man3/puts.3

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  25 .\" Modified Sat Jul 24 18:42:59 1993 by Rik Faith (faith@cs.unc.edu)
  26 .TH PUTS 3  2018-04-30 "GNU" "Linux Programmer's Manual"
  27 .SH NAME
  28 fputc, fputs, putc, putchar, puts \- output of characters and strings
  29 .SH SYNOPSIS
  30 .nf
  31 .B #include <stdio.h>
  32 .PP
  33 .BI "int fputc(int " c ", FILE *" stream );
  34 .PP
  35 .BI "int fputs(const char *" "s" ", FILE *" "stream" );
  36 .PP
  37 .BI "int putc(int " c ", FILE *" stream );
  38 .PP
  39 .BI "int putchar(int " c );
  40 .PP
  41 .BI "int puts(const char *" "s" );
  42 .fi
  43 .SH DESCRIPTION
  44 .BR fputc ()
  45 writes the character
  46 .IR c ,
  47 cast to an
  48 .IR "unsigned char" ,
  49 to
  50 .IR stream .
  51 .PP
  52 .BR fputs ()
  53 writes the string
  54 .I s
  55 to
  56 .IR stream ,
  57 without its terminating null byte (\(aq\e0\(aq).
  58 .PP
  59 .BR putc ()
  60 is equivalent to
  61 .BR fputc ()
  62 except that it may be implemented as a macro which evaluates
  63 .I stream
  64 more than once.
  65 .PP
  66 .BI "putchar(" c )
  67 is equivalent to
  68 .BI "putc(" c ", " stdout ) \fR.
  69 .PP
  70 .BR puts ()
  71 writes the string
  72 .I s
  73 and a trailing newline
  74 to
  75 .IR stdout .
  76 .PP
  77 Calls to the functions described here can be mixed with each other and with
  78 calls to other output functions from the
  79 .I stdio
  80 library for the same output stream.
  81 .PP
  82 For nonlocking counterparts, see
  83 .BR unlocked_stdio (3).
  84 .SH RETURN VALUE
  85 .BR fputc (),
  86 .BR putc ()
  87 and
  88 .BR putchar ()
  89 return the character written as an
  90 .I unsigned char
  91 cast to an
  92 .I int
  93 or
  94 .B EOF
  95 on error.
  96 .PP
  97 .BR puts ()
  98 and
  99 .BR fputs ()
 100 return a nonnegative number on success, or
 101 .B EOF
 102 on error.
 103 .SH ATTRIBUTES
 104 For an explanation of the terms used in this section, see
 105 .BR attributes (7).
 106 .TS
 107 allbox;
 108 lbw25 lb lb
 109 l l l.
 110 Interface       Attribute       Value
 111 T{
 112 .BR fputc (),
 113 .BR fputs (),
 114 .BR putc (),
 115 .BR putchar (),
 116 .BR puts ()
 117 T}      Thread safety   MT-Safe
 118 .TE
 119 .SH CONFORMING TO
 120 POSIX.1-2001, POSIX.1-2008, C89, C99.
 121 .SH BUGS
 122 It is not advisable to mix calls to output functions from the
 123 .I stdio
 124 library with low-level calls to
 125 .BR write (2)
 126 for the file descriptor associated with the same output stream; the results
 127 will be undefined and very probably not what you want.
 128 .SH SEE ALSO
 129 .BR write (2),
 130 .BR ferror (3),
 131 .BR fgets (3),
 132 .BR fopen (3),
 133 .BR fputwc (3),
 134 .BR fputws (3),
 135 .BR fseek (3),
 136 .BR fwrite (3),
 137 .BR putwchar (3),
 138 .BR scanf (3),
 139 .BR unlocked_stdio (3)