BSD 4.4 Lite bin Sources

1 files changed, 86 insertions, 0 deletions

diff --git a/bin/sh/arith_lex.l b/bin/sh/arith_lex.l
new file mode 100644
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+%{
+/*-
+ * Copyright (c) 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kenneth Almquist.
+ *
+ * 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.
+ */
+
+#ifndef lint
+static char sccsid[] = "@(#)arith_lex.l	8.1 (Berkeley) 5/31/93";
+#endif /* not lint */
+
+#include "y.tab.h"
+
+extern yylval;
+extern char *arith_buf, *arith_startbuf;
+int arith_wasoper;
+#undef YY_INPUT
+#define YY_INPUT(buf,result,max) \
+	result = (*buf = *arith_buf++) ? 1 : YY_NULL;
+%}
+
+%%
+[ \t\n]	{ ; }
+[0-9]+	{ arith_wasoper = 0; yylval = atol(yytext); return(ARITH_NUM); }
+"("	{ arith_wasoper = 1; return(ARITH_LPAREN); }
+")"	{ arith_wasoper = 0; return(ARITH_RPAREN); }
+"||"	{ arith_wasoper = 1; return(ARITH_OR); }
+"&&"	{ arith_wasoper = 1; return(ARITH_AND); }
+"=="	{ arith_wasoper = 1; return(ARITH_EQ); }
+">"	{ arith_wasoper = 1; return(ARITH_GT); }
+">="	{ arith_wasoper = 1; return(ARITH_GEQ); }
+"<"	{ arith_wasoper = 1; return(ARITH_LT); }
+"<="	{ arith_wasoper = 1; return(ARITH_LEQ); }
+"!="	{ arith_wasoper = 1; return(ARITH_NEQ); }
+"*"	{ arith_wasoper = 1; return(ARITH_MULT); }
+"/"	{ arith_wasoper = 1; return(ARITH_DIV); }
+"%"	{ arith_wasoper = 1; return(ARITH_REM); }
+"+"	{ if (!arith_wasoper) {	/* ignore unary plus */
+		arith_wasoper = 1; 
+		return(ARITH_ADD);
+	 } 
+	}	
+"-"	{ if (arith_wasoper) {
+		return(ARITH_UNARYMINUS);
+	  } else {
+		arith_wasoper = 1;
+		return(ARITH_SUBT);
+	  }
+	}
+"!"	{ arith_wasoper = 1; return(ARITH_NOT); }
+.	{ error("arith: syntax error: \"%s\"\n", arith_startbuf); }
+%%
+
+arith_lex_reset() {
+	YY_NEW_FILE;
+}