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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* u_vars.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: rbousset <marvin@42.fr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2020/02/14 17:19:27 by rbousset #+# #+# */
/* Updated: 2020/02/14 17:19:29 by rbousset ### ########lyon.fr */
/* */
/* ************************************************************************** */
#include <libft.h>
#include <stdlib.h>
#include <stdint.h>
#include "d_define.h"
#include "f_fail.h"
#include "s_destroy.h"
#include "s_lcom.h"
#include "s_struct.h"
static char
*set_rva(const char varname[],
t_msh *msh)
{
char *rvarname;
if (!(rvarname = (char*)malloc((ft_strlen(varname) + 1) * sizeof(char))))
{
lcom_clear(&msh->curr);
s_destroy(msh);
fail_alloc(msh);
}
ft_memcpy((char*)rvarname, (const char*)varname + 1,
ft_strlen(varname + 1));
*(rvarname + ft_strlen(varname + 1)) = '=';
*(rvarname + ft_strlen(varname + 1) + 1) = '\0';
return (rvarname);
}
static char
*dup_env(char *p_env,
char *rvarname,
t_msh *msh)
{
char *varval;
if (!(varval = ft_strdup(p_env)))
{
ft_memdel((void*)&rvarname);
lcom_clear(&msh->curr);
s_destroy(msh);
fail_alloc(msh);
}
ft_memdel((void*)&rvarname);
return (varval);
}
static char
*get_frm_env(char rvarname[],
t_msh *msh)
{
char **p_env;
char *pp_env;
char *varval;
p_env = msh->envp;
while (*p_env)
{
if (!ft_strncmp(rvarname, *p_env, ft_strlen(rvarname)))
{
pp_env = *p_env;
while (*pp_env != '\0' && *pp_env != '=')
pp_env += 1;
if (*pp_env == '=')
pp_env += 1;
varval = dup_env(pp_env, rvarname, msh);
return (varval);
}
p_env += 1;
}
return (NULL);
}
static char
*get_special_var(const char varname[],
t_msh *msh)
{
char *varval;
if (!ft_strncmp(varname, FT_RET_VAR, 3))
{
if (!(varval = ft_uitoa(msh->ret)))
{
lcom_clear(&msh->curr);
s_destroy(msh);
fail_alloc(msh);
}
return (varval);
}
else if (!ft_strncmp(varname, FT_ZER_VAR, 3))
{
if (!(varval = ft_strdup(msh->shname)))
{
lcom_clear(&msh->curr);
s_destroy(msh);
fail_alloc(msh);
}
return (varval);
}
return (NULL);
}
static char
*get_cstm_vr(const char varname[],
t_msh *msh)
{
t_lvars *ptr;
char *varval;
ptr = msh->vars;
while (ptr != NULL &&
ft_strncmp(varname + 1, ptr->name, ft_strlen(varname + 1)) != 0)
{
ptr = ptr->next;
}
if (ptr != NULL)
{
if (!(varval = ft_strdup(ptr->val)))
{
lcom_clear(&msh->curr);
s_destroy(msh);
fail_alloc(msh);
}
return (varval);
}
else
{
return (NULL);
}
}
/*
** char*
** u_get_var_value(const char varname[], t_msh *msh);
**
** DESCRIPTION
** The u_get_var_value() function returns
** a heap-allocated, null-terminated string
** that may later be free'd containing the
** value of the variable varname[] including
** the '$' prefix. NULL is returned if varname[]
** wasn't found.
*/
char
*u_get_var_value(const char varname[],
t_msh *msh)
{
/* TODO: check behaviour on empty vars -> "QWE=" */
/* TODO: add support for global variables -> "$hey $nigga..." */
char *varval;
char *rvarname;
varval = NULL;
if ((varval = get_special_var(varname, msh)) != NULL)
{
return (varval);
}
else if ((varval = get_cstm_vr(varname, msh)) != NULL)
{
return (varval);
}
else
{
rvarname = set_rva(varname, msh);
varval = get_frm_env(rvarname, msh);
return (varval);
}
return (NULL);
}
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