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/*
* Copyright 2003-2018 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program 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 2 of the License, or
* (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "ArchiveLookup.hxx"
#include "ArchiveDomain.hxx"
#include "Log.hxx"
#include <string.h>
#include <sys/stat.h>
#include <errno.h>
gcc_pure
static char *
FindSlash(char *p, size_t i) noexcept
{
for (; i > 0; --i)
if (p[i] == '/')
return p + i;
return nullptr;
}
gcc_pure
static const char *
FindSuffix(const char *p, const char *i) noexcept
{
for (; i > p; --i) {
if (*i == '.')
return i + 1;
}
return nullptr;
}
bool
archive_lookup(char *pathname, const char **archive,
const char **inpath, const char **suffix)
{
size_t idx = strlen(pathname);
char *slash = nullptr;
while (true) {
//try to stat if its real directory
struct stat st_info;
if (stat(pathname, &st_info) == -1) {
if (errno != ENOTDIR) {
FormatErrno(archive_domain,
"Failed to stat %s", pathname);
return false;
}
} else {
//is something found ins original path (is not an archive)
if (slash == nullptr)
return false;
//its a file ?
if (S_ISREG(st_info.st_mode)) {
//so the upper should be file
*archive = pathname;
*inpath = slash + 1;
//try to get suffix
*suffix = FindSuffix(pathname, slash - 1);
return true;
} else {
FormatError(archive_domain,
"Not a regular file: %s",
pathname);
return false;
}
}
//find one dir up
if (slash != nullptr)
*slash = '/';
slash = FindSlash(pathname, idx - 1);
if (slash == nullptr)
return false;
*slash = 0;
idx = slash - pathname;
}
}