mirror of
https://github.com/fluencelabs/musl
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48 lines
1.1 KiB
C
48 lines
1.1 KiB
C
#include <wchar.h>
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#include <stdlib.h>
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#include <inttypes.h>
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#include <errno.h>
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uintmax_t wcstoumax(const wchar_t *s, wchar_t **p, int base)
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{
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/* Large enough for largest value in binary */
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char buf[sizeof(uintmax_t)*8+2];
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int sign = 0, skipped=0;
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if (!p) p = (wchar_t **)&s;
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if (base && (unsigned)base-2 > 36-2) {
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*p = (wchar_t *)s;
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errno = EINVAL;
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return 0;
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}
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/* Initial whitespace */
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for (; iswspace(*s); s++);
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/* Optional sign */
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if (*s == '-') sign = *s++;
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else if (*s == '+') s++;
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/* Skip leading zeros but don't allow leading zeros before "0x". */
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for (; s[0]=='0' && s[1]=='0'; s++) skipped=1;
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if (skipped && (base==0 || base==16) && (s[1]|32)=='x') {
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*p = (wchar_t *)(s+1);
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return 0;
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}
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/* Convert to normal char string so we can use strtoumax */
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buf[0] = sign;
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if (wcstombs(buf+!!sign, s, sizeof buf-1) < 0) return 0;
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buf[sizeof buf-1]=0;
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/* Compute final position */
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if (p) {
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if ((base==0 || base==16) && s[0]=='0' && (s[1]|32)=='x' && iswxdigit(s[2])) s+=2;
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for(;*s&&((unsigned)*s-'0'<base||((unsigned)*s|32)-'a'<base-10);s++);
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*p = (wchar_t *)s;
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}
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return strtoumax(buf, 0, base);
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}
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