putc(3) - f39

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

6       fputc, fputs, putc, putchar, puts - output 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 fputc(int c, FILE *stream);
15       int putc(int c, FILE *stream);
16       int putchar(int c);
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18       int fputs(const char *restrict s, FILE *restrict stream);
19       int puts(const char *s);
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DESCRIPTION

22       fputc() writes the character c, cast to an unsigned char, to stream.
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24       putc()  is equivalent to fputc() except that it may be implemented as a
25       macro which evaluates stream more than once.
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27       putchar(c) is equivalent to putc(c, stdout).
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29       fputs() writes the string s to stream,  without  its  terminating  null
30       byte ('\0').
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32       puts() writes the string s and a trailing newline to stdout.
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34       Calls  to the functions described here can be mixed with each other and
35       with calls to other output functions from the  stdio  library  for  the
36       same output stream.
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38       For nonlocking counterparts, see unlocked_stdio(3).
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RETURN VALUE

41       fputc(),  putc(),  and putchar() return the character written as an un‐
42       signed char cast to an int or EOF on error.
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44       puts() and fputs() return a nonnegative number on success,  or  EOF  on
45       error.
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ATTRIBUTES

48       For  an  explanation  of  the  terms  used  in  this  section,  see at‐
49       tributes(7).
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51       ┌────────────────────────────────────────────┬───────────────┬─────────┐
52       │Interface                                   │ Attribute     │ Value   │
53       ├────────────────────────────────────────────┼───────────────┼─────────┤
54       │fputc(), fputs(), putc(), putchar(), puts() │ Thread safety │ MT-Safe │
55       └────────────────────────────────────────────┴───────────────┴─────────┘
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STANDARDS

58       C11, POSIX.1-2008.
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HISTORY

61       POSIX.1-2001, C89, C99.
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BUGS

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