fgetc, fgets, getc, getchar, ungetc - input of characters and strings

       For an explanation of the terms used in this section, see attributes(7).
       ┌─────────────────────────────────────────────────────────────────────────────┬───────────────┬─────────┐
       │ Interface                                                                   │ Attribute     │ Value   │
       ├─────────────────────────────────────────────────────────────────────────────┼───────────────┼─────────┤
       │ fgetc(), fgets(), getc(), getchar(), ungetc()                               │ Thread safety │ MT-Safe │
       └─────────────────────────────────────────────────────────────────────────────┴───────────────┴─────────┘

fgetc() reads the next character from stream and returns it as an unsignedchar cast to an int, or EOF on
       end of file or error.

       getc()  is equivalent to fgetc() except that it may be implemented as a macro which evaluates stream more
       than once.

       getchar() is equivalent to getc(stdin).

       fgets() reads in at most one less than size characters from  stream  and  stores  them  into  the  buffer
       pointed  to  by s.  Reading stops after an EOF or a newline.  If a newline is read, it is stored into the
       buffer.  A terminating null byte ('\0') is stored after the last character in the buffer.

       ungetc() pushes c back to stream, cast to unsignedchar,  where  it  is  available  for  subsequent  read
       operations.  Pushed-back characters will be returned in reverse order; only one pushback is guaranteed.

       Calls  to  the  functions  described  here  can  be  mixed  with each other and with calls to other input
       functions from the stdio library for the same input stream.

       For nonlocking counterparts, see unlocked_stdio(3).

       POSIX.1-2001, C89.

       Standard C library (libc, -lc)

       fgetc, fgets, getc, getchar, ungetc - input of characters and strings

       It  is  not  advisable  to  mix  calls  to input functions from the stdio library with low-level calls to
       read(2) for the file descriptor associated with the input stream; the results will be undefined and  very
       probably not what you want.

fgetc(), getc(), and getchar() return the character read as an unsignedchar cast to an int or EOF on end
       of file or error.

       fgets() returns s on success, and NULL on error or when end of file occurs while no characters have  been
       read.

       ungetc() returns c on success, or EOF on error.

read(2),  write(2),  ferror(3),  fgetwc(3), fgetws(3), fopen(3), fread(3), fseek(3), getline(3), gets(3),
       getwchar(3), puts(3), scanf(3), ungetwc(3), unlocked_stdio(3), feature_test_macros(7)

Linux man-pages 6.9.1                              2024-06-15                                           fgetc(3)

       C11, POSIX.1-2008.

#include<stdio.h>intfgetc(FILE*stream);intgetc(FILE*stream);intgetchar(void);char*fgets(chars[restrict.size],intsize,FILE*restrictstream);intungetc(intc,FILE*stream);