346 lines
6.4 KiB
C
346 lines
6.4 KiB
C
/*-
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* SPDX-License-Identifier: MIT-CMU
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*
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* Mach Operating System
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* Copyright (c) 1991,1990 Carnegie Mellon University
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* All Rights Reserved.
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*
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* Permission to use, copy, modify and distribute this software and its
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* documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
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* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*/
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/*
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* Author: David B. Golub, Carnegie Mellon University
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* Date: 7/90
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*/
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/*
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* Lexical analyzer.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/libkern.h>
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#include <ddb/ddb.h>
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#include <ddb/db_lex.h>
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static char db_line[DB_MAXLINE];
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static char * db_lp, *db_endlp;
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static int db_lex(void);
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static void db_flush_line(void);
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static int db_read_char(void);
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static void db_unread_char(int);
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int
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db_read_line(void)
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{
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int i;
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i = db_readline(db_line, sizeof(db_line));
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if (i == 0)
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return (0); /* EOI */
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db_lp = db_line;
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db_endlp = db_lp + i;
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return (i);
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}
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/*
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* Simulate a line of input into DDB.
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*/
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void
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db_inject_line(const char *command)
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{
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strlcpy(db_line, command, sizeof(db_line));
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db_lp = db_line;
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db_endlp = db_lp + strlen(command);
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}
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/*
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* In rare cases, we may want to pull the remainder of the line input
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* verbatim, rather than lexing it. For example, when assigning literal
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* values associated with scripts. In that case, return a static pointer to
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* the current location in the input buffer. The caller must be aware that
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* the contents are not stable if other lex/input calls are made.
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*/
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char *
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db_get_line(void)
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{
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return (db_lp);
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}
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static void
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db_flush_line()
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{
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db_lp = db_line;
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db_endlp = db_line;
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}
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static int db_look_char = 0;
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static int
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db_read_char(void)
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{
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int c;
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if (db_look_char != 0) {
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c = db_look_char;
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db_look_char = 0;
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}
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else if (db_lp >= db_endlp)
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c = -1;
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else
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c = *db_lp++;
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return (c);
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}
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static void
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db_unread_char(c)
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int c;
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{
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db_look_char = c;
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}
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static int db_look_token = 0;
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void
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db_unread_token(t)
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int t;
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{
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db_look_token = t;
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}
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int
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db_read_token()
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{
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int t;
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if (db_look_token) {
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t = db_look_token;
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db_look_token = 0;
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}
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else
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t = db_lex();
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return (t);
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}
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db_expr_t db_tok_number;
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char db_tok_string[TOK_STRING_SIZE];
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db_expr_t db_radix = 16;
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void
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db_flush_lex(void)
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{
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db_flush_line();
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db_look_char = 0;
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db_look_token = 0;
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}
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static int
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db_lex(void)
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{
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int c;
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c = db_read_char();
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while (c <= ' ' || c > '~') {
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if (c == '\n' || c == -1)
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return (tEOL);
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c = db_read_char();
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}
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if (c >= '0' && c <= '9') {
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/* number */
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int r, digit = 0;
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if (c > '0')
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r = db_radix;
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else {
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c = db_read_char();
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if (c == 'O' || c == 'o')
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r = 8;
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else if (c == 'T' || c == 't')
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r = 10;
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else if (c == 'X' || c == 'x')
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r = 16;
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else {
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r = db_radix;
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db_unread_char(c);
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}
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c = db_read_char();
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}
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db_tok_number = 0;
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for (;;) {
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if (c >= '0' && c <= ((r == 8) ? '7' : '9'))
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digit = c - '0';
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else if (r == 16 && ((c >= 'A' && c <= 'F') ||
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(c >= 'a' && c <= 'f'))) {
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if (c >= 'a')
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digit = c - 'a' + 10;
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else if (c >= 'A')
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digit = c - 'A' + 10;
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}
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else
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break;
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db_tok_number = db_tok_number * r + digit;
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c = db_read_char();
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}
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if ((c >= '0' && c <= '9') ||
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(c >= 'A' && c <= 'Z') ||
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(c >= 'a' && c <= 'z') ||
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(c == '_'))
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{
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db_error("Bad character in number\n");
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db_flush_lex();
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return (tEOF);
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}
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db_unread_char(c);
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return (tNUMBER);
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}
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if ((c >= 'A' && c <= 'Z') ||
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(c >= 'a' && c <= 'z') ||
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c == '_' || c == '\\')
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{
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/* string */
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char *cp;
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cp = db_tok_string;
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if (c == '\\') {
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c = db_read_char();
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if (c == '\n' || c == -1)
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db_error("Bad escape\n");
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}
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*cp++ = c;
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while (1) {
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c = db_read_char();
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if ((c >= 'A' && c <= 'Z') ||
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(c >= 'a' && c <= 'z') ||
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(c >= '0' && c <= '9') ||
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c == '_' || c == '\\' || c == ':' || c == '.')
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{
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if (c == '\\') {
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c = db_read_char();
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if (c == '\n' || c == -1)
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db_error("Bad escape\n");
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}
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*cp++ = c;
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if (cp == db_tok_string+sizeof(db_tok_string)) {
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db_error("String too long\n");
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db_flush_lex();
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return (tEOF);
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}
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continue;
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}
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else {
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*cp = '\0';
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break;
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}
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}
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db_unread_char(c);
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return (tIDENT);
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}
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switch (c) {
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case '+':
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return (tPLUS);
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case '-':
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return (tMINUS);
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case '.':
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c = db_read_char();
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if (c == '.')
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return (tDOTDOT);
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db_unread_char(c);
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return (tDOT);
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case '*':
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return (tSTAR);
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case '/':
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return (tSLASH);
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case '=':
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c = db_read_char();
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if (c == '=')
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return (tLOG_EQ);
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db_unread_char(c);
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return (tEQ);
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case '%':
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return (tPCT);
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case '#':
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return (tHASH);
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case '(':
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return (tLPAREN);
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case ')':
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return (tRPAREN);
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case ',':
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return (tCOMMA);
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case '"':
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return (tDITTO);
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case '$':
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return (tDOLLAR);
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case '!':
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c = db_read_char();
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if (c == '='){
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return (tLOG_NOT_EQ);
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}
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db_unread_char(c);
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return (tEXCL);
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case ';':
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return (tSEMI);
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case '&':
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c = db_read_char();
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if (c == '&')
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return (tLOG_AND);
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db_unread_char(c);
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return (tBIT_AND);
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case '|':
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c = db_read_char();
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if (c == '|')
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return (tLOG_OR);
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db_unread_char(c);
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return (tBIT_OR);
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case '<':
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c = db_read_char();
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if (c == '<')
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return (tSHIFT_L);
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if (c == '=')
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return (tLESS_EQ);
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db_unread_char(c);
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return (tLESS);
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case '>':
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c = db_read_char();
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if (c == '>')
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return (tSHIFT_R);
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if (c == '=')
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return (tGREATER_EQ);
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db_unread_char(c);
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return (tGREATER);
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case '?':
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return (tQUESTION);
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case '~':
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return (tBIT_NOT);
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case -1:
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return (tEOF);
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}
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db_printf("Bad character\n");
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db_flush_lex();
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return (tEOF);
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}
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