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/*
* This file contains functions used to initialize the preprocessor,
* particularly those for establishing implementation-dependent standard
* macro definitions.
*/
#include "../preproc/preproc.h"
#include "../preproc/ptoken.h"
#include "../preproc/pproto.h"
static void define_opt (char *s, int len, struct token *dflt);
static void do_directive (char *s);
static void mac_opts (char *opt_lst, char **opt_args);
static void undef_opt (char *s, int len);
struct src dummy;
/*
* init_preproc - initialize all parts of the preprocessor, establishing
* the primary file as the current source of tokens.
*/
void init_preproc(fname, opt_lst, opt_args)
char *fname;
char *opt_lst;
char **opt_args;
{
init_str(); /* initialize string table */
init_tok(); /* initialize tokenizer */
init_macro(); /* initialize macro table */
init_files(opt_lst, opt_args); /* initialize standard header locations */
dummy.flag = DummySrc; /* marker at bottom of source stack */
dummy.ntoks = 0;
src_stack = &dummy;
mac_opts(opt_lst, opt_args); /* process options for predefined macros */
source(fname); /* establish primary source file */
}
/*
* mac_opts - handle options which affect what predefined macros are in
* effect when preprocessing starts. The options may be on the command
* line. Also establish predefined macros.
*/
static void mac_opts(opt_lst, opt_args)
char *opt_lst;
char **opt_args;
{
int i;
/*
* Establish predefined macros.
*/
#if CYGWIN
do_directive("#define __CYGWIN32__\n");
do_directive("#define __CYGWIN__\n");
do_directive("#define __unix__\n");
do_directive("#define __unix\n");
do_directive("#define _WIN32\n");
do_directive("#define __WIN32\n");
do_directive("#define __WIN32__\n");
#else /* CYGWIN */
do_directive("#define unix 1\n");
do_directive(PPInit); /* defines that vary between Unix systems */
#endif /* CYGWIN*/
/*
* look for options that affect macro definitions (-U, -D, etc).
*/
for (i = 0; opt_lst[i] != '\0'; ++i)
switch(opt_lst[i]) {
case 'U':
/*
* Undefine and predefined identifier.
*/
undef_opt(opt_args[i], (int)strlen(opt_args[i]));
break;
case 'D':
/*
* Define an identifier. Use "1" if no defining string is given.
*/
define_opt(opt_args[i], (int)strlen(opt_args[i]), one_tok);
break;
}
}
/*
* str_src - establish a string, given by a character pointer and a length,
* as the current source of tokens.
*/
void str_src(src_name, s, len)
char *src_name;
char *s;
int len;
{
union src_ref ref;
int *ip1, *ip2;
/*
* Create a character source with a large enought buffer for the string.
*/
ref.cs = new_cs(src_name, NULL, len + 1);
push_src(CharSrc, &ref);
ip1 = ref.cs->char_buf;
ip2 = ref.cs->line_buf;
while (len-- > 0) {
*ip1++ = *s++; /* copy string to source buffer */
*ip2++ = 0; /* characters are from "line 0" */
}
*ip1 = EOF;
*ip2 = 0;
ref.cs->next_char = ref.cs->char_buf;
ref.cs->last_char = ip1;
first_char = ref.cs->char_buf;
next_char = first_char;
last_char = ref.cs->last_char;
}
/*
* do_directive - take a character string containing preprocessor
* directives separated by new-lines and execute them. This done
* by preprocessing the string.
*/
static void do_directive(s)
char *s;
{
str_src("<initialization>", s, (int)strlen(s));
while (interp_dir() != NULL)
;
}
/*
* undef_opt - take the argument to a -U option and, if it is valid,
* undefine it.
*/
static void undef_opt(s, len)
char *s;
int len;
{
struct token *mname;
int i;
/*
* The name is needed in the form of a token. Use the preprocessor
* to tokenize it.
*/
str_src("<options>", s, len);
mname = next_tok();
if (mname == NULL || mname->tok_id != Identifier ||
next_tok() != NULL) {
fprintf(stderr, "invalid argument to -U option: ");
for (i = 0; i < len; ++i)
putc(s[i], stderr); /* show offending argument */
putc('\n', stderr);
show_usage();
}
m_delete(mname);
}
/*
* define_opt - take an argument to a -D option and, if it is valid, perform
* the requested definition.
*/
static void define_opt(s, len, dflt)
char *s;
int len;
struct token *dflt;
{
struct token *mname;
struct token *t;
struct tok_lst *body;
struct tok_lst **ptlst, **trail_whsp;
int i;
/*
* The argument to -D must be tokenized.
*/
str_src("<options>", s, len);
/*
* Find the macro name.
*/
mname = next_tok();
if (mname == NULL || mname->tok_id != Identifier) {
fprintf(stderr, "invalid argument to -D option: ");
for (i = 0; i < len; ++i)
putc(s[i], stderr);
putc('\n', stderr);
show_usage();
}
/*
* Determine if the name is followed by '='.
*/
if (chk_eq_sign()) {
/*
* Macro body is given, strip leading white space
*/
t = next_tok();
if (t != NULL && t->tok_id == WhiteSpace) {
free_t(t);
t = next_tok();
}
/*
* Construct the token list for body of macro. Keep track of trailing
* white space so it can be deleted.
*/
body = NULL;
ptlst = &body;
trail_whsp = NULL;
while (t != NULL) {
t->flag &= ~LineChk;
(*ptlst) = new_t_lst(t);
if (t->tok_id == WhiteSpace)
trail_whsp = ptlst;
else
trail_whsp = NULL;
ptlst = &(*ptlst)->next;
t = next_tok();
}
/*
* strip trailing white space
*/
if (trail_whsp != NULL) {
free_t_lst(*trail_whsp);
*trail_whsp = NULL;
}
}
else {
/*
* There is no '=' after the macro name; use the supplied
* default value for the macro definition.
*/
if (next_tok() == NULL)
if (dflt == NULL)
body = NULL;
else
body = new_t_lst(copy_t(dflt));
else {
fprintf(stderr, "invalid argument to -D option: ");
for (i = 0; i < len; ++i)
putc(s[i], stderr);
putc('\n', stderr);
show_usage();
}
}
m_install(mname, NoArgs, 0, NULL, body); /* install macro definition */
}
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