[PATCH v3 10/18] rtla: Add str_has_prefix() helper function
From: Wander Lairson Costa <hidden>
Date: 2026-01-15 17:27:47
Also in:
bpf, lkml
Subsystem:
real-time linux analysis (rtla) tools, the rest · Maintainers:
Steven Rostedt, Tomas Glozar, Linus Torvalds
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 <redacted> --- 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 25b08fc5e199a..1235d0f3a7bfd 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 <stdint.h> +#include <string.h> #include <time.h> #include <sched.h> #include <stdbool.h>
@@ -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)) ; })
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2.52.0