summaryrefslogtreecommitdiff
path: root/src/stdlib/strtod.c
blob: c6f89e79252a8bcba4f8470474ded5b3fc88d3b3 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
#include <stdlib.h>
#include "shgetc.h"
#include "floatscan.h"
#include "stdio_impl.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);
}