Commit 66f92cf9 authored Mar 31, 2009 by Rusty Russell

strstarts: helper function for !strncmp(str, prefix, strlen(prefix))



Impact: minor new API

ksplice added a "starts_with" function, which seems like a common need.
When people open-code it they seem to use fixed numbers rather than strlen,
so it's quite a readability win (also, strncmp() almost always wants != 0
on it).

So here's strstarts().

Cc: Anders Kaseorg <andersk@mit.edu>
Cc: Jeff Arnold <jbarnold@mit.edu>
Cc: Tim Abbott <tabbott@mit.edu>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

parent aa0d3bb7

include/linux/string.h

+9 −0

Original line number	Diff line number	Diff line
		@@ -114,5 +114,14 @@ extern bool sysfs_streq(const char s1, const char s2);
		extern ssize_t memory_read_from_buffer(void to, size_t count, loff_t ppos,
		const void *from, size_t available);

		/**
		* strstarts - does @str start with @prefix?
		* @str: string to examine
		* @prefix: prefix to look for.
		*/
		static inline bool strstarts(const char str, const char prefix)
		{
		return strncmp(str, prefix, strlen(prefix)) == 0;
		}
		#endif
		#endif /* _LINUX_STRING_H_ */

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