1fgetc(3)                   Library Functions Manual                   fgetc(3)
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NAME

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

9       Standard C library (libc, -lc)
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SYNOPSIS

12       #include <stdio.h>
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14       int fgetc(FILE *stream);
15       int getc(FILE *stream);
16       int getchar(void);
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18       char *fgets(char s[restrict .size], int size, FILE *restrict stream);
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20       int ungetc(int c, FILE *stream);
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DESCRIPTION

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

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

57       For  an  explanation  of  the  terms  used  in  this  section,  see at‐
58       tributes(7).
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60       ┌────────────────────────────────────────────┬───────────────┬─────────┐
61Interface                                   Attribute     Value   
62       ├────────────────────────────────────────────┼───────────────┼─────────┤
63fgetc(), fgets(), getc(), getchar(),        │ Thread safety │ MT-Safe │
64ungetc()                                    │               │         │
65       └────────────────────────────────────────────┴───────────────┴─────────┘
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STANDARDS

68       C11, POSIX.1-2008.
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HISTORY

71       POSIX.1-2001, C89.
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NOTES

74       It  is not advisable to mix calls to input functions from the stdio li‐
75       brary with low-level calls to read(2) for the file descriptor associat‐
76       ed with the input stream; the results will be undefined and very proba‐
77       bly not what you want.
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SEE ALSO

80       read(2), write(2), ferror(3), fgetwc(3), fgetws(3), fopen(3), fread(3),
81       fseek(3),   getline(3),   gets(3),   getwchar(3),   puts(3),  scanf(3),
82       ungetwc(3), unlocked_stdio(3), feature_test_macros(7)
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86Linux man-pages 6.04              2023-03-30                          fgetc(3)
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