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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* mkdir_p.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "common.h"
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#ifdef _WIN32
/*
Supported paths:
- <letter>:\ <absolute path>
- \\<server>\<share>\ <absolute path>
- \\?\<letter>:\ <absolute path>
- \\?\UNC\<server>\<share>\ <absolute path>
- Relative path not starting with '\'
*/
static WCHAR *skip_unc_path(WCHAR *ptr)
{
/* server */
if (*ptr == '\0' || *ptr == '\\')
return NULL;
while (*ptr != '\0' && *ptr != '\\')
++ptr;
if (*(ptr++) != '\\')
return NULL;
/* share */
if (*ptr == '\0' || *ptr == '\\')
return NULL;
while (*ptr != '\0' && *ptr != '\\')
++ptr;
return (*ptr == '\\') ? (ptr + 1) : ptr;
}
static WCHAR *skip_prefix(WCHAR *ptr)
{
if (isalpha(ptr[0]) && ptr[1] == ':' && ptr[2] == '\\')
return ptr + 3;
if (ptr[0] == '\\' && ptr[1] == '\\') {
if (ptr[2] == '?') {
if (ptr[3] != '\\')
return NULL;
ptr += 4;
if ((ptr[0] == 'u' || ptr[0] == 'U') &&
(ptr[1] == 'n' || ptr[1] == 'N') &&
(ptr[2] == 'c' || ptr[2] == 'C') &&
ptr[3] == '\\') {
ptr += 4;
return skip_unc_path(ptr);
}
if (isalpha(ptr[0]) && ptr[1] == ':' && ptr[2] == '\\')
return ptr + 3;
return NULL;
}
return skip_unc_path(ptr);
}
if (ptr[0] == '\\')
return NULL;
return ptr;
}
int mkdir_p(const char *path)
{
WCHAR *wpath, *ptr, *end;
DWORD error;
bool done;
wpath = path_to_windows(path);
if (wpath == NULL)
return -1;
ptr = skip_prefix(wpath);
if (ptr == NULL) {
fprintf(stderr, "Illegal or unsupported path: %s\n", path);
goto fail;
}
while (*ptr != '\0') {
if (*ptr == '\\') {
++ptr;
continue;
}
for (end = ptr; *end != '\0' && *end != '\\'; ++end)
++end;
if (*end == '\\') {
done = false;
*end = '\0';
} else {
done = true;
}
if (!CreateDirectoryW(wpath, NULL)) {
error = GetLastError();
if (error != ERROR_ALREADY_EXISTS) {
fprintf(stderr, "Creating %s: %ld\n",
path, error);
goto fail;
}
}
if (!done)
*end = '\\';
ptr = done ? end : (end + 1);
}
free(wpath);
return 0;
fail:
free(wpath);
return -1;
}
#else
int mkdir_p(const char *path)
{
size_t i, len;
char *buffer;
while (path[0] == '/' && path[1] == '/')
++path;
if (*path == '\0' || (path[0] == '/' && path[1] == '\0'))
return 0;
len = strlen(path) + 1;
buffer = alloca(len);
for (i = 0; i < len; ++i) {
if (i > 0 && (path[i] == '/' || path[i] == '\0')) {
buffer[i] = '\0';
if (mkdir(buffer, 0755) != 0) {
if (errno != EEXIST) {
fprintf(stderr, "mkdir %s: %s\n",
buffer, strerror(errno));
return -1;
}
}
}
buffer[i] = path[i];
}
return 0;
}
#endif
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