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/*
 * 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
 */

#ifndef lint
static char sccsid[] = "@(#)rpc_scan.c 1.11 89/02/22 (C) 1987 SMI";
#endif

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

#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];
                        char *p;

                        s_print(buf, "illegal character in file: ");
                        p = buf + strlen(buf);
                        if (isprint(*where)) {
                                s_print(p, "%c", *where);
                        } else {
                                s_print(p, "%d", *where);
                        }
                        error(buf);
                }
                findkind(&where, tokp);
                break;
        }
}

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

static
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);
        (void) strncpy(*val, *str, size);
        (*val)[size] = 0;
        *str = p;
}

static
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);
        (void) strncpy(*val, *str, size);
        (*val)[size] = 0;
        *str = p;
}

static
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);
        (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
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);
        (void) strncpy(tokp->str, str, len);
        tokp->str[len] = 0;
        *mark = str + len;
}

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

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

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

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