diff options
Diffstat (limited to 'src/arith_yylex.c')
| -rw-r--r-- | src/arith_yylex.c | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/src/arith_yylex.c b/src/arith_yylex.c new file mode 100644 index 0000000..a9af68e --- /dev/null +++ b/src/arith_yylex.c @@ -0,0 +1,165 @@ +/* $Id$ */ + +/*- + * Copyright (c) 2002 + * Herbert Xu. + * 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. 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. + */ + +#include <stdlib.h> +#include "arith.h" +#include "expand.h" +#include "error.h" + +extern int yylval; +extern const char *arith_buf, *arith_startbuf; + +int +yylex() +{ + int value; + const char *buf = arith_buf; + + for (;;) { + switch (*buf) { + case ' ': + case '\t': + case '\n': + buf++; + continue; + default: +err: + error("arith: syntax error: \"%s\"", arith_startbuf); + /* NOTREACHED */ + case '0': + case '1': + case '2': + case '3': + case '4': + case '5': + case '6': + case '7': + case '8': + case '9': + yylval = strtoll(buf, (char **) &arith_buf, 0); + return ARITH_NUM; + case '=': + if (*++buf != '=') { + goto err; + } + value = ARITH_EQ; + break; + case '>': + switch (*++buf) { + case '=': + value = ARITH_GE; + break; + case '>': + value = ARITH_RSHIFT; + break; + default: + value = ARITH_GT; + goto out; + } + break; + case '<': + switch (*++buf) { + case '=': + value = ARITH_LE; + break; + case '<': + value = ARITH_LSHIFT; + break; + default: + value = ARITH_LT; + goto out; + } + break; + case '|': + if (*++buf != '|') { + value = ARITH_BOR; + goto out; + } + value = ARITH_OR; + break; + case '&': + if (*++buf != '&') { + value = ARITH_BAND; + goto out; + } + value = ARITH_AND; + break; + case '!': + if (*++buf != '=') { + value = ARITH_NOT; + goto out; + } + value = ARITH_NE; + break; + case 0: + value = 0; + goto out; + case '(': + value = ARITH_LPAREN; + break; + case ')': + value = ARITH_RPAREN; + break; + case '*': + value = ARITH_MUL; + break; + case '/': + value = ARITH_DIV; + break; + case '%': + value = ARITH_REM; + break; + case '+': + value = ARITH_ADD; + break; + case '-': + value = ARITH_SUB; + break; + case '~': + value = ARITH_BNOT; + break; + case '^': + value = ARITH_BXOR; + break; + } + break; + } + + buf++; +out: + arith_buf = buf; + return value; +} |