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/* winf.cc
Copyright 2003, 2004, 2005, 2006, 2008, 2009, 2013, 2014, 2015 Red Hat, Inc.
This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */
#include "winsup.h"
#include <stdlib.h>
#include "cygerrno.h"
#include "security.h"
#include "path.h"
#include "fhandler.h"
#include "dtable.h"
#include "cygheap.h"
#include "tls_pbuf.h"
#include "winf.h"
#include "sys/cygwin.h"
void
linebuf::finish (bool cmdlenoverflow_ok)
{
if (!ix)
add ("", 1);
else
{
if (ix-- > MAXCYGWINCMDLEN && cmdlenoverflow_ok)
ix = MAXCYGWINCMDLEN - 1;
buf[ix] = '\0';
}
}
void
linebuf::add (const char *what, int len)
{
size_t newix = ix + len;
if (newix >= alloced || !buf)
{
alloced += LINE_BUF_CHUNK + newix;
buf = (char *) realloc (buf, alloced + 1);
}
memcpy (buf + ix, what, len);
ix = newix;
buf[ix] = '\0';
}
void
linebuf::prepend (const char *what, int len)
{
int buflen;
size_t newix;
if ((newix = ix + len) >= alloced)
{
alloced += LINE_BUF_CHUNK + newix;
buf = (char *) realloc (buf, alloced + 1);
buf[ix] = '\0';
}
if ((buflen = strlen (buf)))
memmove (buf + len, buf, buflen + 1);
else
buf[newix] = '\0';
memcpy (buf, what, len);
ix = newix;
}
bool
linebuf::fromargv (av& newargv, const char *real_path, bool cmdlenoverflow_ok)
{
bool success = true;
for (int i = 0; i < newargv.argc; i++)
{
char *p = NULL;
const char *a;
a = i ? newargv[i] : (char *) real_path;
int len = strlen (a);
if (len != 0 && !strpbrk (a, " \t\n\r\""))
add (a, len);
else
{
add ("\"", 1);
/* Handle embedded special characters " and \.
A " is always preceded by a \.
A \ is not special unless it precedes a ". If it does,
then all preceding \'s must be doubled to avoid having
the Windows command line parser interpret the \ as quoting
the ". This rule applies to a string of \'s before the end
of the string, since cygwin/windows uses a " to delimit the
argument. */
for (; (p = strpbrk (a, "\"\\")); a = ++p)
{
add (a, p - a);
/* Find length of string of backslashes */
int n = strspn (p, "\\");
if (!n)
add ("\\\"", 2); /* No backslashes, so it must be a ".
The " has to be protected with a backslash. */
else
{
add (p, n); /* Add the run of backslashes */
/* Need to double up all of the preceding
backslashes if they precede a quote or EOS. */
if (!p[n] || p[n] == '"')
add (p, n);
p += n - 1; /* Point to last backslash */
}
}
if (*a)
add (a);
add ("\"", 1);
}
add (" ", 1);
}
finish (cmdlenoverflow_ok);
if (ix >= MAXWINCMDLEN)
{
debug_printf ("command line too long (>32K), return E2BIG");
set_errno (E2BIG);
success = false;
}
return success;
}
int
av::unshift (const char *what)
{
char **av;
av = (char **) crealloc (argv, (argc + 2) * sizeof (char *));
if (!av)
return 0;
argv = av;
memmove (argv + 1, argv, (argc + 1) * sizeof (char *));
*argv = cstrdup1 (what);
calloced++;
argc++;
return 1;
}
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