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ungetc same char #1

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ungetc same char #1

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8 changes: 6 additions & 2 deletions libstdduck/fileops.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -275,8 +275,12 @@ extern "C" int _stdduck_peek() {
return stdin_pos == stdin_end ? EOF : *stdin_pos;
}

// TODO: Support ungetc
// TODO: Fully support ungetc
int ungetc(int c, FILE *f) {
return EOF;
if (f==stdin && stdin_pos != stdin_start && stdin_pos[-1] == c) {
stdin_pos--; return c;
} else {
return EOF;
}
}