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pipex_env_variables.c
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pipex_env_variables.c
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* pipex_env_variables.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: vshchuki <[email protected]> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2024/01/20 17:12:21 by vshchuki #+# #+# */
/* Updated: 2024/02/14 19:50:21 by vshchuki ### ########.fr */
/* */
/* ************************************************************************** */
#include "minishell.h"
/**
* Replaces all consecutive whitespaces to a space char ' '(32).
* Also trims all spaces before and after including next line.
*
* @return new string
*/
char *shift_replace_spaces(char *str)
{
int i;
char *res;
int len;
res = ft_strtrim(str, "\t\n\v\f\r ");
free(str);
i = 0;
while (res[i])
{
if (ft_isspace(res[i]))
{
res[i] = ' ';
if (ft_isspace(res[i + 1]))
{
res[i + 1] = ' ';
len = ft_strlen(&res[i]);
ft_memmove(&res[i], &res[i + 1], len);
i--;
}
}
i++;
}
return (res);
}
/**
* Expands simple env variable in argument string
* @param start a pointer to $ of env variable
* @return new allocated expanded env variable or empty string if env variable
* not found.
*/
static char *expand_simple_var(char *start, t_pipe *data)
{
char *res;
int i;
res = NULL;
i = -1;
while (!res && data->envp[++i])
{
if (ft_strncmp(data->envp[i], start + 1, ft_strlen(start + 1)) == 0
&& (data->envp[i])[ft_strlen(start + 1)] == '=' )
{
res = ft_strdup(data->envp[i] + ft_strlen(start + 1) + 1);
res = shift_replace_spaces(res);
}
}
if (!res)
res = ft_strdup("");
return (res);
}
/**
* Expands environment variables found in the argument string.
* Works with expanding double quoted argument, single quoted and simple.
* If the argument string starts with env variable (simple), the whole string
* will be treated as the env variable name.
* If the argument string is single quoted nothing will happen.
*
* @param str argument string after the shell command is split.
* @return a new allocated string even if there is nothing to expand.
*/
char *expand_env_args(char *str, t_pipe *data)
{
if (!str)
return (ft_strdup(""));
if (*str == '~')
return (expand_simple_var("$HOME", data));
if (*str != '$')
return (ft_strdup(str));
if (str[1] == 0)
return (ft_strdup(str));
if (str[1] == '?')
return (ft_itoa(data->exit_status));
return (expand_simple_var(str, data));
}