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BSD 4_3_Net_2 release
[unix-history] / usr / src / lib / librpc / rpcgen / rpc_scan.c
/* @(#)rpc_scan.c 2.1 88/08/01 4.0 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
*/
#ifndef lint
static char sccsid[] = "@(#)rpc_scan.c 1.6 87/06/24 (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 <strings.h>
#include "rpc_scan.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 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 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) {
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;
}
}
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
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 = 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;
}
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.