From e8b9703043c49e49edd4d705b7ce198e92f0b79e Mon Sep 17 00:00:00 2001
From: Patrick McDermott <patrick.mcdermott@libiquity.com>
Date: Fri, 28 Apr 2023 21:38:39 -0400
Subject: opk: Remove found members from list

---
(limited to 'src/opk.c')

diff --git a/src/opk.c b/src/opk.c
index 3090add..8045b55 100644
--- a/src/opk.c
+++ b/src/opk.c
@@ -30,12 +30,13 @@
 
 struct _opkg_opk_opk_seek_name {
 	const char                     *name;
-	int                             found;
+	struct _opkg_opk_opk_seek_name *prev;
 	struct _opkg_opk_opk_seek_name *next;
 };
 
 struct opkg_opk_opk {
-	struct _opkg_opk_opk_seek_name *print_control;
+	struct _opkg_opk_opk_seek_name *print_control_head;
+	struct _opkg_opk_opk_seek_name *print_control_tail;
 	int                             list_data;
 	FILE                           *file;
 	char                            file_buffer[8192];
@@ -56,7 +57,8 @@ opkg_opk_opk_init(void)
 		return NULL;
 	}
 
-	opk->print_control      = NULL;
+	opk->print_control_head = NULL;
+	opk->print_control_tail = NULL;
 	opk->list_data          = 0;
 	opk->previously_printed = 0;
 
@@ -64,31 +66,39 @@ opkg_opk_opk_init(void)
 }
 
 static int
-_opkg_opk_opk_add_seek_name(struct _opkg_opk_opk_seek_name **names,
-		const char *name)
+_opkg_opk_opk_add_seek_name(struct _opkg_opk_opk_seek_name **head,
+		struct _opkg_opk_opk_seek_name **tail, const char *name)
 {
-	struct _opkg_opk_opk_seek_name *seek_name;
+	struct _opkg_opk_opk_seek_name *new;
 
-	seek_name = malloc(sizeof(*seek_name));
-	if (seek_name == NULL) {
+	new = malloc(sizeof(*new));
+	if (new == NULL) {
 		return OPKG_OPK_ERROR;
 	}
 	if (name[0] == '.' && name[1] == '/') {
-		seek_name->name = name + 2;
+		new->name = name + 2;
 	} else {
-		seek_name->name = name;
+		new->name = name;
 	}
-	seek_name->found = 0;
-	seek_name->next  = *names;
 
-	*names = seek_name;
+	new->prev = *tail;
+	new->next = NULL;
+
+	if (*head == NULL) {
+		*head = new;
+	} else {
+		(*tail)->next = new;
+	}
+	*tail = new;
+
 	return OPKG_OPK_OK;
 }
 
 int
 opkg_opk_opk_print_control(struct opkg_opk_opk *opk, const char *name)
 {
-	return _opkg_opk_opk_add_seek_name(&opk->print_control, name);
+	return _opkg_opk_opk_add_seek_name(&opk->print_control_head,
+			&opk->print_control_tail, name);
 }
 
 int
@@ -147,11 +157,11 @@ _opkg_opk_opk_free_inner(struct opkg_opk_opk *opk)
 
 static int
 _opkg_opk_opk_seek(struct opkg_opk_ustar *ustar,
-		struct _opkg_opk_opk_seek_name *names)
+		struct _opkg_opk_opk_seek_name **head,
+		struct _opkg_opk_opk_seek_name **tail)
 {
 	struct opkg_opk_ustar_member   *member;
 	int                             found;
-	int                             found_all;
 	struct _opkg_opk_opk_seek_name *seek_name;
 
 	for (;;) {
@@ -161,15 +171,23 @@ _opkg_opk_opk_seek(struct opkg_opk_ustar *ustar,
 		}
 
 		/* Check each requested name. */
-		found     = 0;
-		found_all = 1;
-		for (seek_name = names; seek_name != NULL;
+		found = 0;
+		for (seek_name = *head; seek_name != NULL;
 				seek_name = seek_name->next) {
-			if (seek_name->found == 1) {
-				continue;  /* Previously found this member */
-			}
 			if (strcmp(member->name, seek_name->name) == 0) {
-				seek_name->found = 1;
+				if (seek_name->prev != NULL) {
+					seek_name->prev->next = seek_name->next;
+				} else {
+					/* This was the head.  Update. */
+					*head = seek_name->next;
+				}
+				if (seek_name->next != NULL) {
+					seek_name->next->prev = seek_name->prev;
+				} else {
+					/* This was the tail.  Update. */
+					*tail = seek_name->prev;
+				}
+				free(seek_name);
 				found = 1;
 				break;
 			}
@@ -177,15 +195,26 @@ _opkg_opk_opk_seek(struct opkg_opk_ustar *ustar,
 					strcmp(member->name + 2,
 						seek_name->name) == 0)
 			{
-				seek_name->found = 1;
+				if (seek_name->prev != NULL) {
+					seek_name->prev->next = seek_name->next;
+				} else {
+					/* This was the head.  Update. */
+					*head = seek_name->next;
+				}
+				if (seek_name->next != NULL) {
+					seek_name->next->prev = seek_name->prev;
+				} else {
+					/* This was the tail.  Update. */
+					*tail = seek_name->prev;
+				}
+				free(seek_name);
 				found = 1;
 				break;
 			}
-			found_all = 0;
 		}
 		free(member);
 		if (found == 1) {
-			if (found_all == 1) {
+			if (*head == NULL) {
 				/* All requested members found */
 				return OPKG_OPK_END;
 			}
@@ -204,7 +233,7 @@ _opkg_opk_opk_read_control(struct opkg_opk_opk *opk)
 	int     ret_seek;
 	int     ret_read;
 
-	if (opk->print_control == NULL) {
+	if (opk->print_control_head == NULL) {
 		/* No control files requested. */
 		return OPKG_OPK_OK;
 	}
@@ -214,7 +243,9 @@ _opkg_opk_opk_read_control(struct opkg_opk_opk *opk)
 	}
 
 	while ((ret_seek = _opkg_opk_opk_seek(opk->inner_ustar,
-					opk->print_control)) != OPKG_OPK_ERROR)
+					&opk->print_control_head,
+					&opk->print_control_tail)) !=
+			OPKG_OPK_ERROR)
 	{
 		if (opk->previously_printed == 1) {
 			puts("");
@@ -472,9 +503,9 @@ opkg_opk_opk_free(struct opkg_opk_opk *opk)
 {
 	struct _opkg_opk_opk_seek_name *name;
 
-	while (opk->print_control != NULL) {
-		name               = opk->print_control;
-		opk->print_control = opk->print_control->next;
+	while (opk->print_control_head != NULL) {
+		name                    = opk->print_control_head;
+		opk->print_control_head = opk->print_control_head->next;
 		free(name);
 	}
 	free(opk);
--
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