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#include <glob.h>
#include <fnmatch.h>
#include <sys/stat.h>
#include <dirent.h>
#include <limits.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <stddef.h>
#include <unistd.h>
#include <stdio.h>
#include "libc.h"
struct match
{
struct match *next;
char name[1];
};
static int is_literal(const char *p, int useesc)
{
int bracket = 0;
for (; *p; p++) {
switch (*p) {
case '\\':
if (!useesc) break;
case '?':
case '*':
return 0;
case '[':
bracket = 1;
break;
case ']':
if (bracket) return 0;
break;
}
}
return 1;
}
static int append(struct match **tail, const char *name, size_t len, int mark)
{
struct match *new = malloc(sizeof(struct match) + len + 1);
if (!new) return -1;
(*tail)->next = new;
new->next = NULL;
strcpy(new->name, name);
if (mark) strcat(new->name, "/");
*tail = new;
return 0;
}
static int match_in_dir(const char *d, const char *p, int flags, int (*errfunc)(const char *path, int err), struct match **tail)
{
DIR *dir;
long long de_buf[(sizeof(struct dirent) + NAME_MAX + sizeof(long long))/sizeof(long long)];
struct dirent *de;
char pat[strlen(p)+1];
char *p2;
size_t l = strlen(d);
int literal;
int fnm_flags= ((flags & GLOB_NOESCAPE) ? FNM_NOESCAPE : 0) | FNM_PERIOD;
int error;
if ((p2 = strchr(p, '/'))) {
strcpy(pat, p);
pat[p2-p] = 0;
for (; *p2 == '/'; p2++);
p = pat;
}
literal = is_literal(p, !(flags & GLOB_NOESCAPE));
if (*d == '/' && !*(d+1)) l = 0;
/* rely on opendir failing for nondirectory objects */
dir = opendir(*d ? d : ".");
error = errno;
if (!dir) {
/* this is not an error -- we let opendir call stat for us */
if (error == ENOTDIR) return 0;
if (error == EACCES && !*p) {
struct stat st;
if (!stat(d, &st) && S_ISDIR(st.st_mode)) {
if (append(tail, d, l, l))
return GLOB_NOSPACE;
return 0;
}
}
if (errfunc(d, error) || (flags & GLOB_ERR))
return GLOB_ABORTED;
return 0;
}
if (!*p) {
error = append(tail, d, l, l) ? GLOB_NOSPACE : 0;
closedir(dir);
return error;
}
while (!(error = readdir_r(dir, (void *)de_buf, &de)) && de) {
char namebuf[l+de->d_reclen+2], *name = namebuf;
if (!literal && fnmatch(p, de->d_name, fnm_flags))
continue;
if (literal && strcmp(p, de->d_name))
continue;
if (p2 && de->d_type && !S_ISDIR(de->d_type<<12) && !S_ISLNK(de->d_type<<12))
continue;
if (*d) {
memcpy(name, d, l);
name[l] = '/';
strcpy(name+l+1, de->d_name);
} else {
name = de->d_name;
}
if (p2) {
if ((error = match_in_dir(name, p2, flags, errfunc, tail))) {
closedir(dir);
return error;
}
} else {
int mark = 0;
if (flags & GLOB_MARK) {
if (de->d_type)
mark = S_ISDIR(de->d_type<<12);
else {
struct stat st;
stat(name, &st);
mark = S_ISDIR(st.st_mode);
}
}
if (append(tail, name, l+de->d_reclen+1, mark)) {
closedir(dir);
return GLOB_NOSPACE;
}
}
}
closedir(dir);
if (error && (errfunc(d, error) || (flags & GLOB_ERR)))
return GLOB_ABORTED;
return 0;
}
static int ignore_err(const char *path, int err)
{
return 0;
}
static void freelist(struct match *head)
{
struct match *match, *next;
for (match=head->next; match; match=next) {
next = match->next;
free(match);
}
}
static int sort(const void *a, const void *b)
{
return strcmp(*(const char **)a, *(const char **)b);
}
int glob(const char *pat, int flags, int (*errfunc)(const char *path, int err), glob_t *g)
{
const char *p=pat, *d;
struct match head = { .next = NULL }, *tail = &head;
size_t cnt, i;
size_t offs = (flags & GLOB_DOOFFS) ? g->gl_offs : 0;
int error = 0;
if (*p == '/') {
for (; *p == '/'; p++);
d = "/";
} else {
d = "";
}
if (!errfunc) errfunc = ignore_err;
if (!(flags & GLOB_APPEND)) {
g->gl_offs = offs;
g->gl_pathc = 0;
g->gl_pathv = NULL;
}
if (*p) error = match_in_dir(d, p, flags, errfunc, &tail);
if (error == GLOB_NOSPACE) {
freelist(&head);
return error;
}
for (cnt=0, tail=head.next; tail; tail=tail->next, cnt++);
if (!cnt) {
if (flags & GLOB_NOCHECK) {
tail = &head;
if (append(&tail, pat, strlen(pat), 0))
return GLOB_NOSPACE;
cnt++;
} else
return GLOB_NOMATCH;
}
if (flags & GLOB_APPEND) {
char **pathv = realloc(g->gl_pathv, (offs + g->gl_pathc + cnt + 1) * sizeof(char *));
if (!pathv) {
freelist(&head);
return GLOB_NOSPACE;
}
g->gl_pathv = pathv;
offs += g->gl_pathc;
} else {
g->gl_pathv = malloc((offs + cnt + 1) * sizeof(char *));
if (!g->gl_pathv) {
freelist(&head);
return GLOB_NOSPACE;
}
for (i=0; i<offs; i++)
g->gl_pathv[i] = NULL;
}
for (i=0, tail=head.next; i<cnt; tail=tail->next, i++)
g->gl_pathv[offs + i] = tail->name;
g->gl_pathv[offs + i] = NULL;
g->gl_pathc += cnt;
if (!(flags & GLOB_NOSORT))
qsort(g->gl_pathv+offs, cnt, sizeof(char *), sort);
return error;
}
void globfree(glob_t *g)
{
size_t i;
for (i=0; i<g->gl_pathc; i++)
free(g->gl_pathv[g->gl_offs + i] - offsetof(struct match, name));
free(g->gl_pathv);
g->gl_pathc = 0;
g->gl_pathv = NULL;
}
LFS64(glob);
LFS64(globfree);
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