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preproc: fix list iteration in the case of expand_indirect()

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Linked lists where an element may be deleted or substituted during
processing can be subtle to deal with.  Fix the iteration conditions
in this particular case.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
H. Peter Anvin 2008-10-19 16:24:53 -07:00
parent 992fe7591d
commit c0ab1cd15a
1 changed files with 37 additions and 34 deletions
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71
preproc.c
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@ -3901,7 +3901,8 @@ static Token *expand_id(Token * tline)
}
/*
* Expand indirect tokens, %[...].
* Expand indirect tokens, %[...]. Just like expand_smacro(),
* the input is considered destroyed.
*/
static Token *expand_indirect(Token * tline, int level)
{
@ -3914,42 +3915,44 @@ static Token *expand_indirect(Token * tline, int level)
error(ERR_NONFATAL, "interminable indirect expansion");
} else {
thead = NULL;
for (tp = &tline; (t = *tp); thead = t, tp = &t->next) {
if (t->type != TOK_INDIRECT)
continue;
it = tokenize(t->text);
it = expand_indirect(it, level+1);
it = expand_smacro(it);
while (it) {
skip = false;
switch (thead ? thead->type : TOK_NONE) {
case TOK_WHITESPACE:
skip = (it->type == TOK_WHITESPACE);
break;
case TOK_ID:
case TOK_NUMBER:
if (it->type == thead->type || it->type == TOK_NUMBER) {
char *tmp = nasm_strcat(thead->text, it->text);
thead->text = tmp;
skip = true;
tp = &tline;
while ((t = *tp)) {
if (t->type != TOK_INDIRECT) {
thead = t;
tp = &t->next;
} else {
it = tokenize(t->text);
it = expand_indirect(it, level+1);
it = expand_smacro(it);
while (it) {
skip = false;
switch (thead ? thead->type : TOK_NONE) {
case TOK_WHITESPACE:
skip = (it->type == TOK_WHITESPACE);
break;
case TOK_ID:
case TOK_NUMBER:
if (it->type == thead->type || it->type == TOK_NUMBER) {
char *tmp = nasm_strcat(thead->text, it->text);
nasm_free(thead->text);
thead->text = tmp;
skip = true;
}
break;
default:
break;
}
if (skip) {
it = delete_Token(it);
} else {
*tp = thead = it;
tp = &it->next;
it = it->next;
}
break;
default:
break;
}
if (skip) {
it = delete_Token(it);
} else {
*tp = thead = it;
tp = &it->next;
it = it->next;
}
*tp = thead = t->next;
t = delete_Token(t);
}
*tp = t->next;
delete_Token(t);
}
}
return tline;