From: Ye Bin <yebin10@huawei.com>
To: <rostedt@goodmis.org>, <mhiramat@kernel.org>,
<mathieu.desnoyers@efficios.com>,
<linux-trace-kernel@vger.kernel.org>
Cc: <linux-kernel@vger.kernel.org>, <yebin10@huawei.com>
Subject: [PATCH v4 1/7] string.h: add str_has_suffix() helper for test string ends with specify string
Date: Tue, 23 Jan 2024 17:21:33 +0800 [thread overview]
Message-ID: <20240123092139.3698375-2-yebin10@huawei.com> (raw)
In-Reply-To: <20240123092139.3698375-1-yebin10@huawei.com>
str_has_suffix() is test string if ends with specify string, and also
this API may return the index of where the suffix was found.
Signed-off-by: Ye Bin <yebin10@huawei.com>
---
include/linux/string.h | 28 ++++++++++++++++++++++++++++
1 file changed, 28 insertions(+)
diff --git a/include/linux/string.h b/include/linux/string.h
index 433c207a01da..2fb0f22237fe 100644
--- a/include/linux/string.h
+++ b/include/linux/string.h
@@ -405,4 +405,32 @@ static __always_inline size_t str_has_prefix(const char *str, const char *prefix
return strncmp(str, prefix, len) == 0 ? len : 0;
}
+/**
+ * str_has_suffix - Test if a string has a given suffix
+ * @str: The string to test
+ * @suffix: The string to see if @str ends with
+ * @index: The index into @str of where @suffix is if found (NULL to ignore)
+ *
+ * Returns:
+ * * strlen(@suffix) if @str ends with @suffix
+ * * 0 if @str does not end with @suffix
+ */
+static __always_inline size_t str_has_suffix(const char *str, const char *suffix,
+ size_t *index)
+{
+ size_t len = strlen(suffix);
+ size_t str_len = strlen(str);
+
+ if (len > str_len)
+ return 0;
+
+ if (strncmp(str + str_len - len, suffix, len))
+ return 0;
+
+ if (index)
+ *index = str_len - len;
+
+ return len;
+}
+
#endif /* _LINUX_STRING_H_ */
--
2.31.1
next prev parent reply other threads:[~2024-01-23 9:19 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-01-23 9:21 [PATCH v4 0/7] support '%pd' and '%pD' for print file name Ye Bin
2024-01-23 9:21 ` Ye Bin [this message]
2024-01-23 9:21 ` [PATCH v4 2/7] tracing/probes: add traceprobe_expand_dentry_args() helper Ye Bin
2024-01-23 14:26 ` Masami Hiramatsu
2024-01-23 9:21 ` [PATCH v4 3/7] tracing/probes: support '%pd' type for print struct dentry's name Ye Bin
2024-01-23 14:40 ` Masami Hiramatsu
2024-01-24 2:46 ` yebin (H)
2024-01-24 12:27 ` Masami Hiramatsu
2024-01-23 9:21 ` [PATCH v4 4/7] tracing/probes: support '%pD' type for print struct file's name Ye Bin
2024-01-23 9:21 ` [PATCH v4 5/7] tracing: add new type "%pd/%pD" in readme_msg[] Ye Bin
2024-01-23 9:21 ` [PATCH v4 6/7] Documentation: tracing: add new type '%pd' and '%pD' for kprobe Ye Bin
2024-01-23 13:07 ` Masami Hiramatsu
2024-01-23 9:21 ` [PATCH v4 7/7] selftests/ftrace: add test cases for VFS type "%pd" and "%pD" Ye Bin
2024-01-24 1:32 ` Masami Hiramatsu
2024-01-24 1:53 ` yebin (H)
2024-01-24 3:21 ` yebin (H)
2024-01-24 23:30 ` Masami Hiramatsu
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