[PATCH 3/3] notmuch-restore: allocate a temporary talloc context for each line parsed.

[david@tethera.net]

From: David Bremner <bremner@debian.org>

This lets the high level code in notmuch restore be ignorant about
what the lower level code is doing as far as allocating memory.
---
 notmuch-restore.c |   12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/notmuch-restore.c b/notmuch-restore.c
index 4b76d83..52e7ecb 100644
--- a/notmuch-restore.c
+++ b/notmuch-restore.c
@@ -122,6 +122,7 @@ notmuch_restore_command (unused (void *ctx), int argc, char *argv[])
     char *input_file_name = NULL;
     FILE *input = stdin;
     char *line = NULL;
+    void *line_ctx = NULL;
     size_t line_size;
     ssize_t line_len;
 
@@ -205,10 +206,11 @@ notmuch_restore_command (unused (void *ctx), int argc, char *argv[])
     do {
 	char *query_string;
 
+	line_ctx = talloc_new (ctx);
 	if (input_format == DUMP_FORMAT_SUP) {
-	    ret = parse_sup_line (ctx, line, &query_string, tag_ops);
+	    ret = parse_sup_line (line_ctx, line, &query_string, tag_ops);
 	} else {
-	    ret = parse_tag_line (ctx, line, TAG_FLAG_BE_GENEROUS,
+	    ret = parse_tag_line (line_ctx, line, TAG_FLAG_BE_GENEROUS,
 				  &query_string, tag_ops);
 
 	    if (ret == 0) {
@@ -238,8 +240,14 @@ notmuch_restore_command (unused (void *ctx), int argc, char *argv[])
 		break;
 	}
 
+	talloc_free (line_ctx);
+	/* setting to NULL is important to avoid a double free */
+	line_ctx = NULL;
     }  while ((line_len = getline (&line, &line_size, input)) != -1);
 
+    if (line_ctx != NULL)
+	talloc_free (line_ctx);
+
     if (input_format == DUMP_FORMAT_SUP)
 	regfree (&regex);
 
-- 
1.7.10.4