cmd/rpcgen/rpc_scan.c

	rpc_scan.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 *
 * Copyright 2001 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */
/* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
/*
 * University Copyright- Copyright (c) 1982, 1986, 1988
 * The Regents of the University of California
 * All Rights Reserved
 *
 * University Acknowledgment- Portions of this document are derived from
 * software developed by the University of California, Berkeley, and its
 * contributors.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

/*
 * rpc_scan.c, Scanner for the RPC protocol compiler
 */

#include <sys/wait.h>
#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;
    int stat = 0;


    if (pushed) {
        pushed = 0;
        *tokp = lasttok;
        return;
    }
    commenting = 0;
    for (;;) {
        if (*where == 0) {
            for (;;) {
                if (!fgets(curline, MAXLINESIZE, fin)) {
                    tokp->kind = TOK_EOF;
                    /* now check if cpp returned non NULL value */
                    waitpid(childpid, &stat, WUNTRACED);
                    if (stat > 0) {
                    /* Set return value from rpcgen */
                        nonfatalerrors = stat >> 8;
                    }
                    *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_ONEWAY, "oneway"},
              {TOK_CHAR, "char"},
              {TOK_INT, "int"},
              {TOK_UNSIGNED, "unsigned"},
              {TOK_SHORT, "short"},
              {TOK_LONG, "long"},
              {TOK_HYPER, "hyper"},
              {TOK_FLOAT, "float"},
              {TOK_DOUBLE, "double"},
              {TOK_QUAD, "quadruple"},
              {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 = file = alloc(strlen(line) + 1);
    while (*line && *line != '"') {
        *p++ = *line++;
    }
    if (*line == 0) {
        error("preprocessor error");
    }
    *p = 0;
    if (*file == 0) {
        *fname = NULL;
    } else {
        *fname = file;
    }
    *lineno = num - 1;
}