42sh/src/expansion/expansion.c

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

#include "../ast/ast.h"

struct ast_cmd *expand(struct ast_cmd *cmd)
{
    if (cmd == NULL)
        return NULL;

    bool in_quotes = false;
    char *str;
    size_t len;
    struct list *l = cmd->cmd;

    while (l != NULL)
    {
        in_quotes = false;
        str = (char *)l->data;
        len = strlen(str);

        for (size_t i = 0; str[i] != '\0'; i++)
        {
            if (in_quotes)
            {
                // do nothing
            }
            else if (str[i] == '\'')
            {
                in_quotes = !in_quotes;
                memmove(&str[i], &str[i + 1], strlen(&str[i + 1]) + 1);
            }
            // else if (str[i] == '$' && str[i + 1] != '\0' && str[i + 1] != '$'
            //          && str[i + 1] != ' ')
            else if (str[i] == '$' && isalnum(str[i + 1]))
            {
                // variable expansion
            }
        }

        if (in_quotes)
        {
            // error: quote not closed
        }

        if (len != strlen(str))
        {
            char *new_str = realloc(str, strlen(str) + 1);
            if (new_str == NULL)
            {
                // error: realloc fail
            }
            l->data = new_str;
        }

        l = l->next;
    }
    return cmd;
}

int main()
{
    printf("Expansion module test\n");
    return 0;
}