mirror of
https://github.com/jart/cosmopolitan.git
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39bf41f4eb
- Python static hello world now 1.8mb
- Python static fully loaded now 10mb
- Python HTTPS client now uses MbedTLS
- Python REPL now completes import stmts
- Increase stack size for Python for now
- Begin synthesizing posixpath and ntpath
- Restore Python \N{UNICODE NAME} support
- Restore Python NFKD symbol normalization
- Add optimized code path for Intel SHA-NI
- Get more Python unit tests passing faster
- Get Python help() pagination working on NT
- Python hashlib now supports MbedTLS PBKDF2
- Make memcpy/memmove/memcmp/bcmp/etc. faster
- Add Mersenne Twister and Vigna to LIBC_RAND
- Provide privileged __printf() for error code
- Fix zipos opendir() so that it reports ENOTDIR
- Add basic chmod() implementation for Windows NT
- Add Cosmo's best functions to Python cosmo module
- Pin function trace indent depth to that of caller
- Show memory diagram on invalid access in MODE=dbg
- Differentiate stack overflow on crash in MODE=dbg
- Add stb_truetype and tools for analyzing font files
- Upgrade to UNICODE 13 and reduce its binary footprint
- COMPILE.COM now logs resource usage of build commands
- Start implementing basic poll() support on bare metal
- Set getauxval(AT_EXECFN) to GetModuleFileName() on NT
- Add descriptions to strerror() in non-TINY build modes
- Add COUNTBRANCH() macro to help with micro-optimizations
- Make error / backtrace / asan / memory code more unbreakable
- Add fast perfect C implementation of μ-Law and a-Law audio codecs
- Make strtol() functions consistent with other libc implementations
- Improve Linenoise implementation (see also github.com/jart/bestline)
- COMPILE.COM now suppresses stdout/stderr of successful build commands
59 lines
3 KiB
C
59 lines
3 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/limits.h"
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#include "libc/str/str.h"
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/**
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* Decodes decimal 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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* @return the decoded signed saturated integer
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*/
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int atoi(const char *s) {
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int x, c, 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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for (x = 0; isdigit(c); c = *s++) {
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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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errno = ERANGE;
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if (d > 0) {
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return INT_MAX;
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} else {
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return INT_MIN;
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}
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}
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}
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return x;
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}
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