/*?flex?-?tool?to?generate?fast?lexical?analyzers?*/

/*??Copyright?（c）?1990?The?Regents?of?the?University?of?California.?*/
/*??All?rights?reserved.?*/

/*??This?code?is?derived?from?software?contributed?to?Berkeley?by?*/
/*??Vern?Paxson.?*/

/*??The?United?States?Government?has?rights?in?this?work?pursuant?*/
/*??to?contract?no.?DE-AC03-76SF00098?between?the?United?States?*/
/*??Department?of?Energy?and?the?University?of?California.?*/

/*??This?file?is?part?of?flex.?*/

/*??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.?*/

/*??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?‘‘AS?IS‘‘?AND?WITHOUT?ANY?EXPRESS?OR?*/
/*??IMPLIED?WARRANTIES?INCLUDING?WITHOUT?LIMITATION?THE?IMPLIED?*/
/*??WARRANTIES?OF?MERCHANTABILITY?AND?FITNESS?FOR?A?PARTICULAR?*/
/*??PURPOSE.?*/

#include?“flexdef.h“

/*?Take?note:?The?buffer?object?is?sometimes?used?as?a?String?buffer?（one
?*?continuous?string）?and?sometimes?used?as?a?list?of?strings?usually?line?by
?*?line.
?*?
?*?The?type?is?specified?in?buf_init?by?the?elt_size.?If?the?elt_size?is
?*?sizeof（char）?then?the?buffer?should?be?treated?as?string?buffer.?If?the
?*?elt_size?is?sizeof（char*）?then?the?buffer?should?be?treated?as?a?list?of
?*?strings.
?*
?*?Certain?functions?are?only?appropriate?for?one?type?or?the?other.?
?*/

/*?global?buffers.?*/
struct?Buf?userdef_buf;		/**struct?Buf?defs_buf;		/**struct?Buf?yydmap_buf;		/**struct?Buf?m4defs_buf;??????????/**struct?Buf?top_buf;?????????????/**
struct?Buf?*buf_print_strings（struct?Buf?*?buf?FILE*?out）
{
????int?i;

????if（!buf?||?!out）
????????return?buf;

????for?（i=0;?i?nelts;?i++）{
????????const?char?*?s?=?（（char**）buf->elts）[i];
????????if（s）
????????????fprintf（out?“%s“?s）;
????}
????return?buf;
}

/*?Append?a?“%s“?formatted?string?to?a?string?buffer?*/
struct?Buf?*buf_prints?（struct?Buf?*buf?const?char?*fmt?const?char?*s）
{
	char???*t;
????????size_t?tsz;

	t?=?flex_alloc?（tsz?=?strlen?（fmt）?+?strlen?（s）?+?1）;
	snprintf?（t?tsz?fmt?s）;
	buf?=?buf_strappend?（buf?t）;
	flex_free?（t）;
	return?buf;
}

/**?Append?a?line?directive?to?the?string?buffer.
?*?@param?buf?A?