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/* float-ok.c: test if a string is a valid floating-point number.
Copyright (C) 1992 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include "config.h"
#include <kpathsea/c-ctype.h>
/* Actually, we don't worry about a trailing exponent. */
boolean
float_ok (string str)
{
boolean found_digit = false;
if (str == NULL)
return false;
/* Allow leading `-' or `+' sign (but digits must follow). */
if (*str == '-' || *str == '+')
{
str++;
}
/* Skip decimal digits. */
while (ISDIGIT (*str))
{
str++;
found_digit = true;
}
/* If a `.' follows, can have more digits. */
if (*str == '.')
{
str++;
while (ISDIGIT (*str))
{
str++;
found_digit = true;
}
}
return *str == 0 && found_digit;
}
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