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Tests: limit the multi-character ungetc() test to glibc and Apple

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The Windows C runtime only supports one pushed-back character, which
broke the Windows CI jobs.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01N5NasEsrzHhSNouxSoEwqz
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Claude committed 2026-11-06 22:35:01 +00:00
1 parent 704a324639
commit 6a6744004c
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tests/src/unit-file_input.cpp
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@@ -303,10 +303,12 @@ TEST_CASE("parsing from a FILE*")
} }
#endif #endif
#if !defined(JSON_NOEXCEPTION) // the C standard guarantees only one pushed-back character (and the
// Windows C runtime fails further calls to ungetc()), so this is limited
// to the C libraries that keep them in a separate buffer
#if !defined(JSON_NOEXCEPTION) && ((defined(__GLIBC__) && !defined(__UCLIBC__)) || defined(__APPLE__))
SECTION("characters pushed back with ungetc() before parsing") SECTION("characters pushed back with ungetc() before parsing")
{ {
// (glibc and Apple keep them in a separate buffer)
const file_ptr f = open_with(name, "2, 3]"); const file_ptr f = open_with(name, "2, 3]");
REQUIRE(f != nullptr); REQUIRE(f != nullptr);
REQUIRE(std::ungetc(',', f.get()) == ','); REQUIRE(std::ungetc(',', f.get()) == ',');