Add a new sysfs_streq() string comparison function (34990cf7) · Commits · 戴 / test

include/linux/string.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -109,5 +109,7 @@ extern void kmemdup(const void src, size_t len, gfp_t gfp);
		extern char *argv_split(gfp_t gfp, const char str, int *argcp);
		extern void argv_free(char **argv);

		extern bool sysfs_streq(const char s1, const char s2);

		#endif
		#endif /* _LINUX_STRING_H_ */

+27 −0

Original line number	Diff line number	Diff line
		@@ -493,6 +493,33 @@ char strsep(char s, const char ct)
		EXPORT_SYMBOL(strsep);
		#endif

		/**
		* sysfs_streq - return true if strings are equal, modulo trailing newline
		* @s1: one string
		* @s2: another string
		*
		* This routine returns true iff two strings are equal, treating both
		* NUL and newline-then-NUL as equivalent string terminations. It's
		* geared for use with sysfs input strings, which generally terminate
		* with newlines but are compared against values without newlines.
		*/
		bool sysfs_streq(const char s1, const char s2)
		{
		while (s1 && s1 == *s2) {
		s1++;
		s2++;
		}

		if (s1 == s2)
		return true;
		if (!s1 && s2 == '\n' && !s2[1])
		return true;
		if (s1 == '\n' && !s1[1] && !s2)
		return true;
		return false;
		}
		EXPORT_SYMBOL(sysfs_streq);

		#ifndef __HAVE_ARCH_MEMSET
		/**
		* memset - Fill a region of memory with the given value