1 files changed, 115 insertions, 4 deletions
diff --git a/src/b_unset.c b/src/b_unset.c
index 92db749..598db92 100644
--- a/src/b_unset.c
+++ b/src/b_unset.c
@@ -10,16 +10,127 @@
 /*                                                                            */
 /* ************************************************************************** */
 
+#include <libft.h>
 #include <stdint.h>
+#include <stdlib.h>
 
+#include "f_fail.h"
+#include "s_lvars.h"
 #include "s_struct.h"
 
+static t_bool
+	check_valid_identifier(const char arg[])
+{
+	char	*ptr;
+	t_bool	r;
+
+	ptr = (char*)arg;
+	r = TRUE;
+	if (ft_isalpha(ptr[0]) == 0)
+	{
+		r = FALSE;
+	}
+	if (ptr[0] == '_')
+	{
+		r = TRUE;
+	}
+	while (*ptr != '\0')
+	{
+		if (*ptr == '=')
+		{
+			r = FALSE;
+		}
+		ptr++;
+	}
+	return (r);
+}
+
+static void
+	b_realloc_env(size_t skip,
+				t_msh *msh)
+{
+	char	**nenvp;
+	int8_t	skipped;
+	size_t	i;
+
+	i = 0;
+	while (msh->envp[i] != NULL)
+		i++;
+	if (!(nenvp = (char**)malloc(i * sizeof(char*))))
+		f_fail_alloc_and_destroy(msh);
+	i = 0;
+	skipped = 0;
+	while (msh->envp[i] != NULL)
+	{
+		if (i == skip)
+		{
+			i += 1;
+			skipped = 1;
+		}
+		if (!(nenvp[i - skipped] = ft_strdup(msh->envp[i])))
+			f_fail_alloc_and_destroy(msh);
+		i++;
+	}
+	nenvp[i - 1] = 0;
+	ft_delwords(msh->envp);
+	msh->envp = nenvp;
+}
+
+static t_bool
+	b_removed_from_env(const char arg[],
+					t_msh *msh)
+{
+	size_t	i;
+
+	i = 0;
+	while (msh->envp[i] != NULL)
+	{
+		if (ft_strncmp(arg, msh->envp[i], ft_strlen(arg)) == 0)
+		{
+			b_realloc_env(i, msh);
+			return (TRUE);
+		}
+		i++;
+	}
+	return (FALSE);
+}
+
+static void
+	b_remove_it(const char arg[],
+				t_msh *msh)
+{
+	if (b_removed_from_env(arg, msh) == FALSE)
+	{
+		lvars_delone(&msh->vars, arg);
+	}
+}
+
 uint8_t
 	b_unset(char *args[],
 			t_msh *msh)
 {
-	(void)args;
-	(void)msh;
-	/* TODO: do unset */
-	return (0);
+	char	**ptr;
+	t_bool	next;
+	int8_t	r;
+
+	if (args[0] == NULL)
+		return (0);
+	r = 0;
+	ptr = args;
+	while (*ptr != NULL)
+	{
+		next = FALSE;
+		if (check_valid_identifier(*ptr) == FALSE)
+		{
+			f_fail_identifier("unset", *ptr);
+			next = TRUE;
+			r = 1;
+		}
+		if (next == FALSE)
+		{
+			b_remove_it(*ptr, msh);
+		}
+		ptr++;
+	}
+	return (r);
 }