X-Git-Url: http://git.archive.openwrt.org/?p=project%2Fuci.git;a=blobdiff_plain;f=list.c;h=ab40bdae11663461994b64f9fe5f8de64657dc94;hp=5561778b1c47b22c4ce297cc1048b34c625d8ce2;hb=3bff697cca125a6a4147e3bd1c469b36504e8237;hpb=f0be94e4d8d2a0c8ab35b932e88170cc37cca4af

diff --git a/list.c b/list.c
index 5561778..ab40bda 100644
--- a/list.c
+++ b/list.c
@@ -2,9 +2,9 @@
  * libuci - Library for the Unified Configuration Interface
  * Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
  *
- * this program is free software; you can redistribute it and/or modify
- * it under the terms of the gnu lesser general public license version 2.1
- * as published by the free software foundation
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1
+ * as published by the Free Software Foundation
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -12,8 +12,6 @@
  * GNU General Public License for more details.
  */
 
-#include <glob.h>
-
 /* initialize a list head/item */
 static inline void uci_list_init(struct uci_list *ptr)
 {
@@ -58,21 +56,33 @@ static struct uci_element *
 uci_alloc_generic(struct uci_context *ctx, int type, const char *name, int size)
 {
 	struct uci_element *e;
+	int datalen = size;
 	void *ptr;
 
-	ptr = uci_malloc(ctx, size + strlen(name) + 1);
+	ptr = uci_malloc(ctx, datalen);
 	e = (struct uci_element *) ptr;
 	e->type = type;
-	e->name = (char *) ptr + size;
-	strcpy(e->name, name);
+	if (name) {
+		UCI_TRAP_SAVE(ctx, error);
+		e->name = uci_strdup(ctx, name);
+		UCI_TRAP_RESTORE(ctx);
+	}
 	uci_list_init(&e->list);
+	goto done;
 
+error:
+	free(ptr);
+	UCI_THROW(ctx, ctx->err);
+
+done:
 	return e;
 }
 
 static void
 uci_free_element(struct uci_element *e)
 {
+	if (e->name)
+		free(e->name);
 	if (!uci_list_empty(&e->list))
 		uci_list_del(&e->list);
 	free(e);
@@ -86,9 +96,10 @@ uci_alloc_option(struct uci_section *s, const char *name, const char *value)
 	struct uci_option *o;
 
 	o = uci_alloc_element(ctx, option, name, strlen(value) + 1);
-	o->value = uci_dataptr(o);
+	o->type = UCI_TYPE_STRING;
+	o->v.string = uci_dataptr(o);
 	o->section = s;
-	strcpy(o->value, value);
+	strcpy(o->v.string, value);
 	uci_list_add(&s->options, &o->e.list);
 
 	return o;
@@ -97,26 +108,95 @@ uci_alloc_option(struct uci_section *s, const char *name, const char *value)
 static inline void
 uci_free_option(struct uci_option *o)
 {
+	struct uci_element *e, *tmp;
+
+	switch(o->type) {
+	case UCI_TYPE_STRING:
+		if ((o->v.string != uci_dataptr(o)) &&
+			(o->v.string != NULL))
+			free(o->v.string);
+		break;
+	case UCI_TYPE_LIST:
+		uci_foreach_element_safe(&o->v.list, tmp, e) {
+			uci_free_element(e);
+		}
+		break;
+	default:
+		break;
+	}
 	uci_free_element(&o->e);
 }
 
+static struct uci_option *
+uci_alloc_list(struct uci_section *s, const char *name)
+{
+	struct uci_package *p = s->package;
+	struct uci_context *ctx = p->ctx;
+	struct uci_option *o;
+
+	o = uci_alloc_element(ctx, option, name, 0);
+	o->type = UCI_TYPE_LIST;
+	o->section = s;
+	uci_list_init(&o->v.list);
+	uci_list_add(&s->options, &o->e.list);
+
+	return o;
+}
+
+/* fix up an unnamed section, e.g. after adding options to it */
+static void uci_fixup_section(struct uci_context *ctx, struct uci_section *s)
+{
+	unsigned int hash = ~0;
+	struct uci_element *e;
+	char buf[16];
+
+	if (!s || s->e.name)
+		return;
+
+	/*
+	 * Generate a name for unnamed sections. This is used as reference
+	 * when locating or updating the section from apps/scripts.
+	 * To make multiple concurrent versions somewhat safe for updating,
+	 * the name is generated from a hash of its type and name/value
+	 * pairs of its option, and it is prefixed by a counter value.
+	 * If the order of the unnamed sections changes for some reason,
+	 * updates to them will be rejected.
+	 */
+	hash = djbhash(hash, s->type);
+	uci_foreach_element(&s->options, e) {
+		struct uci_option *o;
+		hash = djbhash(hash, e->name);
+		o = uci_to_option(e);
+		switch(o->type) {
+		case UCI_TYPE_STRING:
+			hash = djbhash(hash, o->v.string);
+			break;
+		default:
+			break;
+		}
+	}
+	sprintf(buf, "cfg%02x%04x", ++s->package->n_section, hash % (1 << 16));
+	s->e.name = uci_strdup(ctx, buf);
+}
+
 static struct uci_section *
 uci_alloc_section(struct uci_package *p, const char *type, const char *name)
 {
 	struct uci_context *ctx = p->ctx;
 	struct uci_section *s;
-	char buf[16];
 
-	if (!name || !name[0]) {
-		snprintf(buf, 16, "cfg%d", p->n_section);
-		name = buf;
-	}
+	if (name && !name[0])
+		name = NULL;
 
 	s = uci_alloc_element(ctx, section, name, strlen(type) + 1);
+	uci_list_init(&s->options);
 	s->type = uci_dataptr(s);
 	s->package = p;
 	strcpy(s->type, type);
-	uci_list_init(&s->options);
+	if (name == NULL)
+		s->anonymous = true;
+	p->n_section++;
+
 	uci_list_add(&p->sections, &s->e.list);
 
 	return s;
@@ -130,10 +210,13 @@ uci_free_section(struct uci_section *s)
 	uci_foreach_element_safe(&s->options, tmp, o) {
 		uci_free_option(uci_to_option(o));
 	}
+	if ((s->type != uci_dataptr(s)) &&
+		(s->type != NULL))
+		free(s->type);
 	uci_free_element(&s->e);
 }
 
-static struct uci_package *
+__plugin struct uci_package *
 uci_alloc_package(struct uci_context *ctx, const char *name)
 {
 	struct uci_package *p;
@@ -142,39 +225,35 @@ uci_alloc_package(struct uci_context *ctx, const char *name)
 	p->ctx = ctx;
 	uci_list_init(&p->sections);
 	uci_list_init(&p->history);
+	uci_list_init(&p->saved_history);
 	return p;
 }
 
 static void
-uci_free_package(struct uci_package *p)
+uci_free_package(struct uci_package **package)
 {
 	struct uci_element *e, *tmp;
+	struct uci_package *p = *package;
 
 	if(!p)
 		return;
 
+	if (p->path)
+		free(p->path);
 	uci_foreach_element_safe(&p->sections, tmp, e) {
 		uci_free_section(uci_to_section(e));
 	}
+	uci_foreach_element_safe(&p->history, tmp, e) {
+		uci_free_history(uci_to_history(e));
+	}
+	uci_foreach_element_safe(&p->saved_history, tmp, e) {
+		uci_free_history(uci_to_history(e));
+	}
 	uci_free_element(&p->e);
+	*package = NULL;
 }
 
-/* record a change that was done to a package */
-static inline void
-uci_add_history(struct uci_context *ctx, struct uci_package *p, int cmd, char *section, char *option, char *value)
-{
-	struct uci_history *h = (struct uci_history *) uci_malloc(ctx, sizeof(struct uci_history));
-
-	uci_list_init(&h->list);
-	h->cmd = cmd;
-	h->section = section;
-	h->option = option;
-	h->value = value;
-	uci_list_add(&p->history, &h->list);
-}
-
-
-static struct uci_element *uci_lookup_list(struct uci_context *ctx, struct uci_list *list, char *name)
+static struct uci_element *uci_lookup_list(struct uci_list *list, const char *name)
 {
 	struct uci_element *e;
 
@@ -182,48 +261,236 @@ static struct uci_element *uci_lookup_list(struct uci_context *ctx, struct uci_l
 		if (!strcmp(e->name, name))
 			return e;
 	}
-	UCI_THROW(ctx, UCI_ERR_NOTFOUND);
+	return NULL;
 }
 
-int uci_lookup(struct uci_context *ctx, struct uci_element **res, char *package, char *section, char *option)
+int uci_lookup_ext(struct uci_context *ctx, struct uci_element **res, char *ptr)
 {
+	struct uci_package *p = NULL;
 	struct uci_element *e;
-	struct uci_package *p;
 	struct uci_section *s;
-	struct uci_option *o;
+	char *package = NULL;
+	char *section = NULL;
+	char *option = NULL;
+	char *idxstr, *t;
+	int idx, c;
 
 	UCI_HANDLE_ERR(ctx);
 	UCI_ASSERT(ctx, res != NULL);
-	UCI_ASSERT(ctx, package != NULL);
+	UCI_ASSERT(ctx, ptr != NULL);
+
+	UCI_INTERNAL(uci_parse_tuple, ctx, ptr, &package, &section, &option, NULL);
+
+	/* look up the package first */
+	e = uci_lookup_list(&ctx->root, package);
+	if (!e) {
+		UCI_INTERNAL(uci_load, ctx, package, &p);
+		if (!p)
+			goto notfound;
+		e = &p->e;
+	} else {
+		p = uci_to_package(e);
+	}
 
-	e = uci_lookup_list(ctx, &ctx->root, package);
 	if (!section)
-		goto found;
+		goto done;
 
-	p = uci_to_package(e);
-	e = uci_lookup_list(ctx, &p->sections, section);
-	if (!option)
-		goto found;
+	/* if the section name validates as a regular name, pass through
+	 * to the regular uci_lookup function call */
+	if (!*section || uci_validate_name(section)) {
+		UCI_INTERNAL(uci_lookup, ctx, &e, p, section, option);
+		goto done;
+	}
 
-	s = uci_to_section(e);
-	e = uci_lookup_list(ctx, &s->options, option);
+	/* name did not validate, that means we have an extended lookup call
+	 * parse it here. for now only the section index syntax is supported */
+	if (section[0] != '@')
+		goto error;
+
+	section++;
+
+	/* parse the section index part */
+	idxstr = strchr(section, '[');
+	if (!idxstr)
+		goto error;
+	*idxstr = 0;
+	idxstr++;
+
+	t = strchr(idxstr, ']');
+	if (!t)
+		goto error;
+	if (t[1] != 0)
+		goto error;
+	*t = 0;
+
+	t = NULL;
+	idx = strtol(idxstr, &t, 10);
+	if (t && *t)
+		goto error;
+
+	if (!*section)
+		section = NULL;
+	if (section && !uci_validate_str(section, false))
+		goto error;
+
+	/* if the given index is negative, it specifies the section number from 
+	 * the end of the list */
+	if (idx < 0) {
+		c = 0;
+		uci_foreach_element(&p->sections, e) {
+			s = uci_to_section(e);
+			if (section && (strcmp(s->type, section) != 0))
+				continue;
+
+			c++;
+		}
+		idx += c;
+	}
+
+	c = 0;
+	uci_foreach_element(&p->sections, e) {
+		s = uci_to_section(e);
+		if (section && (strcmp(s->type, section) != 0))
+			continue;
+
+		if (idx == c)
+			goto found;
+		c++;
+	}
+	goto notfound;
 
 found:
+	if (option)
+		e = uci_lookup_list(&s->options, option);
+done:
 	*res = e;
 	return 0;
+
+notfound:
+	UCI_THROW(ctx, UCI_ERR_NOTFOUND);
+error:
+	UCI_THROW(ctx, UCI_ERR_INVAL);
+	return 0;
 }
 
-int uci_set_element_value(struct uci_context *ctx, struct uci_element **element, char *value)
+int uci_lookup(struct uci_context *ctx, struct uci_element **res, struct uci_package *p, const char *section, const char *option)
 {
-	int size;
-	char *str;
+	struct uci_element *e;
+	struct uci_section *s;
+
+	UCI_HANDLE_ERR(ctx);
+	UCI_ASSERT(ctx, res != NULL);
+	UCI_ASSERT(ctx, p != NULL);
+	UCI_ASSERT(ctx, section && uci_validate_name(section));
+	if (option)
+		UCI_ASSERT(ctx, uci_validate_name(option));
+
+	e = uci_lookup_list(&p->sections, section);
+	if (!e)
+		goto notfound;
+
+	if (option) {
+		s = uci_to_section(e);
+		e = uci_lookup_list(&s->options, option);
+		if (!e)
+			goto notfound;
+	}
+
+	*res = e;
+	return 0;
+
+notfound:
+	UCI_THROW(ctx, UCI_ERR_NOTFOUND);
+	return 0;
+}
+
+int uci_del_element(struct uci_context *ctx, struct uci_element *e)
+{
+	/* NB: UCI_INTERNAL use means without history tracking */
+	bool internal = ctx->internal;
+	struct uci_package *p = NULL;
+	struct uci_section *s = NULL;
+	struct uci_option *o = NULL;
+	struct uci_element *i, *tmp;
+	char *option = NULL;
+
+	UCI_HANDLE_ERR(ctx);
+	UCI_ASSERT(ctx, e != NULL);
+
+	switch(e->type) {
+	case UCI_TYPE_SECTION:
+		s = uci_to_section(e);
+		uci_foreach_element_safe(&s->options, tmp, i) {
+			uci_del_element(ctx, i);
+		}
+		break;
+	case UCI_TYPE_OPTION:
+		o = uci_to_option(e);
+		s = o->section;
+		p = s->package;
+		option = e->name;
+		break;
+	default:
+		UCI_THROW(ctx, UCI_ERR_INVAL);
+		break;
+	}
+
+	p = s->package;
+	if (!internal && p->has_history)
+		uci_add_history(ctx, &p->history, UCI_CMD_REMOVE, s->e.name, option, NULL);
+
+	switch(e->type) {
+	case UCI_TYPE_SECTION:
+		uci_free_section(s);
+		break;
+	case UCI_TYPE_OPTION:
+		uci_free_option(o);
+		break;
+	default:
+		break;
+	}
+
+	return 0;
+}
+
+int uci_add_element_list(struct uci_context *ctx, struct uci_option *o, const char *value)
+{
+	struct uci_element *e;
+	struct uci_package *p;
+	struct uci_section *s;
+	bool internal = ctx->internal;
+
+	UCI_HANDLE_ERR(ctx);
+	UCI_ASSERT(ctx, (o != NULL) && (o->type == UCI_TYPE_LIST) && uci_validate_text(value));
+
+	s = o->section;
+	p = s->package;
+
+	if (!internal && p->has_history)
+		uci_add_history(ctx, &p->history, UCI_CMD_LIST_ADD, s->e.name, o->e.name, value);
+
+	e = uci_alloc_generic(ctx, UCI_TYPE_ITEM, value, 0);
+	uci_list_add(&o->v.list, &e->list);
+
+	return 0;
+}
+
+int uci_set_element_value(struct uci_context *ctx, struct uci_element **element, const char *value)
+{
+	/* NB: UCI_INTERNAL use means without history tracking */
+	bool internal = ctx->internal;
 	struct uci_list *list;
 	struct uci_element *e;
+	struct uci_package *p;
+	struct uci_section *s;
+	struct uci_option *o;
+	char *section;
+	char *option;
+	char *str;
+	int size = 0;
 
 	UCI_HANDLE_ERR(ctx);
-	UCI_ASSERT(ctx, value != NULL);
-	UCI_ASSERT(ctx, element != NULL);
-	UCI_ASSERT(ctx, *element != NULL);
+	UCI_ASSERT(ctx, (element != NULL) && (*element != NULL));
 
 	/* what the 'value' of an element means depends on the type
 	 * for a section, the 'value' means its type
@@ -236,16 +503,52 @@ int uci_set_element_value(struct uci_context *ctx, struct uci_element **element,
 	 */
 	e = *element;
 	list = e->list.prev;
+
 	switch(e->type) {
 	case UCI_TYPE_SECTION:
+		UCI_ASSERT(ctx, uci_validate_str(value, false));
 		size = sizeof(struct uci_section);
+		s = uci_to_section(e);
+		section = e->name;
+		option = NULL;
+		/* matches the currently set value */
+		if (!strcmp(value, s->type))
+			return 0;
 		break;
+
 	case UCI_TYPE_OPTION:
-		size = sizeof(struct uci_option);
+		UCI_ASSERT(ctx, value != NULL);
+		o = uci_to_option(e);
+		s = o->section;
+		section = s->e.name;
+		option = o->e.name;
+		switch(o->type) {
+		case UCI_TYPE_STRING:
+			size = sizeof(struct uci_option);
+			/* matches the currently set value */
+			if (!strcmp(value, o->v.string))
+				return 0;
+			break;
+		default:
+			/* default action for non-string datatypes is to delete
+			 * the existing entry, then re-create it as a string */
+			break;
+		}
 		break;
+
 	default:
 		UCI_THROW(ctx, UCI_ERR_INVAL);
-		break;
+		return 0;
+	}
+	p = s->package;
+	if (!internal && p->has_history)
+		uci_add_history(ctx, &p->history, UCI_CMD_CHANGE, section, option, value);
+
+	if ((e->type == UCI_TYPE_OPTION) && (size == 0)) {
+		o = uci_alloc_option(s, option, value);
+		UCI_INTERNAL(uci_del_element, ctx, e);
+		*element = &o->e;
+		goto done;
 	}
 
 	uci_list_del(&e->list);
@@ -256,55 +559,161 @@ int uci_set_element_value(struct uci_context *ctx, struct uci_element **element,
 
 	switch(e->type) {
 	case UCI_TYPE_SECTION:
-		uci_to_section(e)->type = value;
+		uci_to_section(e)->type = str;
 		break;
 	case UCI_TYPE_OPTION:
-		uci_to_option(e)->value = value;
+		uci_to_option(e)->v.string = str;
 		break;
 	default:
 		break;
 	}
 
+done:
 	return 0;
 }
 
-int uci_set(struct uci_context *ctx, char *package, char *section, char *option, char *value)
+int uci_rename(struct uci_context *ctx, struct uci_package *p, char *section, char *option, char *name)
 {
+	/* NB: UCI_INTERNAL use means without history tracking */
+	bool internal = ctx->internal;
 	struct uci_element *e;
-	struct uci_package *p = NULL;
+
+	UCI_HANDLE_ERR(ctx);
+
+	/* NB: p, section, option validated by uci_lookup */
+	UCI_INTERNAL(uci_lookup, ctx, &e, p, section, option);
+
+	if (!internal && p->has_history)
+		uci_add_history(ctx, &p->history, UCI_CMD_RENAME, section, option, name);
+
+	name = uci_strdup(ctx, name);
+	if (e->name)
+		free(e->name);
+	e->name = name;
+
+	return 0;
+}
+
+int uci_add_section(struct uci_context *ctx, struct uci_package *p, const char *type, struct uci_section **res)
+{
+	bool internal = ctx->internal;
+	struct uci_section *s;
+
+	UCI_HANDLE_ERR(ctx);
+	UCI_ASSERT(ctx, p != NULL);
+	s = uci_alloc_section(p, type, NULL);
+	uci_fixup_section(ctx, s);
+	*res = s;
+	if (!internal && p->has_history)
+		uci_add_history(ctx, &p->history, UCI_CMD_ADD, s->e.name, NULL, type);
+
+	return 0;
+}
+
+int uci_delete(struct uci_context *ctx, struct uci_package *p, const char *section, const char *option)
+{
+	/* NB: pass on internal flag to uci_del_element */
+	bool internal = ctx->internal;
+	struct uci_element *e;
+
+	UCI_HANDLE_ERR(ctx);
+
+	/* NB: p, section, option validated by uci_lookup */
+	UCI_INTERNAL(uci_lookup, ctx, &e, p, section, option);
+
+	ctx->internal = internal;
+	return uci_del_element(ctx, e);
+}
+
+int uci_add_list(struct uci_context *ctx, struct uci_package *p, const char *section, const char *option, const char *value, struct uci_option **result)
+{
+	/* NB: UCI_INTERNAL use means without history tracking */
+	bool internal = ctx->internal;
+	struct uci_element *e;
+	struct uci_section *s;
+	struct uci_option *o;
+	struct uci_option *prev = NULL;
+	const char *value2 = NULL;
+
+	UCI_HANDLE_ERR(ctx);
+	UCI_ASSERT(ctx, p && section && option && value && uci_validate_text(value));
+
+	/* look up the section first */
+	UCI_INTERNAL(uci_lookup, ctx, &e, p, section, NULL);
+	s = uci_to_section(e);
+
+	e = uci_lookup_list(&s->options, option);
+	if (e) {
+		o = uci_to_option(e);
+		switch (o->type) {
+		case UCI_TYPE_STRING:
+			/* we already have a string value, let's convert that to a list */
+			prev = o;
+			value2 = value;
+			value = o->v.string;
+			break;
+		case UCI_TYPE_LIST:
+			if (result)
+				*result = o;
+
+			ctx->internal = internal;
+			return uci_add_element_list(ctx, o, value);
+		default:
+			UCI_THROW(ctx, UCI_ERR_INVAL);
+			break;
+		}
+	}
+
+	o = uci_alloc_list(s, option);
+	if (result)
+		*result = o;
+	if (prev) {
+		UCI_INTERNAL(uci_add_element_list, ctx, o, value);
+		uci_free_option(prev);
+		value = value2;
+	}
+
+	ctx->internal = internal;
+	return uci_add_element_list(ctx, o, value);
+}
+
+int uci_set(struct uci_context *ctx, struct uci_package *p, const char *section, const char *option, const char *value, struct uci_element **result)
+{
+	/* NB: UCI_INTERNAL use means without history tracking */
+	bool internal = ctx->internal;
+	struct uci_element *e = NULL;
 	struct uci_section *s = NULL;
 	struct uci_option *o = NULL;
-	struct uci_history *h;
 
 	UCI_HANDLE_ERR(ctx);
-	UCI_ASSERT(ctx, package != NULL);
-	UCI_ASSERT(ctx, section != NULL);
-
-	fprintf(stderr, "uci_set: '%s' '%s' '%s' = '%s'\n", package, section, option, value);
+	UCI_ASSERT(ctx, p != NULL);
+	UCI_ASSERT(ctx, uci_validate_name(section));
+	if (option) {
+		UCI_ASSERT(ctx, uci_validate_name(option));
+		UCI_ASSERT(ctx, value != NULL);
+	} else {
+		UCI_ASSERT(ctx, uci_validate_str(value, false));
+	}
 
 	/*
 	 * look up the package, section and option (if set)
 	 * if the section/option is to be modified and it is not found
 	 * create a new element in the appropriate list
 	 */
-	UCI_TRAP_SAVE(ctx, notfound);
-	e = uci_lookup_list(ctx, &ctx->root, package);
+	e = uci_lookup_list(&p->sections, section);
 	if (!e)
 		goto notfound;
 
-	p = uci_to_package(e);
-	e = uci_lookup_list(ctx, &p->sections, section);
-	if (!e)
-		goto notfound;
 	s = uci_to_section(e);
+	if (ctx->pctx && ctx->pctx->merge)
+		ctx->pctx->section = s;
 
 	if (option) {
-		e = uci_lookup_list(ctx, &s->options, option);
+		e = uci_lookup_list(&s->options, option);
 		if (!e)
 			goto notfound;
 		o = uci_to_option(e);
 	}
-	UCI_TRAP_RESTORE(ctx);
 
 	/* 
 	 * no unknown element was supplied, assume that we can just update 
@@ -314,9 +723,13 @@ int uci_set(struct uci_context *ctx, char *package, char *section, char *option,
 		e = &o->e;
 	else
 		e = &s->e;
+	if (result)
+		*result = e;
+	else
+		result = &e;
 
-	uci_add_history(ctx, p, UCI_CMD_CHANGE, section, option, value);
-	return uci_set_element_value(ctx, &e, value);
+	ctx->internal = internal;
+	return uci_set_element_value(ctx, result, value);
 
 notfound:
 	/* 
@@ -326,34 +739,32 @@ notfound:
 	 * an option was supplied, but the section wasn't found
 	 */
 	if (!p || (!s && option))
-		UCI_THROW(ctx, ctx->errno);
+		UCI_THROW(ctx, UCI_ERR_NOTFOUND);
 
 	/* now add the missing entry */
-	uci_add_history(ctx, p, UCI_CMD_ADD, section, option, value);
-	if (s)
-		uci_alloc_option(s, option, value);
-	else
-		uci_alloc_section(p, section, value);
+	if (!internal && p->has_history)
+		uci_add_history(ctx, &p->history, UCI_CMD_CHANGE, section, option, value);
+	if (s) {
+		o = uci_alloc_option(s, option, value);
+		if (result)
+			*result = &o->e;
+	} else {
+		s = uci_alloc_section(p, value, section);
+		if (result)
+			*result = &s->e;
+		if (ctx->pctx && ctx->pctx->merge)
+			ctx->pctx->section = s;
+	}
 
 	return 0;
 }
 
-int uci_unload(struct uci_context *ctx, const char *name)
+int uci_unload(struct uci_context *ctx, struct uci_package *p)
 {
-	struct uci_element *e;
-
 	UCI_HANDLE_ERR(ctx);
-	UCI_ASSERT(ctx, name != NULL);
-
-	uci_foreach_element(&ctx->root, e) {
-		if (!strcmp(e->name, name))
-			goto found;
-	}
-	UCI_THROW(ctx, UCI_ERR_NOTFOUND);
-
-found:
-	uci_free_package(uci_to_package(e));
+	UCI_ASSERT(ctx, p != NULL);
 
+	uci_free_package(&p);
 	return 0;
 }