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



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


NNAAMMEE
       fputs -- put a string on a stream

SSYYNNOOPPSSIISS
       #include <stdio.h>

       int fputs(const char *restrict _s, FILE *restrict _s_t_r_e_a_m);

DDEESSCCRRIIPPTTIIOONN
       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 _f_p_u_t_s() function shall write the null-terminated string pointed to
       by _s to the stream pointed to by _s_t_r_e_a_m.  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
       _f_p_u_t_s() and the next successful completion of a call to _f_f_l_u_s_h() or
       _f_c_l_o_s_e() on the same stream or a call to _e_x_i_t() or _a_b_o_r_t().

RREETTUURRNN VVAALLUUEE
       Upon successful completion, _f_p_u_t_s() shall return a non-negative number.
       Otherwise, it shall return EOF, set an error indicator for the stream,
       and set _e_r_r_n_o to indicate the error.

EERRRROORRSS
       Refer to _f_p_u_t_c().

       _T_h_e _f_o_l_l_o_w_i_n_g _s_e_c_t_i_o_n_s _a_r_e _i_n_f_o_r_m_a_t_i_v_e_.

EEXXAAMMPPLLEESS
   PPrriinnttiinngg ttoo SSttaannddaarrdd OOuuttppuutt
       The following example gets the current time, converts it to a string
       using _l_o_c_a_l_t_i_m_e() and _a_s_c_t_i_m_e(), and prints it to standard output using
       _f_p_u_t_s().  It then prints the number of minutes to an event for which it
       is waiting.

           ##iinncclluuddee <<ttiimmee..hh>>
           ##iinncclluuddee <<ssttddiioo..hh>>
           ......
           ttiimmee__tt nnooww;;
           iinntt mmiinnuutteess__ttoo__eevveenntt;;
           ......
           ttiimmee((&&nnooww));;
           pprriinnttff((""TThhee ttiimmee iiss ""));;
           ffppuuttss((aassccttiimmee((llooccaallttiimmee((&&nnooww)))),, ssttddoouutt));;
           pprriinnttff((""TThheerree aarree ssttiillll %%dd mmiinnuutteess ttoo tthhee eevveenntt..\\nn"",,
               mmiinnuutteess__ttoo__eevveenntt));;
           ......

AAPPPPLLIICCAATTIIOONN UUSSAAGGEE
       The _p_u_t_s() function appends a <newline> while _f_p_u_t_s() 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.

RRAATTIIOONNAALLEE
       The _f_p_u_t_s() function is one whose source code was specified in the
       referenced _T_h_e _C _P_r_o_g_r_a_m_m_i_n_g _L_a_n_g_u_a_g_e. In the original edition, the
       function 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 _f_e_r_r_o_r(); however, for compatibility with extant implementations,
       several implementations would, upon success, return a positive value
       representing the last byte written.

FFUUTTUURREE DDIIRREECCTTIIOONNSS
       None.

SSEEEE AALLSSOO
       _S_e_c_t_i_o_n _2_._5, _S_t_a_n_d_a_r_d _I_/_O _S_t_r_e_a_m_s, _f_o_p_e_n(), _p_u_t_c(), _p_u_t_s()

       The Base Definitions volume of POSIX.1-2008, <<ssttddiioo..hh>>

CCOOPPYYRRIIGGHHTT
       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                             FPUTS(3)
