[libc-commits] [libc] [libc] Add printf error handling (PR #162876)

[Michael Jones via libc-commits]

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@@ -22,6 +22,18 @@
 namespace LIBC_NAMESPACE_DECL {
 namespace printf_core {
 
+struct PrintfResult {
+  size_t value;
+  int error;
+
+  constexpr PrintfResult(size_t val) : value(val), error(0) {}
+  constexpr PrintfResult(size_t val, int error) : value(val), error(error) {}
+
+  constexpr bool has_error() { return error != 0; }
+
+  constexpr operator size_t() { return value; }
+};
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michaelrj-google wrote:

I'm not sure this struct is necessary since I don't think there are any cases where we want to both set errno and return the value, it's always one or the other. I'd recommend using the `ErrorOr` struct instead.

https://github.com/llvm/llvm-project/pull/162876