mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 11:37:35 +00:00
f0701d2a24
- Polyfill pselect() on Windows - Add -O NOFILE flag to pledge.com - Polyfill ppoll() on NetBSD, XNU, and Windows - Support negative numbers and errno in sizetol() - Add .RSS, .NOFILE, and .MAXCORE to Landlock Make - Fix issue with .PLEDGE preventing touching of output files - Add __watch() function (like ftrace) for logging memory changes
106 lines
3.9 KiB
C
106 lines
3.9 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 2021 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/fmt/conv.h"
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#include "libc/fmt/fmt.h"
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#include "libc/str/str.h"
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#include "libc/sysv/errfuns.h"
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static int GetExponent(int c) {
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switch (c) {
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case '\0':
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case ' ':
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case '\t':
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return 0;
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case 'k':
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case 'K':
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return 1;
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case 'm':
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case 'M':
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return 2;
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case 'g':
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case 'G':
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return 3;
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case 't':
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case 'T':
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return 4;
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case 'p':
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case 'P':
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return 5;
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case 'e':
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case 'E':
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return 6;
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default:
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return -1;
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}
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}
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/**
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* Converts size string to long.
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*
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* The following unit suffixes may be used
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*
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* - `k` or `K` for kilo (multiply by 𝑏¹)
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* - `m` or `M` for mega (multiply by 𝑏²)
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* - `g` or `G` for giga (multiply by 𝑏³)
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* - `t` or `T` for tera (multiply by 𝑏⁴)
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* - `p` or `P` for peta (multiply by 𝑏⁵)
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* - `e` or `E` for exa (multiply by 𝑏⁶)
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*
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* If a permitted alpha character is supplied, then any additional
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* characters after it (e.g. kbit, Mibit, TiB) are ignored. Spaces
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* before the integer are ignored, and overflows will be detected.
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*
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* Negative numbers are permissible, as well as a leading `+` sign. To
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* tell the difference between an error return and `-1` you must clear
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* `errno` before calling and test whether it changed.
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*
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* @param s is non-null nul-terminated input string
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* @param b is multiplier which should be 1000 or 1024
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* @return size greater than or equal 0 or -1 on error
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* @error EINVAL if error is due to bad syntax
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* @error EOVERFLOW if error is due to overflow
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*/
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long sizetol(const char *s, long b) {
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long x;
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int c, e, d;
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do {
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c = *s++;
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} while (c == ' ' || c == '\t');
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d = c == '-' ? -1 : 1;
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if (c == '-' || c == '+') c = *s++;
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if (!isdigit(c)) {
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return einval();
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}
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x = 0;
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do {
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if (__builtin_mul_overflow(x, 10, &x) ||
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__builtin_add_overflow(x, (c - '0') * d, &x)) {
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return eoverflow();
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}
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} while (isdigit((c = *s++)));
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if ((e = GetExponent(c)) == -1) {
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return einval();
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}
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while (e--) {
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if (__builtin_mul_overflow(x, b, &x)) {
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return eoverflow();
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}
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}
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return x;
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}
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