root/tasks/task1.c

DEFINITIONS

1. main

#include "kstructs.h"
#include "memory.h"
#include "syscalls.h"
#include "lib.h"
#include "console.h"

int main(int argc, char **argv)
{
    int column = 0;
    char commandline[81];
    char buffer[512];
    char name[81];
    char environment[81];
    int i;

    if (argc == 2)
        if (argv[1][0] >= '0' && argv[1][0] <= '3') {
            i = argv[1][0] - '0';
            printf("%c#%d", ESC, i);
        }
    printf("%c[2J", ESC);
    printf("IanOS Version 0.1.3 - 2012  Console %d\n#> ", i + 1);
    name[80] = environment[80] = 0;
    for (i = 0; i < 80; i++)
        commandline[i] = ' ';

    while (1) {
        char c = getchar();

        switch (c) {
        case BACKSPACE:
            if (column > 0) {
                printf("\b \b");
                commandline[column--] = 0;
            }
            break;

        case CR:
            commandline[column] = 0;
            column = 0;

            i = 0;
            while (commandline[i] != ' ') {
                name[i] = commandline[i];
                i++;
            }
            name[i] = 0;

            // Convert name[] to upper case.
            i = -1;
            while (name[++i]) {
                if (name[i] >= 'a' & name[i] <= 'z')
                    name[i] = name[i] - 0x20;
            }

            for (i = 0; i < 80; i++)
                environment[i] = commandline[i];

            printf(" \n");

            // Process "CD" command;
            if (name[0] == 'C' && name[1] == 'D' && name[2] == 0) {
                char directory[80];
                for (i = 0; i < 77; i++)
                    if (environment[i + 3] != ' ')
                        directory[i] =
                            environment[i + 3];
                    else
                        break;
                directory[i] = 0;
                int dir = chdir(directory);
                if (dir == -1)
                    printf("Directory not found!\n");
            } else {
                int pid = fork();
                if (!pid)
                {
                    if (execve(name, environment))
                    {
                        printf("Command not found\n");
                        exit();
                    }
                }
                else
                    waitpid(pid);
            }

            printf("#> ");

            // Clear commandline[]
            for (i = 0; i < 80; i++) {
                commandline[i] = ' ';
            }
            break;

        case 4:     // Down arrow
        case 12:    // Left arrow
        case 18:    // Right arrow
        case 21:    // Up arrow
            break;

        default:
            commandline[column++] = c;
            printf("%c", c);
            break;
        }
    }
    return (0);
}