/
file.d
330 lines (307 loc) · 9.04 KB
/
file.d
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/**
* Compiler implementation of the D programming language
* http://dlang.org
*
* Copyright: Copyright (c) 1999-2017 by The D Language Foundation, All Rights Reserved
* Authors: Walter Bright, http://www.digitalmars.com
* License: $(LINK2 http://www.boost.org/LICENSE_1_0.txt, Boost License 1.0)
* Source: $(LINK2 https://github.com/dlang/dmd/blob/master/src/dmd/root/file.d, root/_file.d)
*/
module dmd.root.file;
// Online documentation: https://dlang.org/phobos/dmd_root_file.html
import core.stdc.errno;
import core.stdc.stdio;
import core.stdc.stdlib;
import core.sys.posix.fcntl;
import core.sys.posix.unistd;
import core.sys.windows.windows;
import dmd.root.filename;
import dmd.root.rmem;
/***********************************************************
*/
struct File
{
int _ref; // != 0 if this is a reference to someone else's buffer
ubyte* buffer; // data for our file
size_t len; // amount of data in buffer[]
const(FileName)* name; // name of our file
nothrow:
extern (D) this(const(char)* n)
{
_ref = 0;
buffer = null;
len = 0;
name = new FileName(n);
}
extern (C++) static File* create(const(char)* n)
{
return new File(n);
}
extern (D) this(const(FileName)* n)
{
_ref = 0;
buffer = null;
len = 0;
name = n;
}
extern (C++) ~this()
{
if (buffer)
{
if (_ref == 0)
mem.xfree(buffer);
version (Windows)
{
if (_ref == 2)
UnmapViewOfFile(buffer);
}
}
}
extern (C++) const(char)* toChars() pure
{
return name.toChars();
}
/*************************************
*/
extern (C++) bool read()
{
if (len)
return false; // already read the file
import core.stdc.string : strcmp;
const(char)* name = this.name.toChars();
if (strcmp(name, "__stdin.d") == 0)
{
/* Read from stdin */
enum bufIncrement = 128 * 1024;
size_t pos = 0;
size_t sz = bufIncrement;
if (!_ref)
.free(buffer);
buffer = null;
L1: for (;;)
{
buffer = cast(ubyte*).realloc(buffer, sz + 2); // +2 for sentinel
if (!buffer)
{
printf("\tmalloc error, errno = %d\n", errno);
break L1;
}
// Fill up buffer
do
{
assert(sz > pos);
size_t rlen = fread(buffer + pos, 1, sz - pos, stdin);
pos += rlen;
if (ferror(stdin))
{
printf("\tread error, errno = %d\n", errno);
break L1;
}
if (feof(stdin))
{
// We're done
assert(pos < sz + 2);
len = pos;
buffer[pos] = '\0';
buffer[pos + 1] = '\0';
return false;
}
} while (pos < sz);
// Buffer full, expand
sz += bufIncrement;
}
.free(buffer);
buffer = null;
len = 0;
return true;
}
version (Posix)
{
size_t size;
stat_t buf;
ssize_t numread;
//printf("File::read('%s')\n",name);
int fd = open(name, O_RDONLY);
if (fd == -1)
{
//printf("\topen error, errno = %d\n",errno);
goto err1;
}
if (!_ref)
{
.free(buffer);
buffer = null;
}
_ref = 0; // we own the buffer now
//printf("\tfile opened\n");
if (fstat(fd, &buf))
{
printf("\tfstat error, errno = %d\n", errno);
goto err2;
}
size = cast(size_t)buf.st_size;
buffer = cast(ubyte*).malloc(size + 2);
if (!buffer)
{
printf("\tmalloc error, errno = %d\n", errno);
goto err2;
}
numread = .read(fd, buffer, size);
if (numread != size)
{
printf("\tread error, errno = %d\n", errno);
goto err2;
}
if (close(fd) == -1)
{
printf("\tclose error, errno = %d\n", errno);
goto err;
}
len = size;
// Always store a wchar ^Z past end of buffer so scanner has a sentinel
buffer[size] = 0; // ^Z is obsolete, use 0
buffer[size + 1] = 0;
return false;
err2:
close(fd);
err:
.free(buffer);
buffer = null;
len = 0;
err1:
return true;
}
else version (Windows)
{
import dmd.root.filename: extendedPathThen;
DWORD size;
DWORD numread;
// work around Windows file path length limitation
// (see documentation for extendedPathThen).
HANDLE h = name.extendedPathThen!
(p => CreateFileW(p,
GENERIC_READ,
FILE_SHARE_READ,
null,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN,
null));
if (h == INVALID_HANDLE_VALUE)
goto err1;
if (!_ref)
.free(buffer);
_ref = 0;
size = GetFileSize(h, null);
buffer = cast(ubyte*).malloc(size + 2);
if (!buffer)
goto err2;
if (ReadFile(h, buffer, size, &numread, null) != TRUE)
goto err2;
if (numread != size)
goto err2;
if (!CloseHandle(h))
goto err;
len = size;
// Always store a wchar ^Z past end of buffer so scanner has a sentinel
buffer[size] = 0; // ^Z is obsolete, use 0
buffer[size + 1] = 0;
return 0;
err2:
CloseHandle(h);
err:
.free(buffer);
buffer = null;
len = 0;
err1:
return true;
}
else
{
assert(0);
}
}
/*********************************************
* Write a file.
* Returns:
* false success
*/
extern (C++) bool write()
{
version (Posix)
{
ssize_t numwritten;
const(char)* name = this.name.toChars();
int fd = open(name, O_CREAT | O_WRONLY | O_TRUNC, (6 << 6) | (4 << 3) | 4);
if (fd == -1)
goto err;
numwritten = .write(fd, buffer, len);
if (len != numwritten)
goto err2;
if (close(fd) == -1)
goto err;
return false;
err2:
close(fd);
.remove(name);
err:
return true;
}
else version (Windows)
{
import dmd.root.filename: extendedPathThen;
DWORD numwritten; // here because of the gotos
const(char)* name = this.name.toChars();
// work around Windows file path length limitation
// (see documentation for extendedPathThen).
HANDLE h = name.extendedPathThen!
(p => CreateFileW(p,
GENERIC_WRITE,
0,
null,
CREATE_ALWAYS,
FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN,
null));
if (h == INVALID_HANDLE_VALUE)
goto err;
if (WriteFile(h, buffer, cast(DWORD)len, &numwritten, null) != TRUE)
goto err2;
if (len != numwritten)
goto err2;
if (!CloseHandle(h))
goto err;
return false;
err2:
CloseHandle(h);
DeleteFileA(name);
err:
return true;
}
else
{
assert(0);
}
}
/* Set buffer
*/
extern (C++) void setbuffer(void* buffer, size_t len)
{
this.buffer = cast(ubyte*)buffer;
this.len = len;
}
// delete file
extern (C++) void remove()
{
version (Posix)
{
int dummy = .remove(this.name.toChars());
}
else version (Windows)
{
DeleteFileA(this.name.toChars());
}
else
{
assert(0);
}
}
}