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);
12       int getc(FILE *stream);
13       int getchar(void);
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15       char *fgets(char *restrict s, int size, FILE *restrict stream);
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17       int ungetc(int c, FILE *stream);
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DESCRIPTION

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

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

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

65       POSIX.1-2001, POSIX.1-2008, C89, C99.
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67       It  is not advisable to mix calls to input functions from the stdio li‐
68       brary with low-level calls to read(2) for the file descriptor associat‐
69       ed with the input stream; the results will be undefined and very proba‐
70       bly not what you want.
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SEE ALSO

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

78       This page is part of release 5.12 of the Linux  man-pages  project.   A
79       description  of  the project, information about reporting bugs, and the
80       latest    version    of    this    page,    can     be     found     at
81       https://www.kernel.org/doc/man-pages/.
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85GNU                               2021-03-22                          FGETC(3)
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