some backend abstraction

diff --git a/cli.c b/cli.c
index be479c43e7d58bd75c843ab30b6c31abd5393164..287ef9681d1636efbbbb7c4b1d646a31cd22f999 100644 (file)
--- a/cli.c
+++ b/cli.c
@@ -403,7 +403,6 @@ static int uci_batch(void)
                        fprintf(stderr, "Unknown command\n");
 
                /* clean up */
-               uci_cleanup(ctx);
                uci_foreach_element_safe(&ctx->root, tmp, e) {
                        uci_unload(ctx, uci_to_package(e));
                }

diff --git a/file.c b/file.c
index 7049b3393d78f29dfc87efecbf22e964bf543c42..62ab1a8f5af25885032008b30f59fbc48a66097a 100644 (file)
--- a/file.c
+++ b/file.c
@@ -25,13 +25,7 @@
 #include <stdio.h>
 #include <ctype.h>
 
-/*
- * Clean up all extra memory used by the parser and exporter
- */
-static void uci_file_cleanup(struct uci_context *ctx)
-{
-}
-
+static struct uci_backend uci_file_backend;
 
 /*
  * verify that the end of the line or command is reached.
@@ -61,6 +55,7 @@ static void uci_switch_config(struct uci_context *ctx)
 
        /* add the last config to main config file list */
        if (pctx->package) {
+               pctx->package->backend = ctx->backend;
                uci_list_add(&ctx->root, &pctx->package->e.list);
 
                pctx->package = NULL;
@@ -298,7 +293,8 @@ int uci_import(struct uci_context *ctx, FILE *stream, const char *name, struct u
        UCI_HANDLE_ERR(ctx);
 
        /* make sure no memory from previous parse attempts is leaked */
-       uci_file_cleanup(ctx);
+       ctx->internal = true;
+       uci_cleanup(ctx);
 
        uci_alloc_parse_context(ctx);
        pctx = ctx->pctx;
@@ -343,7 +339,7 @@ error:
        uci_switch_config(ctx);
 
        /* no error happened, we can get rid of the parser context now */
-       uci_file_cleanup(ctx);
+       uci_cleanup(ctx);
 
        return 0;
 }
@@ -360,62 +356,13 @@ static char *uci_config_path(struct uci_context *ctx, const char *name)
        return filename;
 }
 
-int uci_load(struct uci_context *ctx, const char *name, struct uci_package **package)
-{
-       char *filename;
-       bool confdir;
-       FILE *file = NULL;
-
-       UCI_HANDLE_ERR(ctx);
-
-       switch (name[0]) {
-       case '.':
-               /* relative path outside of /etc/config */
-               if (name[1] != '/')
-                       UCI_THROW(ctx, UCI_ERR_NOTFOUND);
-               /* fall through */
-       case '/':
-               /* absolute path outside of /etc/config */
-               filename = uci_strdup(ctx, name);
-               name = strrchr(name, '/') + 1;
-               confdir = false;
-               break;
-       default:
-               /* config in /etc/config */
-               filename = uci_config_path(ctx, name);
-               confdir = true;
-               break;
-       }
-
-       file = uci_open_stream(ctx, filename, SEEK_SET, false, false);
-       ctx->errno = 0;
-       UCI_TRAP_SAVE(ctx, done);
-       UCI_INTERNAL(uci_import, ctx, file, name, package, true);
-       UCI_TRAP_RESTORE(ctx);
-
-       if (*package) {
-               (*package)->path = filename;
-               (*package)->confdir = confdir;
-               uci_load_history(ctx, *package, false);
-       }
-
-done:
-       uci_close_stream(file);
-       return ctx->errno;
-}
-
-int uci_commit(struct uci_context *ctx, struct uci_package **package, bool overwrite)
+void uci_file_commit(struct uci_context *ctx, struct uci_package **package, bool overwrite)
 {
-       struct uci_package *p;
+       struct uci_package *p = *package;
        FILE *f = NULL;
        char *name = NULL;
        char *path = NULL;
 
-       UCI_HANDLE_ERR(ctx);
-       UCI_ASSERT(ctx, package != NULL);
-       p = *package;
-
-       UCI_ASSERT(ctx, p != NULL);
        if (!p->path) {
                if (overwrite)
                        p->path = uci_config_path(ctx, p->e.name);
@@ -423,7 +370,6 @@ int uci_commit(struct uci_context *ctx, struct uci_package **package, bool overw
                        UCI_THROW(ctx, UCI_ERR_INVAL);
        }
 
-
        /* open the config file for writing now, so that it is locked */
        f = uci_open_stream(ctx, p->path, SEEK_SET, true, true);
 
@@ -442,7 +388,7 @@ int uci_commit(struct uci_context *ctx, struct uci_package **package, bool overw
                         * as well. dump and reload 
                         */
                        uci_free_package(&p);
-                       uci_file_cleanup(ctx);
+                       uci_cleanup(ctx);
                        UCI_INTERNAL(uci_import, ctx, f, name, &p, true);
 
                        p->path = path;
@@ -476,8 +422,6 @@ done:
        uci_close_stream(f);
        if (ctx->errno)
                UCI_THROW(ctx, ctx->errno);
-
-       return 0;
 }
 
 
@@ -543,3 +487,53 @@ int uci_list_configs(struct uci_context *ctx, char ***list)
        return 0;
 }
 
+static struct uci_package *uci_file_load(struct uci_context *ctx, const char *name)
+{
+       struct uci_package *package = NULL;
+       char *filename;
+       bool confdir;
+       FILE *file = NULL;
+
+       switch (name[0]) {
+       case '.':
+               /* relative path outside of /etc/config */
+               if (name[1] != '/')
+                       UCI_THROW(ctx, UCI_ERR_NOTFOUND);
+               /* fall through */
+       case '/':
+               /* absolute path outside of /etc/config */
+               filename = uci_strdup(ctx, name);
+               name = strrchr(name, '/') + 1;
+               confdir = false;
+               break;
+       default:
+               /* config in /etc/config */
+               filename = uci_config_path(ctx, name);
+               confdir = true;
+               break;
+       }
+
+       file = uci_open_stream(ctx, filename, SEEK_SET, false, false);
+       ctx->errno = 0;
+       UCI_TRAP_SAVE(ctx, done);
+       UCI_INTERNAL(uci_import, ctx, file, name, &package, true);
+       UCI_TRAP_RESTORE(ctx);
+
+       if (package) {
+               package->path = filename;
+               package->confdir = confdir;
+               uci_load_history(ctx, package, false);
+       }
+
+done:
+       uci_close_stream(file);
+       if (ctx->errno)
+               UCI_THROW(ctx, ctx->errno);
+       return package;
+}
+
+static struct uci_backend uci_file_backend = {
+       .name = "file",
+       .load = uci_file_load,
+       .commit = uci_file_commit,
+};

diff --git a/history.c b/history.c
index 75e3f406649e97415f42e4b1a304ad7e2574bf85..089bcef67d75ee6a287537e1e01b2550fdc3cf18 100644 (file)
--- a/history.c
+++ b/history.c
@@ -162,7 +162,6 @@ static int uci_parse_history(struct uci_context *ctx, FILE *stream, struct uci_p
        int changes = 0;
 
        /* make sure no memory from previous parse attempts is leaked */
-       ctx->internal = true;
        uci_cleanup(ctx);
 
        pctx = (struct uci_parse_context *) uci_malloc(ctx, sizeof(struct uci_parse_context));
@@ -187,7 +186,6 @@ error:
        }
 
        /* no error happened, we can get rid of the parser context now */
-       ctx->internal = true;
        uci_cleanup(ctx);
        return changes;
 }
@@ -311,7 +309,6 @@ done:
        uci_foreach_element_safe(&list, tmp, e) {
                uci_free_element(e);
        }
-       ctx->internal = true;
        uci_cleanup(ctx);
 }
 

diff --git a/libuci.c b/libuci.c
index 118289b3eb77b72e6ac864b28e9dbdb5c7a93354..4985a33590bb390b8ddd53ee5233a604a235ec55 100644 (file)
--- a/libuci.c
+++ b/libuci.c
@@ -39,6 +39,8 @@ static const char *uci_errstr[] = {
        [UCI_ERR_UNKNOWN] =   "Unknown error",
 };
 
+static void uci_cleanup(struct uci_context *ctx);
+
 #include "uci_internal.h"
 #include "util.c"
 #include "list.c"
@@ -58,6 +60,7 @@ struct uci_context *uci_alloc_context(void)
 
        ctx->confdir = (char *) uci_confdir;
        ctx->savedir = (char *) uci_savedir;
+       ctx->backend = &uci_file_backend;
 
        return ctx;
 }
@@ -71,9 +74,8 @@ void uci_free_context(struct uci_context *ctx)
        if (ctx->savedir != uci_savedir)
                free(ctx->savedir);
 
-       UCI_TRAP_SAVE(ctx, ignore);
-       ctx->internal = true;
        uci_cleanup(ctx);
+       UCI_TRAP_SAVE(ctx, ignore);
        uci_foreach_element_safe(&ctx->root, tmp, e) {
                struct uci_package *p = uci_to_package(e);
                uci_free_package(&p);
@@ -102,10 +104,9 @@ int uci_set_confdir(struct uci_context *ctx, const char *dir)
        return 0;
 }
 
-int uci_cleanup(struct uci_context *ctx)
+static void uci_cleanup(struct uci_context *ctx)
 {
        struct uci_parse_context *pctx;
-       UCI_HANDLE_ERR(ctx);
 
        if (ctx->buf) {
                free(ctx->buf);
@@ -115,7 +116,7 @@ int uci_cleanup(struct uci_context *ctx)
 
        pctx = ctx->pctx;
        if (!pctx)
-               goto done;
+               return;
 
        ctx->pctx = NULL;
        if (pctx->package)
@@ -125,8 +126,6 @@ int uci_cleanup(struct uci_context *ctx)
                free(pctx->buf);
 
        free(pctx);
-done:
-       return 0;
 }
 
 void uci_perror(struct uci_context *ctx, const char *prefix)
@@ -159,4 +158,26 @@ void uci_perror(struct uci_context *ctx, const char *prefix)
        }
 }
 
+int uci_commit(struct uci_context *ctx, struct uci_package **package, bool overwrite)
+{
+       UCI_HANDLE_ERR(ctx);
+       UCI_ASSERT(ctx, package != NULL);
+       UCI_ASSERT(ctx, *package != NULL);
+       UCI_ASSERT(ctx, ctx->backend && ctx->backend->commit);
+       ctx->backend->commit(ctx, package, overwrite);
+       return 0;
+}
+
+int uci_load(struct uci_context *ctx, const char *name, struct uci_package **package)
+{
+       struct uci_package *p;
+       UCI_HANDLE_ERR(ctx);
+       UCI_ASSERT(ctx, ctx->backend && ctx->backend->load);
+       p = ctx->backend->load(ctx, name);
+       if (package)
+               *package = p;
+
+       return 0;
+}
+
 

diff --git a/uci.h b/uci.h
index 8f4fa7125ac66edf0bbc0a832d4f25ed5e1e2605..2fbcb80e204f7d78908d86113fc39a8c0d6bdc41 100644 (file)
--- a/uci.h
+++ b/uci.h
@@ -63,6 +63,7 @@ struct uci_section;
 struct uci_option;
 struct uci_history;
 struct uci_context;
+struct uci_backend;
 struct uci_parse_context;
 
 
@@ -135,13 +136,6 @@ extern int uci_load(struct uci_context *ctx, const char *name, struct uci_packag
  */
 extern int uci_unload(struct uci_context *ctx, struct uci_package *p);
 
-/**
- * uci_cleanup: Clean up after an error
- *
- * @ctx: uci context
- */
-extern int uci_cleanup(struct uci_context *ctx);
-
 /**
  * uci_lookup: Look up an uci element
  *
@@ -302,6 +296,14 @@ struct uci_element
        char *name;
 };
 
+struct uci_backend
+{
+       const char *name;
+       struct uci_package *(*load)(struct uci_context *ctx, const char *name);
+       void (*commit)(struct uci_context *ctx, struct uci_package **p, bool overwrite);
+};
+
+
 struct uci_context
 {
        /* list of config packages */
@@ -310,6 +312,9 @@ struct uci_context
        /* parser context, use for error handling only */
        struct uci_parse_context *pctx;
 
+       /* backend for import and export */
+       struct uci_backend *backend;
+
        /* uci runtime flags */
        enum uci_flags flags;
 
@@ -337,6 +342,7 @@ struct uci_package
        char *path;
 
        /* private: */
+       struct uci_backend *backend;
        int n_section;
        struct uci_list history;
        struct uci_list saved_history;