move export functionality to libuci

[project/uci.git] / file.c

diff --git a/file.c b/file.c
index da72bde..c92e60b 100644 (file)
--- a/file.c
+++ b/file.c
@@ -67,12 +67,17 @@ static void uci_getln(struct uci_context *ctx, int offset)
 }
 
 /*
- * Clean up all extra memory used by the parser
+ * Clean up all extra memory used by the parser and exporter
  */
-static void uci_parse_cleanup(struct uci_context *ctx)
+static void uci_file_cleanup(struct uci_context *ctx)
 {
        struct uci_parse_context *pctx;
 
+       if (ctx->buf) {
+               free(ctx->buf);
+               ctx->bufsz = 0;
+       }
+
        pctx = ctx->pctx;
        if (!pctx)
                return;
@@ -428,12 +433,92 @@ static void uci_parse_line(struct uci_context *ctx)
        }
 }
 
+/* max number of characters that escaping adds to the string */
+#define UCI_QUOTE_ESCAPE       "'\\'"
+
+/*
+ * escape an uci string for export
+ */
+static char *uci_escape(struct uci_context *ctx, char *str)
+{
+       char *s, *p, *t;
+       int pos = 0;
+
+       if (!ctx->buf) {
+               ctx->bufsz = LINEBUF;
+               ctx->buf = malloc(LINEBUF);
+       }
+
+       s = str;
+       p = strchr(str, '\'');
+       if (!p)
+               return str;
+
+       do {
+               int len = p - s;
+               if (len > 0) {
+                       if (p + sizeof(UCI_QUOTE_ESCAPE) - str >= ctx->bufsz) {
+                               ctx->bufsz *= 2;
+                               ctx->buf = realloc(ctx->buf, ctx->bufsz);
+                               if (!ctx->buf)
+                                       UCI_THROW(ctx, UCI_ERR_MEM);
+                       }
+                       memcpy(&ctx->buf[pos], s, len);
+                       pos += len;
+               }
+               strcpy(&ctx->buf[pos], UCI_QUOTE_ESCAPE);
+               pos += sizeof(UCI_QUOTE_ESCAPE);
+               s = p + 1;
+       } while ((p = strchr(s, '\'')));
+
+       return ctx->buf;
+}
+
+
+/*
+ * export a single config package to a file stream
+ */
+static void uci_export_config(struct uci_config *cfg, FILE *stream)
+{
+       struct uci_context *ctx = cfg->ctx;
+       struct uci_section *s;
+       struct uci_option *o;
+
+       fprintf(stream, "package '%s'\n", uci_escape(ctx, cfg->name));
+       uci_foreach_entry(section, &cfg->sections, s) {
+               fprintf(stream, "\nconfig '%s'", uci_escape(ctx, s->type));
+               fprintf(stream, " '%s'\n", uci_escape(ctx, s->name));
+               uci_foreach_entry(option, &s->options, o) {
+                       fprintf(stream, "\toption '%s'", uci_escape(ctx, o->name));
+                       fprintf(stream, " '%s'\n", uci_escape(ctx, o->value));
+               }
+       }
+       fprintf(stream, "\n");
+}
+
+int uci_export(struct uci_context *ctx, FILE *stream, struct uci_config *cfg)
+{
+       UCI_HANDLE_ERR(ctx);
+       UCI_ASSERT(ctx, stream != NULL);
+
+       if (cfg) {
+               uci_export_config(cfg, stream);
+               goto done;
+       }
+
+       uci_foreach_entry(config, &ctx->root, cfg) {
+               uci_export_config(cfg, stream);
+       }
+done:
+       return 0;
+}
+
 int uci_import(struct uci_context *ctx, FILE *stream, const char *name, struct uci_config **cfg)
 {
        struct uci_parse_context *pctx;
 
        /* make sure no memory from previous parse attempts is leaked */
-       uci_parse_cleanup(ctx);
+       uci_file_cleanup(ctx);
 
        pctx = (struct uci_parse_context *) uci_malloc(ctx, sizeof(struct uci_parse_context));
        ctx->pctx = pctx;
@@ -460,7 +545,7 @@ int uci_import(struct uci_context *ctx, FILE *stream, const char *name, struct u
        uci_switch_config(ctx);
 
        /* no error happened, we can get rid of the parser context now */
-       uci_parse_cleanup(ctx);
+       uci_file_cleanup(ctx);
 
        return 0;
 }