CSE_shell/cd.c at master · hetav45/CSE_shell · GitHub

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#include "shell.h"  // HOME_DIR
#include <unistd.h> // chdir
#include <stdio.h>  // perror
#include <string.h> // strlen

void exec_cd(char *dir_path)
{

    // no arguments; go to home_dir
    if (dir_path == NULL)
    {

        if (chdir(HOME_DIR) < 0)
        {
            perror("");
            return;
        }

        return;
    }

    // remove quotes : why do they not work with chdir ?
    if (dir_path[0] == '"' || dir_path[0] == '\'')
    {
        if (strlen(dir_path) > 0)
        {
            dir_path[strlen(dir_path) - 1] = '\0';
            dir_path = &dir_path[1];
        }
    }

    // telda expansion
    if (dir_path[0] == '~')
    {

        // first change the curr_dir to home
        if (chdir(HOME_DIR) < 0)
        {
            perror("");
            return;
        }

        // now replace ~ by . and proceed normally
        dir_path[0] = '.';
    }

    if (chdir(dir_path) < 0)
    {
        perror("");
        return;
    }
}