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- /* 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()
- {
- #ifdef atarist
- int c;
- if((c = getc(scrub_file)) == '\r') c = getc(scrub_file);
- return c;
- #else
- return getc(scrub_file);
- #endif
- }
-
- 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
-