[Qemu-devel] [PATCH] qemu-config: Accept empty option values

[Eduardo Habkost]

Currently it is impossible to set an option in a config file to an empty
string, because the parser matches only lines containing non-empty
strings between double-quotes.

As sscanf() "[" conversion specifier only matches non-empty strings, add
a special case for empty strings.

Signed-off-by: Eduardo Habkost <address@hidden>
---
 util/qemu-config.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/util/qemu-config.c b/util/qemu-config.c
index 2d32ce7..9f9577d 100644
--- a/util/qemu-config.c
+++ b/util/qemu-config.c
@@ -413,7 +413,8 @@ int qemu_config_parse(FILE *fp, QemuOptsList **lists, const 
char *fname)
             opts = qemu_opts_create(list, NULL, 0, &error_abort);
             continue;
         }
-        if (sscanf(line, " %63s = \"%1023[^\"]\"", arg, value) == 2) {
+        if (sscanf(line, " %63s = \"%1023[^\"]\"", arg, value) == 2 ||
+            (value[0] = '\0', sscanf(line, " %63s = \"\"", arg) == 1)) {
             /* arg = value */
             if (opts == NULL) {
                 error_report("no group defined");
-- 
2.1.0