* [PATCH 4/9] strstarts: helper function for !strncmp(str, prefix, strlen(prefix))
@ 2009-02-07 12:45 Rusty Russell
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From: Rusty Russell @ 2009-02-07 12:45 UTC (permalink / raw)
To: linux-kernel; +Cc: Anders Kaseorg, Jeff Arnold, Tim Abbott
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>
---
include/linux/string.h | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/include/linux/string.h b/include/linux/string.h
--- a/include/linux/string.h
+++ b/include/linux/string.h
@@ -114,5 +114,14 @@ extern ssize_t memory_read_from_buffer(v
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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