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[linuxjm/jm.git] / manual / LDP_man-pages / draft / man3 / fmemopen.3

.\" Copyright 2005 walter harms (walter.harms@informatik.uni-oldenburg.de),
.\" and Copyright 2005 Michael Kerrisk <mtk.manpages@gmail.com>
.\" Distributed under the GPL.
.\" 2008-12-04, Petr Baudis <pasky@suse.cz>: Document open_wmemstream()
.\"
.\" Japanese Version Copyright (c) 2005, 2006 Akihiro MOTOKI
.\"                     all rights reserved.
.\" Translated 2005-12-26, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>
.\" Updated 2006-01-20, Akihiro MOTOKI
.\" Updated 2006-07-20, Akihiro MOTOKI
.\" Updated 2008-11-08, Akihiro MOTOKI, LDP v3.13
.\" Updated 2010-04-18, Akihiro MOTOKI, LDP v3.24
.\"
.TH FMEMOPEN 3 2009-09-15 "GNU" "Linux Programmer's Manual"
.\"O .SH NAME
.SH ̾Á°
.\"O fmemopen, open_memstream, open_wmemstream \-  open memory as stream
fmemopen, open_memstream, open_wmemstream \-  ¥á¥â¥ê¤ò¥¹¥È¥ê¡¼¥à¤È¤·¤Æ¥ª¡¼¥×¥ó¤¹¤ë
.\"O .SH SYNOPSIS
.SH ½ñ¼°
.nf
.B #define _GNU_SOURCE
.B #include <stdio.h>

.BI "FILE *fmemopen(void *"buf ", size_t "size ", const char *" mode ");"

.BI "FILE *open_memstream(char **" ptr ", size_t *" sizeloc );

.B #define _GNU_SOURCE
.B #include <wchar.h>

.BI "FILE *open_wmemstream(wchar_t **" ptr ", size_t *" sizeloc );
.fi
.\"O .SH DESCRIPTION
.SH ÀâÌÀ
.\"O The
.\"O .BR fmemopen ()
.\"O function opens a stream that permits the access specified by
.\"O .IR mode .
.\"O The stream allows I/O to be performed on the string or memory buffer
.\"O pointed to by
.\"O .IR buf .
.\"O This buffer must be at least
.\"O .I size
.\"O bytes long.
.BR fmemopen ()
´Ø¿ô¤Ï¡¢¥¹¥È¥ê¡¼¥à¤ò¥ª¡¼¥×¥ó¤·¡¢¤½¤Î¥¹¥È¥ê¡¼¥à¤Ë
.I mode
¤Ç»ØÄꤵ¤ì¤¿¥¢¥¯¥»¥¹µö²Ä¤òÀßÄꤹ¤ë¡£
¤½¤Î¥¹¥È¥ê¡¼¥à¤òÄ̤¸¤Æ¡¢
.I buf
¤Ç»ØÄꤵ¤ì¤¿Ê¸»úÎó¤ä¥á¥â¥ê¥Ð¥Ã¥Õ¥¡¤Ø¤ÎÆɤ߽ñ¤­¤¬¤Ç¤­¤ë¡£
¤³¤Î¥Ð¥Ã¥Õ¥¡¤Ï¾¯¤Ê¤¯¤È¤â
.I size
¥Ð¥¤¥È¤ÎŤµ¤Ç¤Ê¤±¤ì¤Ð¤Ê¤é¤Ê¤¤¡£
.PP
.\"O The argument
.\"O .I mode
.\"O is the same as for
.\"O .BR fopen (3).
.\"O If
.\"O .I mode
.\"O specifies an append mode, then the initial file position is set to
.\"O the location of the first null byte (\(aq\\0\(aq) in the buffer;
.\"O otherwise the initial file position is set to the start of the buffer.
°ú¤­¿ô
.I mode
¤Ï
.BR fopen (3)
¤Î¾ì¹ç¤ÈƱ¤¸¤Ç¤¢¤ë¡£
.I mode
¤ÇÄɵ­¥â¡¼¥É (append mode) ¤¬»ØÄꤵ¤ì¤¿¾ì¹ç¡¢¥Õ¥¡¥¤¥ë°ÌÃ֤νé´üÃͤÏ
¥Ð¥Ã¥Õ¥¡Ãæ¤ÎºÇ½é¤Î NULL ¥Ð¥¤¥È (\(aq\\0\(aq) ¤Î°ÌÃÖ¤ËÀßÄꤵ¤ì¤ë¡£
¤½¤ì°Ê³°¤Î¾ì¹ç¤Ï¡¢¥Õ¥¡¥¤¥ë°ÌÃ֤νé´üÃͤϥХåե¡¤ÎÀèƬ¤Ë¤Ê¤ë¡£
.\"O Since glibc 2.9,
.\"O the letter 'b' may be specified as the second character in
.\"O .IR mode .
.\"O This provides "binary" mode:
.\"O writes don't implicitly add a terminating null byte, and
.\"O .BR fseek (3)
.\"O .B SEEK_END
.\"O is relative to the end of the buffer (i.e., the value specified by the
.\"O .I size
.\"O argument), rather than the current string length.
glibc 2.9 °Ê¹ß¤Ç¤Ï¡¢Ê¸»ú 'b' ¤ò
.I mode
¤ÎÆóÈÖÌܤÎʸ»ú¤È¤·¤Æ»ØÄꤹ¤ë¤³¤È¤¬¤Ç¤­¤ë¡£
¤³¤Îʸ»ú¤Ï¡Ö¥Ð¥¤¥Ê¥ê¡×¥â¡¼¥É¤ò»ØÄꤹ¤ë¤â¤Î¤Ç¤¢¤ë¡£
¤³¤Î¥â¡¼¥É¤Ç¤Ï¡¢½ñ¤­¹þ¤ß»þ¤Ëʸ»úÎó½ªÃ¼¤Î¥Ì¥ë¥Ð¥¤¥È¤¬ÌۤäÆÄɲÃ
¤µ¤ì¤ë¤³¤È¤Ï¤Ê¤¤¡£¤Þ¤¿¡¢
.BR fseek (3)
.B SEEK_END
¤Ï¡¢Ê¸»úÎó¤ÎŤµ¤«¤é¤ÎÁêÂÐÃͤǤϤʤ¯¡¢¥Ð¥Ã¥Õ¥¡¤ÎËöÈø
.RI ( size
¤Ç»ØÄꤷ¤¿ÃÍ) ¤«¤é¤ÎÁêÂÐÃͤȤʤ롣
.PP
.\"O When a stream that has been opened for writing is flushed
.\"O .RB ( fflush (3))
.\"O or closed
.\"O .RB ( fclose (3)),
.\"O a null byte is written at the end of the buffer if there is space.
.\"O The caller should ensure that an extra byte is available in the
.\"O buffer
.\"O (and that
.\"O .I size
.\"O counts that byte)
.\"O to allow for this.
½ñ¤­¹þ¤ßÍѤ˥ª¡¼¥×¥ó¤µ¤ì¤¿¥¹¥È¥ê¡¼¥à¤ò¥Õ¥é¥Ã¥·¥å
.RB ( fflush (3))
¤ä¥¯¥í¡¼¥º
.RB ( fclose (3))
¤·¤¿»þ¤Ë¡¢
(¥Ð¥Ã¥Õ¥¡¤Ë¶õ¤­¤¬¤¢¤ì¤Ð) NULL ¥Ð¥¤¥È¤¬¥Ð¥Ã¥Õ¥¡¤ÎËöÈø¤Ë½ñ¤­¹þ¤Þ¤ì¤ë¡£
¤³¤Î¤è¤¦¤Ë¤¹¤ë¤¿¤á¤Ë¤Ï¡¢¸Æ¤Ó½Ð¤·¸µ¤Ï
¥Ð¥Ã¥Õ¥¡¤Ë 1¥Ð¥¤¥È;͵¤òºî¤ë
.RI ( size
¤Ë¤³¤Î 1¥Ð¥¤¥È¤ò´Þ¤á¤¿Ãͤò»ØÄꤹ¤ë) ɬÍפ¬¤¢¤ë¡£

.\"O Attempts to write more than
.\"O .I size
.\"O bytes to the buffer result in an error.
¥Ð¥Ã¥Õ¥¡¤Ë
.I size
¥Ð¥¤¥È¤è¤ê¤¿¤¯¤µ¤ó½ñ¤­¹þ¤â¤¦¤È¤·¤¿¾ì¹ç¤Ë¤Ï¡¢¥¨¥é¡¼¤È¤Ê¤ë¡£
.\"O (By default, such errors will only be visible when the
.\"O .I stdio
.\"O buffer is flushed.
.\"O Disabling buffering with
.\"O .I setbuf(fp,\ NULL)
.\"O may be useful to detect errors at the time of an output operation.
.\"O Alternatively, the caller can explicitly set
.\"O .I buf
.\"O as the stdio stream buffer, at the same time informing stdio
.\"O of the buffer's size, using
.\"O .IR "setbuffer(fp, buf, size)" .)
(¥Ç¥Õ¥©¥ë¥È¤Ç¤Ï¡¢¤³¤Î¤è¤¦¤Ê¥¨¥é¡¼¤¬¸«¤¨¤ë¤Î¤Ï
.I stdio
¥Ð¥Ã¥Õ¥¡¤¬¥Õ¥é¥Ã¥·¥å¤µ¤ì¤¿»þ¤À¤±¤Ç¤¢¤ë¡£
.I setbuf(fp,\ NULL)
¤ò»È¤Ã¤Æ¥Ð¥Ã¥Õ¥¡¥ê¥ó¥°¤ò̵¸ú¤Ë¤¹¤ëÊýË¡¤Ï¡¢
½ÐÎÏÁàºî¤ò¹Ô¤Ã¤¿»þÅÀ¤Ç¥¨¥é¡¼¤ò¸¡½Ð¤¹¤ë¤Î¤ËÌòΩ¤Ä¡£
Ê̤ÎÊýË¡¤È¤·¤Æ¤Ï¡¢
.IR "setbuffer(fp, buf, size)"
¤ò»È¤Ã¤Æ¡¢¸Æ¤Ó½Ð¤·Â¦¤¬ÌÀ¼¨Åª¤Ë
stdio ¥¹¥È¥ê¡¼¥à¥Ð¥Ã¥Õ¥¡¤È¤·¤Æ
.I buf
¤ò»ØÄꤷ¡¢¥Ð¥Ã¥Õ¥¡¤Î»ØÄê»þ¤Ë¥Ð¥Ã¥Õ¥¡¤Î¥µ¥¤¥º¤ò
stdio ¤Ë¶µ¤¨¤ëÊýË¡¤¬¤¢¤ë¡£)
.\" See http://sourceware.org/bugzilla/show_bug.cgi?id=1995
.\" and
.\" http://sources.redhat.com/ml/libc-alpha/2006-04/msg00064.html
.PP
.\"O In a stream opened for reading,
.\"O null bytes (\(aq\\0\(aq) in the buffer do not cause read
.\"O operations to return an end-of-file indication.
.\"O A read from the buffer will only indicate end-of-file
.\"O when the file pointer advances
.\"O .I size
.\"O bytes past the start of the buffer.
Æɤ߽Ф·ÍѤ˥ª¡¼¥×¥ó¤µ¤ì¤¿¥¹¥È¥ê¡¼¥à¤Ç¤Ï¡¢
¥Ð¥Ã¥Õ¥¡Æâ¤Ë NULL ¥Ð¥¤¥È (\(aq\\0\(aq) ¤¬¤¢¤Ã¤Æ¤â
Æɤ߽Ф·Áàºî¤¬¥Õ¥¡¥¤¥ëËöÈø (end-of-file) ¤òÊÖ¤¹¤³¤È¤Ï¤Ê¤¤¡£
¥Ð¥Ã¥Õ¥¡¤«¤é¤ÎÆɤ߽Ф·¤Ç¥Õ¥¡¥¤¥ëËöÈø¤¬ÊÖ¤ë¤Î¤Ï¡¢
¥Õ¥¡¥¤¥ë¥Ý¥¤¥ó¥¿¤¬¥Ð¥Ã¥Õ¥¡¤ÎÀèƬ¤«¤é
.I size
¥Ð¥¤¥È¤ò±Û¤¨¤ÆÀè¤Ë¿Ê¤â¤¦¤È¤·¤¿¾ì¹ç¤À¤±¤Ç¤¢¤ë¡£
.PP
.\"O If
.\"O .I buf
.\"O is specified as NULL, then
.\"O .BR fmemopen ()
.\"O dynamically allocates a buffer
.\"O .I size
.\"O bytes long.
.I buf
¤Ë NULL ¤¬»ØÄꤵ¤ì¤¿¾ì¹ç¡¢
.BR fmemopen ()
¤ÏưŪ¤Ë
.I size
¥Ð¥¤¥È¤ÎŤµ¤Î¥Ð¥Ã¥Õ¥¡¤ò³ÎÊݤ¹¤ë¡£
.\"O This is useful for an application that wants to write data to
.\"O a temporary buffer and then read it back again.
.\"O The buffer is automatically freed when the stream is closed.
.\"O Note that the caller has no way to obtain a pointer to the
.\"O temporary buffer allocated by this call (but see
.\"O .BR open_memstream ()
.\"O below).
¤³¤ÎÊýË¡¤Ï¡¢°ì»þ¥Ð¥Ã¥Õ¥¡¤Ë¥Ç¡¼¥¿¤Î½ñ¤­¹þ¤ß¤ò¹Ô¤Ã¤Æ¤«¤é¡¢
¤½¤ÎÆâÍƤòºÆÅÙÆɤ߽Ф¹¤è¤¦¤Ê¥¢¥×¥ê¥±¡¼¥·¥ç¥ó¤ÇÍ­ÍѤǤ¢¤ë¡£
¤³¤Î¥Ð¥Ã¥Õ¥¡¤Ï¥¹¥È¥ê¡¼¥à¤¬¥¯¥í¡¼¥º¤µ¤ì¤ë¤È¤­¤Ë¼«Æ°Åª¤Ë²òÊü¤µ¤ì¤ë¡£
¸Æ¤Ó½Ð¤·¸µ¤«¤é¤Ï¤³¤Î´Ø¿ô¤¬³ä¤êÅö¤Æ¤¿°ì»þ¥Ð¥Ã¥Õ¥¡¤Ø¤Î¥Ý¥¤¥ó¥¿Ãͤò
ÃΤëÊýË¡¤Ï¸ºß¤·¤Ê¤¤ÅÀ¤ËÃí°Õ (²¼µ­¤Î
.BR open_memstream ()
¤â»²¾È)¡£

.\"O The
.\"O .BR open_memstream ()
.\"O function opens a stream for writing to a buffer.
.\"O The buffer
.\"O is dynamically allocated (as with
.\"O .BR malloc (3)),
.\"O and automatically grows as required.
.\"O After closing the stream, the caller should
.\"O .BR free (3)
.\"O this buffer.
.BR open_memstream ()
´Ø¿ô¤Ï¡¢¥Ð¥Ã¥Õ¥¡¤Ø¤Î½ñ¤­¹þ¤ßÍѤ˥¹¥È¥ê¡¼¥à¤ò¥ª¡¼¥×¥ó¤¹¤ë¡£
¥Ð¥Ã¥Õ¥¡¤Ï
.RB ( malloc (3)
¤ò»È¤Ã¤Æ) ưŪ¤Ë³ä¤êÅö¤Æ¤é¤ì¡¢É¬Íפ˱þ¤¸¤Æ¼«Æ°Åª¤Ë¿­Ä¹¤¹¤ë¡£
¥¹¥È¥ê¡¼¥à¤ò¥¯¥í¡¼¥º¤·¤¿¸å¤Ç¡¢¸Æ¤Ó½Ð¤·¸µ¤Ï¤³¤Î¥Ð¥Ã¥Õ¥¡¤ò
.BR free (3)
¤¹¤Ù¤­¤Ç¤¢¤ë¡£

.\"O When the stream is closed
.\"O .RB ( fclose (3))
.\"O or flushed
.\"O .RB ( fflush (3)),
.\"O the locations pointed to by
.\"O .I ptr
.\"O and
.\"O .I sizeloc
.\"O are updated to contain, respectively, a pointer to the buffer and the
.\"O current size of the buffer.
.\"O These values remain valid only as long as the caller
.\"O performs no further output on the stream.
.\"O If further output is performed, then the stream
.\"O must again be flushed before trying to access these variables.
¤³¤Î¥¹¥È¥ê¡¼¥à¤¬
¥¯¥í¡¼¥º
.RB ( fclose (3))
¤µ¤ì¤¿¤ê¥Õ¥é¥Ã¥·¥å
.RB ( fflush (3))
¤µ¤ì¤¿»þ¤Ë¡¢
.I ptr
¤È
.I sizeloc
¤ÎÃͤϤ½¤ì¤¾¤ì¥Ð¥Ã¥Õ¥¡¤Ø¤Î¥Ý¥¤¥ó¥¿¤È¤½¤Î¥µ¥¤¥º¤Ë¹¹¿·¤µ¤ì¤ë¡£
¤³¤ì¤é¤ÎÃͤϡ¢¸Æ¤Ó½Ð¤·¸µ¤¬¤½¤Î¥¹¥È¥ê¡¼¥à¤Ë¿·¤¿¤Ê½ñ¤­¹þ¤ß¤ò
¹Ô¤ï¤Ê¤¤¾ì¹ç¤Ë¸Â¤êÍ­¸ú¤Ç¤¢¤ë¡£
¥¹¥È¥ê¡¼¥à¤Ë½ñ¤­¹þ¤ß¤ò¹Ô¤Ã¤¿ºÝ¤Ë¤Ï¡¢¤³¤ì¤é¤ÎÊÑ¿ô¤ò»²¾È¤¹¤ëÁ°¤Ë
¥¹¥È¥ê¡¼¥à¤òºÆÅÙ¥Õ¥é¥Ã¥·¥å¤·¤Ê¤±¤ì¤Ð¤Ê¤é¤Ê¤¤¡£

.\"O A null byte is maintained at the end of the buffer.
.\"O This byte is
.\"O .I not
.\"O included in the size value stored at
.\"O .IR sizeloc .
¥Ð¥Ã¥Õ¥¡ËöÈø¤Î NULL ¥Ð¥¤¥È¤ÏÊÝ»ý¤µ¤ì¤ë¡£
¤³¤Î NULL ¥Ð¥¤¥È¤Ï
.I sizeloc
¤Ë³ÊǼ¤µ¤ì¤ë¥µ¥¤¥º¤Ë¤Ï¡Ö´Þ¤Þ¤ì¤Ê¤¤¡×¡£

.\"O The stream's file position can be changed with
.\"O .BR fseek (3)
.\"O or
.\"O .BR fseeko (3).
.\"O Moving the file position past the end
.\"O of the data already written fills the intervening space with
.\"O zeros.
¥¹¥È¥ê¡¼¥à¤Î¥Õ¥¡¥¤¥ë°ÌÃÖ¤Ï
.BR fseek (3)
¤ä
.BR fseeko (3)
¤ÇÊѹ¹¤Ç¤­¤ë¡£
¤¹¤Ç¤Ë¥Ç¡¼¥¿¤¬½ñ¤­¹þ¤Þ¤ì¤¿Îΰè¤ÎËöÈø¤è¤êÀè¤Ë¥Õ¥¡¥¤¥ë°ÌÃÖ¤òÆ°¤«¤¹¤È¡¢
¤½¤Î´Ö¤ÎÎΰè¤Ï 0 ¤ÇËä¤á¤é¤ì¤ë¡£

.\"O The
.\"O .BR open_wmemstream ()
.\"O is similar to
.\"O .BR open_memstream (),
.\"O but operates on wide characters instead of bytes.
.BR open_wmemstream ()
¤Ï
.BR open_memstream ()
¤ÈƱÍͤÀ¤¬¡¢¥Ð¥¤¥È¤Ç¤Ï¤Ê¤¯¥ï¥¤¥Éʸ»ú¤ËÂФ·¤ÆÁàºî¤ò¹Ô¤¦ÅÀ¤¬°Û¤Ê¤ë¡£
.\"O .SH "RETURN VALUE"
.SH ÊÖ¤êÃÍ
.\"O Upon successful completion
.\"O .BR fmemopen (),
.\"O .BR open_memstream ()
.\"O and
.\"O .BR open_wmemstream ()
.\"O return a
.\"O .I FILE
.\"O pointer.
.\"O Otherwise, NULL is returned and
.\"O .I errno
.\"O is set to indicate the error.
À®¸ù¤·¤Æ½ªÎ»¤·¤¿¾ì¹ç¤Ë¤Ï¡¢
.BR fmemopen (),
.BR open_memstream (),
.BR open_wmemstream ()
¤Ï
.I FILE
¥Ý¥¤¥ó¥¿¤òÊÖ¤¹¡£
¼ºÇÔ¤·¤¿¾ì¹ç¤Ï¡¢ NULL ¤òÊÖ¤·¡¢
.I errno
¤Ë¥¨¥é¡¼¤ò¼¨¤¹Ãͤò¥»¥Ã¥È¤¹¤ë¡£
.\"O .SH VERSIONS
.SH ¥Ð¡¼¥¸¥ç¥ó
.\"O .BR fmemopen ()
.\"O and
.\"O .BR open_memstream ()
.\"O were already available in glibc 1.0.x.
.\"O .BR open_wmemstream ()
.\"O is available since glibc 2.4.
.BR fmemopen ()
¤È
.BR open_memstream ()
¤Ï glibc 1.0.x ¤Ç¤¹¤Ç¤ËÍøÍѲÄǽ¤Ç¤¢¤Ã¤¿¡£
.BR open_wmemstream ()
¤Ï glibc 2.4 °Ê¹ß¤ÇÍøÍѲÄǽ¤Ç¤¢¤ë¡£
.\"O .SH "CONFORMING TO"
.SH ½àµò
POSIX.1-2008.
.\"O These functions are not specified in POSIX.1-2001,
.\"O and are not widely available on other systems.
¤³¤ì¤é¤Î´Ø¿ô¤Ï POSIX.1-2001 ¤Ç¤Ïµ¬Äê¤ì¤Æ¤¤¤Ê¤¤¤¬¡¢
Linux °Ê³°¤Î¥·¥¹¥Æ¥à¤Ç¹­¤¯ÍøÍѲÄǽ¤Ç¤¢¤ë¡£
.\"O .SH NOTES
.SH Ãí°Õ
.\"O There is no file descriptor associated with the file stream
.\"O returned by these functions
.\"O (i.e.,
.\"O .BR fileno (3)
.\"O will return an error if called on the returned stream).
¤³¤ì¤é¤Î´Ø¿ô¤¬ÊÖ¤¹¥Õ¥¡¥¤¥ë¥¹¥È¥ê¡¼¥à¤ËÂбþ¤¹¤ë¥Õ¥¡¥¤¥ë
¥Ç¥£¥¹¥¯¥ê¥×¥¿¤Ï¤Ê¤¤ (¤Ä¤Þ¤ê¡¢ÊÖ¤µ¤ì¤¿¥¹¥È¥ê¡¼¥à¤ËÂФ·¤Æ
.BR fileno (3)
¤ò¸Æ¤Ó½Ð¤¹¤È¥¨¥é¡¼¤¬Ê֤뤳¤È¤Ë¤Ê¤ë)¡£
.\"O .SH BUGS
.SH ¥Ð¥°
.\"O In glibc before version 2.7, seeking past the end of a stream created by
.\"O .BR open_memstream ()
.\"O does not enlarge the buffer; instead the
.\"O .BR fseek ()
.\"O call fails, returning \-1.
.\"O .\" http://sourceware.org/bugzilla/show_bug.cgi?id=1996
¥Ð¡¼¥¸¥ç¥ó 2.7 ¤è¤êÁ°¤Î glibc ¤Ç¤Ï¡¢
.BR open_memstream ()
¤ÇºîÀ®¤µ¤ì¤¿¥¹¥È¥ê¡¼¥à¤ÎËöÈø¤è¤êÀè¤Ë¥Õ¥¡¥¤¥ë°ÌÃÖ¤òÆ°¤«¤·¤Æ¤â¡¢
¥Ð¥Ã¥Õ¥¡¤¬¿­Ä¹¤µ¤ì¤º¡¢
.BR fseek ()
¤¬¼ºÇÔ¤· \-1 ¤¬Ê֤롣
.\" http://sourceware.org/bugzilla/show_bug.cgi?id=1996
.\"O .SH "EXAMPLE"
.SH Îã
.\"O The program below uses
.\"O .BR fmemopen ()
.\"O to open an input buffer, and
.\"O .BR open_memstream ()
.\"O to open a dynamically sized output buffer.
.\"O The program scans its input string (taken from the program's
.\"O first command-line argument) reading integers,
.\"O and writes the squares of these integers to the output buffer.
.\"O An example of the output produced by this program is the following:
¤³¤Î¥×¥í¥°¥é¥à¤Ï
.BR fmemopen ()
¤ò»È¤Ã¤Æ½ÐÎϥХåե¡¤ò¥ª¡¼¥×¥ó¤·¡¢
.BR open_memstream ()
¤ò»È¤Ã¤ÆưŪ¤Ë¥µ¥¤¥º¤¬ÊѲ½¤¹¤ë½ÐÎϥХåե¡¤ò¥ª¡¼¥×¥ó¤·¤Æ¤¤¤ë¡£
(¥×¥í¥°¥é¥à¤ÎÂè°ì¥³¥Þ¥ó¥É¥é¥¤¥ó°ú¤­¿ô¤«¤é¼è¤Ã¤¿) ÆþÎÏʸ»úÎó¤ò
¥¹¥­¥ã¥ó¤·¤ÆÀ°¿ô¤òÆɤ߹þ¤ß¡¢¤³¤ì¤é¤ÎÀ°¿ô¤ÎÆó¾è¤ò½ÐÎϥХåե¡¤Ë½ñ¤­½Ð¤¹¡£
¤³¤Î¥×¥í¥°¥é¥à¤Î¼Â¹ÔÎã¤Ï°Ê²¼¤Î¤è¤¦¤Ë¤Ê¤ë¡£
.in +4n
.nf

.RB "$" " ./a.out \(aq1 23 43\(aq"
size=11; ptr=1 529 1849
.fi
.in
.\"O .SS Program source
.SS ¥×¥í¥°¥é¥à¤Î¥½¡¼¥¹
\&
.nf
#define _GNU_SOURCE
#include <string.h>
#include <stdio.h>
#include <stdlib.h>

#define handle_error(msg) \\
    do { perror(msg); exit(EXIT_FAILURE); } while (0)

int
main(int argc, char *argv[])
{
    FILE *out, *in;
    int v, s;
    size_t size;
    char *ptr;

    if (argc != 2) {
        fprintf(stderr, "Usage: %s <file>\\n", argv[0]);
        exit(EXIT_FAILURE);
    }

    in = fmemopen(argv[1], strlen(argv[1]), "r");
    if (in == NULL)
        handle_error("fmemopen");

    out = open_memstream(&ptr, &size);
    if (out == NULL)
        handle_error("fmemopen");

    for (;;) {
        s = fscanf(in, "%d", &v);
        if (s <= 0)
            break;

        s = fprintf(out, "%d ", v * v);
        if (s == \-1)
            handle_error("fprintf");
    }
    fclose(in);
    fclose(out);
    printf("size=%ld; ptr=%s\\n", (long) size, ptr);
    free(ptr);
    exit(EXIT_SUCCESS);
}
.fi
.\"O .SH "SEE ALSO"
.SH ´ØÏ¢¹àÌÜ
.BR fopen (3),
.BR fopencookie (3),
.BR feature_test_macros (7)