findPathFuncs.c

#include "holberton.h"

/**
 * getKeyValue - gets pointer to the value string
 *
 * @key: key we want to find
 * Return: pointer to key value after the =
 */
char *getKeyValue(char *key)
{
	int i = 0;
	char *tmp = NULL;

	while (environ[i] && tmp == NULL)
	{
		tmp = _strstr(environ[i], key);
		i++;
	}
	tmp = _strstr(tmp, "="), tmp++;
	return (tmp);
}
/**
 * getPathArgs - finds command path
 *
 * @prog: command we want to run
 * Return: executable path of command
 */
char *getPathArgs(char *prog)
{
	char *tmp;
	char **tmp_args;
	char *tmp_env;

	tmp = getKeyValue("PATH");
	tmp_env = _stralloc(1, tmp);
	tmp_args = getToken(&tmp_env, ":");
	tmp = get_x_args(tmp_args, prog);

	free(tmp_env);
	free(tmp_args);
	return (tmp);
}
/**
 * get_x_args - tests if path is executable
 *
 * @env_paths: path stings
 * @program: command
 * Return: string with full path
 */
char *get_x_args(char **env_paths, char *program)
{
	int i = 1;
	char *tmp;

	tmp = _stralloc(3, env_paths[0], "/", program);
	while (access(tmp, X_OK) == -1 && env_paths[i] != NULL)
	{
		free(tmp);
		tmp = _stralloc(3, env_paths[i], "/", program);
		i++;
	}
	if (env_paths[i] == NULL)
		return (NULL);
	else
		return (tmp);
}

/**
 * _stralloc - allocates and concats a string without realloc
 * @count: number of arguements
 * Return: the concat and allocated string
 */
char *_stralloc(int count, ...)
{
	va_list list;
	char *tmp_arg;
	char *tmp_ptr;
	char *tmp_return;
	int sLen;
	int aLen;

	va_start(list, count);

	tmp_arg = va_arg(list, char *), count--;
	aLen = _strlen(tmp_arg);

	tmp_return = malloc(sizeof(char) * aLen + 1);
	if (tmp_return == NULL)
		exit(EXIT_FAILURE);

	_strcpy(tmp_return, tmp_arg);

	while (count != 0)
	{
		tmp_arg = va_arg(list, char *), count--;
		sLen = _strlen(tmp_return), aLen = _strlen(tmp_arg);

		tmp_ptr = malloc(sizeof(char) * (sLen + aLen) + 1);
		if (tmp_ptr == NULL)
			perror("check if second malloc failed");

		if (tmp_return != NULL)
			_strcpy(tmp_ptr, tmp_return), free(tmp_return);
		_strcat(tmp_ptr, tmp_arg), tmp_return = tmp_ptr;
	}

	va_end(list);
	return (tmp_return);
}