From 66f92cf9d415e96a5bdd6c64de8dd8418595d2fc Mon Sep 17 00:00:00 2001 From: Rusty Russell Date: Tue, 31 Mar 2009 13:05:36 -0600 Subject: 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 Cc: Jeff Arnold Cc: Tim Abbott Signed-off-by: Rusty Russell --- include/linux/string.h | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/include/linux/string.h b/include/linux/string.h index d18fc198aa2f..76ec218bb30f 100644 --- a/include/linux/string.h +++ b/include/linux/string.h @@ -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_ */ -- cgit v1.2.3