busybox/libbb/skip_whitespace.c

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/* vi: set sw=4 ts=4: */
/*
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* skip_whitespace implementation for busybox
*
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* Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org>
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
#include "libbb.h"
char* FAST_FUNC skip_whitespace(const char *s)
{
/* In POSIX/C locale (the only locale we care about: do we REALLY want
* to allow Unicode whitespace in, say, .conf files? nuts!)
* isspace is only these chars: "\t\n\v\f\r" and space.
* "\t\n\v\f\r" happen to have ASCII codes 9,10,11,12,13.
* Use that.
*/
while (*s == ' ' || (unsigned char)(*s - 9) <= (13 - 9))
s++;
return (char *) s;
}
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char* FAST_FUNC skip_non_whitespace(const char *s)
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{
while (*s != '\0' && *s != ' ' && (unsigned char)(*s - 9) > (13 - 9))
s++;
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return (char *) s;
}