RE: [PHP] converting C to PHP
| From: | Martin Towell | Date: | Thu, 13 Jun 2002 04:13:48 +0000 |
| Subject: | RE: [PHP] converting C to PHP | ||
| Groups: | php.general | ||
| Request: | Send a blank email to php-general+get-101890@lists.php.net to get a copy of this message | ||
But what about the pointer &cp2
If endptr is not NULL, strtol() stores the address of the first
invalid character in *endptr. If there were no digits at all,
strtol() stores the original value of nptr in *endptr. (Thus,
if *nptr is not
\0' but **endptr is \0' on return, the entire
string is valid.)
Instead of a pointer - a position number would be okay....
(Actually, to get the number, I could just do "$cp-0" or "$cp*1" - gotta
love variants)
-----Original Message-----
From: Daniel Tryba [mailto:php-general@canopus.nl]
Sent: Thursday, June 13, 2002 2:12 PM
To: Martin Towell
Cc: php-general@lists.php.net
Subject: Re: [PHP] converting C to PHP
On Thu, Jun 13, 2002 at 01:12:18PM +1000, Martin Towell wrote:
> I'm converting some C functions to PHP and have come across this:
>
> int skipf(..., char *format)
> {
> /* ... */
> cp = format;
> char *cp, *cp2;
> multiplier = strtol(cp, &cp2, 10);
> /* ... */
> }
>
>
> How can I implement this line in PHP ?
> multiplier = strtol(cp, &cp2, 10);
>
>
> Oh, and an example of format is "12L20W2P"
And the outcome in this case would be 12?
From man strtol:
<quote>
The string must begin with an arbitrary amount of white
space (as determined by isspace(3)) followed by a single
optional +' or -' sign. If base is zero or 16, the
string may then include a `0x' prefix, and the number will
be read in base 16; otherwise, a zero base is taken as 10
(decimal) unless the next character is `0', in which case
it is taken as 8 (octal).
The remainder of the string is converted to a long int
value in the obvious manner, stopping at the first charac
ter which is not a valid digit in the given base. (In
bases above 10, the letter `A' in either upper or lower
case represents 10, `B' represents 11, and so forth, with
`Z' representing 35.)
</quote>
Sounds like a regexp would work, with base 10 this would make:
function skipf($str)
{
if(preg_match("/^\s*(\+|-)?(\d+)/",$str,$match))
{
return intval($match[1].$match[2],10);
}
else
{
return false;
}
}
$format="012L20W2P";
$int=skipf($format);
$int is 12 in this example.
--
Daniel Tryba