cedll.c

#include <string.h>
#include <limits.h>
#include <windows.h>

int GetComputerName(char *buffer, unsigned long int *size) {
	HKEY hKey;
	unsigned long int DataSize = 4096;
	if(RegOpenKeyEx(HKEY_LOCAL_MACHINE, L"Ident", 0, 0, &hKey) != ERROR_SUCCESS) return 0;
	wchar_t wbuffer[PATH_MAX];
	if(RegQueryValueEx(hKey, L"Name", NULL, NULL, (unsigned char *)wbuffer, &DataSize) != ERROR_SUCCESS) {
		RegCloseKey(hKey);
		return 0;
	}
	wbuffer[PATH_MAX] = 0;
	RegCloseKey(hKey);
	unsigned long int len = wcslen(wbuffer) * 2;
	if(*size < len) {
		*size = len;
		SetLastError(ERROR_BUFFER_OVERFLOW);
		return 0;
	}
	*size = len;
	//char *r = malloc(len * sizeof(char));
	wcstombs(buffer, wbuffer, len);
	return 1;
}

char *CeGetApplicationPath() {
	wchar_t wname[PATH_MAX];
	/*int r = */GetModuleFileNameW(NULL, wname, sizeof(wname)/sizeof(wname[0]));
	size_t len = wcslen(wname) * 2 - 1;
	char name[len];
	wcstombs(memset(name, 0, len), wname, len);
	int i = len - 2, s = 0;
	char *path = malloc((len - 1) * sizeof(char));
	for(; i>=0; i--) {
		if(name[i] == '/' || name[i] == '\\') {
			if(!s) path[i+1] = 0;
			s = 1;
			name[i] = '/';
		}
		if(s) path[i] = name[i];
	}
	return path;
}

char *PathToAbsolutePath(char *path) {
	if(path == NULL) return NULL;
	if(path[0] == '/' || path[0] == '\\') return path;
	char *appath = CeGetApplicationPath();
	size_t len = strlen(appath);
	memmove(path + len, path, strlen(path) + 1);
	strncpy(path, appath, len);
	free(appath);
	return path;
}