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-rw-r--r--lib/libc/stdio/ungetc.35
1 files changed, 5 insertions, 0 deletions
diff --git a/lib/libc/stdio/ungetc.3 b/lib/libc/stdio/ungetc.3
index 83483be..054213c 100644
--- a/lib/libc/stdio/ungetc.3
+++ b/lib/libc/stdio/ungetc.3
@@ -73,6 +73,11 @@ an effectively infinite amount of pushback is allowed.
.Pp
If a character is successfully pushed-back,
the end-of-file indicator for the stream is cleared.
+The file-position indicator is decremented
+by each successful call to
+.Fn ungetc ;
+if its value was 0 before a call, its value is unspecified after
+the call.
.Sh RETURN VALUES
The
.Fn ungetc
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