[libcamera-devel] [PATCH v3 2/7] libcamera: utils: Add method to strip Unicode characters

[Niklas Söderlund]

Add method that strips non-ASCII characters from a string.

Signed-off-by: Niklas Söderlund <niklas.soderlund at ragnatech.se>
---
 include/libcamera/internal/utils.h |  2 ++
 src/libcamera/utils.cpp            | 21 +++++++++++++++++++++
 2 files changed, 23 insertions(+)

diff --git a/include/libcamera/internal/utils.h b/include/libcamera/internal/utils.h
index 45cd6f120c51586b..5bfd2a8782dbd623 100644
--- a/include/libcamera/internal/utils.h
+++ b/include/libcamera/internal/utils.h
@@ -197,6 +197,8 @@ private:
 
 details::StringSplitter split(const std::string &str, const std::string &delim);
 
+std::string stripUnicode(const std::string &str);
+
 std::string libcameraBuildPath();
 std::string libcameraSourcePath();
 
diff --git a/src/libcamera/utils.cpp b/src/libcamera/utils.cpp
index 615df46ac142a2a9..041fdc91a0a35277 100644
--- a/src/libcamera/utils.cpp
+++ b/src/libcamera/utils.cpp
@@ -342,6 +342,27 @@ details::StringSplitter split(const std::string &str, const std::string &delim)
 	return details::StringSplitter(str, delim);
 }
 
+/**
+ * \brief Strip all Unicode characters from a string
+ * \param[in] str The string to strip
+ *
+ * Strip all non-ASCII characters form a string. An Unicode character that spans
+ * multiple bytes (and therefor is not also an ASCII character) may be
+ * identified by the fact that its most significant bit is always set.
+ *
+ * \todo When switching to C++ 20 use std::remove_if.
+ *
+ * \return An ASCII string
+ */
+std::string stripUnicode(const std::string &str)
+{
+	std::string ret;
+	for (const char &c : str)
+		if (!(c & 0x80))
+			ret += c;
+	return ret;
+}
+
 /**
  * \brief Check if libcamera is installed or not
  *
-- 
2.28.0