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/* Copyright (C) 2023 Mike Fleetwood
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "common.h"
#include <iostream>
#include <sstream>
#include <string>
#include <iomanip>
#include <stddef.h>
#include <ctype.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
namespace GParted
{
// Format up to BinaryStringChunkSize (16) bytes of binary data ready for printing as:
// Hex offset ASCII text Hex bytes
// "0x000000000 \"ABCDEFGHabcdefgh\" 41 42 43 44 45 46 47 48 61 62 63 64 65 66 67 68"
std::string binary_string_to_print(size_t offset, const char* s, size_t len)
{
std::ostringstream result;
result << "0x";
result.fill('0');
result << std::setw(8) << std::hex << std::uppercase << offset << " \"";
size_t i;
for (i = 0; i < BinaryStringChunkSize && i < len; i++)
result.put((isprint(s[i])) ? s[i] : '.');
result.put('\"');
if (len > 0)
{
for (; i < BinaryStringChunkSize; i++)
result.put(' ');
result.put(' ');
for (i = 0 ; i < BinaryStringChunkSize && i < len; i++)
result << " "
<< std::setw(2) << std::hex << std::uppercase
<< (unsigned int)(unsigned char)s[i];
}
return result.str();
}
// Re-execute current executable using xvfb-run so that it provides a virtual X11 display.
static void exec_using_xvfb_run(int argc, char** argv)
{
// argc+2 = Space for "xvfb-run" command, existing argc strings plus nullptr.
size_t size = sizeof(char*) * (argc+2);
char** new_argv = (char**)malloc(size);
if (new_argv == nullptr)
{
fprintf(stderr, "Failed to allocate %lu bytes of memory. errno=%d,%s\n",
(unsigned long)size, errno, strerror(errno));
exit(EXIT_FAILURE);
}
new_argv[0] = strdup("xvfb-run");
if (new_argv[0] == nullptr)
{
fprintf(stderr, "Failed to allocate %lu bytes of memory. errno=%d,%s\n",
(unsigned long)strlen(new_argv[0])+1, errno, strerror(errno));
exit(EXIT_FAILURE);
}
// Copy argv pointers including final nullptr.
for (size_t i = 0; i <= (unsigned)argc; i++)
new_argv[i+1] = argv[i];
execvp(new_argv[0], new_argv);
fprintf(stderr, "Failed to execute '%s %s ...'. errno=%d,%s\n", new_argv[0], new_argv[1],
errno, strerror(errno));
exit(EXIT_FAILURE);
}
// Ensure there is an X11 display, providing a virtual one if needed.
void ensure_x11_display(int argc, char** argv)
{
const char* display = getenv("DISPLAY");
if (display == nullptr)
{
printf("DISPLAY environment variable unset. Executing 'xvfb-run %s ...'\n", argv[0]);
exec_using_xvfb_run(argc, argv);
}
printf("DISPLAY=\"%s\"\n", display);
}
} //GParted
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