36 lines
996 B
C++
36 lines
996 B
C++
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#include <cstdarg>
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#include <cstdio>
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#include <cstdint>
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using LibRetroLogLevel = std::uint32_t;
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extern "C" {
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/// This function is defined in Rust and recieves our formatted log messages.
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void libretro_log_recieve(LibRetroLogLevel level, const char* buf);
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/// This helper function is given to Rust code to implement the libretro logging
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/// (because it's a C-varadic function; that requires nightly/unstable Rust)
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///
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/// By implementing it in C++, we can dodge all that and keep using stable rustc.
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void libretro_log(LibRetroLogLevel level, const char* format, ...) {
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char buf[512]{};
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va_list val;
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va_start(val, format);
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auto n = std::vsnprintf(&buf[0], sizeof(buf)-1, format, val);
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va_end(val);
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// Failed to format for some reason, just give up.
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if(n == -1)
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return;
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// Remove the last newline and replace it with a null terminator.
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if(buf[n-1] == '\n')
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buf[n-1] = '\0';
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// Call the Rust-side reciever.
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return libretro_log_recieve(level, &buf[0]);
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}
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}
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