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FGETC(3) Linux Programmer's Manual FGETC(3)


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


     #include <stdio.h>
     int fgetc(FILE *stream);
     char *fgets(char *s, int size, FILE *stream);
     int getc(FILE *stream);
     int getchar(void);
     int ungetc(int c, FILE *stream);


     fgetc()  reads  the  next  character  from  stream and returns it as an
     unsigned char 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 unsigned char, 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).


     fgetc(),  getc() and getchar() return the character read as an unsigned
     char 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.


     For   an   explanation   of   the  terms  used  in  this  section,  see
     allbox; lbw25 lb lb  l  l  l.   Interface Attribute Value  T{  fgetc(),
     fgets(), getc(),
     getchar(), ungetc() T}   Thread safety  MT-Safe


     POSIX.1-2001, POSIX.1-2008, C89, C99.
     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 associ-
     ated  with  the  input  stream;  the results will be undefined and very
     probably not what you want.


     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)


     This page is part of release 4.16 of the Linux  man-pages  project.   A
     description  of  the project, information about reporting bugs, and the
     latest    version    of    this    page,    can     be     found     at

GNU 2017-09-15 FGETC(3)

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