source: asp3_tinet_ecnl_rx/trunk/musl-1.1.18/src/stdlib/strtod.c@ 337

#include <stdlib.h>
#include "shgetc.h"
#include "floatscan.h"
#include "stdio_impl.h"
#include "libc.h"

static long double strtox(const char *s, char **p, int prec)
{
        FILE f = {
                .buf = (void *)s, .rpos = (void *)s,
                .rend = (void *)-1, .lock = -1
        };
        shlim(&f, 0);
        long double y = __floatscan(&f, prec, 1);
        off_t cnt = shcnt(&f);
        if (p) *p = cnt ? (char *)s + cnt : (char *)s;
        return y;
}

float strtof(const char *restrict s, char **restrict p)
{
        return strtox(s, p, 0);
}

double strtod(const char *restrict s, char **restrict p)
{
        return strtox(s, p, 1);
}

long double strtold(const char *restrict s, char **restrict p)
{
        return strtox(s, p, 2);
}

weak_alias(strtof, strtof_l);
weak_alias(strtod, strtod_l);
weak_alias(strtold, strtold_l);
weak_alias(strtof, __strtof_l);
weak_alias(strtod, __strtod_l);
weak_alias(strtold, __strtold_l);