/* /lib/file.c
* From the Dead Souls Mud Library
* Handles clean file I/O without need for the driver
* Created by Descartes of Borg 961219
* Version: @(#) file.c 1.2@(#)
* Last Modified: 96/12/19
*/
#include <lib.h>
#include <runtime_config.h>
inherit LIB_CLEAN;
private static string FileName = 0;
private static int LinePointer = 0;
private static int MaxBytes = get_config(__MAX_BYTE_TRANSFER__);
private static int MaxFile = get_config(__MAX_READ_FILE_SIZE__);
private static int TempFile = 0;
int isDirectory() {
return (file_size(FileName) == -2);
}
int isFile() {
return (file_size(FileName) > -1 );
}
int isTemporary() {
return TempFile;
}
buffer GetBuffer() {
int size = file_size(FileName);
int count = (size/MaxBytes) + 1;
buffer data = allocate_buffer(size);
if( !FileName ) {
return data;
}
else if( size < 0 ) {
return 0;
}
for(int i=0; i<count; i++) {
int length, ptr;
ptr = i * MaxBytes;
if( size - ptr > MaxBytes ) {
length = MaxBytes;
}
else {
length = size - ptr;
}
write_buffer(data, ptr, read_buffer(FileName, ptr, length));
}
return data;
}
buffer GetBytes(int start, int length) {
return read_buffer(FileName, start, length);
}
string GetCharacters(int start, int length) {
return read_bytes(FileName, start, length);
}
string array GetDirectoryList() {
if( !isDirectory() ) {
return 0;
}
return get_dir(FileName + "/");
}
mixed array GetDirectoryShort() {
if( !isDirectory() ) {
return 0;
}
return get_dir(FileName + "/", -1);
}
string GetFileName() {
if( file_size(FileName) == -2 ) {
return FileName + "/";
}
else {
return FileName;
}
}
int GetLastModified() {
if( file_size(FileName) == -1 ) {
return 0;
}
else {
return get_dir(FileName, -1)[0][2];
}
}
string GetLine() {
return read_file(FileName, LinePointer++, 1);
}
varargs string GetLines(int arg1, int arg2) {
int start = arg1;
int count = arg2;
if( undefinedp(arg2) ) {
start = LinePointer;
count = arg1;
LinePointer = LinePointer + count;
}
return read_file(FileName, start, count);
}
int GetSize() {
return file_size(FileName);
}
string GetString() {
int size = file_size(FileName);
int count = (size/MaxFile) + 1;
string data = "";
if( !FileName ) {
return data;
}
else if( size < 0 ) {
return 0;
}
for(int i=0; i<count; i++) {
int length, ptr;
ptr = i * MaxFile;
if( size - ptr > MaxFile ) {
length = MaxFile;
}
else {
length = size - ptr;
}
data += read_bytes(FileName, ptr, length);
}
return data;
}
mixed eventCreateDirectory() {
if( isFile() ) {
return "File exists.";
}
else if( isDirectory() ) {
return "Directory exists.";
}
else {
if( mkdir(FileName) ) {
return 1;
}
else {
return 0;
}
}
}
mixed eventDelete() {
if( isDirectory() ) {
if( rmdir(FileName) ) {
return 1;
}
else {
return 0;
}
}
else if( isFile() ) {
if( rm(FileName) ) {
return 1;
}
else {
return 0;
}
}
else {
return "No such file or directory.";
}
}
int eventDestruct() {
if( isTemporary() ) {
eventDelete();
}
return clean::eventDestruct();
}
varargs mixed eventRename(string name, int clobber) {
object file = new(LIB_FILE, name);
object tmpfile = 0;
if( file->isFile() || file->isDirectory() ) {
mixed tmp;
if( !clobber ) {
return "File or directory already exists.";
}
tmpfile = new(LIB_FILE);
tmp = file->eventRename(tmpfile->GetFileName());
if( tmp != 1 ) {
if( !tmp ) {
tmp = "";
}
tmp = "Failed to make temp file: " + tmp;
return tmp;
}
}
if( rename(FileName, name) ) {
if( tmpfile ) {
mixed tmp = tmpfile->eventRename(name);
if( tmp != 1 ) {
if( !tmp ) {
tmp = "";
}
return "Failed to restore destination!! Data lost: " + tmp;
}
}
return 0;
}
if( tmpfile ) {
tmpfile->eventDelete();
}
FileName = name;
while( strlen(FileName) && FileName[<1] == '/' ) {
FileName = FileName[0..<2];
}
return 1;
}
mixed eventWrite(mixed val) {
int size = sizeof(val);
int max = (bufferp(val) ? MaxBytes : MaxFile);
int count = (size/max) + 1;
if( file_size(FileName) == -2 ) {
return "File is a directory.";
}
for(int i = 0; i<count; i++) {
int ptr = i * max;
int length;
if( size - ptr > max ) {
length = max;
}
else {
length = size - ptr;
}
if( bufferp(val) ) {
write_buffer(FileName, ptr, read_buffer(val, ptr, length));
}
else {
write_bytes(FileName, ptr, val[ptr..(ptr+length-1)]);
}
}
return 1;
}
varargs static void create(string file) {
if( !clonep() ) {
return;
}
if( FileName ) {
error("Odd, but illegal file name rename attempt.\n");
}
if( !file ) {
int t = time();
int count = 0;
file = DIR_TMP "/" + t;
while( file_size(file) != -1 ) {
if( count++ > 100 ) {
error("Unable to generate temporary file.");
}
t++;
file = DIR_TMP "/" + t;
}
write_file(file, "");
TempFile = 1;
}
else {
SetNoClean(1);
}
FileName = file;
while( strlen(FileName) && FileName[<1] == '/' ) {
if( strlen(FileName) == 1 ) {
FileName = 0;
error("Invalid file name.\n");
}
FileName = FileName[0..<2];
}
}
