In this special case, I removed the portability by latest commit.
https://www.man7.org/linux/man-pages/man3/fopen.3.html
BTW:
My C is rusty, too - I learned assembler (6502, 6802, 68000/68010).
Code:
The mode string can also include the letter 'b' either as a last
character or as a character between the characters in any of the
two-character strings described above. This is strictly for
compatibility with C89 and has no effect; the 'b' is ignored on
all POSIX conforming systems, including Linux. (Other systems
may treat text files and binary files differently, and adding the
'b' may be a good idea if you do I/O to a binary file and expect
that your program may be ported to non-UNIX environments.)BTW:
My C is rusty, too - I learned assembler (6502, 6802, 68000/68010).