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https://github.com/jart/cosmopolitan.git
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8ff48201ca
This change takes an entirely new approach to the incremental linking of pkzip executables. The assets created by zipobj.com are now treated like debug data. After a .com.dbg is compiled, fixupobj.com should be run, so it can apply fixups to the offsets and move the zip directory to the end of the file. Since debug data doesn't get objcopy'd, a new tool has been introduced called zipcopy.com which should be run after objcopy whenever a .com file is created. This is all automated by the `cosmocc` toolchain which is rapidly becoming the new recommended approach. This change also introduces the new C23 checked arithmetic macros.
55 lines
2.9 KiB
C
55 lines
2.9 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/struct/timespec.h"
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#include "libc/limits.h"
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#include "libc/stdckdint.h"
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/**
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* Reduces `ts` from 1e-9 to 1e-3 granularity w/ ceil rounding.
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*
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* This function uses ceiling rounding. For example, if `ts` is one
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* nanosecond, then one millisecond will be returned. Ceil rounding
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* is needed by many interfaces, e.g. setitimer(), because the zero
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* timestamp has a special meaning.
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*
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* This function also detects overflow in which case `INT64_MAX` or
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* `INT64_MIN` may be returned. The `errno` variable isn't changed.
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*
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* @return 64-bit scalar milliseconds since epoch
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*/
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int64_t timespec_tomillis(struct timespec ts) {
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int64_t ms;
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// reduce precision from nanos to millis
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if (ts.tv_nsec <= 999000000) {
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ts.tv_nsec = (ts.tv_nsec + 999999) / 1000000;
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} else {
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ts.tv_nsec = 0;
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if (ts.tv_sec < INT64_MAX) {
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ts.tv_sec += 1;
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}
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}
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// convert to scalar result
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if (!ckd_mul(&ms, ts.tv_sec, 1000ul) && !ckd_add(&ms, ms, ts.tv_nsec)) {
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return ms;
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} else if (ts.tv_sec < 0) {
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return INT64_MIN;
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} else {
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return INT64_MAX;
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}
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}
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