main.c

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#include "interactive.h"
#include "pipeline.h"
 
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/io.h>
#include <sys/proc.h>
 
static uint64_t cmdline_read(char* buffer, uint64_t size)
{
    uint64_t index = 0;
    buffer[0] = '\0';
    while (1)
    {
        char chr;
        if (read(STDIN_FILENO, &chr, 1) == 0)
        {
            return ERR;
        }
        else if (chr == '\n')
        {
            buffer[index] = '\0';
            return 0;
        }
        if (index + 1 < size)
        {
            buffer[index++] = chr;
        }
    }
}
 
static void join_args(char* buffer, uint64_t size, int argc, char* argv[])
{
    buffer[0] = '\0';
    uint64_t pos = 0;
 
    for (int i = 1; i < argc && pos < size - 1; i++)
    {
        if (i > 1 && pos < size - 1)
        {
            buffer[pos++] = ' ';
        }
 
        char* arg = argv[i];
        while (*arg && pos < size - 1)
        {
            buffer[pos++] = *arg++;
        }
    }
 
    buffer[pos] = '\0';
}
 
int execute_command(const char* cmdline)
{
    pipeline_t pipeline;
    if (pipeline_init(&pipeline, cmdline) == ERR)
    {
        return EXIT_FAILURE;
    }
    return pipeline_execute(&pipeline) == ERR ? EXIT_FAILURE : EXIT_SUCCESS;
}
 
int main(int argc, char* argv[])
{
    if (argc > 1)
    {
        char cmdline[MAX_PATH];
        join_args(cmdline, MAX_PATH, argc, argv);
        return execute_command(cmdline);
    }
    else
    {
        return interactive_shell();
    }
}