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   puts.3p    ( 3 )

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Пролог (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.

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Имя (Name)

puts — put a string on standard output

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Синопсис (Synopsis)

#include <stdio.h>

       int puts(const char *s);

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Описание (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().

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Возвращаемое значение (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.

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Ошибки (Error)

Refer to fputc(3p).

       The following sections are informative.

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Примеры (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);
           ...

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Использование в приложениях (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.

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Обоснование (Rationale)

None.

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Будущие направления (Future directions)

None.

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Смотри также (See also)

Section 2.5, Standard I/O Streams, fopen(3p), fputs(3p), putc(3p)

       The Base Definitions volume of POSIX.1‐2017, stdio.h(0p)

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