mirror of
https://github.com/jart/cosmopolitan.git
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79 lines
3.4 KiB
C
79 lines
3.4 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2022 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/calls.h"
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#include "libc/errno.h"
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#include "libc/fmt/itoa.h"
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#include "libc/mem/copyfd.internal.h"
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#include "libc/runtime/runtime.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/ex.h"
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#include "libc/sysv/consts/o.h"
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#include "third_party/getopt/getopt.h"
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char buf[512];
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static void Write(const char *s, ...) {
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va_list va;
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va_start(va, s);
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do {
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write(2, s, strlen(s));
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} while ((s = va_arg(va, const char *)));
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va_end(va);
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}
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wontreturn void SysExit(int rc, const char *call, const char *thing) {
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int err;
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char ibuf[12];
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const char *estr;
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err = errno;
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FormatInt32(ibuf, err);
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estr = _strerdoc(err);
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if (!estr) estr = "EUNKNOWN";
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Write(thing, ": ", call, "() failed: ", estr, " (", ibuf, ")\n", 0);
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exit(rc);
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}
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int main(int argc, char *argv[]) {
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int i, opt;
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const char *outpath = "/dev/stdout";
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while ((opt = getopt(argc, argv, "o:")) != -1) {
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switch (opt) {
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case 'o':
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outpath = optarg;
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break;
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default:
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return 1;
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}
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}
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int out = open(outpath, O_WRONLY | O_CREAT | O_TRUNC, 0644);
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if (out == -1) SysExit(2, "open", outpath);
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for (i = optind; i < argc; ++i) {
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int in = open(argv[i], O_RDONLY);
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if (in == -1) SysExit(3, "open", argv[i]);
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for (;;) {
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ssize_t rc = read(in, buf, 512);
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if (rc == -1) SysExit(3, "read", argv[i]);
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if (!rc) break;
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ssize_t rc2 = write(out, buf, rc);
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if (rc2 != rc) SysExit(4, "write", outpath);
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}
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if (close(in) == -1) SysExit(5, "close", argv[i]);
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}
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if (close(out) == -1) SysExit(6, "close", outpath);
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}
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