108 lines
3.0 KiB
C
108 lines
3.0 KiB
C
/* ************************************************************************** */
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/* */
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/* ::: :::::::: */
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/* expand_token.c :+: :+: :+: */
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/* +:+ +:+ +:+ */
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/* By: lperrey <lperrey@student.42.fr> +#+ +:+ +#+ */
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/* +#+#+#+#+#+ +#+ */
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/* Created: 2021/11/07 02:01:33 by lperrey #+# #+# */
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/* Updated: 2021/11/30 18:35:44 by lperrey ### ########.fr */
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/* */
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/* ************************************************************************** */
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#include "minishell.h"
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static t_list *ret_parameter_expansion(char *content, int *i);
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t_list *expand_token(char *content)
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{
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int in_quotes;
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int i;
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int i_exp;
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t_list head;
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t_list *expand;
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in_quotes = 0;
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i = 0;
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head.next = NULL;
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expand = &head;
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while (content[i])
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{
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if (content[i] == '$')
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{
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expand->next = ret_parameter_expansion(content, &i);
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expand = expand->next;
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if (!expand)
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{//todo wrap
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perror("expand_token() error");
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return (ft_lstclear(&head.next, free));
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}
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}
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else
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{
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expand->next = ft_lstnew_generic(sizeof(t_list), ft_strlen(&content[i]) + 1);
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expand = expand->next;
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i_exp = 0;
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if (!expand)
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{//todo wrap
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perror("expand_token() error");
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return (ft_lstclear(&head.next, free));
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}
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while (content[i] && (content[i] != '$' || in_quotes == IN_QUOTES))
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{
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// quoting
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if (content[i] == '\'' && in_quotes != IN_DQUOTES)
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{
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if (in_quotes == IN_QUOTES)
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in_quotes = 0;
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else
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in_quotes = IN_QUOTES;
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}
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((char *)expand->content)[i_exp++] = content[i++];
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}
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}
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}
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return (head.next);
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}
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// a voir si je retourne pas plutot un "char *".
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// Malloc la lst dans la fonction est peut-être un peu superflu et pas super clair.
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static t_list *ret_parameter_expansion(char *content, int *i)
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{
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t_list *expand;
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char *tmp;
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int i_tmp;
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tmp = ft_calloc(ft_strlen(&content[*i]) + 1, 1);
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if (!tmp)
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return (NULL);
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expand = ft_lstnew(NULL);
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if (!expand)
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return (ft_retp_free(NULL, tmp, free));
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(*i)++; // skip '$'
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if (content[*i] == '?')
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{
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(*i)++;
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expand->content = ft_itoa(get_last_exit_status());
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return (ft_retp_free(expand, tmp, free));
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}
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else if (content[*i] != '_' && !ft_isalpha(content[*i]))
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{
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tmp[0] = '$';
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expand->content = tmp;
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return (expand);
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}
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i_tmp = 0;
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while (content[*i] == '_' || ft_isalnum(content[*i]))
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tmp[i_tmp++] = content[(*i)++];
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expand->content = getenv(tmp);
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free(tmp);
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if (expand->content)
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expand->content = ft_strdup(expand->content);
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else
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expand->content = ft_calloc(1, 1);
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if (!expand->content)
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return (ft_retp_free(NULL, expand, free));
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return (expand);
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}
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