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'\" et
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.TH FPUTS "3P" 2013 "IEEE/The Open Group" "POSIX Programmer's Manual"
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.SH PROLOG
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This manual page is part of the POSIX Programmer's Manual.
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The Linux implementation of this interface may differ (consult
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the corresponding Linux manual page for details of Linux behavior),
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or the interface may not be implemented on Linux.
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.SH NAME
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fputs
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\(em put a string on a stream
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.SH SYNOPSIS
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.LP
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.nf
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#include <stdio.h>
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.P
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int fputs(const char *restrict \fIs\fP, FILE *restrict \fIstream\fP);
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.fi
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.SH DESCRIPTION
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The functionality described on this reference page is aligned with the
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ISO\ C standard. Any conflict between the requirements described here and the
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ISO\ C standard is unintentional. This volume of POSIX.1\(hy2008 defers to the ISO\ C standard.
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.P
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The
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\fIfputs\fR()
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function shall write the null-terminated string pointed to by
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.IR s
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to the stream pointed to by
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.IR stream .
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The terminating null byte shall not be written.
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.P
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The last data modification and last file status change timestamps
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of the file shall be marked for update between the successful
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execution of
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\fIfputs\fR()
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and the next successful completion of a call to
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\fIfflush\fR()
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or
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\fIfclose\fR()
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on the same stream or a call to
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\fIexit\fR()
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or
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\fIabort\fR().
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.SH "RETURN VALUE"
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Upon successful completion,
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\fIfputs\fR()
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shall return a non-negative number. Otherwise, it shall return EOF,
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set an error indicator for the stream,
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and set
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.IR errno
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to indicate the error.
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.SH ERRORS
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Refer to
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.IR "\fIfputc\fR\^(\|)".
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.LP
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.IR "The following sections are informative."
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.SH EXAMPLES
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.SS "Printing to Standard Output"
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.P
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The following example gets the current time, converts it to a string
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using
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\fIlocaltime\fR()
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and
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\fIasctime\fR(),
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and prints it to standard output using
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\fIfputs\fR().
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It then prints the number of minutes to an event for which it is
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waiting.
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.sp
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.RS 4
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.nf
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\fB
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#include <time.h>
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#include <stdio.h>
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\&...
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time_t now;
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int minutes_to_event;
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\&...
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time(&now;;
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printf("The time is ");
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fputs(asctime(localtime(&now)), stdout);
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printf("There are still %d minutes to the event.\en",
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minutes_to_event);
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\&...
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.fi \fR
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.P
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.RE
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.SH "APPLICATION USAGE"
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The
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\fIputs\fR()
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function appends a
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<newline>
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while
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\fIfputs\fR()
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does not.
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.P
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This volume of POSIX.1\(hy2008 requires that successful completion simply return a non-negative
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integer. There are at least three known different implementation
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conventions for this requirement:
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.IP " *" 4
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Return a constant value.
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.IP " *" 4
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Return the last character written.
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.IP " *" 4
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Return the number of bytes written. Note that this implementation
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convention cannot be adhered to for strings longer than
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{INT_MAX}
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bytes as the value would not be representable in the return type of the
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function. For backwards-compatibility, implementations can return the
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number of bytes for strings of up to
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{INT_MAX}
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bytes, and return
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{INT_MAX}
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for all longer strings.
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.SH RATIONALE
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The
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\fIfputs\fR()
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function is one whose source code was specified in the referenced \fIThe C Programming Language\fP. In the
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original edition, the function had no defined return value, yet many
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practical implementations would, as a side-effect, return the value of the
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last character written as that was the value remaining in the accumulator
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used as a return value. In the second edition of the book, either the
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fixed value 0 or EOF would be returned depending upon the return value of
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\fIferror\fR();
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however, for compatibility with extant implementations, several
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implementations would, upon success, return a positive value representing
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the last byte written.
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.SH "FUTURE DIRECTIONS"
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None.
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.SH "SEE ALSO"
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.IR "Section 2.5" ", " "Standard I/O Streams",
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.IR "\fIfopen\fR\^(\|)",
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.IR "\fIputc\fR\^(\|)",
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.IR "\fIputs\fR\^(\|)"
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.P
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The Base Definitions volume of POSIX.1\(hy2008,
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.IR "\fB<stdio.h>\fP"
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.SH COPYRIGHT
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Portions of this text are reprinted and reproduced in electronic form
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from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
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-- Portable Operating System Interface (POSIX), The Open Group Base
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Specifications Issue 7, Copyright (C) 2013 by the Institute of
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Electrical and Electronics Engineers, Inc and The Open Group.
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(This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In the
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event of any discrepancy between this version and the original IEEE and
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The Open Group Standard, the original IEEE and The Open Group Standard
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is the referee document. The original Standard can be obtained online at
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http://www.unix.org/online.html .
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Any typographical or formatting errors that appear
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in this page are most likely
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to have been introduced during the conversion of the source files to
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man page format. To report such errors, see
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https://www.kernel.org/doc/man-pages/reporting_bugs.html .
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