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FPUTS(3P)		   POSIX Programmer's Manual		     FPUTS(3P)

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
       fputs — put a string on a stream

SYNOPSIS
       #include <stdio.h>

       int fputs(const char *restrict s, FILE *restrict stream);

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  fputs() function shall write the null-terminated string pointed to
       by s to the stream pointed to by stream.	  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
       fputs()	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, fputs() shall return a non-negative number.
       Otherwise,  it shall return EOF, set an error indicator for the stream,
       and set errno 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
       fputs().	 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 ");
	   fputs(asctime(localtime(&now)), stdout);
	   printf("There are still %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
       The fputs() function is one whose source code was specified in the ref‐
       erenced	The C Programming Language. In the original edition, the func‐
       tion had no defined return value, yet  many  practical  implementations
       would, as a side-effect, return the value of the last character written
       as that was the value remaining in the accumulator  used	 as  a	return
       value.  In  the second edition of the book, either the fixed value 0 or
       EOF would be returned depending upon the return value of ferror(); how‐
       ever,  for compatibility with extant implementations, several implemen‐
       tations would, upon success, return a positive value  representing  the
       last byte written.

FUTURE DIRECTIONS
       None.

SEE ALSO
       Section 2.5, Standard I/O Streams, fopen(), putc(), puts()

       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 Electri‐
       cal  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.ker‐
       nel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group		     2013			     FPUTS(3P)
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