Messages in this thread | | | Subject | Re: [PATCH RESEND 1/2] perf string: Add strcmp_prefix() | From | "liwei (GF)" <> | Date | Fri, 25 Mar 2022 10:06:47 +0800 |
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On 2022/3/23 5:22, Arnaldo Carvalho de Melo wrote: > Em Fri, Mar 18, 2022 at 05:22:44PM +0800, Wei Li escreveu: >> Add a helper to check whether a string has the given prefix. >> This function is stolen from fs/xattr.c > > Can't you use strstarts()? See tools/include/linux/string.h. >
Sorry, i haven't known that before, will use strstarts() in v2.
Thanks, Wei
> >> Signed-off-by: Wei Li <liwei391@huawei.com> >> --- >> tools/perf/util/string.c | 17 +++++++++++++++++ >> tools/perf/util/string2.h | 1 + >> 2 files changed, 18 insertions(+) >> >> diff --git a/tools/perf/util/string.c b/tools/perf/util/string.c >> index f6d90cdd9225..0ed3e2d0b70f 100644 >> --- a/tools/perf/util/string.c >> +++ b/tools/perf/util/string.c >> @@ -209,6 +209,23 @@ int strtailcmp(const char *s1, const char *s2) >> return 0; >> } >> >> +/** >> + * strcmp_prefix - check string for given prefix >> + * @str: the target string to check >> + * @prefix: the given prefix to match >> + * >> + * Return the rest string in @str if @str has the given @prefix, return NULL >> + * otherwise. >> + */ >> +const char *strcmp_prefix(const char *str, const char *prefix) >> +{ >> + while (*prefix && *str == *prefix) { >> + str++; >> + prefix++; >> + } >> + return *prefix ? NULL : str; >> +} >> + >> char *asprintf_expr_inout_ints(const char *var, bool in, size_t nints, int *ints) >> { >> /* >> diff --git a/tools/perf/util/string2.h b/tools/perf/util/string2.h >> index 56c30fef9682..58929ad928f7 100644 >> --- a/tools/perf/util/string2.h >> +++ b/tools/perf/util/string2.h >> @@ -20,6 +20,7 @@ static inline bool strisglob(const char *str) >> return strpbrk(str, "*?[") != NULL; >> } >> int strtailcmp(const char *s1, const char *s2); >> +const char *strcmp_prefix(const char *str, const char *prefix); >> >> char *asprintf_expr_inout_ints(const char *var, bool in, size_t nints, int *ints); >> >> -- >> 2.25.1 >
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