Re: [PATCH 2/2] notmuch-restore: handle empty input file, leading blank lines and comments.

[Tomi Ollila <tomi.ollila@iki.fi>]

On Wed, Dec 26 2012, david@tethera.net wrote:

> From: David Bremner <bremner@debian.org>
>
> This patch corrects several undesirable behaviours:
>
> 1) Empty files were not detected, leading to buffer read overrun.
>
> 2) An initial blank line cause restore to silently abort
>
> 3) Initial comment line caused format detection to fail
> ---
>  notmuch-restore.c |   17 ++++++++++++-----
>  test/dump-restore |    3 ---
>  2 files changed, 12 insertions(+), 8 deletions(-)
>
> diff --git a/notmuch-restore.c b/notmuch-restore.c
> index 9ed9b51..c93f1ac 100644
> --- a/notmuch-restore.c
> +++ b/notmuch-restore.c
> @@ -180,11 +180,6 @@ notmuch_restore_command (unused (void *ctx), int argc, char *argv[])
>  		 argv[opt_index]);
>  	return 1;
>      }
> -    char *p;
> -
> -    line_len = getline (&line, &line_size, input);
> -    if (line_len == 0)
> -	return 0;
>  
>      tag_ops = tag_op_list_create (ctx);
>      if (tag_ops == NULL) {
> @@ -192,6 +187,18 @@ notmuch_restore_command (unused (void *ctx), int argc, char *argv[])
>  	return 1;
>      }
>  
> +    do {
> +	line_len = getline (&line, &line_size, input);
> +
> +	/* empty input file not considered an error */
> +	if (line_len < 0)
> +	    return 0;
> +
> +    } while ((line_len == 0) ||
> +	     (line[0] == '#') ||
> +	     (strspn (line, " \t\n") == strlen (line)));

The strspn -- strlen doesn't take embedded \0:s in input line
into consideration (and strlen() scans the full line again),

     (strspn (line, " \t\n") == line_len));

might better

(if not, then  line[strspn(line, " \t\n")] == '\0'  would drop length scan)

Otherwise LGTM.

Tomi

> +
> +    char *p;
>      for (p = line; (input_format == DUMP_FORMAT_AUTO) && *p; p++) {
>  	if (*p == '(')
>  	    input_format = DUMP_FORMAT_SUP;
> diff --git a/test/dump-restore b/test/dump-restore
> index c2ddb92..ae30cd1 100755
> --- a/test/dump-restore
> +++ b/test/dump-restore
> @@ -146,13 +146,11 @@ cat <<EOF > comments-and-blanks
>  EOF
>  
>  test_begin_subtest 'restoring empty file is not an error'
> -test_subtest_known_broken
>  notmuch restore < /dev/null 2>OUTPUT.$test_count
>  cp /dev/null EXPECTED
>  test_expect_equal_file EXPECTED OUTPUT.$test_count
>  
>  test_begin_subtest 'file of comments and blank lines is not an error'
> -test_subtest_known_broken
>  notmuch restore --input=comments-and-blanks
>  ret_val=$?
>  test_expect_equal "$ret_val" "0"
> @@ -172,7 +170,6 @@ echo "yun1vjwegii.fsf@aiko.keithp.com (another_tag)" \
>      >> leading-comments-blanks-sup
>  
>  test_begin_subtest 'detect format=sup with leading comments and blanks'
> -test_subtest_known_broken
>  notmuch restore --input=leading-comments-blanks-sup
>  notmuch search --output=tags id:yun1vjwegii.fsf@aiko.keithp.com > OUTPUT.$test_count
>  echo "another_tag" > EXPECTED
> -- 
> 1.7.10.4
>
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