blob: 160468c84099787fe8a1f344206dc5c59e6862fb (
plain)
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
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
|
/* float-ok.c: test if a string is a valid floating-point number.
Copyright (C) 1992, 2011 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 3, 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 "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;
}
|
