From 0f4bc9d67a643a6ea8b82faf724e44648b2c322d Mon Sep 17 00:00:00 2001 From: Wander Lairson Costa Date: Mon, 9 Mar 2026 16:46:23 -0300 Subject: rtla: Add str_has_prefix() helper function Add a str_has_prefix() helper function that tests whether a string starts with a given prefix. This function provides a cleaner interface for prefix matching compared to using strncmp() with strlen() directly. The function returns a boolean value indicating whether the string starts with the specified prefix. This helper will be used in subsequent changes to simplify prefix matching code throughout rtla. Also add the missing string.h include which is needed for the strlen() and strncmp() functions used by str_has_prefix() and the existing strncmp_static() macro. Signed-off-by: Wander Lairson Costa Link: https://lore.kernel.org/r/20260309195040.1019085-11-wander@redhat.com Signed-off-by: Tomas Glozar --- tools/tracing/rtla/src/utils.h | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/tools/tracing/rtla/src/utils.h b/tools/tracing/rtla/src/utils.h index b15a1a154076..e794ede64b2c 100644 --- a/tools/tracing/rtla/src/utils.h +++ b/tools/tracing/rtla/src/utils.h @@ -1,6 +1,7 @@ // SPDX-License-Identifier: GPL-2.0 #include +#include #include #include #include @@ -24,6 +25,18 @@ /* Compare string with static string, length determined at compile time */ #define strncmp_static(s1, s2) strncmp(s1, s2, ARRAY_SIZE(s2)) +/** + * str_has_prefix - Test if a string has a given prefix + * @str: The string to test + * @prefix: The string to see if @str starts with + * + * Returns: true if @str starts with @prefix, false otherwise + */ +static inline bool str_has_prefix(const char *str, const char *prefix) +{ + return strncmp(str, prefix, strlen(prefix)) == 0; +} + #define container_of(ptr, type, member)({ \ const typeof(((type *)0)->member) *__mptr = (ptr); \ (type *)((char *)__mptr - offsetof(type, member)) ; }) -- cgit v1.2.3