PROLOG

       This  manual  page  is part of the POSIX Programmer's Manual.  The Linux implementation of this interface
       may differ (consult the corresponding Linux manual page for details of Linux behavior), or the  interface
       may not be implemented on Linux.

NAME

       puts — put a string on standard output

SYNOPSIS

       #include <stdio.h>

       int puts(const char *s);

DESCRIPTION

       The  functionality  described  on  this  reference  page is aligned with the ISO C standard. Any conflict
       between the requirements described  here  and  the  ISO C  standard  is  unintentional.  This  volume  of
       POSIX.1‐2017 defers to the ISO C standard.

       The  puts()  function  shall  write  the string pointed to by s, followed by a <newline>, to the standard
       output stream stdout.  The terminating null byte shall not be written.

       The last data modification and last file status change timestamps of the file shall be marked for  update
       between  the  successful  execution of puts() and the next successful completion of a call to fflush() or
       fclose() on the same stream or a call to exit() or abort().

RETURN VALUE

       Upon successful completion, puts() shall return a non-negative number. Otherwise, it  shall  return  EOF,
       shall set an error indicator for the stream, and errno shall be set to indicate the error.

ERRORS

       Refer to fputc().

       The following sections are informative.

EXAMPLES

   Printing to Standard Output
       The following example gets the current time, converts it to a string using localtime() and asctime(), and
       prints it to standard output using puts().  It then prints the number of minutes to an event for which it
       is waiting.

           #include <time.h>
           #include <stdio.h>
           ...
           time_t now;
           int minutes_to_event;
           ...
           time(&now);
           printf("The time is ");
           puts(asctime(localtime(&now)));
           printf("There are %d minutes to the event.\n",
               minutes_to_event);
           ...

APPLICATION USAGE

       The puts() function appends a <newline>, while fputs() does not.

       This  volume  of  POSIX.1‐2017  requires that successful completion simply return a non-negative integer.
       There are at least three known different implementation conventions for this requirement:

        *  Return a constant value.

        *  Return the last character written.

        *  Return the number of bytes written. Note that this implementation convention cannot be adhered to for
           strings longer than {INT_MAX} bytes as the value would not be representable in the return type of the
           function. For backwards compatibility, implementations can return the number of bytes for strings  of
           up to {INT_MAX} bytes, and return {INT_MAX} for all longer strings.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       Section 2.5, Standard I/O Streams, fopen(), fputs(), putc()

       The Base Definitions volume of POSIX.1‐2017, <stdio.h>

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1-2017, Standard
       for  Information  Technology  --  Portable  Operating  System  Interface  (POSIX),  The  Open  Group Base
       Specifications Issue 7, 2018 Edition, Copyright (C) 2018 by the Institute of Electrical  and  Electronics
       Engineers, Inc and The Open Group.  In the event of any discrepancy between this version and the original
       IEEE  and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document.
       The original Standard can be obtained online at http://www.opengroup.org/unix/online.html .

       Any typographical or formatting errors that appear in this page are most likely to have  been  introduced
       during   the   conversion  of  the  source  files  to  man  page  format.  To  report  such  errors,  see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group                                   2017                                          PUTS(3POSIX)