/*
 * Copyright 2005-2007, Ingo Weinhold, bonefish@cs.tu-berlin.de.
 * Distributed under the terms of the MIT License.
 */

#include "fs_shell_command.h"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>


static void
add_char(char *&buffer, int &bufferSize, char c)
{
        if (bufferSize <= 0) {
                fprintf(stderr, "Error: Command line too long\n");
                exit(1);
        }

        *buffer = c;
        buffer++;
        bufferSize--;
}


static void
prepare_command_string(const char *const *argv, int argc, char *buffer,
                int bufferSize)
{
        for (int argi = 0; argi < argc; argi++) {
                const char *arg = argv[argi];

                if (argi > 0)
                        add_char(buffer, bufferSize, ' ');

                while (*arg) {
                        if (strchr(" \"'\\", *arg))
                                add_char(buffer, bufferSize, '\\');
                        add_char(buffer, bufferSize, *arg);
                        arg++;
                }
        }

        add_char(buffer, bufferSize, '\0');
}


int
main(int argc, const char *const *argv)
{
        if (argc < 2) {
                fprintf(stderr, "Error: No command given.\n");
                exit(1);
        }

        if (strcmp(argv[1], "--uses-fifos") == 0)
                exit(gUsesFifos ? 0 : 1);

        // prepare the command string
        char command[102400];
        prepare_command_string(argv + 1, argc - 1, command, sizeof(command));

        // send the command
        int result;
        if (!send_external_command(command, &result))
                exit(1);

        // evaluate result
        if (result != 0) {
                fprintf(stderr, "Error: Command failed: %s\n", strerror(result));
                fprintf(stderr, "Error: Command was:\n  %s\n", command);
                exit(1);
        }

        return 0;
}