static int match_line(struct grep_opt *opt, char *bol, char *eol,
enum grep_context ctx, int collect_hits)
{
struct grep_pat *p;
if (opt->extended)
return match_expr(opt, bol, eol, ctx, collect_hits);
/* we do not call with collect_hits without being extended */
for (p = opt->pattern_list; p; p = p->next) {
if (match_one_pattern(opt, p, bol, eol, ctx))
return 1;
}
return 0;
}
static int match_next_pattern(struct grep_pat *p, char *bol, char *eol,
enum grep_context ctx,
regmatch_t *pmatch, int eflags)
{
regmatch_t match;
if (!match_one_pattern(p, bol, eol, ctx, &match, eflags))
return 0;
if (match.rm_so < 0 || match.rm_eo < 0)
return 0;
if (pmatch->rm_so >= 0 && pmatch->rm_eo >= 0) {
if (match.rm_so > pmatch->rm_so)
return 1;
if (match.rm_so == pmatch->rm_so && match.rm_eo < pmatch->rm_eo)
return 1;
}
pmatch->rm_so = match.rm_so;
pmatch->rm_eo = match.rm_eo;
return 1;
}
static int match_expr_eval(struct grep_opt *o,
struct grep_expr *x,
char *bol, char *eol,
enum grep_context ctx,
int collect_hits)
{
int h = 0;
switch (x->node) {
case GREP_NODE_ATOM:
h = match_one_pattern(o, x->u.atom, bol, eol, ctx);
break;
case GREP_NODE_NOT:
h = !match_expr_eval(o, x->u.unary, bol, eol, ctx, 0);
break;
case GREP_NODE_AND:
if (!collect_hits)
return (match_expr_eval(o, x->u.binary.left,
bol, eol, ctx, 0) &&
match_expr_eval(o, x->u.binary.right,
bol, eol, ctx, 0));
h = match_expr_eval(o, x->u.binary.left, bol, eol, ctx, 0);
h &= match_expr_eval(o, x->u.binary.right, bol, eol, ctx, 0);
break;
case GREP_NODE_OR:
if (!collect_hits)
return (match_expr_eval(o, x->u.binary.left,
bol, eol, ctx, 0) ||
match_expr_eval(o, x->u.binary.right,
bol, eol, ctx, 0));
h = match_expr_eval(o, x->u.binary.left, bol, eol, ctx, 0);
x->u.binary.left->hit |= h;
h |= match_expr_eval(o, x->u.binary.right, bol, eol, ctx, 1);
break;
default:
die("Unexpected node type (internal error) %d\n", x->node);
}
if (collect_hits)
x->hit |= h;
return h;
}
static int match_expr_eval(struct grep_expr *x, char *bol, char *eol,
enum grep_context ctx, int collect_hits)
{
int h = 0;
regmatch_t match;
if (!x)
die("Not a valid grep expression");
switch (x->node) {
case GREP_NODE_TRUE:
h = 1;
break;
case GREP_NODE_ATOM:
h = match_one_pattern(x->u.atom, bol, eol, ctx, &match, 0);
break;
case GREP_NODE_NOT:
h = !match_expr_eval(x->u.unary, bol, eol, ctx, 0);
break;
case GREP_NODE_AND:
if (!match_expr_eval(x->u.binary.left, bol, eol, ctx, 0))
return 0;
h = match_expr_eval(x->u.binary.right, bol, eol, ctx, 0);
break;
case GREP_NODE_OR:
if (!collect_hits)
return (match_expr_eval(x->u.binary.left,
bol, eol, ctx, 0) ||
match_expr_eval(x->u.binary.right,
bol, eol, ctx, 0));
h = match_expr_eval(x->u.binary.left, bol, eol, ctx, 0);
x->u.binary.left->hit |= h;
h |= match_expr_eval(x->u.binary.right, bol, eol, ctx, 1);
break;
default:
die("Unexpected node type (internal error) %d", x->node);
}
if (collect_hits)
x->hit |= h;
return h;
}
static void match_up(char *data,int data_length,int hash_index){
int i;
for(i=0; i<pcount; i++){
match_one_pattern(&(patterns[i]),data,data_length,hash_index);
}
}