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Simplify expr_match in osscan

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This commit is contained in:
dmiller
2023-11-09 23:44:08 +00:00
parent 5df180e037
commit b4959d04f4
1 changed files with 22 additions and 23 deletions
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45
osscan.cc
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@@ -294,39 +294,38 @@ void FingerPrint::erase() {
No parentheses are allowed. */
static bool expr_match(const char *val, const char *expr) {
const char *p, *q, *q1; /* OHHHH YEEEAAAAAHHHH!#!@#$!% */
char *endptr;
unsigned int val_num, expr_num, expr_num1;
bool is_numeric;
size_t vlen = strlen(val);
p = expr;
val_num = strtol(val, &endptr, 16);
is_numeric = !*endptr;
// TODO: this could be a lot faster if we compiled fingerprints to a bytecode
// instead of re-parsing every time.
do {
q = strchr(p, '|');
if (is_numeric && (*p == '<' || *p == '>')) {
expr_num = strtol(p + 1, &endptr, 16);
if (endptr == q || !*endptr) {
if ((*p == '<' && val_num < expr_num)
|| (*p == '>' && val_num > expr_num)) {
return true;
}
size_t explen = q ? q - p : strlen(p);
if (*p == '>') {
if ((vlen > explen - 1)
|| (vlen == explen - 1 && strncmp(val, p + 1, vlen) > 0)) {
return true;
}
} else if (is_numeric && ((q1 = strchr(p, '-')) != NULL)) {
expr_num = strtol(p, &endptr, 16);
if (endptr == q1) {
expr_num1 = strtol(q1 + 1, &endptr, 16);
if (endptr == q || !*endptr) {
assert(expr_num1 > expr_num);
if (val_num >= expr_num && val_num <= expr_num1) {
}
else if (*p == '<') {
if ((vlen < explen - 1)
|| (vlen == explen - 1 && strncmp(val, p + 1, vlen) < 0)) {
return true;
}
} else {
q1 = strchr(p, '-');
if (q1 != NULL) {
size_t explen1 = q1 - p;
if ((vlen > explen1)
|| (vlen == explen1 && strncmp(val, p + 1, vlen) >= 0)) {
explen -= (explen1 + 1);
if ((vlen < explen)
|| (vlen == explen && strncmp(val, p + 1, vlen) <= 0)) {
return true;
}
}
}
} else {
if ((q && !strncmp(p, val, q - p)) || (!q && !strcmp(p, val))) {
else if (vlen == explen && !strncmp(p, val, vlen)) {
return true;
}
}