1/*
2 *  linux/lib/string.c
3 *
4 *  Copyright (C) 1991, 1992  Linus Torvalds
5 */
6
7#ifdef USE_HOSTCC
8#include <stdio.h>
9#endif
10
11#include <linux/ctype.h>
12#include <linux/string.h>
13
14/**
15 * skip_spaces - Removes leading whitespace from @str.
16 * @str: The string to be stripped.
17 *
18 * Returns a pointer to the first non-whitespace character in @str.
19 */
20char *skip_spaces(const char *str)
21{
22	while (isspace(*str))
23		++str;
24	return (char *)str;
25}
26
27/**
28 * strim - Removes leading and trailing whitespace from @s.
29 * @s: The string to be stripped.
30 *
31 * Note that the first trailing whitespace is replaced with a %NUL-terminator
32 * in the given string @s. Returns a pointer to the first non-whitespace
33 * character in @s.
34 */
35char *strim(char *s)
36{
37	size_t size;
38	char *end;
39
40	s = skip_spaces(s);
41	size = strlen(s);
42	if (!size)
43		return s;
44
45	end = s + size - 1;
46	while (end >= s && isspace(*end))
47		end--;
48	*(end + 1) = '\0';
49
50	return s;
51}
52