From: Felix Fietkau <nbd@openwrt.org>
Date: Tue, 29 Jan 2008 23:14:54 +0000 (+0100)
Subject: implement history parsing
X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=4aa3fd762e2190a4e418581cf24446484d0b7df5;p=oweals%2Fuci.git

implement history parsing
---

diff --git a/cli.c b/cli.c
index 410d7e8..e17acb5 100644
--- a/cli.c
+++ b/cli.c
@@ -176,7 +176,10 @@ static int uci_do_set(int argc, char **argv)
 		uci_perror(ctx, "uci");
 		return 1;
 	}
-	uci_commit(ctx, p);
+	if (uci_save(ctx, p) != UCI_OK) {
+		uci_perror(ctx, "uci");
+		return 1;
+	}
 	return 0;
 }
 
diff --git a/err.h b/err.h
index 2e1e606..078fdbe 100644
--- a/err.h
+++ b/err.h
@@ -27,6 +27,7 @@
  * in the context.
  */
 #define UCI_THROW(ctx, err) do { 	\
+	DPRINTF("Exception: %s in %s, %s:%d\n", #err, __func__, __FILE__, __LINE__); \
 	longjmp(ctx->trap, err); 	\
 } while (0)
 
@@ -40,10 +41,12 @@
  * and UCI_TRAP_RESTORE.
  */
 #define UCI_HANDLE_ERR(ctx) do {	\
-	int __val;			\
+	int __val = 0;			\
 	if (!ctx)			\
 		return UCI_ERR_INVAL;	\
-	__val = setjmp(ctx->trap);	\
+	if (!ctx->internal)		\
+		__val = setjmp(ctx->trap); \
+	ctx->internal = false;		\
 	if (__val) {			\
 		ctx->errno = __val;	\
 		return __val;		\
@@ -70,6 +73,11 @@
 	memcpy(ctx->trap, __old_trap, sizeof(ctx->trap)); \
 } while(0)
 
+#define UCI_INTERNAL(func, ctx, ...) do { \
+	ctx->internal = true;		\
+	func(ctx, __VA_ARGS__);		\
+} while (0);
+
 /*
  * check the specified condition.
  * throw an invalid argument exception if it's false
diff --git a/file.c b/file.c
index e6722b2..0e5992c 100644
--- a/file.c
+++ b/file.c
@@ -97,8 +97,6 @@ static void uci_file_cleanup(struct uci_context *ctx)
 
 	if (pctx->buf)
 		free(pctx->buf);
-	if (pctx->file)
-		fclose(pctx->file);
 
 	free(pctx);
 }
@@ -520,29 +518,152 @@ int uci_import(struct uci_context *ctx, FILE *stream, const char *name, struct u
 	return 0;
 }
 
+/*
+ * open a stream and go to the right position
+ *
+ * note: when opening for write and seeking to the beginning of
+ * the stream, truncate the file
+ */
+static FILE *uci_open_stream(struct uci_context *ctx, const char *filename, int pos, bool write)
+{
+	FILE *file = NULL;
+	int fd, ret;
+
+	fd = open(filename, (write ? O_RDWR | O_CREAT : O_RDONLY));
+	if (fd <= 0)
+		goto error;
+
+	if (flock(fd, (write ? LOCK_EX : LOCK_SH)) < 0)
+		goto error;
+
+	if (write && (pos == SEEK_SET))
+		ret = ftruncate(fd, 0);
+	else
+		ret = lseek(fd, 0, pos);
+
+	if (ret < 0)
+		goto error;
+
+	file = fdopen(fd, (write ? "w" : "r"));
+	if (file)
+		goto done;
+
+error:
+	UCI_THROW(ctx, UCI_ERR_IO);
+done:
+	return file;
+}
+
+static void uci_close_stream(FILE *stream)
+{
+	int fd;
+
+	if (!stream)
+		return;
+
+	fd = fileno(stream);
+	flock(fd, LOCK_UN);
+	fclose(stream);
+}
+
+static void uci_parse_history_line(struct uci_context *ctx, struct uci_package *p, char *buf)
+{
+	bool delete = false;
+	char *package = NULL;
+	char *section = NULL;
+	char *option = NULL;
+	char *value = NULL;
+
+	if (buf[0] == '-') {
+		delete = true;
+		buf++;
+	}
+
+	UCI_INTERNAL(uci_parse_tuple, ctx, buf, &package, &section, &option, &value);
+	if (!package || !section || !value)
+		goto error;
+	if (strcmp(package, p->e.name) != 0)
+		goto error;
+	if (!uci_validate_name(section))
+		goto error;
+	if (option && !uci_validate_name(option))
+		goto error;
+	if (!delete)
+		UCI_INTERNAL(uci_set, ctx, package, section, option, value);
+	return;
+
+error:
+	UCI_THROW(ctx, UCI_ERR_PARSE);
+}
+
+static void uci_parse_history(struct uci_context *ctx, FILE *stream, struct uci_package *p)
+{
+	struct uci_parse_context *pctx;
+
+	/* make sure no memory from previous parse attempts is leaked */
+	uci_file_cleanup(ctx);
+
+	pctx = (struct uci_parse_context *) uci_malloc(ctx, sizeof(struct uci_parse_context));
+	ctx->pctx = pctx;
+	pctx->file = stream;
+
+	rewind(stream);
+	while (!feof(pctx->file)) {
+		uci_getln(ctx, 0);
+		if (!pctx->buf[0])
+			continue;
+		uci_parse_history_line(ctx, p, pctx->buf);
+	}
+
+	/* no error happened, we can get rid of the parser context now */
+	uci_file_cleanup(ctx);
+}
+
+static void uci_load_history(struct uci_context *ctx, struct uci_package *p)
+{
+	char *filename;
+	FILE *f = NULL;
+
+	if (!p->confdir)
+		return;
+	if ((asprintf(&filename, "%s/%s", UCI_SAVEDIR, p->e.name) < 0) || !filename)
+		UCI_THROW(ctx, UCI_ERR_MEM);
+
+	UCI_TRAP_SAVE(ctx, done);
+	f = uci_open_stream(ctx, filename, SEEK_SET, false);
+	uci_parse_history(ctx, f, p);
+	UCI_TRAP_RESTORE(ctx);
+done:
+	uci_close_stream(f);
+	ctx->errno = 0;
+}
+
 int uci_load(struct uci_context *ctx, const char *name, struct uci_package **package)
 {
 	struct stat statbuf;
 	char *filename;
 	bool confdir;
-	FILE *file;
-	int fd;
+	FILE *file = NULL;
 
 	UCI_HANDLE_ERR(ctx);
 	UCI_ASSERT(ctx, name != NULL);
 
 	switch (name[0]) {
 	case '.':
+		/* relative path outside of /etc/config */
 		if (name[1] != '/')
 			UCI_THROW(ctx, UCI_ERR_NOTFOUND);
 		/* fall through */
 	case '/':
-		/* absolute/relative path outside of /etc/config */
+		/* absolute path outside of /etc/config */
 		filename = uci_strdup(ctx, name);
 		name = strrchr(name, '/') + 1;
 		confdir = false;
 		break;
 	default:
+		/* config in /etc/config */
+		if (strchr(name, '/'))
+			UCI_THROW(ctx, UCI_ERR_INVAL);
 		filename = uci_malloc(ctx, strlen(name) + sizeof(UCI_CONFDIR) + 2);
 		sprintf(filename, UCI_CONFDIR "/%s", name);
 		confdir = true;
@@ -554,17 +675,7 @@ int uci_load(struct uci_context *ctx, const char *name, struct uci_package **pac
 		UCI_THROW(ctx, UCI_ERR_NOTFOUND);
 	}
 
-	fd = open(filename, O_RDONLY);
-	if (fd <= 0)
-		UCI_THROW(ctx, UCI_ERR_IO);
-
-	if (flock(fd, LOCK_SH) < 0)
-		UCI_THROW(ctx, UCI_ERR_IO);
-
-	file = fdopen(fd, "r");
-	if (!file)
-		UCI_THROW(ctx, UCI_ERR_IO);
-
+	file = uci_open_stream(ctx, filename, SEEK_SET, false);
 	ctx->errno = 0;
 	UCI_TRAP_SAVE(ctx, done);
 	uci_import(ctx, file, name, package, true);
@@ -573,50 +684,82 @@ int uci_load(struct uci_context *ctx, const char *name, struct uci_package **pac
 	if (*package) {
 		(*package)->path = filename;
 		(*package)->confdir = confdir;
+		uci_load_history(ctx, *package);
 	}
 
 done:
-	flock(fd, LOCK_UN);
-	fclose(file);
+	uci_close_stream(file);
 	return ctx->errno;
 }
 
-int uci_commit(struct uci_context *ctx, struct uci_package *p)
+int uci_save(struct uci_context *ctx, struct uci_package *p)
 {
 	FILE *f = NULL;
-	int fd = 0;
-	int err = UCI_ERR_IO;
+	char *filename = NULL;
+	struct uci_element *e, *tmp;
 
 	UCI_HANDLE_ERR(ctx);
 	UCI_ASSERT(ctx, p != NULL);
-	UCI_ASSERT(ctx, p->path != NULL);
 
-	fd = open(p->path, O_RDWR);
-	if (fd < 0)
-		goto done;
+	/* 
+	 * if the config file was outside of the /etc/config path,
+	 * don't save the history to a file, update the real file
+	 * directly
+	 */
+	if (!p->confdir)
+		return uci_commit(ctx, p);
 
-	if (flock(fd, LOCK_EX) < 0)
-		goto done;
+	if (uci_list_empty(&p->history))
+		return 0;
 
-	ftruncate(fd, 0);
-	f = fdopen(fd, "w");
-	if (!f)
-		goto done;
+	if ((asprintf(&filename, "%s/%s", UCI_SAVEDIR, p->e.name) < 0) || !filename)
+		UCI_THROW(ctx, UCI_ERR_MEM);
 
+	ctx->errno = 0;
 	UCI_TRAP_SAVE(ctx, done);
-	uci_export(ctx, f, p, false);
+	f = uci_open_stream(ctx, filename, SEEK_END, true);
 	UCI_TRAP_RESTORE(ctx);
 
+	uci_foreach_element_safe(&p->history, tmp, e) {
+		struct uci_history *h = uci_to_history(e);
+		if (h->cmd == UCI_CMD_REMOVE)
+			fprintf(f, "-");
+		fprintf(f, "%s.%s", p->e.name, h->section);
+		if (e->name)
+			fprintf(f, ".%s", e->name);
+		fprintf(f, "=%s\n", h->value);
+		uci_list_del(&e->list);
+	}
+
 done:
-	if (f)
-		fclose(f);
-	else if (fd > 0)
-		close(fd);
+	uci_close_stream(f);
+	if (filename)
+		free(filename);
+	if (ctx->errno)
+		UCI_THROW(ctx, ctx->errno);
+
+	return 0;
+}
+
+int uci_commit(struct uci_context *ctx, struct uci_package *p)
+{
+	FILE *f = NULL;
 
+	UCI_HANDLE_ERR(ctx);
+	UCI_ASSERT(ctx, p != NULL);
+	UCI_ASSERT(ctx, p->path != NULL);
+
+	f = uci_open_stream(ctx, p->path, SEEK_SET, true);
+
+	UCI_TRAP_SAVE(ctx, done);
+	uci_export(ctx, f, p, false);
+	UCI_TRAP_RESTORE(ctx);
+
+done:
+	uci_close_stream(f);
 	if (ctx->errno)
 		UCI_THROW(ctx, ctx->errno);
-	if (err)
-		UCI_THROW(ctx, UCI_ERR_IO);
+
 	return 0;
 }
 
@@ -679,4 +822,3 @@ char **uci_list_configs(struct uci_context *ctx)
 	return configs;
 }
 
-
diff --git a/list.c b/list.c
index d78970c..19fe8c5 100644
--- a/list.c
+++ b/list.c
@@ -58,13 +58,18 @@ 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);
+	if (name)
+		datalen += 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) {
+		e->name = (char *) ptr + size;
+		strcpy(e->name, name);
+	}
 	uci_list_init(&e->list);
 
 	return e;
@@ -165,17 +170,19 @@ uci_free_package(struct uci_package *p)
 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));
+	struct uci_history *h;
+	int size = 0;
+	char *ptr;
 
-	uci_list_init(&h->list);
+	h = uci_alloc_element(ctx, history, option, strlen(section) + strlen(value) + 2);
+	ptr = uci_dataptr(h);
 	h->cmd = cmd;
-	h->section = section;
-	h->option = option;
-	h->value = value;
-	uci_list_add(&p->history, &h->list);
+	h->section = strcpy(ptr, section);
+	ptr += strlen(ptr) + 1;
+	h->value = strcpy(ptr, value);
+	uci_list_add(&p->history, &h->e.list);
 }
 
-
 static struct uci_element *uci_lookup_list(struct uci_context *ctx, struct uci_list *list, const char *name)
 {
 	struct uci_element *e;
@@ -217,14 +224,15 @@ notfound:
 
 int uci_set_element_value(struct uci_context *ctx, struct uci_element **element, char *value)
 {
-	int size;
-	char *str;
+	bool internal = ctx->internal;
 	struct uci_list *list;
 	struct uci_element *e;
 	struct uci_package *p;
 	struct uci_section *s;
 	char *section;
 	char *option;
+	char *str;
+	int size;
 
 	UCI_HANDLE_ERR(ctx);
 	UCI_ASSERT(ctx, value != NULL);
@@ -260,7 +268,8 @@ int uci_set_element_value(struct uci_context *ctx, struct uci_element **element,
 		return 0;
 	}
 	p = s->package;
-	uci_add_history(ctx, p, UCI_CMD_CHANGE, section, option, value);
+	if (!internal)
+		uci_add_history(ctx, p, UCI_CMD_CHANGE, section, option, value);
 
 	uci_list_del(&e->list);
 	e = uci_realloc(ctx, e, size);
@@ -270,10 +279,10 @@ 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)->value = str;
 		break;
 	default:
 		break;
@@ -289,6 +298,7 @@ int uci_set(struct uci_context *ctx, char *package, char *section, char *option,
 	struct uci_section *s = NULL;
 	struct uci_option *o = NULL;
 	struct uci_history *h;
+	bool internal = ctx->internal;
 
 	UCI_HANDLE_ERR(ctx);
 	UCI_ASSERT(ctx, package != NULL);
@@ -326,7 +336,11 @@ int uci_set(struct uci_context *ctx, char *package, char *section, char *option,
 	else
 		e = &s->e;
 
-	return uci_set_element_value(ctx, &e, value);
+	if (!internal)
+		return uci_set_element_value(ctx, &e, value);
+
+	UCI_INTERNAL(uci_set_element_value, ctx, &e, value);
+	return 0;
 
 notfound:
 	/* 
@@ -339,7 +353,8 @@ notfound:
 		UCI_THROW(ctx, UCI_ERR_NOTFOUND);
 
 	/* now add the missing entry */
-	uci_add_history(ctx, p, UCI_CMD_ADD, section, option, value);
+	if (!internal)
+		uci_add_history(ctx, p, UCI_CMD_ADD, section, option, value);
 	if (s)
 		uci_alloc_option(s, option, value);
 	else
diff --git a/uci.h b/uci.h
index 0cb352d..891fb3b 100644
--- a/uci.h
+++ b/uci.h
@@ -34,6 +34,7 @@
 #include <stdio.h>
 
 #define UCI_CONFDIR "/etc/config"
+#define UCI_SAVEDIR "/tmp/.uci"
 
 enum
 {
@@ -174,6 +175,13 @@ extern int uci_set_element_value(struct uci_context *ctx, struct uci_element **e
  */
 extern int uci_set(struct uci_context *ctx, char *package, char *section, char *option, char *value);
 
+/**
+ * uci_save: save change history for a package
+ * @ctx: uci context
+ * @p: uci_package struct
+ */
+extern int uci_save(struct uci_context *ctx, struct uci_package *p);
+
 /**
  * uci_commit: commit changes to a package
  * @ctx: uci context
@@ -190,9 +198,10 @@ extern char **uci_list_configs(struct uci_context *ctx);
 
 /* UCI data structures */
 enum uci_type {
-	UCI_TYPE_PACKAGE = 0,
-	UCI_TYPE_SECTION = 1,
-	UCI_TYPE_OPTION = 2
+	UCI_TYPE_HISTORY = 0,
+	UCI_TYPE_PACKAGE = 1,
+	UCI_TYPE_SECTION = 2,
+	UCI_TYPE_OPTION = 3
 };
 
 struct uci_element
@@ -214,6 +223,7 @@ struct uci_context
 	int errno;
 	const char *func;
 	jmp_buf trap;
+	bool internal;
 	char *buf;
 	int bufsz;
 };
@@ -270,10 +280,9 @@ enum uci_command {
 
 struct uci_history
 {
-	struct uci_list list;
+	struct uci_element e;
 	enum uci_command cmd;
 	char *section;
-	char *option;
 	char *value;
 };
 
@@ -342,6 +351,7 @@ struct uci_history
 #define uci_list_empty(list) ((list)->next == (list))
 
 /* wrappers for dynamic type handling */
+#define uci_type_history UCI_TYPE_HISTORY
 #define uci_type_package UCI_TYPE_PACKAGE
 #define uci_type_section UCI_TYPE_SECTION
 #define uci_type_option UCI_TYPE_OPTION
@@ -349,9 +359,10 @@ struct uci_history
 /* element typecasting */
 #ifdef UCI_DEBUG_TYPECAST
 static const char *uci_typestr[] = {
+	[uci_type_history] = "history",
 	[uci_type_package] = "package",
 	[uci_type_section] = "section",
-	[uci_type_option] = "option"
+	[uci_type_option] = "option",
 };
 
 static void uci_typecast_error(int from, int to)
@@ -368,11 +379,13 @@ static void uci_typecast_error(int from, int to)
 		return (struct uci_ ## _type *) e; \
 	}
 
+BUILD_CAST(history)
 BUILD_CAST(package)
 BUILD_CAST(section)
 BUILD_CAST(option)
 
 #else
+#define uci_to_history(ptr) container_of(ptr, struct uci_history, e)
 #define uci_to_package(ptr) container_of(ptr, struct uci_package, e)
 #define uci_to_section(ptr) container_of(ptr, struct uci_section, e)
 #define uci_to_option(ptr)  container_of(ptr, struct uci_option, e)