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10.45.62 ungetc ¶

POSIX specification:
https://pubs.opengroup.org/onlinepubs/9799919799/functions/ungetc.html

Gnulib module: —

Portability problems fixed by Gnulib:

Portability problems not fixed by Gnulib:

• On Windows platforms (excluding Cygwin), this function does not set errno upon failure.