fusl/src/ctype/iswalpha.c

#include <wctype.h>
#include "libc.h"

static const unsigned char table[] = {
#include "alpha.h"
};

int iswalpha(wint_t wc) {
  if (wc < 0x20000U)
    return (table[table[wc >> 8] * 32 + ((wc & 255) >> 3)] >> (wc & 7)) & 1;
  if (wc < 0x2fffeU)
    return 1;
  return 0;
}

int __iswalpha_l(wint_t c, locale_t l) {
  return iswalpha(c);
}

weak_alias(__iswalpha_l, iswalpha_l);