sbase/tee.c

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