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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* filename_sane.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "config.h"
#include "fstree.h"
#include <string.h>
#if defined(_WIN32) || defined(__WINDOWS__) || defined(TEST_WIN32)
#ifdef _MSC_VER
#define strncasecmp _strnicmp
#define strcasecmp _stricmp
#endif
static const char *bad_names[] = {
"CON", "PRN", "AUX", "NUL",
"COM1", "COM2", "COM3", "COM4", "COM5", "COM6", "COM7", "COM8", "COM9",
"LPT1", "LPT2", "LPT3", "LPT4", "LPT5", "LPT6", "LPT7", "LPT8", "LPT9",
};
static bool is_allowed_by_os(const char *name)
{
size_t len, i;
for (i = 0; i < sizeof(bad_names) / sizeof(bad_names[0]); ++i) {
len = strlen(bad_names[i]);
if (strncasecmp(name, bad_names[i], len) != 0)
continue;
if (name[len] == '\0')
return false;
if (name[len] == '.' && strchr(name + len + 1, '.') == NULL)
return false;
}
return true;
}
#else
static bool is_allowed_by_os(const char *name)
{
(void)name;
return true;
}
#endif
bool is_filename_sane(const char *name, bool check_os_specific)
{
if (strcmp(name, ".") == 0 || strcmp(name, "..") == 0)
return false;
if (check_os_specific && !is_allowed_by_os(name))
return false;
while (*name != '\0') {
if (*name == '/')
return false;
#if defined(_WIN32) || defined(__WINDOWS__) || defined(TEST_WIN32)
if (check_os_specific) {
if (*name == '<' || *name == '>' || *name == ':')
return false;
if (*name == '"' || *name == '|' || *name == '?')
return false;
if (*name == '*' || *name == '\\' || *name <= 31)
return false;
}
#endif
++name;
}
return true;
}
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