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fix possible char buffer draining problem; add DNS_LEXOPT_MULTILINE support

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Bob Halley 1999-01-26 08:26:19 +00:00
parent 9455756dab
commit 59be3f4a67
1 changed files with 30 additions and 0 deletions
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30
lib/isc/lex.c
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@ -55,6 +55,7 @@ struct isc_lex {
unsigned int comments;
isc_boolean_t comment_ok;
isc_boolean_t last_was_eol;
unsigned int paren_count;
isc_lexspecials_t specials;
LIST(struct inputsource) sources;
};
@ -83,6 +84,7 @@ isc_lex_create(isc_mem_t *mctx, size_t max_token, isc_lex_t **lexp) {
lex->comments = 0;
lex->comment_ok = ISC_TRUE;
lex->last_was_eol = ISC_TRUE;
lex->paren_count = 0;
memset(lex->specials, 0, 256);
INIT_LIST(lex->sources);
lex->magic = LEX_MAGIC;
@ -276,6 +278,8 @@ typedef enum {
lexstate_qstring
} lexstate;
#define IWSEOL (ISC_LEXOPT_INITIALWS | ISC_LEXOPT_EOL)
isc_result_t
isc_lex_gettoken(isc_lex_t *lex, unsigned int options, isc_token_t *tokenp) {
inputsource *source;
@ -310,6 +314,13 @@ isc_lex_gettoken(isc_lex_t *lex, unsigned int options, isc_token_t *tokenp) {
if (source->char_count == 0 && source->result != ISC_R_SUCCESS)
return (source->result);
if ((options & ISC_LEXOPT_DNSMULTILINE) != 0) {
if (lex->paren_count > 0)
options &= ~IWSEOL;
else
options |= IWSEOL;
}
curr = lex->data;
prev = NULL;
remaining = lex->max_token;
@ -317,6 +328,10 @@ isc_lex_gettoken(isc_lex_t *lex, unsigned int options, isc_token_t *tokenp) {
if (source->char_count > 0) {
source->char_count--;
c = source->chars[source->char_count];
} else if (source->result != ISC_R_SUCCESS) {
if (source->result != ISC_R_EOF)
return (source->result);
c = EOF;
} else if (source->is_file) {
stream = source->input;
@ -401,6 +416,21 @@ isc_lex_gettoken(isc_lex_t *lex, unsigned int options, isc_token_t *tokenp) {
state = lexstate_qstring;
} else if (lex->specials[c]) {
lex->last_was_eol = ISC_FALSE;
if ((c == '(' || c == ')') &&
(options & ISC_LEXOPT_DNSMULTILINE) != 0) {
if (c == '(') {
if (lex->paren_count == 0)
options &= ~IWSEOL;
lex->paren_count++;
} else {
if (lex->paren_count == 0)
return (ISC_R_UNBALANCED);
lex->paren_count--;
if (lex->paren_count == 0)
options |= IWSEOL;
}
continue;
}
tokenp->type = isc_tokentype_special;
tokenp->value.as_char = c;
done = ISC_TRUE;