14 lines
641 B
Diff
14 lines
641 B
Diff
diff --git a/c/driver_manager/adbc_driver_manager.cc b/c/driver_manager/adbc_driver_manager.cc
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index 0ce173a..2a7fef8 100644
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--- a/c/driver_manager/adbc_driver_manager.cc
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+++ b/c/driver_manager/adbc_driver_manager.cc
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@@ -675,7 +675,7 @@ std::string AdbcDriverManagerDefaultEntrypoint(const std::string& driver) {
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// if pos == npos this is the entire filename
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std::string token = filename.substr(prev, pos - prev);
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// capitalize first letter
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- token[0] = std::toupper(static_cast<unsigned char>(token[0]));
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+ token[0] = static_cast<char>(std::toupper(static_cast<unsigned char>(token[0])));
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entrypoint += token;
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