/* @(#)rpc_scan.c	1.1 87/11/04 3.9 RPCSRC */
/*
 * 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.
 * 
 * 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. 
 */

/* Portions Copyright (c) 2003 Apple Computer, Inc. */
#include <afsconfig.h>
#include <afs/param.h>


#include <stdio.h>
#include <stdlib.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] == '/')
#define	verbatimstart(p) (*(p) == '@' && *((p) + 1) == '{')
#define	verbatimend(p)	(*(p) == '@' && *((p) + 1) == '}')

int pushed = 0;			/* is a token pushed */
token lasttok;			/* last token, if pushed */
int scan_print = 1;

/* static prototypes */
static void findstrconst(char **str, char **val);
static void findconst(char **str, char **val);
static int cppline(char *line);
static int directive(char *line);
static void docppline(char *line, int *lineno, char **fname);
#ifdef undef
static void deverbatim(void);
#endif


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

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

/*
 * scan expecting 3 given token 
 */
void
scan3(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 4 given token
 */
void
scan4(tok_kind expect1, tok_kind expect2, tok_kind expect3, tok_kind expect4,
      token * tokp)
{
    get_token(tokp);
    if (tokp->kind != expect1 && tokp->kind != expect2
	&& tokp->kind != expect3 && tokp->kind != expect4) {
	expected4(expect1, expect2, expect3, expect4);
    }
}

/*
 * scan expecting a constant, possibly symbolic 
 */
void
scan_num(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(token * tokp)
{
    get_token(tokp);
    unget_token(tokp);
}


/*
 * Peek at the next token and scan it if it matches what you expect 
 */
int
peekscan(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(token * tokp)
{
    int commenting;
    int verbatim = 0;

    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 (verbatim) {
		    fputs(curline, fout);
		    break;
		}
		if (commenting) {
		    break;
		} else if (cppline(curline)) {
#if defined(AFS_DARWIN_ENV)
		    if (strncmp(curline, "#pragma", 7) == 0)
		        continue;
#endif /* defined(AFS_DARWIN_ENV) */
		    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 (verbatim) {
	    where++;
	    if (verbatimend(where)) {
		where++;
		verbatim--;
	    }
	} else if (verbatimstart(where)) {
	    where += 2;
	    verbatim++;
	} else if (commenting) {
	    where++;
	    if (endcomment(where)) {
		where++;
		commenting--;
	    }
	} 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 '-':
    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;
    }
}


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


static void
findstrconst(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 void
findconst(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_INT32, "afs_int32"},
    {TOK_FLOAT, "float"},
    {TOK_DOUBLE, "double"},
    {TOK_STRING, "string"},
    {TOK_PROGRAM, "program"},
    {TOK_VERSION, "version"},
    {TOK_PACKAGE, "package"},
    {TOK_PREFIX, "prefix"},
    {TOK_STATINDEX, "statindex"},
    {TOK_SPECIAL, "special"},
    {TOK_STARTINGOPCODE, "startingopcode"},
    {TOK_CUSTOMIZED, "customized"},
    {TOK_PROC, "proc"},
    {TOK_SPLITPREFIX, "splitprefix"},
    {TOK_SPLIT, "split"},
    {TOK_MULTI, "multi"},
    {TOK_IN, "IN"},
    {TOK_OUT, "OUT"},
    {TOK_INOUT, "INOUT"},
    {TOK_AFSUUID, "afsUUID"},
    {TOK_EOF, "??????"},
};


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

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

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

static void
docppline(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++;
    }
#ifdef	AFS_HPUX_ENV
    if (*line == '\0') {
	*fname = NULL;
	*lineno = num - 1;
	return;
    }
#endif
    if (*line != '"') {
#ifdef	AFS_AIX41_ENV
	if (!strncmp(line, "line", 4)) {
	    while (*line)
		*line++;
	    *fname = NULL;
	    *lineno = num - 1;
	    return;
	}
#endif
	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;
}


#ifdef undef
/* doesn't appear to be used */
static void
deverbatim(void)
{
    for (where += 2; !verbatimend(where); where++) {
	if (*where == 0) {
	    if (!fgets(curline, MAXLINESIZE, fin)) {
		error("unterminated code: %} is missing");
	    }
	    linenum++;
	    where = curline - 1;
	    if (verbatimend(curline)) {
		where++;
		break;
	    }
	    fputs(curline, fout);
	}
    }
    where += 2;
}
#endif
