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response.d
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response.d
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/**
* Compiler implementation of the D programming language
* http://dlang.org
* This file is not shared with other compilers which use the DMD front-end.
*
* Copyright: Copyright (C) 1999-2018 by The D Language Foundation, All Rights Reserved
* Some portions copyright (c) 1994-1995 by Symantec
* Authors: $(LINK2 http://www.digitalmars.com, Walter Bright)
* 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/response.d, root/_response.d)
* Documentation: https://dlang.org/phobos/dmd_root_response.html
* Coverage: https://codecov.io/gh/dlang/dmd/src/master/src/dmd/root/response.d
*/
module dmd.root.response;
import core.stdc.stdio;
import core.stdc.stdlib;
import core.stdc.string;
import dmd.root.file;
import dmd.root.filename;
/*********************************
* #include <stdlib.h>
* int response_expand(int *pargc,char ***pargv);
*
* Expand any response files in command line.
* Response files are arguments that look like:
* @NAME
* The name is first searched for in the environment. If it is not
* there, it is searched for as a file name.
* Arguments are separated by spaces, tabs, or newlines. These can be
* imbedded within arguments by enclosing the argument in '' or "".
* Recursively expands nested response files.
*
* To use, put the line:
* response_expand(&argc,&argv);
* as the first executable statement in main(int argc, char **argv).
* argc and argv are adjusted to be the new command line arguments
* after response file expansion.
*
* Digital Mars's MAKE program can be notified that a program can accept
* long command lines via environment variables by preceding the rule
* line for the program with a *.
*
* Returns:
* 0 success
* !=0 failure (argc, argv unchanged)
*/
bool response_expand(Strings* args)
{
const(char)* cp;
int recurse = 0;
for (size_t i = 0; i < args.dim;)
{
cp = (*args)[i];
if (*cp != '@')
{
++i;
continue;
}
args.remove(i);
char* buffer;
char* bufend;
cp++;
if (auto p = getenv(cp))
{
buffer = strdup(p);
if (!buffer)
goto noexpand;
bufend = buffer + strlen(buffer);
}
else
{
auto f = File(cp);
if (f.read())
goto noexpand;
f._ref = 1;
buffer = cast(char*)f.buffer;
bufend = buffer + f.len;
}
// The logic of this should match that in setargv()
int comment = 0;
for (auto p = buffer; p < bufend; p++)
{
char* d;
char c, lastc;
ubyte instring;
int num_slashes, non_slashes;
switch (*p)
{
case 26:
/* ^Z marks end of file */
goto L2;
case 0xD:
case '\n':
if (comment)
{
comment = 0;
}
goto case;
case 0:
case ' ':
case '\t':
continue;
// scan to start of argument
case '#':
comment = 1;
continue;
case '@':
if (comment)
{
continue;
}
recurse = 1;
goto default;
default:
/* start of new argument */
if (comment)
{
continue;
}
args.insert(i, p);
++i;
instring = 0;
c = 0;
num_slashes = 0;
for (d = p; 1; p++)
{
lastc = c;
if (p >= bufend)
{
*d = 0;
goto L2;
}
c = *p;
switch (c)
{
case '"':
/*
Yes this looks strange,but this is so that we are
MS Compatible, tests have shown that:
\\\\"foo bar" gets passed as \\foo bar
\\\\foo gets passed as \\\\foo
\\\"foo gets passed as \"foo
and \"foo gets passed as "foo in VC!
*/
non_slashes = num_slashes % 2;
num_slashes = num_slashes / 2;
for (; num_slashes > 0; num_slashes--)
{
d--;
*d = '\0';
}
if (non_slashes)
{
*(d - 1) = c;
}
else
{
instring ^= 1;
}
break;
case 26:
*d = 0; // terminate argument
goto L2;
case 0xD:
// CR
c = lastc;
continue;
// ignore
case '@':
recurse = 1;
goto Ladd;
case ' ':
case '\t':
if (!instring)
{
case '\n':
case 0:
*d = 0; // terminate argument
goto Lnextarg;
}
goto default;
default:
Ladd:
if (c == '\\')
num_slashes++;
else
num_slashes = 0;
*d++ = c;
break;
}
}
break;
}
Lnextarg:
}
L2:
}
if (recurse)
{
/* Recursively expand @filename */
if (response_expand(args))
goto noexpand;
}
return false; /* success */
noexpand:
/* error */
/* BUG: any file buffers are not free'd */
return true;
}