puts

PUTS(3POSIX)                POSIX Programmer's Manual               PUTS(3POSIX)



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.1‐2008 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.1‐2008 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.1‐2008, <stdio.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
       -- Portable Operating System Interface (POSIX), The Open Group Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electrical
       and Electronics Engineers, Inc and The Open Group.  (This is POSIX.1-2008
       with the 2013 Technical Corrigendum 1 applied.) 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.unix.org/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                   2013                          PUTS(3POSIX)