freebsd-skq/gnu/usr.bin/sort/xstrtod.c
Andrey A. Chernov 4267c49d9e Revive GNU sort
2002-04-08 12:12:07 +00:00

50 lines
842 B
C

/* $FreeBSD$ */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifdef STDC_HEADERS
#include <stdlib.h>
#else
double strtod ();
#endif
#include <errno.h>
#include <stdio.h>
#include <limits.h>
#include <ctype.h>
#include "xstrtod.h"
int
xstrtod (str, ptr, result)
const char *str;
const char **ptr;
double *result;
{
double val;
char *terminator;
int fail;
fail = 0;
errno = 0;
val = strtod (str, &terminator);
/* Having a non-zero terminator is an error only when PTR is NULL. */
if (terminator == str || (ptr == NULL && *terminator != '\0'))
fail = 1;
else
{
/* Allow underflow (in which case strtod returns zero),
but flag overflow as an error. */
if (val != 0.0 && errno == ERANGE)
fail = 1;
}
if (ptr != NULL)
*ptr = terminator;
*result = val;
return fail;
}