+cleanup:
+ for (o = 0; o < vec_size(params); ++o)
+ macroparam_clean(¶ms[o]);
+ vec_free(params);
+ return retval;
+}
+
+/**
+ * #if - the FTEQCC way:
+ * defined(FOO) => true if FOO was #defined regardless of parameters or contents
+ * <numbers> => True if the number is not 0
+ * !<factor> => True if the factor yields false
+ * !!<factor> => ERROR on 2 or more unary nots
+ * <macro> => becomes the macro's FIRST token regardless of parameters
+ * <e> && <e> => True if both expressions are true
+ * <e> || <e> => True if either expression is true
+ * <string> => False
+ * <ident> => False (remember for macros the <macro> rule applies instead)
+ * Unary + and - are weird and wrong in fteqcc so we don't allow them
+ * parenthesis in expressions are allowed
+ * parameter lists on macros are errors
+ * No mathematical calculations are executed
+ */
+static bool ftepp_if_expr(ftepp_t *ftepp, bool *out, double *value_out);
+static bool ftepp_if_op(ftepp_t *ftepp)
+{
+ ftepp->lex->flags.noops = false;
+ ftepp_next(ftepp);
+ if (!ftepp_skipspace(ftepp))
+ return false;
+ ftepp->lex->flags.noops = true;
+ return true;
+}
+static bool ftepp_if_value(ftepp_t *ftepp, bool *out, double *value_out)
+{
+ ppmacro *macro;
+ bool wasnot = false;
+ bool wasneg = false;
+
+ if (!ftepp_skipspace(ftepp))
+ return false;
+
+ while (ftepp->token == '!') {
+ wasnot = true;
+ ftepp_next(ftepp);
+ if (!ftepp_skipspace(ftepp))
+ return false;
+ }
+
+ if (ftepp->token == TOKEN_OPERATOR && !strcmp(ftepp_tokval(ftepp), "-"))
+ {
+ wasneg = true;
+ ftepp_next(ftepp);
+ if (!ftepp_skipspace(ftepp))
+ return false;
+ }
+
+ switch (ftepp->token) {
+ case TOKEN_IDENT:
+ case TOKEN_TYPENAME:
+ case TOKEN_KEYWORD:
+ if (!strcmp(ftepp_tokval(ftepp), "defined")) {
+ ftepp_next(ftepp);
+ if (!ftepp_skipspace(ftepp))
+ return false;
+ if (ftepp->token != '(') {
+ ftepp_error(ftepp, "`defined` keyword in #if requires a macro name in parenthesis");
+ return false;
+ }
+ ftepp_next(ftepp);
+ if (!ftepp_skipspace(ftepp))
+ return false;
+ if (ftepp->token != TOKEN_IDENT &&
+ ftepp->token != TOKEN_TYPENAME &&
+ ftepp->token != TOKEN_KEYWORD)
+ {
+ ftepp_error(ftepp, "defined() used on an unexpected token type");
+ return false;
+ }
+ macro = ftepp_macro_find(ftepp, ftepp_tokval(ftepp));
+ *out = !!macro;
+ ftepp_next(ftepp);
+ if (!ftepp_skipspace(ftepp))
+ return false;
+ if (ftepp->token != ')') {
+ ftepp_error(ftepp, "expected closing paren");
+ return false;
+ }
+ break;
+ }
+
+ macro = ftepp_macro_find(ftepp, ftepp_tokval(ftepp));
+ if (!macro || !vec_size(macro->output)) {
+ *out = false;
+ *value_out = 0;
+ } else {
+ /* This does not expand recursively! */
+ switch (macro->output[0]->token) {
+ case TOKEN_INTCONST:
+ *value_out = macro->output[0]->constval.i;
+ *out = !!(macro->output[0]->constval.i);
+ break;
+ case TOKEN_FLOATCONST:
+ *value_out = macro->output[0]->constval.f;
+ *out = !!(macro->output[0]->constval.f);
+ break;
+ default:
+ *out = false;
+ break;
+ }
+ }
+ break;
+ case TOKEN_STRINGCONST:
+ *value_out = 0;
+ *out = false;
+ break;
+ case TOKEN_INTCONST:
+ *value_out = ftepp->lex->tok.constval.i;
+ *out = !!(ftepp->lex->tok.constval.i);
+ break;
+ case TOKEN_FLOATCONST:
+ *value_out = ftepp->lex->tok.constval.f;
+ *out = !!(ftepp->lex->tok.constval.f);
+ break;
+
+ case '(':
+ ftepp_next(ftepp);
+ if (!ftepp_if_expr(ftepp, out, value_out))
+ return false;
+ if (ftepp->token != ')') {
+ ftepp_error(ftepp, "expected closing paren in #if expression");
+ return false;
+ }
+ break;
+
+ default:
+ ftepp_error(ftepp, "junk in #if: `%s` ...", ftepp_tokval(ftepp));
+ if (OPTS_OPTION_BOOL(OPTION_DEBUG))
+ ftepp_error(ftepp, "internal: token %i\n", ftepp->token);
+ return false;
+ }
+ if (wasneg)
+ *value_out = -*value_out;
+ if (wasnot) {
+ *out = !*out;
+ *value_out = (*out ? 1 : 0);
+ }
+ return true;
+}
+
+/*
+static bool ftepp_if_nextvalue(ftepp_t *ftepp, bool *out, double *value_out)
+{
+ if (!ftepp_next(ftepp))
+ return false;
+ return ftepp_if_value(ftepp, out, value_out);
+}
+*/
+
+static bool ftepp_if_expr(ftepp_t *ftepp, bool *out, double *value_out)
+{
+ if (!ftepp_if_value(ftepp, out, value_out))
+ return false;
+
+ if (!ftepp_if_op(ftepp))
+ return false;
+
+ if (ftepp->token == ')' || ftepp->token != TOKEN_OPERATOR)
+ return true;
+
+ /* FTEQCC is all right-associative and no precedence here */
+ if (!strcmp(ftepp_tokval(ftepp), "&&") ||
+ !strcmp(ftepp_tokval(ftepp), "||"))
+ {
+ bool next = false;
+ char opc = ftepp_tokval(ftepp)[0];
+ double nextvalue;
+
+ (void)nextvalue;
+ if (!ftepp_next(ftepp))
+ return false;
+ if (!ftepp_if_expr(ftepp, &next, &nextvalue))
+ return false;
+
+ if (opc == '&')
+ *out = *out && next;
+ else
+ *out = *out || next;
+
+ *value_out = (*out ? 1 : 0);
+ return true;
+ }
+ else if (!strcmp(ftepp_tokval(ftepp), "==") ||
+ !strcmp(ftepp_tokval(ftepp), "!=") ||
+ !strcmp(ftepp_tokval(ftepp), ">=") ||
+ !strcmp(ftepp_tokval(ftepp), "<=") ||
+ !strcmp(ftepp_tokval(ftepp), ">") ||
+ !strcmp(ftepp_tokval(ftepp), "<"))
+ {
+ bool next = false;
+ const char opc0 = ftepp_tokval(ftepp)[0];
+ const char opc1 = ftepp_tokval(ftepp)[1];
+ double other;
+
+ if (!ftepp_next(ftepp))
+ return false;
+ if (!ftepp_if_expr(ftepp, &next, &other))
+ return false;
+
+ if (opc0 == '=')
+ *out = (*value_out == other);
+ else if (opc0 == '!')
+ *out = (*value_out != other);
+ else if (opc0 == '>') {
+ if (opc1 == '=') *out = (*value_out >= other);
+ else *out = (*value_out > other);
+ }
+ else if (opc0 == '<') {
+ if (opc1 == '=') *out = (*value_out <= other);
+ else *out = (*value_out < other);
+ }
+ *value_out = (*out ? 1 : 0);
+
+ return true;
+ }
+ else {
+ ftepp_error(ftepp, "junk after #if");
+ return false;
+ }
+}
+
+static bool ftepp_if(ftepp_t *ftepp, ppcondition *cond)
+{
+ bool result = false;
+ double dummy = 0;
+
+ memset(cond, 0, sizeof(*cond));
+ (void)ftepp_next(ftepp);
+
+ if (!ftepp_skipspace(ftepp))
+ return false;
+ if (ftepp->token == TOKEN_EOL) {
+ ftepp_error(ftepp, "expected expression for #if-directive");
+ return false;
+ }
+
+ if (!ftepp_if_expr(ftepp, &result, &dummy))
+ return false;
+
+ cond->on = result;
+ return true;
+}
+
+/**
+ * ifdef is rather simple
+ */
+static bool ftepp_ifdef(ftepp_t *ftepp, ppcondition *cond)
+{
+ ppmacro *macro;
+ memset(cond, 0, sizeof(*cond));
+ (void)ftepp_next(ftepp);
+ if (!ftepp_skipspace(ftepp))
+ return false;
+
+ switch (ftepp->token) {
+ case TOKEN_IDENT:
+ case TOKEN_TYPENAME:
+ case TOKEN_KEYWORD:
+ macro = ftepp_macro_find(ftepp, ftepp_tokval(ftepp));
+ break;
+ default:
+ ftepp_error(ftepp, "expected macro name");
+ return false;
+ }
+
+ (void)ftepp_next(ftepp);
+ if (!ftepp_skipspace(ftepp))
+ return false;
+ /* relaxing this condition
+ if (ftepp->token != TOKEN_EOL && ftepp->token != TOKEN_EOF) {
+ ftepp_error(ftepp, "stray tokens after #ifdef");
+ return false;
+ }
+ */
+ cond->on = !!macro;
+ return true;
+}
+
+/**
+ * undef is also simple
+ */
+static bool ftepp_undef(ftepp_t *ftepp)
+{
+ (void)ftepp_next(ftepp);
+ if (!ftepp_skipspace(ftepp))
+ return false;
+
+ if (ftepp->output_on) {
+ switch (ftepp->token) {
+ case TOKEN_IDENT:
+ case TOKEN_TYPENAME:
+ case TOKEN_KEYWORD:
+ ftepp_macro_delete(ftepp, ftepp_tokval(ftepp));
+ break;
+ default:
+ ftepp_error(ftepp, "expected macro name");
+ return false;
+ }
+ }
+
+ (void)ftepp_next(ftepp);
+ if (!ftepp_skipspace(ftepp))
+ return false;
+ /* relaxing this condition
+ if (ftepp->token != TOKEN_EOL && ftepp->token != TOKEN_EOF) {
+ ftepp_error(ftepp, "stray tokens after #ifdef");
+ return false;
+ }
+ */
+ return true;
+}
+
+/* Special unescape-string function which skips a leading quote
+ * and stops at a quote, not just at \0
+ */
+static void unescape(const char *str, char *out) {
+ ++str;
+ while (*str && *str != '"') {
+ if (*str == '\\') {
+ ++str;
+ switch (*str) {
+ case '\\': *out++ = *str; break;
+ case '"': *out++ = *str; break;
+ case 'a': *out++ = '\a'; break;
+ case 'b': *out++ = '\b'; break;
+ case 'r': *out++ = '\r'; break;
+ case 'n': *out++ = '\n'; break;
+ case 't': *out++ = '\t'; break;
+ case 'f': *out++ = '\f'; break;
+ case 'v': *out++ = '\v'; break;
+ default:
+ *out++ = '\\';
+ *out++ = *str;
+ break;
+ }
+ ++str;
+ continue;
+ }
+
+ *out++ = *str++;
+ }
+ *out = 0;
+}
+
+static char *ftepp_include_find_path(const char *file, const char *pathfile)
+{
+ FILE *fp;
+ char *filename = NULL;
+ const char *last_slash;
+ size_t len;
+
+ if (!pathfile)
+ return NULL;
+
+ last_slash = strrchr(pathfile, '/');
+
+ if (last_slash) {
+ len = last_slash - pathfile;
+ memcpy(vec_add(filename, len), pathfile, len);
+ vec_push(filename, '/');
+ }
+
+ len = strlen(file);
+ memcpy(vec_add(filename, len+1), file, len);
+ vec_last(filename) = 0;
+
+ fp = fs_file_open(filename, "rb");
+ if (fp) {
+ fs_file_close(fp);
+ return filename;
+ }
+ vec_free(filename);
+ return NULL;
+}
+
+static char *ftepp_include_find(ftepp_t *ftepp, const char *file)
+{
+ char *filename = NULL;
+
+ filename = ftepp_include_find_path(file, ftepp->includename);
+ if (!filename)
+ filename = ftepp_include_find_path(file, ftepp->itemname);
+ return filename;
+}
+
+static bool ftepp_directive_warning(ftepp_t *ftepp) {
+ char *message = NULL;
+
+ if (!ftepp_skipspace(ftepp))
+ return false;
+
+ /* handle the odd non string constant case so it works like C */
+ if (ftepp->token != TOKEN_STRINGCONST) {
+ bool store = false;
+ vec_upload(message, "#warning", 8);
+ ftepp_next(ftepp);
+ while (ftepp->token != TOKEN_EOL) {
+ vec_upload(message, ftepp_tokval(ftepp), strlen(ftepp_tokval(ftepp)));
+ ftepp_next(ftepp);
+ }
+ vec_push(message, '\0');
+ if (ftepp->output_on)
+ store = ftepp_warn(ftepp, WARN_CPP, message);
+ else
+ store = false;
+ vec_free(message);
+ return store;
+ }
+
+ if (!ftepp->output_on)
+ return false;
+
+ unescape (ftepp_tokval(ftepp), ftepp_tokval(ftepp));
+ return ftepp_warn(ftepp, WARN_CPP, "#warning %s", ftepp_tokval(ftepp));
+}
+
+static void ftepp_directive_error(ftepp_t *ftepp) {
+ char *message = NULL;
+
+ if (!ftepp_skipspace(ftepp))
+ return;
+
+ /* handle the odd non string constant case so it works like C */
+ if (ftepp->token != TOKEN_STRINGCONST) {
+ vec_upload(message, "#error", 6);
+ ftepp_next(ftepp);
+ while (ftepp->token != TOKEN_EOL) {
+ vec_upload(message, ftepp_tokval(ftepp), strlen(ftepp_tokval(ftepp)));
+ ftepp_next(ftepp);
+ }
+ vec_push(message, '\0');
+ if (ftepp->output_on)
+ ftepp_error(ftepp, message);
+ vec_free(message);
+ return;
+ }
+
+ if (!ftepp->output_on)
+ return;
+
+ unescape (ftepp_tokval(ftepp), ftepp_tokval(ftepp));
+ ftepp_error(ftepp, "#error %s", ftepp_tokval(ftepp));
+}
+
+static void ftepp_directive_message(ftepp_t *ftepp) {
+ char *message = NULL;
+
+ if (!ftepp_skipspace(ftepp))
+ return;
+
+ /* handle the odd non string constant case so it works like C */
+ if (ftepp->token != TOKEN_STRINGCONST) {
+ vec_upload(message, "#message", 8);
+ ftepp_next(ftepp);
+ while (ftepp->token != TOKEN_EOL) {
+ vec_upload(message, ftepp_tokval(ftepp), strlen(ftepp_tokval(ftepp)));
+ ftepp_next(ftepp);
+ }
+ vec_push(message, '\0');
+ if (ftepp->output_on)
+ con_cprintmsg(&ftepp->lex->tok.ctx, LVL_MSG, "message", message);
+ vec_free(message);
+ return;
+ }
+
+ if (!ftepp->output_on)
+ return;
+
+ unescape (ftepp_tokval(ftepp), ftepp_tokval(ftepp));
+ con_cprintmsg(&ftepp->lex->tok.ctx, LVL_MSG, "message", ftepp_tokval(ftepp));
+}
+
+/**
+ * Include a file.
+ * FIXME: do we need/want a -I option?
+ * FIXME: what about when dealing with files in subdirectories coming from a progs.src?
+ */
+static bool ftepp_include(ftepp_t *ftepp)
+{
+ lex_file *old_lexer = ftepp->lex;
+ lex_file *inlex;
+ lex_ctx ctx;
+ char lineno[128];
+ char *filename;
+ char *old_includename;
+
+ (void)ftepp_next(ftepp);
+ if (!ftepp_skipspace(ftepp))
+ return false;
+
+ if (ftepp->token != TOKEN_STRINGCONST) {
+ ftepp_error(ftepp, "expected filename to include");
+ return false;
+ }
+
+ if (!ftepp->output_on) {
+ ftepp_next(ftepp);
+ return true;
+ }
+
+ ctx = ftepp_ctx(ftepp);
+
+ unescape(ftepp_tokval(ftepp), ftepp_tokval(ftepp));
+
+ ftepp_out(ftepp, "\n#pragma file(", false);
+ ftepp_out(ftepp, ftepp_tokval(ftepp), false);
+ ftepp_out(ftepp, ")\n#pragma line(1)\n", false);
+
+ filename = ftepp_include_find(ftepp, ftepp_tokval(ftepp));
+ if (!filename) {
+ ftepp_error(ftepp, "failed to open include file `%s`", ftepp_tokval(ftepp));
+ return false;
+ }
+ inlex = lex_open(filename);
+ if (!inlex) {
+ ftepp_error(ftepp, "open failed on include file `%s`", filename);
+ vec_free(filename);
+ return false;
+ }
+ ftepp->lex = inlex;
+ old_includename = ftepp->includename;
+ ftepp->includename = filename;
+ if (!ftepp_preprocess(ftepp)) {
+ vec_free(ftepp->includename);
+ ftepp->includename = old_includename;
+ lex_close(ftepp->lex);
+ ftepp->lex = old_lexer;
+ return false;
+ }
+ vec_free(ftepp->includename);
+ ftepp->includename = old_includename;
+ lex_close(ftepp->lex);
+ ftepp->lex = old_lexer;
+
+ ftepp_out(ftepp, "\n#pragma file(", false);
+ ftepp_out(ftepp, ctx.file, false);
+ util_snprintf(lineno, sizeof(lineno), ")\n#pragma line(%lu)\n", (unsigned long)(ctx.line+1));
+ ftepp_out(ftepp, lineno, false);
+
+ /* skip the line */
+ (void)ftepp_next(ftepp);
+ if (!ftepp_skipspace(ftepp))
+ return false;
+ if (ftepp->token != TOKEN_EOL) {
+ ftepp_error(ftepp, "stray tokens after #include");
+ return false;
+ }
+ (void)ftepp_next(ftepp);
+
+ return true;
+}
+
+/* Basic structure handlers */
+static bool ftepp_else_allowed(ftepp_t *ftepp)
+{
+ if (!vec_size(ftepp->conditions)) {
+ ftepp_error(ftepp, "#else without #if");
+ return false;
+ }
+ if (vec_last(ftepp->conditions).had_else) {
+ ftepp_error(ftepp, "multiple #else for a single #if");
+ return false;
+ }
+ return true;
+}
+
+static bool ftepp_hash(ftepp_t *ftepp)
+{
+ ppcondition cond;
+ ppcondition *pc;
+
+ lex_ctx ctx = ftepp_ctx(ftepp);
+
+ if (!ftepp_skipspace(ftepp))
+ return false;
+
+ switch (ftepp->token) {
+ case TOKEN_KEYWORD:
+ case TOKEN_IDENT:
+ case TOKEN_TYPENAME:
+ if (!strcmp(ftepp_tokval(ftepp), "define")) {
+ return ftepp_define(ftepp);
+ }
+ else if (!strcmp(ftepp_tokval(ftepp), "undef")) {
+ return ftepp_undef(ftepp);
+ }
+ else if (!strcmp(ftepp_tokval(ftepp), "ifdef")) {
+ if (!ftepp_ifdef(ftepp, &cond))
+ return false;
+ cond.was_on = cond.on;
+ vec_push(ftepp->conditions, cond);
+ ftepp->output_on = ftepp->output_on && cond.on;
+ break;
+ }
+ else if (!strcmp(ftepp_tokval(ftepp), "ifndef")) {
+ if (!ftepp_ifdef(ftepp, &cond))
+ return false;
+ cond.on = !cond.on;
+ cond.was_on = cond.on;
+ vec_push(ftepp->conditions, cond);
+ ftepp->output_on = ftepp->output_on && cond.on;
+ break;
+ }
+ else if (!strcmp(ftepp_tokval(ftepp), "elifdef")) {
+ if (!ftepp_else_allowed(ftepp))
+ return false;
+ if (!ftepp_ifdef(ftepp, &cond))
+ return false;
+ pc = &vec_last(ftepp->conditions);
+ pc->on = !pc->was_on && cond.on;
+ pc->was_on = pc->was_on || pc->on;
+ ftepp_update_output_condition(ftepp);
+ break;
+ }
+ else if (!strcmp(ftepp_tokval(ftepp), "elifndef")) {
+ if (!ftepp_else_allowed(ftepp))
+ return false;
+ if (!ftepp_ifdef(ftepp, &cond))
+ return false;
+ cond.on = !cond.on;
+ pc = &vec_last(ftepp->conditions);
+ pc->on = !pc->was_on && cond.on;
+ pc->was_on = pc->was_on || pc->on;
+ ftepp_update_output_condition(ftepp);
+ break;
+ }
+ else if (!strcmp(ftepp_tokval(ftepp), "elif")) {
+ if (!ftepp_else_allowed(ftepp))
+ return false;
+ if (!ftepp_if(ftepp, &cond))
+ return false;
+ pc = &vec_last(ftepp->conditions);
+ pc->on = !pc->was_on && cond.on;
+ pc->was_on = pc->was_on || pc->on;
+ ftepp_update_output_condition(ftepp);
+ break;
+ }
+ else if (!strcmp(ftepp_tokval(ftepp), "if")) {
+ if (!ftepp_if(ftepp, &cond))
+ return false;
+ cond.was_on = cond.on;
+ vec_push(ftepp->conditions, cond);
+ ftepp->output_on = ftepp->output_on && cond.on;
+ break;
+ }
+ else if (!strcmp(ftepp_tokval(ftepp), "else")) {
+ if (!ftepp_else_allowed(ftepp))
+ return false;
+ pc = &vec_last(ftepp->conditions);
+ pc->on = !pc->was_on;
+ pc->had_else = true;
+ ftepp_next(ftepp);
+ ftepp_update_output_condition(ftepp);
+ break;
+ }
+ else if (!strcmp(ftepp_tokval(ftepp), "endif")) {
+ if (!vec_size(ftepp->conditions)) {
+ ftepp_error(ftepp, "#endif without #if");
+ return false;
+ }
+ vec_pop(ftepp->conditions);
+ ftepp_next(ftepp);
+ ftepp_update_output_condition(ftepp);
+ break;
+ }
+ else if (!strcmp(ftepp_tokval(ftepp), "include")) {
+ return ftepp_include(ftepp);
+ }
+ else if (!strcmp(ftepp_tokval(ftepp), "pragma")) {
+ ftepp_out(ftepp, "#", false);
+ break;
+ }
+ else if (!strcmp(ftepp_tokval(ftepp), "warning")) {
+ ftepp_directive_warning(ftepp);
+ break;
+ }
+ else if (!strcmp(ftepp_tokval(ftepp), "error")) {
+ ftepp_directive_error(ftepp);
+ break;
+ }
+ else if (!strcmp(ftepp_tokval(ftepp), "message")) {
+ ftepp_directive_message(ftepp);
+ break;
+ }
+ else {
+ if (ftepp->output_on) {
+ ftepp_error(ftepp, "unrecognized preprocessor directive: `%s`", ftepp_tokval(ftepp));
+ return false;
+ } else {
+ ftepp_next(ftepp);
+ break;
+ }
+ }
+ /* break; never reached */
+ default:
+ ftepp_error(ftepp, "unexpected preprocessor token: `%s`", ftepp_tokval(ftepp));
+ return false;
+ case TOKEN_EOL:
+ ftepp_errorat(ftepp, ctx, "empty preprocessor directive");
+ return false;
+ case TOKEN_EOF:
+ ftepp_error(ftepp, "missing newline at end of file", ftepp_tokval(ftepp));
+ return false;
+
+ /* Builtins! Don't forget the builtins! */
+ case TOKEN_INTCONST:
+ case TOKEN_FLOATCONST:
+ ftepp_out(ftepp, "#", false);
+ return true;
+ }
+ if (!ftepp_skipspace(ftepp))
+ return false;
+ return true;