From 4c95913eae05b8a0b1c8e8e6ff219b9d710d564a Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@openwrt.org>
Date: Mon, 28 Jan 2008 04:07:48 +0100
Subject: [PATCH] implement uci_commit()

---
 cli.c  |  4 ++--
 file.c | 49 +++++++++++++++++++++++++++++++++++++++++++++----
 uci.h  | 10 +++++++++-
 3 files changed, 56 insertions(+), 7 deletions(-)

diff --git a/cli.c b/cli.c
index 8ab3850..1fa1cb1 100644
--- a/cli.c
+++ b/cli.c
@@ -105,7 +105,7 @@ static int uci_do_export(int argc, char **argv)
 			ret = uci_load(ctx, *p, &package);
 			if (ret)
 				continue;
-			uci_export(ctx, stdout, package);
+			uci_export(ctx, stdout, package, true);
 			uci_unload(ctx, package);
 		}
 	}
@@ -209,7 +209,7 @@ static int uci_do_set(int argc, char **argv)
 		uci_perror(ctx, "uci");
 		return 1;
 	}
-	uci_show_package(p, NULL);
+	uci_commit(ctx, p);
 	return 0;
 }
 
diff --git a/file.c b/file.c
index 4650a96..e8f0684 100644
--- a/file.c
+++ b/file.c
@@ -19,6 +19,7 @@
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <stdbool.h>
+#include <unistd.h>
 #include <fcntl.h>
 #include <stdio.h>
 #include <ctype.h>
@@ -454,7 +455,7 @@ static char *uci_escape(struct uci_context *ctx, char *str)
 /*
  * export a single config package to a file stream
  */
-static void uci_export_package(struct uci_package *p, FILE *stream)
+static void uci_export_package(struct uci_package *p, FILE *stream, bool header)
 {
 	struct uci_context *ctx = p->ctx;
 	struct uci_element *s, *o;
@@ -473,7 +474,7 @@ static void uci_export_package(struct uci_package *p, FILE *stream)
 	fprintf(stream, "\n");
 }
 
-int uci_export(struct uci_context *ctx, FILE *stream, struct uci_package *package)
+int uci_export(struct uci_context *ctx, FILE *stream, struct uci_package *package, bool header)
 {
 	struct uci_element *e;
 
@@ -481,12 +482,12 @@ int uci_export(struct uci_context *ctx, FILE *stream, struct uci_package *packag
 	UCI_ASSERT(ctx, stream != NULL);
 
 	if (package) {
-		uci_export_package(package, stream);
+		uci_export_package(package, stream, header);
 		goto done;
 	}
 
 	uci_foreach_element(&ctx->root, e) {
-		uci_export_package(uci_to_package(e), stream);
+		uci_export_package(uci_to_package(e), stream, header);
 	}
 done:
 	return 0;
@@ -590,6 +591,46 @@ done:
 	return ctx->errno;
 }
 
+int uci_commit(struct uci_context *ctx, struct uci_package *p)
+{
+	FILE *f = NULL;
+	int fd = 0;
+	int err = UCI_ERR_IO;
+
+	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 (flock(fd, LOCK_EX) < 0)
+		goto done;
+
+	ftruncate(fd, 0);
+	f = fdopen(fd, "w");
+	if (!f)
+		goto done;
+
+	UCI_TRAP_SAVE(ctx, done);
+	uci_export(ctx, f, p, false);
+	UCI_TRAP_RESTORE(ctx);
+
+done:
+	if (f)
+		fclose(f);
+	else if (fd > 0)
+		close(fd);
+
+	if (ctx->errno)
+		UCI_THROW(ctx, ctx->errno);
+	if (err)
+		UCI_THROW(ctx, UCI_ERR_IO);
+	return 0;
+}
+
+
 /* 
  * This function returns the filename by returning the string
  * after the last '/' character. By checking for a non-'\0'
diff --git a/uci.h b/uci.h
index 4420af7..4749985 100644
--- a/uci.h
+++ b/uci.h
@@ -95,8 +95,9 @@ extern int uci_import(struct uci_context *ctx, FILE *stream, const char *name, s
  * @ctx: uci context
  * @stream: output stream
  * @package: (optional) uci config package to export
+ * @header: include the package header
  */
-extern int uci_export(struct uci_context *ctx, FILE *stream, struct uci_package *package);
+extern int uci_export(struct uci_context *ctx, FILE *stream, struct uci_package *package, bool header);
 
 /**
  * uci_load: Parse an uci config file and store it in the uci context
@@ -157,6 +158,13 @@ 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_commit: commit changes to a package
+ * @ctx: uci context
+ * @p: uci_package struct
+ */
+extern int uci_commit(struct uci_context *ctx, struct uci_package *p);
+
 /**
  * uci_list_configs: List available uci config files
  *
-- 
2.25.1