mirror of
https://github.com/jart/cosmopolitan.git
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65 lines
3.1 KiB
C
65 lines
3.1 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 2023 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/dce.h"
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#include "libc/errno.h"
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#include "libc/runtime/runtime.h"
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#include "libc/stdio/rand.h"
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#include "libc/stdio/stdio.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/o.h"
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/**
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* @fileoverview stronger mktemp for shell scripts, e.g.
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*
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* o//tool/build/mktemper.com ${TMPDIR:-/tmp}/fooXXXXXXXXXXXXX.o
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*
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* Is a good way to name an intermediate object file.
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*/
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static wontreturn void Die(const char *thing, const char *reason) {
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tinyprint(2, thing, ": ", reason, "\n", NULL);
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exit(1);
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}
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static wontreturn void DieSys(const char *thing) {
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perror(thing);
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exit(1);
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}
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int main(int argc, char *argv[]) {
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const char *prog = program_invocation_short_name;
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if (argc == 1) Die(prog, "missing argument");
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if (argc != 2) Die(prog, "too many arguments");
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char *template = argv[1];
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char *substring = strstr(template, "XXXXXXXXXXXXX");
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if (!substring) Die(prog, "template missing XXXXXXXXXXXXX substring");
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uint64_t w;
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if (getrandom(&w, 8, 0) != 8) DieSys("getrandom");
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for (int i = 0; i < 13; ++i) {
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substring[i] = "0123456789abcdefghijklmnopqrstuvwxyz"[w % 36];
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w /= 36;
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}
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int fd;
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if ((fd = open(template, O_RDWR | O_CREAT | O_EXCL, 0600)) == -1) {
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DieSys(template);
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}
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close(fd);
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tinyprint(1, template, "\n", NULL);
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}
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