Net2/usr/src/usr.bin/gas/app.c
/* This is the Assembler Pre-Processor
Copyright (C) 1987 Free Software Foundation, Inc.
This file is part of GAS, the GNU Assembler.
GAS is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 1, or (at your option)
any later version.
GAS is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GAS; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
/* App, the assembler pre-processor. This pre-processor strips out excess
spaces, turns single-quoted characters into a decimal constant, and turns
# <number> <filename> <garbage> into a .line <number>;.file <filename> pair.
This needs better error-handling.
*/
#include <stdio.h>
#ifdef USG
#define bzero(s,n) memset(s,0,n)
#endif
#if !defined(__STDC__) && !defined(const)
#define const /* Nothing */
#endif
static char lex [256];
static const char symbol_chars[] =
"$._ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
extern const char comment_chars[];
extern const char line_comment_chars[];
#define LEX_IS_SYMBOL_COMPONENT (1)
#define LEX_IS_WHITESPACE (2)
#define LEX_IS_LINE_SEPERATOR (4)
#define LEX_IS_COMMENT_START (8) /* JF added these two */
#define LEX_IS_LINE_COMMENT_START (16)
#define IS_SYMBOL_COMPONENT(c) (lex [c] & LEX_IS_SYMBOL_COMPONENT)
#define IS_WHITESPACE(c) (lex [c] & LEX_IS_WHITESPACE)
#define IS_LINE_SEPERATOR(c) (lex [c] & LEX_IS_LINE_SEPERATOR)
#define IS_COMMENT(c) (lex [c] & LEX_IS_COMMENT_START)
#define IS_LINE_COMMENT(c) (lex [c] & LEX_IS_LINE_COMMENT_START)
void
do_scrub_begin()
{
const char *p;
bzero (lex, sizeof(lex)); /* Trust NOBODY! */
lex [' '] |= LEX_IS_WHITESPACE;
lex ['\t'] |= LEX_IS_WHITESPACE;
for (p =symbol_chars;*p;++p)
lex [*p] |= LEX_IS_SYMBOL_COMPONENT;
lex ['\n'] |= LEX_IS_LINE_SEPERATOR;
#ifdef DONTDEF
lex [':'] |= LEX_IS_LINE_SEPERATOR;
#endif
lex [';'] |= LEX_IS_LINE_SEPERATOR;
for (p=comment_chars;*p;p++)
lex[*p] |= LEX_IS_COMMENT_START;
for (p=line_comment_chars;*p;p++)
lex[*p] |= LEX_IS_LINE_COMMENT_START;
}
FILE *scrub_file;
int
scrub_from_file()
{
return getc(scrub_file);
}
void
scrub_to_file(ch)
int ch;
{
ungetc(ch,scrub_file);
}
char *scrub_string;
char *scrub_last_string;
int
scrub_from_string()
{
return scrub_string == scrub_last_string ? EOF : *scrub_string++;
}
void
scrub_to_string(ch)
int ch;
{
*--scrub_string=ch;
}
int
do_scrub_next_char(get,unget)
int (*get)();
void (*unget)();
/* FILE *fp; */
{
/* State 0: beginning of normal line
1: After first whitespace on normal line (flush more white)
2: After first non-white on normal line (keep 1white)
3: after second white on normal line (flush white)
4: after putting out a .line, put out digits
5: parsing a string, then go to old-state
6: putting out \ escape in a "d string.
7: After putting out a .file, put out string.
8: After putting out a .file string, flush until newline.
-1: output string in out_string and go to the state in old_state
-2: flush text until a '*' '/' is seen, then go to state old_state
*/
static state;
static old_state;
static char *out_string;
static char out_buf[20];
static add_newlines;
int ch;
if(state==-1) {
ch= *out_string++;
if(*out_string==0) {
state=old_state;
old_state=3;
}
return ch;
}
if(state==-2) {
for(;;) {
do ch=(*get)();
while(ch!=EOF && ch!='\n' && ch!='*');
if(ch=='\n' || ch==EOF)
return ch;
ch=(*get)();
if(ch==EOF || ch=='/')
break;
(*unget)(ch);
}
state=old_state;
return ' ';
}
if(state==4) {
ch=(*get)();
if(ch==EOF || (ch>='0' && ch<='9'))
return ch;
else {
while(ch!=EOF && IS_WHITESPACE(ch))
ch=(*get)();
if(ch=='"') {
(*unget)(ch);
out_string="; .file ";
old_state=7;
state= -1;
return *out_string++;
} else {
while(ch!=EOF && ch!='\n')
ch=(*get)();
return ch;
}
}
}
if(state==5) {
ch=(*get)();
if(ch=='"') {
state=old_state;
return '"';
} else if(ch=='\\') {
state=6;
return ch;
} else if(ch==EOF) {
as_warn("End of file in string: inserted '\"'");
state=old_state;
(*unget)('\n');
return '"';
} else {
return ch;
}
}
if(state==6) {
state=5;
ch=(*get)();
switch(ch) {
/* This is neet. Turn "string
more string" into "string\n more string"
*/
case '\n':
(*unget)('n');
add_newlines++;
return '\\';
case '"':
case '\\':
case 'b':
case 'f':
case 'n':
case 'r':
case 't':
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
break;
default:
as_warn("Unknown escape '\\%c' in string: Ignored",ch);
break;
case EOF:
as_warn("End of file in string: '\"' inserted");
return '"';
}
return ch;
}
if(state==7) {
ch=(*get)();
state=5;
old_state=8;
return ch;
}
if(state==8) {
do ch= (*get)();
while(ch!='\n');
state=0;
return ch;
}
flushchar:
ch=(*get)();
switch(ch) {
case ' ':
case '\t':
do ch=(*get)();
while(ch!=EOF && IS_WHITESPACE(ch));
if(ch==EOF)
return ch;
if(IS_COMMENT(ch) || (state==0 && IS_LINE_COMMENT(ch)) || ch=='/' || IS_LINE_SEPERATOR(ch)) {
(*unget)(ch);
goto flushchar;
}
(*unget)(ch);
if(state==0 || state==2) {
state++;
return ' ';
} else goto flushchar;
case '/':
ch=(*get)();
if(ch=='*') {
for(;;) {
do {
ch=(*get)();
if(ch=='\n')
add_newlines++;
} while(ch!=EOF && ch!='*');
ch=(*get)();
if(ch==EOF || ch=='/')
break;
(*unget)(ch);
}
if(ch==EOF)
as_warn("End of file in '/' '*' string: */ inserted");
(*unget)(' ');
goto flushchar;
} else {
if(IS_COMMENT('/') || (state==0 && IS_LINE_COMMENT('/'))) {
(*unget)(ch);
ch='/';
goto deal_misc;
}
if(ch!=EOF)
(*unget)(ch);
return '/';
}
break;
case '"':
old_state=state;
state=5;
return '"';
break;
case '\'':
ch=(*get)();
if(ch==EOF) {
as_warn("End-of-file after a ': \000 inserted");
ch=0;
}
sprintf(out_buf,"(%d)",ch&0xff);
old_state=state;
state= -1;
out_string=out_buf;
return *out_string++;
case ':':
if(state!=3)
state=0;
return ch;
case '\n':
if(add_newlines) {
--add_newlines;
(*unget)(ch);
}
case ';':
state=0;
return ch;
default:
deal_misc:
if(state==0 && IS_LINE_COMMENT(ch)) {
do ch=(*get)();
while(ch!=EOF && IS_WHITESPACE(ch));
if(ch==EOF) {
as_warn("EOF in comment: Newline inserted");
return '\n';
}
if(ch<'0' || ch>'9') {
while(ch!=EOF && ch!='\n')
ch=(*get)();
if(ch==EOF)
as_warn("EOF in Comment: Newline inserted");
state=0;
return '\n';
}
(*unget)(ch);
old_state=4;
state= -1;
out_string=".line ";
return *out_string++;
} else if(IS_COMMENT(ch)) {
do ch=(*get)();
while(ch!=EOF && ch!='\n');
if(ch==EOF)
as_warn("EOF in comment: Newline inserted");
state=0;
return '\n';
} else if(state==0) {
state=2;
return ch;
} else if(state==1) {
state=2;
return ch;
} else {
return ch;
}
case EOF:
if(state==0)
return ch;
as_warn("End-of-File not at end of a line");
}
return -1;
}
#ifdef TEST
char comment_chars[] = "|";
char line_comment_chars[] = "#";
main()
{
int ch;
app_begin();
while((ch=do_scrub_next_char(stdin))!=EOF)
putc(ch,stdout);
}
as_warn(str)
char *str;
{
fputs(str,stderr);
putc('\n',stderr);
}
#endif