.\" Copyright (c) 1990, 1991, 1993 .\" The Regents of the University of California. All rights reserved. .\" .\" This code is derived from software contributed to Berkeley by .\" the American National Standards Committee X3, on Information .\" Processing Systems. .\" .\" Redistribution and use in source and binary forms, with or without .\" modification, are permitted provided that the following conditions .\" are met: .\" 1. Redistributions of source code must retain the above copyright .\" notice, this list of conditions and the following disclaimer. .\" 2. Redistributions in binary form must reproduce the above copyright .\" notice, this list of conditions and the following disclaimer in the .\" documentation and/or other materials provided with the distribution. .\" 3. All advertising materials mentioning features or use of this software .\" must display the following acknowledgement: .\" This product includes software developed by the University of .\" California, Berkeley and its contributors. .\" 4. Neither the name of the University nor the names of its contributors .\" may be used to endorse or promote products derived from this software .\" without specific prior written permission. .\" .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF .\" SUCH DAMAGE. .\" .\" @(#) stdarg. 3 8.1 (Berkeley) 6/5/93 .\" %FreeBSD: src/share/man/man3/stdarg. 3, v 1.4. 2.5 2001/12/17 11:30:11 ru Exp % .\" $FreeBSD: doc/ja_JP.eucJP/man/man3/stdarg. 3, v 1.5 2002/05/18 07:12:56 horikawa Exp $ .\" .Dd June 5, 1993 .Dt STDARG 3 .Os .Sh ¸íĪ .Nm stdarg .Nd º¯¼ö Àμö ¸®½ºÆ® .Sh ¼­½Ä .In stdarg.h .Ft void .Fn va_start "va_list ap" last .Ft type .Fn va_arg "va_list ap" type .Ft void .Fn va_end "va_list ap" .Sh ÇØ¼³ ÇÔ¼ö´Â ´Ù¾çÇÑ ÇüÅÂÀÇ ´Ù¾çÇÑ ¼öÀÇ Àμö·Î È£ÃâÇÒ ¼ö ÀÖ½À´Ï´Ù. ÀÎŬ·çµå ÆÄÀÏ .Aq Pa stdarg.h (Àº)´Â, ÇüÅ .Pq Em va_list (À»)¸¦ ¼±¾ðÇØ, ºÒ·Á °¡´Â ÇÔ¼ö¿¡´Â ¼ýÀÚ¿Í ÇüŰ¡ ¹ÌÁöÀÇ Àμö ¸®½ºÆ®¸¦ ½ºÅÜ Çϱâ À§Çؼ­ 3 °³ÀÇ ¸ÅÅ©·Î¸¦ Á¤ÀÇÇÕ´Ï´Ù. .Pp ºÒ·Á °¡´Â ÇÔ¼ö´Â, .Em va_list ÇüÅÂÀÇ ¿ÀºêÁ§Æ®¸¦ ¼±¾ðÇÒ Çʿ䰡 ÀÖ½À´Ï´Ù. À̰ÍÀº, ¸ÅÅ©·Î .Fn va_start , .Fn va_arg , .Fn va_end ¿¡ ÀÇÇØ »ç¿ëµË´Ï´Ù. .Pp .Fn va_start ¸ÅÅ©·Î´Â, .Fn va_arg (¿Í)°ú .Fn va_end ÇÏÁö¸¸ ÈÄ¿¡ »ç¿ëÇÑ´Ù .Fa ap (À»)¸¦ ÃʱâÈ­ÇØ, ÃÖÃʷΠȣÃâÇÒ Çʿ䰡 ÀÖ½À´Ï´Ù. .Pp ÆÄ¶ó¹ÌÅÍ .Fa last (Àº)´Â º¯¼ö Àμö ¸®½ºÆ®ÀÇ ÀüÀÇ ¸¶Áö¸· ÆÄ¶ó¹ÌÅÍÀÇ À̸§ÀÔ´Ï´Ù. Áï, È£Ãâ ÇÔ¼ö°¡ ÇüŸ¦ ÀνÄÇϰí ÀÖ´Â ¸¶Áö¸· ÆÄ¶ó¹ÌÅÍÀÔ´Ï´Ù. .Pp ÀÌ ÆÄ¶ó¹ÌÅÍÀÇ ÁÖ¼Ò´Â .Fn va_start ¸ÅÅ©·Î·Î »ç¿ëµÇ¹Ç·Î, ·¹Áö½ºÅÍ º¯¼ö ¶Ç´Â ÇÔ¼ö ¶Ç´Â ¹è¿­ÇüÀ¸·Î¼­ ¼±¾ðÇØ µÇÁö ¾Ê½À´Ï´Ù. .Pp .Fn va_start ¸ÅÅ©·Î´Â °ªÀ» µ¹·ÁÁÖÁö ¾Ê½À´Ï´Ù. .Pp .Fn va_arg ¸ÅÅ©·Î´Â, È£ÃâÀÇ ´ÙÀ½ÀÇ ÀμöÀÇ ÇüÅÂ¿Í °ªÀÌ ÀÖ´Â ½Ä¿¡ Àü°³µË´Ï´Ù. ÆÄ¶ó¹ÌÅÍ .Fa ap (Àº)´Â, .Fn va_start ¿¡ ÀÇÇØ ÃʱâÈ­µÈ´Ù .Em va_list Fa ap ÀÔ´Ï´Ù. .Fn va_arg (ÀÌ)°¡ È£ÃâÇÒ °Í¿¡ .Fa ap (Àº)´Â ¼öÁ¤µÇ¾î ´ÙÀ½ÀÇ È£ÃâÀÌ ´ÙÀ½ÀÇ Àμö¸¦ µ¹·ÁÁÝ´Ï´Ù. ÆÄ¶ó¹ÌÅÍ .Fa type (Àº)´Â, ÁöÁ¤ÇüÀÇ ¿ÀºêÁ§Æ®¸¦ °¡¸®Å°´Â Æ÷ÀÎÅÍÀÇ ÇüŰ¡ * ¸¦ .Fa type ¿¡ Ãß°¡ÇÏ´Â °Í¸¸À¸·Î ¾òÀ» ¼ö ÀÖµµ·Ï(µíÀÌ) ÁöÁ¤µÈ Çü¸íÀÔ´Ï´Ù. .Pp ´ÙÀ½ÀÇ Àμö°¡ ¾ø´Â °æ¿ì, ¶Ç´Â .Fa type ÇÏÁö¸¸ (µðÆúÆ®ÀÇ Àμö »ý¼º¿¡ µû¶ó »ý¼ºµÈ °Í °°Àº) ½ÇÁ¦ÀÇ ´ÙÀ½ÀÇ ÀμöÀÇ ÇüÅÂ¿Í È£È¯¼ºÀÌ ¾ø´Â °æ¿ì, ·£´ýÀÎ ¿¡·¯°¡ ¹ß»ýÇÕ´Ï´Ù. .Pp .Fn va_start ¸ÅÅ©·ÎÀÇ µÚÀÇ ÃÖÃÊÀÇ .Fn va_arg ¸ÅÅ©·ÎÀÇ »ç¿ë¿¡ ÀÇÇØ, .Fa last ÀÇ ÈÄÀÇ Àμö°¡ µ¹·ÁÁÖ¾îÁý´Ï´Ù. ¿¬¼ÓÀûÀΠȣÃâ¿¡ ÀÇÇØ, ³ª¸ÓÁöÀÇ ÀμöÀÇ °ªÀÌ µ¹·ÁÁÖ¾îÁý´Ï´Ù. .Pp .Fn va_end ¸ÅÅ©·Î´Â, º¯¼ö Àμö ¸®½ºÆ®°¡ .Fn va_start ¿¡ ÀÇÇØ ÃʱâÈ­µÇ´Â ÇÔ¼öÀÇ Á¤»óÀûÀÎ ±Í°¡¸¦ Ãë±ÞÇÕ´Ï´Ù. .Pp .Fn va_end ¸ÅÅ©·Î´Â °ªÀ» µ¹·ÁÁÖÁö ¾Ê½À´Ï´Ù. .Sh »ç¿ë¿¹ ÇÔ¼ö .Em foo (Àº)´Â, Çü½Ä ij¸¯ÅÍÀÇ string¸¦ äÅÃÇØ ÇüŸ¦ ±âÃÊ·Î ÇØ °¢ Çü½Ä ij¸¯ÅÍ¿¡ ´ëÀÀÇÏ´Â Àμö¸¦ ÀμâÇÕ´Ï´Ù. .Bd -literal -offset indent void foo(char *fmt, ...) { va_list ap; int d; char c, *s; va_start(ap, fmt); while (*fmt) switch(*fmt++) { case 's': /* string */ s = va_arg(ap, char *); printf("string %s\en", s); break; case 'd': /* Á¤¼ö */ d = va_arg(ap, int); printf("int %d\en", d); break; case 'c': /* ij¸¯ÅÍ */ /* ÁÖÀÇ: ij¸¯ÅÍ´Â Á¤¼ö¸¦ »ý¼ºÇÑ´Ù. */ c = va_arg(ap, int); printf("char %c\en", c); break; } va_end(ap); } .Ed .Sh Ç¥ÁØ .Fn va_start , .Fn va_arg , .Fn va_end ÀÇ °¢ ¸ÅÅ©·Î´Â .St -isoC ¿¡ ÀûÇÕÇϰí ÀÖ½À´Ï´Ù. .Sh ȣȯ¼º ÀÌ·¯ÇÑ ¸ÅÅ©·Î´Â, ¿Å°Ü³õÀ» ¼ö ÀÖ´Â ¿ª»çÀûÀÎ ¸ÅÅ©·Î¿Í ȣȯ¼ºÀÌ .Em ¼± . ÈĹæ ȣȯ ¹öÁ¯Àº ÀÎŬ·çµå ÆÄÀÏ .Aq Pa varargs.h ÀÇ ¾È¿¡ ÀÖ½À´Ï´Ù. .Sh ¹ö±× .Em varargs ¸ÅÅ©·Î¿Í ´Þ¸®, .Nm ¸ÅÅ©·Î¿¡¼­´Â, ÇÁ·Î±×·¡¸Ó´Â, °íÁ¤ÇÑ Àμö°¡ ¾ø´Ù ÇÔ¼ö¸¦ ÀÛ¼ºÇÒ ¼ö°¡ ¾ø½À´Ï´Ù. ÀÌ ¹®Á¦´Â, ÁÖ·Î .Em varargs Äڵ带 .Nm ÄÚµå·Î º¯È¯ÇÒ ¶§ ÀÛ¾÷À» ÀÏÀ¸Å°°Ô ÇÕ´Ï´Ù¸¸, .Xr vfprintf 3 (¿Í)°ú °°ÀÌ, .Em va_list Àμö¸¦ ÃëÇÏ´Â ÇÔ¼ö¿¡ ¸ðµç Àμö¸¦ °Ç³×ÁÖ·Á°í ÇÏ´Â °¢Á¾ÀÇ ÇÔ¼ö¿¡ ´ëÇØ¼­µµ °ï¶õÀ» »ý±â°Ô ÇÕ´Ï´Ù.