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rcsid[] and sccsid[] and copyright[] are essentially unmaintained (and
unmaintainable).  these days, people use source.  these id's do not provide
any benefit, and do hurt the small install media
(the 33,000 line diff is essentially mechanical)
ok with the idea millert, ok dms

/*	$OpenBSD: rpc_scan.c,v 1.14 2009/10/27 23:59:42 deraadt Exp $	*/
/*	$NetBSD: rpc_scan.c,v 1.4 1995/06/11 21:50:02 pk Exp $	*/
/*
 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
 * unrestricted use provided that this legend is included on all tape
 * media and as a part of the software program in whole or part.  Users
 * may copy or modify Sun RPC without charge, but are not authorized
 * to license or distribute it to anyone else except as part of a product or
 * program developed by the user or with the express written consent of
 * Sun Microsystems, Inc.
 *
 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
 *
 * Sun RPC is provided with no support and without any obligation on the
 * part of Sun Microsystems, Inc. to assist in its use, correction,
 * modification or enhancement.
 *
 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
 * OR ANY PART THEREOF.
 *
 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
 * or profits or other special, indirect and consequential damages, even if
 * Sun has been advised of the possibility of such damages.
 *
 * Sun Microsystems, Inc.
 * 2550 Garcia Avenue
 * Mountain View, California  94043
 */

/*
 * rpc_scan.c, Scanner for the RPC protocol compiler
 * Copyright (C) 1987, Sun Microsystems, Inc.
 */
#include <sys/cdefs.h>
#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include "rpc_scan.h"
#include "rpc_parse.h"
#include "rpc_util.h"

static void unget_token(token *tokp);
static void findstrconst(char **, char **);
static void findchrconst(char **, char **);
static void findconst(char **, char **);
static void findkind(char **, token *);
static int cppline(char *);
static int directive(char *);
static void printdirective(char *);
static void docppline(char *, int *, char **);

#define startcomment(where) (where[0] == '/' && where[1] == '*')
#define endcomment(where) (where[-1] == '*' && where[0] == '/')

static int pushed = 0;	/* is a token pushed */
static token lasttok;	/* last token, if pushed */

/*
 * scan expecting 1 given token
 */
void
scan(expect, tokp)
	tok_kind expect;
	token *tokp;
{
	get_token(tokp);
	if (tokp->kind != expect)
		expected1(expect);
}

/*
 * scan expecting any of the 2 given tokens
 */
void
scan2(expect1, expect2, tokp)
	tok_kind expect1;
	tok_kind expect2;
	token *tokp;
{
	get_token(tokp);
	if (tokp->kind != expect1 && tokp->kind != expect2)
		expected2(expect1, expect2);
}

/*
 * scan expecting any of the 3 given token
 */
void
scan3(expect1, expect2, expect3, tokp)
	tok_kind expect1;
	tok_kind expect2;
	tok_kind expect3;
	token *tokp;
{
	get_token(tokp);
	if (tokp->kind != expect1 && tokp->kind != expect2 &&
	    tokp->kind != expect3)
		expected3(expect1, expect2, expect3);
}

/*
 * scan expecting a constant, possibly symbolic
 */
void
scan_num(tokp)
	token *tokp;
{
	get_token(tokp);
	switch (tokp->kind) {
	case TOK_IDENT:
		break;
	default:
		error("constant or identifier expected");
	}
}

/*
 * Peek at the next token
 */
void
peek(tokp)
	token *tokp;
{
	get_token(tokp);
	unget_token(tokp);
}

/*
 * Peek at the next token and scan it if it matches what you expect
 */
int
peekscan(expect, tokp)
	tok_kind expect;
	token *tokp;
{
	peek(tokp);
	if (tokp->kind == expect) {
		get_token(tokp);
		return (1);
	}
	return (0);
}

/*
 * Get the next token, printing out any directive that are encountered.
 */
void
get_token(tokp)
	token *tokp;
{
	int commenting;

	if (pushed) {
		pushed = 0;
		*tokp = lasttok;
		return;
	}
	commenting = 0;
	for (;;) {
		if (*where == 0) {
			for (;;) {
				if (!fgets(curline, MAXLINESIZE, fin)) {
					tokp->kind = TOK_EOF;
					*where = 0;
					return;
				}
				linenum++;
				if (commenting) {
					break;
				} else if (cppline(curline)) {
					docppline(curline, &linenum,
					    &infilename);
				} else if (directive(curline)) {
					printdirective(curline);
				} else {
					break;
				}
			}
			where = curline;
		} else if (isspace(*where)) {
			while (isspace(*where)) {
				where++;	/* eat */
			}
		} else if (commenting) {
			for (where++; *where; where++) {
				if (endcomment(where)) {
					where++;
					commenting--;
					break;
				}
			}
		} else if (startcomment(where)) {
			where += 2;
			commenting++;
		} else {
			break;
		}
	}

	/*
	 * 'where' is not whitespace, comment or directive Must be a token!
	 */
	switch (*where) {
	case ':':
		tokp->kind = TOK_COLON;
		where++;
		break;
	case ';':
		tokp->kind = TOK_SEMICOLON;
		where++;
		break;
	case ',':
		tokp->kind = TOK_COMMA;
		where++;
		break;
	case '=':
		tokp->kind = TOK_EQUAL;
		where++;
		break;
	case '*':
		tokp->kind = TOK_STAR;
		where++;
		break;
	case '[':
		tokp->kind = TOK_LBRACKET;
		where++;
		break;
	case ']':
		tokp->kind = TOK_RBRACKET;
		where++;
		break;
	case '{':
		tokp->kind = TOK_LBRACE;
		where++;
		break;
	case '}':
		tokp->kind = TOK_RBRACE;
		where++;
		break;
	case '(':
		tokp->kind = TOK_LPAREN;
		where++;
		break;
	case ')':
		tokp->kind = TOK_RPAREN;
		where++;
		break;
	case '<':
		tokp->kind = TOK_LANGLE;
		where++;
		break;
	case '>':
		tokp->kind = TOK_RANGLE;
		where++;
		break;

	case '"':
		tokp->kind = TOK_STRCONST;
		findstrconst(&where, &tokp->str);
		break;
	case '\'':
		tokp->kind = TOK_CHARCONST;
		findchrconst(&where, &tokp->str);
		break;

	case '-':
	case '0':
	case '1':
	case '2':
	case '3':
	case '4':
	case '5':
	case '6':
	case '7':
	case '8':
	case '9':
		tokp->kind = TOK_IDENT;
		findconst(&where, &tokp->str);
		break;

	default:
		if (!(isalpha(*where) || *where == '_')) {
			char buf[100], chs[20];

			if (isprint(*where)) {
				snprintf(chs, sizeof chs, "%c", *where);
			} else {
				snprintf(chs, sizeof chs, "%d", *where);
			}

			snprintf(buf, sizeof buf,
			    "illegal character in file: %s", chs);
			error(buf);
		}
		findkind(&where, tokp);
		break;
	}
}

static void
unget_token(tokp)
	token *tokp;
{
	lasttok = *tokp;
	pushed = 1;
}

static void
findstrconst(str, val)
	char **str;
	char **val;
{
	char *p;
	int size;

	p = *str;
	do {
		p++;
	} while (*p && *p != '"');
	if (*p == 0) {
		error("unterminated string constant");
	}
	p++;
	size = p - *str;
	*val = alloc(size + 1);
	if (val == NULL)
		error("alloc failed");
	(void) strncpy(*val, *str, size);
	(*val)[size] = 0;
	*str = p;
}

static void
findchrconst(str, val)
	char **str;
	char **val;
{
	char *p;
	int size;

	p = *str;
	do {
		p++;
	} while (*p && *p != '\'');
	if (*p == 0) {
		error("unterminated string constant");
	}
	p++;
	size = p - *str;
	if (size != 3) {
		error("empty char string");
	}
	*val = alloc(size + 1);
	if (val == NULL)
		error("alloc failed");
	(void) strncpy(*val, *str, size);
	(*val)[size] = 0;
	*str = p;
}

static void
findconst(str, val)
	char **str;
	char **val;
{
	char *p;
	int size;

	p = *str;
	if (*p == '0' && *(p + 1) == 'x') {
		p++;
		do {
			p++;
		} while (isxdigit(*p));
	} else {
		do {
			p++;
		} while (isdigit(*p));
	}
	size = p - *str;
	*val = alloc(size + 1);
	if (val == NULL)
		error("alloc failed");
	(void) strncpy(*val, *str, size);
	(*val)[size] = 0;
	*str = p;
}

static token symbols[] = {
	{TOK_CONST, "const"},
	{TOK_UNION, "union"},
	{TOK_SWITCH, "switch"},
	{TOK_CASE, "case"},
	{TOK_DEFAULT, "default"},
	{TOK_STRUCT, "struct"},
	{TOK_TYPEDEF, "typedef"},
	{TOK_ENUM, "enum"},
	{TOK_OPAQUE, "opaque"},
	{TOK_BOOL, "bool"},
	{TOK_VOID, "void"},
	{TOK_CHAR, "char"},
	{TOK_INT, "int"},
	{TOK_UNSIGNED, "unsigned"},
	{TOK_SHORT, "short"},
	{TOK_LONG, "long"},
	{TOK_FLOAT, "float"},
	{TOK_DOUBLE, "double"},
	{TOK_STRING, "string"},
	{TOK_PROGRAM, "program"},
	{TOK_VERSION, "version"},
	{TOK_EOF, "??????"},
};

static void
findkind(mark, tokp)
	char **mark;
	token *tokp;
{
	int len;
	token *s;
	char *str;

	str = *mark;
	for (s = symbols; s->kind != TOK_EOF; s++) {
		len = strlen(s->str);
		if (strncmp(str, s->str, len) == 0) {
			if (!isalnum(str[len]) && str[len] != '_') {
				tokp->kind = s->kind;
				tokp->str = s->str;
				*mark = str + len;
				return;
			}
		}
	}
	tokp->kind = TOK_IDENT;
	for (len = 0; isalnum(str[len]) || str[len] == '_'; len++);
	tokp->str = alloc(len + 1);
	if (tokp->str == NULL)
		error("alloc failed");
	(void) strncpy(tokp->str, str, len);
	tokp->str[len] = 0;
	*mark = str + len;
}

static int
cppline(line)
	char *line;
{
	return (line == curline && *line == '#');
}

static int
directive(line)
	char *line;
{
	return (line == curline && *line == '%');
}

static void
printdirective(line)
	char *line;
{
	fprintf(fout, "%s", line + 1);
}

static void
docppline(line, lineno, fname)
	char *line;
	int *lineno;
	char **fname;
{
	char *file;
	int num;
	char *p;

	line++;
	while (isspace(*line)) {
		line++;
	}
	num = atoi(line);
	while (isdigit(*line)) {
		line++;
	}
	while (isspace(*line)) {
		line++;
	}
	if (*line != '"') {
		error("preprocessor error");
	}
	line++;
	p = file = alloc(strlen(line) + 1);
	if (p == NULL)
		error("alloc failed");
	while (*line && *line != '"') {
		*p++ = *line++;
	}
	if (*line == 0) {
		error("preprocessor error");
	}
	*p = 0;
	if (*file == 0) {
		*fname = NULL;
		free(file);
	} else {
		*fname = file;
	}
	*lineno = num - 1;
}