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10.381 ftello

POSIX specification:
https://pubs.opengroup.org/onlinepubs/9699919799/functions/ftello.html

Gnulib module: ftello

Portability problems fixed by Gnulib:

• This function is missing on some platforms: mingw, MSVC 14.
• The declaration of ftello in <stdio.h> is not enabled by default on some platforms: glibc 2.3.6.
• This function produces incorrect results after putc that followed a getc call that reached EOF on some platforms: Solaris 11 2010-11.
• This function, when invoked after ungetc, throws away the ungetc buffer, changes the stream’s file position, and returns the wrong position on some platforms: macOS 10.15, 11, 12.
• This function fails on seekable stdin, stdout, and stderr: cygwin <= 1.5.24.
• This function mistakenly succeeds on pipes on some platforms: mingw 10.
• On platforms where off_t is a 32-bit type, ftello does not work correctly with files 2 GiB and larger. See Large File Support.

Portability problems not fixed by Gnulib:

• This function produces incorrect results immediately after fseek on some platforms: HP-UX 11.
• fflush, ftell, ftello, fgetpos behave incorrectly on input streams that are opened in O_TEXT mode and whose contents contains Unix line terminators (LF), on some platforms: mingw, MSVC 14.