simple_shell/builtin_functions.c at main · adewuyito/simple_shell · GitHub

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#include "shell.h"
#include "symtab.h"

/**
 * dump - Dump the symbol table
 * @cmd: The command data
 *
 * Return: 0
 */
int dump(UCommand * cmd __attribute__((unused)))
{
	dump_local_symtab();
	return (0);
}

/**
 * exit_shell - Exit the shell
 * @cmd: The command data
 *
 * Return: 0 on success, 1 on failure
 */
int exit_shell(UCommand *cmd)
{
	int check;

	if (cmd->ac > 1)
	{
		check = _erratoi(cmd->av[1]);
		if (check == -1)
		{
			char buffer[20];

			cmd->status = 2;
			print(cmd->shell_name, STDERR_FILENO);
			print(": ", STDERR_FILENO);
			print(itoa(cmd->run_count, buffer, 10), STDERR_FILENO);
			print(": exit: Illegal number: ", STDERR_FILENO);
			print(cmd->av[1], STDERR_FILENO);
			print("\n", STDERR_FILENO);
			return (1);
		}
		cmd->exit_status = _erratoi(cmd->av[1]);
		cmd->exit_state = 1;
	}
	else if (cmd->ac == 1)
	{
		cmd->exit_status = 0;
		cmd->exit_state = 1;
	}

	return (0);
}

/**
 * _cd - Change the current working directory
 * @cmd: The command data
 *
 * Return: 0 on success, 1 on failure
 */
int _cd(UCommand *cmd)
{
	ST_entry *entry;
	int ret;
	char *home = NULL, *oldpwd = NULL, *pwd = NULL, buf[1024];

	entry = get_symtab_entry("PWD");
	if (entry == NULL)
		return (1);
	pwd = entry->val;
	entry = get_symtab_entry("HOME");
	if (entry == NULL)
		return (1);
	home = entry->val;
	if (!cmd->av[1])
		ret = chdir(home);
	else if (_strcmp(cmd->av[1], "-") == 0)
	{
		entry = get_symtab_entry("OLDPWD");
		if (!entry)
		{
			print(cmd->av[2], STDOUT_FILENO), print("\n", STDOUT_FILENO);
			return (1);
		}
		oldpwd = entry->val;
		print(oldpwd, STDOUT_FILENO), print("\n", STDOUT_FILENO);
		ret = chdir(oldpwd);
	}
	else
		ret = chdir(cmd->av[1]);
	if (ret == -1)
	{
		print_custom_error(cmd, "can't cd to "), print("\n", STDERR_FILENO);
		return (1);
	}
	else
	{
		symtab_entry_setval(get_symtab_entry("OLDPWD"), pwd);
		symtab_entry_setval(get_symtab_entry("PWD"), getcwd(buf, 1024));
	}

	return (ret);
}

/**
 * remove_comments - Remove comment
 * @cmd: string to check
 *
 * Return: The changed command
 */
char **remove_comments(char **cmd)
{
	int i = 0;

	for (i = 0; cmd[i] != NULL; i++)
	{
		if ((cmd[i][0] == '#') || (strcmp(cmd[i], "#") == 0))
		{
			int j;

			for (j = i; cmd[j] != NULL; j++)
			{
				free(cmd[j]);
				cmd[j] = NULL;
			}
		}
	}

	return (cmd);
}

/**
 * _erratoi - converts a string to an integer
 * @s: the string to be converted
 * Return: 0 if no numbers in string, converted number otherwise
 *       -1 on error
 */
int _erratoi(char *s)
{
	int i = 0;
	unsigned long int result = 0;

	if (*s == '+')
		s++; /* TODO: why does this make main return 255? */
	for (i = 0; s[i] != '\0'; i++)
	{
		if (s[i] >= '0' && s[i] <= '9')
		{
			result *= 10;
			result += (s[i] - '0');
			if (result > __INT_MAX__)
				return (-1);
		}
		else
			return (-1);
	}
	return (result);
}