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Diffstat (limited to 'usr/dash/arith_yylex.c')
| -rw-r--r-- | usr/dash/arith_yylex.c | 240 |
1 files changed, 240 insertions, 0 deletions
diff --git a/usr/dash/arith_yylex.c b/usr/dash/arith_yylex.c new file mode 100644 index 0000000..ec5b5b2 --- /dev/null +++ b/usr/dash/arith_yylex.c @@ -0,0 +1,240 @@ +/*- + * 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 <inttypes.h> +#include <stdlib.h> +#include <string.h> +#include "arith_yacc.h" +#include "expand.h" +#include "error.h" +#include "shell.h" +#include "memalloc.h" +#include "syntax.h" +#include "system.h" + +#if ARITH_BOR + 11 != ARITH_BORASS || ARITH_ASS + 11 != ARITH_EQ +#error Arithmetic tokens are out of order. +#endif + +extern const char *arith_buf; + +int +yylex() +{ + int value; + const char *buf = arith_buf; + const char *p; + + for (;;) { + value = *buf; + switch (value) { + case ' ': + case '\t': + case '\n': + buf++; + continue; + default: + return ARITH_BAD; + case '0': + case '1': + case '2': + case '3': + case '4': + case '5': + case '6': + case '7': + case '8': + case '9': + yylval.val = strtoimax(buf, (char **)&arith_buf, 0); + return ARITH_NUM; + case 'A': + case 'B': + case 'C': + case 'D': + case 'E': + case 'F': + case 'G': + case 'H': + case 'I': + case 'J': + case 'K': + case 'L': + case 'M': + case 'N': + case 'O': + case 'P': + case 'Q': + case 'R': + case 'S': + case 'T': + case 'U': + case 'V': + case 'W': + case 'X': + case 'Y': + case 'Z': + case '_': + case 'a': + case 'b': + case 'c': + case 'd': + case 'e': + case 'f': + case 'g': + case 'h': + case 'i': + case 'j': + case 'k': + case 'l': + case 'm': + case 'n': + case 'o': + case 'p': + case 'q': + case 'r': + case 's': + case 't': + case 'u': + case 'v': + case 'w': + case 'x': + case 'y': + case 'z': + p = buf; + while (buf++, is_in_name(*buf)) + ; + yylval.name = stalloc(buf - p + 1); + *(char *)mempcpy(yylval.name, p, buf - p) = 0; + value = ARITH_VAR; + goto out; + case '=': + value += ARITH_ASS - '='; +checkeq: + buf++; +checkeqcur: + if (*buf != '=') + goto out; + value += 11; + break; + case '>': + switch (*++buf) { + case '=': + value += ARITH_GE - '>'; + break; + case '>': + value += ARITH_RSHIFT - '>'; + goto checkeq; + default: + value += ARITH_GT - '>'; + goto out; + } + break; + case '<': + switch (*++buf) { + case '=': + value += ARITH_LE - '<'; + break; + case '<': + value += ARITH_LSHIFT - '<'; + goto checkeq; + default: + value += ARITH_LT - '<'; + goto out; + } + break; + case '|': + if (*++buf != '|') { + value += ARITH_BOR - '|'; + goto checkeqcur; + } + value += ARITH_OR - '|'; + break; + case '&': + if (*++buf != '&') { + value += ARITH_BAND - '&'; + goto checkeqcur; + } + value += ARITH_AND - '&'; + break; + case '!': + if (*++buf != '=') { + value += ARITH_NOT - '!'; + goto out; + } + value += ARITH_NE - '!'; + break; + case 0: + goto out; + case '(': + value += ARITH_LPAREN - '('; + break; + case ')': + value += ARITH_RPAREN - ')'; + break; + case '*': + value += ARITH_MUL - '*'; + goto checkeq; + case '/': + value += ARITH_DIV - '/'; + goto checkeq; + case '%': + value += ARITH_REM - '%'; + goto checkeq; + case '+': + value += ARITH_ADD - '+'; + goto checkeq; + case '-': + value += ARITH_SUB - '-'; + goto checkeq; + case '~': + value += ARITH_BNOT - '~'; + break; + case '^': + value += ARITH_BXOR - '^'; + goto checkeq; + case '?': + value += ARITH_QMARK - '?'; + break; + case ':': + value += ARITH_COLON - ':'; + break; + } + break; + } + + buf++; +out: + arith_buf = buf; + return value; +} |