70 lines
2.7 KiB
C
70 lines
2.7 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
|
|
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
|
│ Copyright 2020 Justine Alexandra Roberts Tunney │
|
|
│ │
|
|
│ This program is free software; you can redistribute it and/or modify │
|
|
│ it under the terms of the GNU General Public License as published by │
|
|
│ the Free Software Foundation; version 2 of the License. │
|
|
│ │
|
|
│ This program is distributed in the hope that it will be useful, but │
|
|
│ WITHOUT ANY WARRANTY; without even the implied warranty of │
|
|
│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
|
|
│ General Public License for more details. │
|
|
│ │
|
|
│ You should have received a copy of the GNU General Public License │
|
|
│ along with this program; if not, write to the Free Software │
|
|
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
|
|
│ 02110-1301 USA │
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
|
#include "libc/fmt/conv.h"
|
|
#include "libc/str/str.h"
|
|
|
|
intmax_t wcstoimax(const wchar_t *s, wchar_t **endptr, int base) {
|
|
intmax_t res = 0;
|
|
int neg = 0;
|
|
|
|
while (iswspace(*s)) {
|
|
s++;
|
|
}
|
|
|
|
switch (*s) {
|
|
case '-':
|
|
neg = 1;
|
|
/* fallthrough */
|
|
case '+':
|
|
s++;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if (!base) {
|
|
if (*s == '0') {
|
|
s++;
|
|
if (*s == 'x' || *s == 'X') {
|
|
s++;
|
|
base = 16;
|
|
} else if (*s == 'b' || *s == 'B') {
|
|
s++;
|
|
base = 2;
|
|
} else {
|
|
base = 8;
|
|
}
|
|
} else {
|
|
base = 10;
|
|
}
|
|
}
|
|
|
|
for (;;) {
|
|
unsigned diglet = kBase36[*s];
|
|
if (!diglet || diglet > base) break;
|
|
s++;
|
|
res *= base; /* needs __muloti4() w/ clang */
|
|
res -= diglet - 1;
|
|
}
|
|
|
|
if (endptr) *endptr = (wchar_t *)s;
|
|
return neg ? res : -res;
|
|
}
|