字符串分割函数strsep

最新推荐文章于 2018-02-04 14:02:06 发布

原创最新推荐文章于 2018-02-04 14:02:06 发布 · 684 阅读

0 ·

CC 4.0 BY-SA版权

文章标签：

#string #search #null #function #token

C基础知识专栏收录该内容

4 篇文章

订阅专栏

本文深入解析了C语言中用于查找字符串中字符出现位置的strpbrk函数和用于分割字符串的strsep函数，详细讲解了其用法和实现原理。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

#ifndef __HAVE_ARCH_STRPBRK
/**
 * strpbrk - Find the first occurrence of a set of characters
 * @cs: The string to be searched
 * @ct: The characters to search for
 */
char *strpbrk(const char *cs, const char *ct)
{
	const char *sc1, *sc2;

	for (sc1 = cs; *sc1 != '\0'; ++sc1) {
		for (sc2 = ct; *sc2 != '\0'; ++sc2) {
			if (*sc1 == *sc2)
				return (char *)sc1;
		}
	}
	return NULL;
}
EXPORT_SYMBOL(strpbrk);
#endif

#ifndef __HAVE_ARCH_STRSEP
/**
 * strsep - Split a string into tokens
 * @s: The string to be searched
 * @ct: The characters to search for
 *
 * strsep() updates @s to point after the token, ready for the next call.
 *
 * It returns empty tokens, too, behaving exactly like the libc function
 * of that name. In fact, it was stolen from glibc2 and de-fancy-fied.
 * Same semantics, slimmer shape. ;)
 */
char *strsep(char **s, const char *ct)
{
	char *sbegin = *s;
	char *end;

	if (sbegin == NULL)
		return NULL;

	end = strpbrk(sbegin, ct);
	if (end)
		*end++ = '\0';
	*s = end;
	return sbegin;
}
EXPORT_SYMBOL(strsep);
#endif