[FFmpeg-devel] [PATCH] Implement av_get_token()

[Michael Niedermayer]

On Fri, Apr 24, 2009 at 01:32:08AM +0200, Stefano Sabatini wrote:
> Hi, as in subject.
> Maybe it should be implemented in libavutil/avstring.h, but then maybe
> is also better to wait for it to stabilize.
> 
> This is the output of the test program:
> 
> || -> || + ||
> |:| -> || + |:|
> |    | -> || + ||
> |foo     | -> |foo| + ||
> |     foo| -> |foo| + ||
> |      foo       | -> |foo| + ||
> | foo   bar    :   blahblah| -> |foo   bar| + |:   blahblah|
> |\f\o\o| -> |foo| + ||
> |'foo : \ \  '   : blahblah| -> |foo : \ \| + |: blahblah|
> |'\fo\o:': blahblah| -> |\fo\o:| + |: blahblah|
> |\'fo\o\:':  foo'  :blahblah| -> |'foo::  foo| + |:blahblah|

add \ at the end escaing the traiing null
and unterminated '
and escaped leading and trailing whitespace
[..]
> +char *av_get_token(const char **buf, const char *term)
> +{
> +    char *out = av_malloc(strlen(*buf) + 1);
> +    char *ret = out;
> +    const char *p = *buf;
> +    p += strspn(p, WHITESPACES);
> +
> +    do {
> +        char c = *p++;
> +        switch (c) {
> +        case '\\':
> +            *out++ = *p++;
> +            break;
> +        case '\'':
> +            while(*p && *p != '\'')
> +                *out++ = *p++;
> +            if(*p)
> +                p++;
> +            break;
> +        default:
> +            if (!c || strspn((p-1), term))
> +                *out++ = 0;
> +            else
> +                *out++ = c;
> +        }
> +    } while(out[-1]);
> +
> +    p--;
> +    *buf = p;
> +

> +    /* strip trailing whitespaces */
> +    out--;
> +    while(--out >= ret && strspn(out, WHITESPACES))
> +        *out = 0;

this will remove escaped trailing whitespaces

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

it is not once nor twice but times without number that the same ideas make
their appearance in the world. -- Aristotle
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