{
struct grep_pat *p = xcalloc(1, sizeof(*p));
p->pattern = pat;
+ p->patternlen = strlen(pat);
p->origin = "header";
p->no = 0;
p->token = GREP_PATTERN_HEAD;
void append_grep_pattern(struct grep_opt *opt, const char *pat,
const char *origin, int no, enum grep_pat_token t)
+{
+ append_grep_pat(opt, pat, strlen(pat), origin, no, t);
+}
+
+void append_grep_pat(struct grep_opt *opt, const char *pat, size_t patlen,
+ const char *origin, int no, enum grep_pat_token t)
{
struct grep_pat *p = xcalloc(1, sizeof(*p));
p->pattern = pat;
+ p->patternlen = patlen;
p->origin = origin;
p->no = no;
p->token = t;
append_header_grep_pattern(ret, pat->field,
pat->pattern);
else
- append_grep_pattern(ret, pat->pattern, pat->origin,
- pat->no, pat->token);
+ append_grep_pat(ret, pat->pattern, pat->patternlen,
+ pat->origin, pat->no, pat->token);
}
return ret;
return compile_pattern_or(list);
}
-void compile_grep_patterns(struct grep_opt *opt)
+static struct grep_expr *grep_true_expr(void)
+{
+ struct grep_expr *z = xcalloc(1, sizeof(*z));
+ z->node = GREP_NODE_TRUE;
+ return z;
+}
+
+static struct grep_expr *grep_or_expr(struct grep_expr *left, struct grep_expr *right)
+{
+ struct grep_expr *z = xcalloc(1, sizeof(*z));
+ z->node = GREP_NODE_OR;
+ z->u.binary.left = left;
+ z->u.binary.right = right;
+ return z;
+}
+
+static struct grep_expr *prep_header_patterns(struct grep_opt *opt)
{
struct grep_pat *p;
- struct grep_expr *header_expr = NULL;
-
- if (opt->header_list) {
- p = opt->header_list;
- header_expr = compile_pattern_expr(&p);
- if (p)
- die("incomplete pattern expression: %s", p->pattern);
- for (p = opt->header_list; p; p = p->next) {
- switch (p->token) {
- case GREP_PATTERN: /* atom */
- case GREP_PATTERN_HEAD:
- case GREP_PATTERN_BODY:
- compile_regexp(p, opt);
- break;
- default:
- opt->extended = 1;
- break;
- }
+ struct grep_expr *header_expr;
+ struct grep_expr *(header_group[GREP_HEADER_FIELD_MAX]);
+ enum grep_header_field fld;
+
+ if (!opt->header_list)
+ return NULL;
+ p = opt->header_list;
+ for (p = opt->header_list; p; p = p->next) {
+ if (p->token != GREP_PATTERN_HEAD)
+ die("bug: a non-header pattern in grep header list.");
+ if (p->field < 0 || GREP_HEADER_FIELD_MAX <= p->field)
+ die("bug: unknown header field %d", p->field);
+ compile_regexp(p, opt);
+ }
+
+ for (fld = 0; fld < GREP_HEADER_FIELD_MAX; fld++)
+ header_group[fld] = NULL;
+
+ for (p = opt->header_list; p; p = p->next) {
+ struct grep_expr *h;
+ struct grep_pat *pp = p;
+
+ h = compile_pattern_atom(&pp);
+ if (!h || pp != p->next)
+ die("bug: malformed header expr");
+ if (!header_group[p->field]) {
+ header_group[p->field] = h;
+ continue;
}
+ header_group[p->field] = grep_or_expr(h, header_group[p->field]);
}
+ header_expr = NULL;
+
+ for (fld = 0; fld < GREP_HEADER_FIELD_MAX; fld++) {
+ if (!header_group[fld])
+ continue;
+ if (!header_expr)
+ header_expr = grep_true_expr();
+ header_expr = grep_or_expr(header_group[fld], header_expr);
+ }
+ return header_expr;
+}
+
+void compile_grep_patterns(struct grep_opt *opt)
+{
+ struct grep_pat *p;
+ struct grep_expr *header_expr = prep_header_patterns(opt);
+
for (p = opt->pattern_list; p; p = p->next) {
switch (p->token) {
case GREP_PATTERN: /* atom */
else if (!opt->extended)
return;
- /* Then bundle them up in an expression.
- * A classic recursive descent parser would do.
- */
p = opt->pattern_list;
if (p)
opt->pattern_expression = compile_pattern_expr(&p);
if (!header_expr)
return;
- if (opt->pattern_expression) {
- struct grep_expr *z;
- z = xcalloc(1, sizeof(*z));
- z->node = GREP_NODE_OR;
- z->u.binary.left = opt->pattern_expression;
- z->u.binary.right = header_expr;
- opt->pattern_expression = z;
- } else {
+ if (!opt->pattern_expression)
opt->pattern_expression = header_expr;
- }
+ else
+ opt->pattern_expression = grep_or_expr(opt->pattern_expression,
+ header_expr);
opt->all_match = 1;
}
static void free_pattern_expr(struct grep_expr *x)
{
switch (x->node) {
+ case GREP_NODE_TRUE:
case GREP_NODE_ATOM:
break;
case GREP_NODE_NOT:
opt->output(opt, opt->null_following_name ? "\0" : "\n", 1);
}
-static int fixmatch(const char *pattern, char *line, char *eol,
- int ignore_case, regmatch_t *match)
+static int fixmatch(struct grep_pat *p, char *line, char *eol,
+ regmatch_t *match)
{
char *hit;
- if (ignore_case) {
+ if (p->ignore_case) {
char *s = line;
do {
- hit = strcasestr(s, pattern);
+ hit = strcasestr(s, p->pattern);
if (hit)
break;
s += strlen(s) + 1;
} while (s < eol);
} else
- hit = memmem(line, eol - line, pattern, strlen(pattern));
+ hit = memmem(line, eol - line, p->pattern, p->patternlen);
if (!hit) {
match->rm_so = match->rm_eo = -1;
}
else {
match->rm_so = hit - line;
- match->rm_eo = match->rm_so + strlen(pattern);
+ match->rm_eo = match->rm_so + p->patternlen;
return 0;
}
}
again:
if (p->fixed)
- hit = !fixmatch(p->pattern, bol, eol, p->ignore_case, pmatch);
+ hit = !fixmatch(p, bol, eol, pmatch);
else
hit = !regmatch(&p->regexp, bol, eol, pmatch, eflags);
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;
int hit;
regmatch_t m;
- if (p->fixed) {
- hit = !fixmatch(p->pattern, bol, bol + *left_p,
- p->ignore_case, &m);
- } else
+ if (p->fixed)
+ hit = !fixmatch(p, bol, bol + *left_p, &m);
+ else
hit = !regmatch(&p->regexp, bol, bol + *left_p, &m, 0);
if (!hit || m.rm_so < 0 || m.rm_eo < 0)
continue;