1FGETC(3)                   Linux Programmer's Manual                  FGETC(3)
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NAME

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

9       #include <stdio.h>
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11       int fgetc(FILE *stream);
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13       char *fgets(char *s, int size, FILE *stream);
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15       int getc(FILE *stream);
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17       int getchar(void);
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19       int ungetc(int c, FILE *stream);
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DESCRIPTION

22       fgetc()  reads  the  next  character  from  stream and returns it as an
23       unsigned char cast to an int, or EOF on end of file or error.
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25       getc() is equivalent to fgetc() except that it may be implemented as  a
26       macro which evaluates stream more than once.
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28       getchar() is equivalent to getc(stdin).
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30       fgets()  reads in at most one less than size characters from stream and
31       stores them into the buffer pointed to by s.  Reading  stops  after  an
32       EOF  or a newline.  If a newline is read, it is stored into the buffer.
33       A terminating null byte ('\0') is stored after the  last  character  in
34       the buffer.
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36       ungetc()  pushes  c  back to stream, cast to unsigned char, where it is
37       available for subsequent read operations.  Pushed-back characters  will
38       be returned in reverse order; only one pushback is guaranteed.
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40       Calls  to the functions described here can be mixed with each other and
41       with calls to other input functions from the stdio library for the same
42       input stream.
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44       For nonlocking counterparts, see unlocked_stdio(3).
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RETURN VALUE

47       fgetc(),  getc() and getchar() return the character read as an unsigned
48       char cast to an int or EOF on end of file or error.
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50       fgets() returns s on success, and NULL on error or  when  end  of  file
51       occurs while no characters have been read.
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53       ungetc() returns c on success, or EOF on error.
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ATTRIBUTES

56       For   an   explanation   of   the  terms  used  in  this  section,  see
57       attributes(7).
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59       ┌──────────────────────────┬───────────────┬─────────┐
60       │Interface                 │ Attribute     │ Value   │
61       ├──────────────────────────┼───────────────┼─────────┤
62       │fgetc(), fgets(), getc(), │ Thread safety │ MT-Safe │
63       │getchar(), ungetc()       │               │         │
64       └──────────────────────────┴───────────────┴─────────┘
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CONFORMING TO

67       POSIX.1-2001, POSIX.1-2008, C89, C99.
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69       It is not advisable to mix calls to  input  functions  from  the  stdio
70       library with low-level calls to read(2) for the file descriptor associ‐
71       ated with the input stream; the results  will  be  undefined  and  very
72       probably not what you want.
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SEE ALSO

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

80       This  page  is  part of release 4.16 of the Linux man-pages project.  A
81       description of the project, information about reporting bugs,  and  the
82       latest     version     of     this    page,    can    be    found    at
83       https://www.kernel.org/doc/man-pages/.
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87GNU                               2017-09-15                          FGETC(3)
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