mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-02-02 20:43:32 +00:00
3f49889841
- Fix preadv() and pwritev() for old distros - Introduce _npassert() and _unassert() macros - Prove that file locks work properly on Windows - Support fcntl(F_DUPFD_CLOEXEC) on more systems
70 lines
3.6 KiB
C
70 lines
3.6 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 2020 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/errno.h"
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#include "libc/fmt/conv.h"
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#include "libc/fmt/strtol.internal.h"
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#include "libc/limits.h"
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#include "libc/str/str.h"
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#include "libc/str/tab.internal.h"
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/**
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* Decodes signed integer from ASCII string.
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*
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* atoi 10⁸ 22𝑐 7𝑛𝑠
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* strtol 10⁸ 37𝑐 12𝑛𝑠
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* strtoul 10⁸ 35𝑐 11𝑛𝑠
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* wcstol 10⁸ 30𝑐 10𝑛𝑠
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* wcstoul 10⁸ 30𝑐 10𝑛𝑠
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* strtoimax 10⁸ 80𝑐 26𝑛𝑠
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* strtoumax 10⁸ 78𝑐 25𝑛𝑠
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* wcstoimax 10⁸ 77𝑐 25𝑛𝑠
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* wcstoumax 10⁸ 76𝑐 25𝑛𝑠
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*
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* @param s is a non-null nul-terminated string
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* @param endptr if non-null will always receive a pointer to the char
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* following the last one this function processed, which is usually
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* the NUL byte, or in the case of invalid strings, would point to
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* the first invalid character
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* @param base can be anywhere between [2,36] or 0 to auto-detect based
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* on the the prefixes 0 (octal), 0x (hexadecimal), 0b (binary), or
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* decimal (base 10) by default
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* @return the decoded signed saturated number
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*/
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long strtol(const char *s, char **endptr, int base) {
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char t = 0;
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long x = 0;
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int d, c = *s;
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CONSUME_SPACES(s, c);
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GET_SIGN(s, c, d);
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GET_RADIX(s, c, base);
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if ((c = kBase36[c & 255]) && --c < base) {
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if (!((t |= 1) & 2)) {
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do {
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if (__builtin_mul_overflow(x, base, &x) ||
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__builtin_add_overflow(x, c * d, &x)) {
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x = d > 0 ? LONG_MAX : LONG_MIN;
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errno = ERANGE;
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t |= 2;
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}
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} while ((c = kBase36[*++s & 255]) && --c < base);
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}
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}
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if (t && endptr) *endptr = s;
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return x;
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}
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