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Add the source code for /usr/src/usr.bin from the Net/2 tape
[unix-history] / usr / src / usr.bin / window / scanner.c
/*
* Copyright (c) 1983 Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Edward Wang at The University of California, Berkeley.
*
* 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[] = "@(#)scanner.c 3.14 (Berkeley) 6/6/90";
#endif /* not lint */
#include "value.h"
#include "token.h"
#include "context.h"
#include "string.h"
s_getc()
{
register c;
switch (cx.x_type) {
case X_FILE:
c = getc(cx.x_fp);
if (cx.x_bol && c != EOF) {
cx.x_bol = 0;
cx.x_lineno++;
}
if (c == '\n')
cx.x_bol = 1;
return c;
case X_BUF:
if (*cx.x_bufp != 0)
return *cx.x_bufp++ & 0xff;
else
return EOF;
}
/*NOTREACHED*/
}
s_ungetc(c)
{
if (c == EOF)
return EOF;
switch (cx.x_type) {
case X_FILE:
cx.x_bol = 0;
return ungetc(c, cx.x_fp);
case X_BUF:
if (cx.x_bufp > cx.x_buf)
return *--cx.x_bufp = c;
else
return EOF;
}
/*NOTREACHED*/
}
s_gettok()
{
char buf[100];
register char *p = buf;
register c;
register state = 0;
loop:
c = s_getc();
switch (state) {
case 0:
switch (c) {
case ' ':
case '\t':
break;
case '\n':
case ';':
cx.x_token = T_EOL;
state = -1;
break;
case '#':
state = 1;
break;
case EOF:
cx.x_token = T_EOF;
state = -1;
break;
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 '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 '.':
*p++ = c;
state = 2;
break;
case '"':
state = 3;
break;
case '\'':
state = 4;
break;
case '\\':
switch (c = s_gettok1()) {
case -1:
break;
case -2:
state = 0;
break;
default:
*p++ = c;
state = 2;
}
break;
case '0':
cx.x_val.v_num = 0;
state = 10;
break;
case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
cx.x_val.v_num = c - '0';
state = 11;
break;
case '>':
state = 20;
break;
case '<':
state = 21;
break;
case '=':
state = 22;
break;
case '!':
state = 23;
break;
case '&':
state = 24;
break;
case '|':
state = 25;
break;
case '$':
state = 26;
break;
case '~':
cx.x_token = T_COMP;
state = -1;
break;
case '+':
cx.x_token = T_PLUS;
state = -1;
break;
case '-':
cx.x_token = T_MINUS;
state = -1;
break;
case '*':
cx.x_token = T_MUL;
state = -1;
break;
case '/':
cx.x_token = T_DIV;
state = -1;
break;
case '%':
cx.x_token = T_MOD;
state = -1;
break;
case '^':
cx.x_token = T_XOR;
state = -1;
break;
case '(':
cx.x_token = T_LP;
state = -1;
break;
case ')':
cx.x_token = T_RP;
state = -1;
break;
case ',':
cx.x_token = T_COMMA;
state = -1;
break;
case '?':
cx.x_token = T_QUEST;
state = -1;
break;
case ':':
cx.x_token = T_COLON;
state = -1;
break;
case '[':
cx.x_token = T_LB;
state = -1;
break;
case ']':
cx.x_token = T_RB;
state = -1;
break;
default:
cx.x_val.v_num = c;
cx.x_token = T_CHAR;
state = -1;
break;
}
break;
case 1: /* got # */
if (c == '\n' || c == EOF) {
(void) s_ungetc(c);
state = 0;
}
break;
case 2: /* unquoted string */
switch (c) {
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 '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 '.':
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
if (p < buf + sizeof buf - 1)
*p++ = c;
break;
case '"':
state = 3;
break;
case '\'':
state = 4;
break;
case '\\':
switch (c = s_gettok1()) {
case -2:
(void) s_ungetc(' ');
case -1:
break;
default:
if (p < buf + sizeof buf - 1)
*p++ = c;
}
break;
default:
(void) s_ungetc(c);
case EOF:
*p = 0;
cx.x_token = T_STR;
switch (*buf) {
case 'i':
if (buf[1] == 'f' && buf[2] == 0)
cx.x_token = T_IF;
break;
case 't':
if (buf[1] == 'h' && buf[2] == 'e'
&& buf[3] == 'n' && buf[4] == 0)
cx.x_token = T_THEN;
break;
case 'e':
if (buf[1] == 'n' && buf[2] == 'd'
&& buf[3] == 'i' && buf[4] == 'f'
&& buf[5] == 0)
cx.x_token = T_ENDIF;
else if (buf[1] == 'l' && buf[2] == 's')
if (buf[3] == 'i' && buf[4] == 'f'
&& buf[5] == 0)
cx.x_token = T_ELSIF;
else if (buf[3] == 'e' && buf[4] == 0)
cx.x_token = T_ELSE;
break;
}
if (cx.x_token == T_STR
&& (cx.x_val.v_str = str_cpy(buf)) == 0) {
p_memerror();
cx.x_token = T_EOF;
}
state = -1;
break;
}
break;
case 3: /* " quoted string */
switch (c) {
case '\n':
(void) s_ungetc(c);
case EOF:
case '"':
state = 2;
break;
case '\\':
switch (c = s_gettok1()) {
case -1:
case -2: /* newlines are invisible */
break;
default:
if (p < buf + sizeof buf - 1)
*p++ = c;
}
break;
default:
if (p < buf + sizeof buf - 1)
*p++ = c;
break;
}
break;
case 4: /* ' quoted string */
switch (c) {
case '\n':
(void) s_ungetc(c);
case EOF:
case '\'':
state = 2;
break;
case '\\':
switch (c = s_gettok1()) {
case -1:
case -2: /* newlines are invisible */
break;
default:
if (p < buf + sizeof buf - 1)
*p++ = c;
}
break;
default:
if (p < buf + sizeof buf - 1)
*p++ = c;
break;
}
break;
case 10: /* got 0 */
switch (c) {
case 'x':
case 'X':
cx.x_val.v_num = 0;
state = 12;
break;
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7':
cx.x_val.v_num = c - '0';
state = 13;
break;
case '8': case '9':
cx.x_val.v_num = c - '0';
state = 11;
break;
default:
(void) s_ungetc(c);
state = -1;
cx.x_token = T_NUM;
}
break;
case 11: /* decimal number */
switch (c) {
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
cx.x_val.v_num = cx.x_val.v_num * 10 + c - '0';
break;
default:
(void) s_ungetc(c);
state = -1;
cx.x_token = T_NUM;
}
break;
case 12: /* hex number */
switch (c) {
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
cx.x_val.v_num = cx.x_val.v_num * 16 + c - '0';
break;
case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
cx.x_val.v_num = cx.x_val.v_num * 16 + c - 'a' + 10;
break;
case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
cx.x_val.v_num = cx.x_val.v_num * 16 + c - 'A' + 10;
break;
default:
(void) s_ungetc(c);
state = -1;
cx.x_token = T_NUM;
}
break;
case 13: /* octal number */
switch (c) {
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7':
cx.x_val.v_num = cx.x_val.v_num * 8 + c - '0';
break;
default:
(void) s_ungetc(c);
state = -1;
cx.x_token = T_NUM;
}
break;
case 20: /* got > */
switch (c) {
case '=':
cx.x_token = T_GE;
state = -1;
break;
case '>':
cx.x_token = T_RS;
state = -1;
break;
default:
(void) s_ungetc(c);
cx.x_token = T_GT;
state = -1;
}
break;
case 21: /* got < */
switch (c) {
case '=':
cx.x_token = T_LE;
state = -1;
break;
case '<':
cx.x_token = T_LS;
state = -1;
break;
default:
(void) s_ungetc(c);
cx.x_token = T_LT;
state = -1;
}
break;
case 22: /* got = */
switch (c) {
case '=':
cx.x_token = T_EQ;
state = -1;
break;
default:
(void) s_ungetc(c);
cx.x_token = T_ASSIGN;
state = -1;
}
break;
case 23: /* got ! */
switch (c) {
case '=':
cx.x_token = T_NE;
state = -1;
break;
default:
(void) s_ungetc(c);
cx.x_token = T_NOT;
state = -1;
}
break;
case 24: /* got & */
switch (c) {
case '&':
cx.x_token = T_ANDAND;
state = -1;
break;
default:
(void) s_ungetc(c);
cx.x_token = T_AND;
state = -1;
}
break;
case 25: /* got | */
switch (c) {
case '|':
cx.x_token = T_OROR;
state = -1;
break;
default:
(void) s_ungetc(c);
cx.x_token = T_OR;
state = -1;
}
break;
case 26: /* got $ */
switch (c) {
case '?':
cx.x_token = T_DQ;
state = -1;
break;
default:
(void) s_ungetc(c);
cx.x_token = T_DOLLAR;
state = -1;
}
break;
default:
abort();
}
if (state >= 0)
goto loop;
return cx.x_token;
}
s_gettok1()
{
register c;
register n;
c = s_getc(); /* got \ */
switch (c) {
case EOF:
return -1;
case '\n':
return -2;
case 'b':
return '\b';
case 'f':
return '\f';
case 'n':
return '\n';
case 'r':
return '\r';
case 't':
return '\t';
default:
return c;
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7':
break;
}
n = c - '0';
c = s_getc(); /* got \[0-7] */
if (c < '0' || c > '7') {
(void) s_ungetc(c);
return n;
}
n = n * 8 + c - '0';
c = s_getc(); /* got \[0-7][0-7] */
if (c < '0' || c > '7') {
(void) s_ungetc(c);
return n;
}
return n * 8 + c - '0';
}
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.