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https://codeberg.org/la-chouette/minishell.git
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fa383c4f17
Norm has been checked, test are not up to date. Wildcard management and filename expansions still to be done.
132 lines
4 KiB
C
132 lines
4 KiB
C
/* ************************************************************************** */
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/* */
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/* ::: :::::::: */
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/* variable_subst.c :+: :+: :+: */
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/* +:+ +:+ +:+ */
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/* By: jguelen <jguelen@student.42.fr> +#+ +:+ +#+ */
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/* +#+#+#+#+#+ +#+ */
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/* Created: 2025/02/23 15:02:37 by jguelen #+# #+# */
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/* Updated: 2025/03/01 17:01:47 by jguelen ### ########.fr */
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/* */
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/* ************************************************************************** */
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#include "subst.h"
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#include "../minishell.h"
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#include "replace_substr.h"
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#include "../env/env.h"
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#include "../env/env_manip.h"
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static char *word_update(t_worddesc *word, size_t i, size_t id_len, char *rep)
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{
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char *new_word;
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size_t rep_len;
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size_t digit;
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digit = ft_isdigit(word->word[i + 1]);
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rep_len = ft_strlen(rep);
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new_word = replace_in_str(word->word, i, i + id_len + digit, rep);
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free(rep);
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free(word->word);
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word->word = new_word;
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rep = construct_repeting_char_string('$', rep_len);
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if (!rep)
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return (NULL);
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new_word = replace_in_str(word->mark_string, i, i + id_len + digit, rep);
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free(rep);
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if (!new_word)
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return (NULL);
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free(word->mark_string);
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word->mark_string = new_word;
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return (new_word);
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}
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static char *calculate_replacement(t_worddesc *word, t_minishell *app, size_t i,
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size_t *id_len)
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{
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char *rep;
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char *id;
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id = ft_get_longest_identifier(word->word + i + 1);
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if (!id)
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return (NULL);
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*id_len = ft_strlen(id);
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if (*id_len == 0 && word->word[i + 1] == '?')
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{
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rep = expand_question_mark(app);
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if (!rep)
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return (NULL);
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}
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else
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{
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rep = env_get_val(app->env, id);
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if (!rep)
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rep = strdup("");
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else
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rep = strdup(rep);
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if (!rep)
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return (NULL);
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}
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free(id);
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return (rep);
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}
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/*
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** @Param word should NOT be NULL.
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** Replace the word field of the t_worddesc pointer word with a new string
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** corresponding to the replacement of the '$' followed by a valid bash
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** identifier with the corresponding value if present in env or nothing if
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** the corresponding identifier does not have an entry in env.
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** Additionnally if the first character following is a digit both the '$'
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** and digit are removed even though we do not deal with those type of bash
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** parameters (we consider them to never hold a value).
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** Similarly if the character following the '$' is neither '_' or
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** alphanumerical the dollar is removed except for the appearance of a '\0'
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** signaling the end of the word.
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** Returns NULL in case of error, or the worddesc pointer word itself if
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** everything went normally.
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*/
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t_worddesc *word_var_expansion(t_worddesc *word, t_minishell *app)
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{
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size_t i;
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size_t id_len;
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size_t rep_len;
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char *rep;
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i = 0;
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while (word->word[i] && word->word[i + 1])
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{
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if (word->mark_string[i] != '\'' && word->word[i] == '$')
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{
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rep = calculate_replacement(word, app, i, &id_len);
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if (!rep)
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return (NULL);
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rep_len = ft_strlen(rep);
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if (word_update(word, i, id_len, rep) == NULL)
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return (NULL);
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}
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i += rep_len;
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}
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return (word);
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}
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/*
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** Returns the t_wordlist passed as a parameter where the words have been
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** modified to contain string that represent the result of parameter expansion
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** where the introductory '$' character was not single quoted.
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** We do NOT take the '\' character into account as an escape character here
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** under any circumstance per subject requirement.
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*/
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t_wordlist *wordlist_var_expansion(t_wordlist *list, t_minishell *app)
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{
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t_wordlist *tmp_list;
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tmp_list = list;
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while (tmp_list)
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{
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if ((tmp_list->word->flags & W_HASDOLLAR)
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&& word_var_expansion(tmp_list->word, app) == NULL)
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return (NULL);
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tmp_list = tmp_list->next;
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}
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return (list);
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}
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