1 /* vi: set sw=4 ts=4: */
2 /*
3  * skip_whitespace implementation for busybox
4  *
5  * Copyright (C) 2003  Manuel Novoa III  <mjn3@codepoet.org>
6  *
7  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
8  */
9 #include "libbb.h"
10 
skip_whitespace(const char * s)11 char* FAST_FUNC skip_whitespace(const char *s)
12 {
13 	/* In POSIX/C locale (the only locale we care about: do we REALLY want
14 	 * to allow Unicode whitespace in, say, .conf files? nuts!)
15 	 * isspace is only these chars: "\t\n\v\f\r" and space.
16 	 * "\t\n\v\f\r" happen to have ASCII codes 9,10,11,12,13.
17 	 * Use that.
18 	 */
19 	while (*s == ' ' || (unsigned char)(*s - 9) <= (13 - 9))
20 		s++;
21 
22 	return (char *) s;
23 }
24 
skip_non_whitespace(const char * s)25 char* FAST_FUNC skip_non_whitespace(const char *s)
26 {
27 	while (*s != '\0' && *s != ' ' && (unsigned char)(*s - 9) > (13 - 9))
28 		s++;
29 
30 	return (char *) s;
31 }
32 
skip_dev_pfx(const char * tty_name)33 char* FAST_FUNC skip_dev_pfx(const char *tty_name)
34 {
35 	char *unprefixed = is_prefixed_with(tty_name, "/dev/");
36 	return unprefixed ? unprefixed : (char*)tty_name;
37 }
38