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/* direvent - directory content watcher daemon
Copyright (C) 2012-2022 Sergey Poznyakoff
GNU direvent is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 3 of the License, or (at your
option) any later version.
GNU direvent is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with direvent. If not, see <http://www.gnu.org/licenses/>. */
#include "direvent.h"
#include <fnmatch.h>
#include <grecs.h>
static void
filename_pattern_free(void *p)
{
struct filename_pattern *pat = p;
switch (pat->type) {
case PAT_EXACT:
case PAT_GLOB:
free(pat->v.glob);
break;
case PAT_REGEX:
regfree(&pat->v.re);
}
free(pat);
}
struct filpatlist {
grecs_list_ptr_t list;
};
static int
is_glob(char const *str)
{
return strcspn(str, "[]*?") < strlen(str);
}
void
filpatlist_add_pattern(filpatlist_t *fptr, struct filename_pattern *pat)
{
grecs_list_ptr_t list;
if (!*fptr) {
*fptr = emalloc(sizeof(*fptr));
(*fptr)->list = grecs_list_create();
(*fptr)->list->free_entry = filename_pattern_free;
}
list = (*fptr)->list;
grecs_list_append(list, pat);
}
void
filpatlist_add_exact(filpatlist_t *fptr, char const *arg)
{
struct filename_pattern *pat = emalloc(sizeof(*pat));
pat->neg = 0;
pat->type = PAT_EXACT;
pat->v.glob = estrdup(arg);
filpatlist_add_pattern(fptr, pat);
}
int
filpatlist_add(filpatlist_t *fptr, char const *arg, grecs_locus_t *loc)
{
int flags = REG_EXTENDED|REG_NOSUB;
struct filename_pattern *pat;
pat = emalloc(sizeof(*pat));
if (*arg == '!') {
pat->neg = 1;
++arg;
} else
pat->neg = 0;
if (arg[0] == '/') {
int rc;
char *q, *p;
pat->type = PAT_REGEX;
p = strchr(arg+1, '/');
if (!p) {
grecs_error(loc, 0, _("unterminated regexp"));
free(pat);
return 1;
}
for (q = p + 1; *q; q++) {
switch (*q) {
case 'b':
flags &= ~REG_EXTENDED;
break;
case 'i':
flags |= REG_ICASE;
break;
default:
grecs_error(loc, 0,
_("unrecognized flag: %c"), *q);
free(pat);
return 1;
}
}
*p = 0;
rc = regcomp(&pat->v.re, arg + 1, flags);
*p = '/';
if (rc) {
char errbuf[128];
regerror(rc, &pat->v.re, errbuf, sizeof(errbuf));
grecs_error(loc, 0, "%s", errbuf);
filename_pattern_free(pat);
return 1;
}
} else {
pat->type = is_glob(arg) ? PAT_GLOB : PAT_EXACT;
pat->v.glob = estrdup(arg);
}
filpatlist_add_pattern(fptr, pat);
return 0;
}
void
filpatlist_destroy(filpatlist_t *fptr)
{
if (fptr && *fptr) {
grecs_list_free((*fptr)->list);
free(*fptr);
*fptr = NULL;
}
}
int
filpatlist_is_empty(filpatlist_t fp)
{
if (!fp)
return 1;
return grecs_list_size(fp->list) == 0;
}
int
filpatlist_match(filpatlist_t fp, const char *name)
{
struct grecs_list_entry *ep;
if (!fp || !fp->list)
return 0;
for (ep = fp->list->head; ep; ep = ep->next) {
struct filename_pattern *pat = ep->data;
int rc;
switch (pat->type) {
case PAT_EXACT:
rc = strcmp(pat->v.glob, name);
break;
case PAT_GLOB:
rc = fnmatch(pat->v.glob, name, FNM_PATHNAME);
break;
case PAT_REGEX:
rc = regexec(&pat->v.re, name, 0, NULL, 0);
break;
}
if (pat->neg)
rc = !rc;
if (rc == 0)
return 0;
}
return 1;
}
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