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

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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>
This commit is contained in:
Rusty Russell 2009-03-31 13:05:36 -06:00
parent aa0d3bb77e
commit 66f92cf9d4
1 changed files with 9 additions and 0 deletions
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9
include/linux/string.h
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@ -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, extern ssize_t memory_read_from_buffer(void *to, size_t count, loff_t *ppos,
const void *from, size_t available); 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
#endif /* _LINUX_STRING_H_ */ #endif /* _LINUX_STRING_H_ */