70 lines
2.7 KiB
C
70 lines
2.7 KiB
C
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/*-*- 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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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/fmt/conv.h"
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#include "libc/str/str.h"
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intmax_t wcstoimax(const wchar_t *s, wchar_t **endptr, int base) {
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intmax_t res = 0;
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int neg = 0;
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while (iswspace(*s)) {
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s++;
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}
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switch (*s) {
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case '-':
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neg = 1;
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/* fallthrough */
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case '+':
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s++;
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break;
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default:
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break;
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}
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if (!base) {
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if (*s == '0') {
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s++;
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if (*s == 'x' || *s == 'X') {
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s++;
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base = 16;
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} else if (*s == 'b' || *s == 'B') {
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s++;
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base = 2;
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} else {
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base = 8;
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}
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} else {
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base = 10;
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}
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}
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for (;;) {
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unsigned diglet = kBase36[*s];
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if (!diglet || diglet > base) break;
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s++;
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res *= base; /* needs __muloti4() w/ clang */
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res -= diglet - 1;
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}
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if (endptr) *endptr = (wchar_t *)s;
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return neg ? res : -res;
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}
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