sedscript

<B>Digital的Unix操作系统VAX 4.2源码</B>

/yaccpar/a\
/*\
 * yydisplay -- print a symbol in human readable form.(@(#)sedscript	4.1	(ULTRIX)	7/17/90)\
 */\
#include <ctype.h>\
#define DIM(x)	(sizeof x / sizeof x[0])\
#ifdef 	ULTRIX\
#define	yy_n yyn\
#endif\
\
static char *\
yydisplay(ch)\
register int ch;\
{\
	static char buf[15];\
	static char *token[] = {\
#include "y.tok.h"\
		0};\
\
	switch (ch)\
	{\
	case 0:\
		return "[end of file]";\
	\
	case YYERRCODE:\
		return "[error]";\
\
	case '\b':\
		return "'\\b'";\
\
	case '\f':\
		return "'\\f'";\
\
	case '\n':\
		return "'\\n'";\
\
	case '\r':\
		return "'\\r'";\
\
	case '\t':\
		return "'\\t'";\
	}\
	if ( ch > 256 && ch < 256 + DIM(token))\
		return token[ch -257];\
	if (isascii(ch) && isprint(ch))\
		sprintf(buf, "'%c'", ch);\
	else if (ch < 256)\
		sprintf(buf, "char %2x", ch);\
	else\
		sprintf(buf, "token %d", ch);\
	return buf;\
}

/"syntax error"/c\
			if ((yy_n = yypact[yystate]) > YYFLAG && yy_n < YYLAST)\
			{\
				register int x;\
\
				for (x = yy_n > 0 ? yy_n : 0; x < YYLAST; x++)\
					if (yychk[yyact[x]] == x - yy_n\
					    &&\
					    x - yy_n != YYERRCODE)\
						yyerror(0, yydisplay(x - yy_n));\
			}\
			yyerror(0, 0);