* See LICENSE file for copyright and license details. */
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "util.h"
static void
usage(void)
{
eprintf("usage: %s [-a] [file...]\n", argv0);
}
int
main(int argc, char *argv[])
{
bool aflag = false;
char buf[BUFSIZ];
int i, nfps;
size_t n;
FILE **fps = NULL;
ARGBEGIN {
case 'a':
aflag = true;
break;
default:
usage();
} ARGEND;
nfps = argc + 1;
if(!(fps = calloc(nfps, sizeof *fps)))
eprintf("calloc:");
for(i = 0; argc > 0; argc--, argv++, i++)
if(!(fps[i] = fopen(*argv, aflag ? "a" : "w")))
eprintf("fopen %s:", *argv);
fps[i] = stdout;
while((n = fread(buf, 1, sizeof buf, stdin)) > 0) {
for(i = 0; i < nfps; i++) {
if(fwrite(buf, 1, n, fps[i]) != n)
eprintf("%s: write error:", buf);
}
}
if(ferror(stdin))
eprintf("<stdin>: read error:");
free(fps);
return 0;
}