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config: qemu_config_parse() return number of config groups 

Change qemu_config_parse() to return the number of config groups
in success and -EINVAL on error. This will allow callers of
qemu_config_parse() to check if something was really loaded from
the config file.

All existing callers of qemu_config_parse() and
qemu_read_config_file() only check if the return value was
negative, so the change shouldn't affect them.

Reviewed-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Message-Id: <20171004025043.3788-2-ehabkost@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
This commit is contained in:
Eduardo Habkost 2017-10-03 23:50:42 -03:00
parent 3478eae990
commit e5766d6ec7
2 changed files with 7 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
block/blkdebug.c
View File

@ -244,7 +244,6 @@ static int read_config(BDRVBlkdebugState *s, const char *filename,
ret = qemu_config_parse(f, config_groups, filename);
if (ret < 0) {
error_setg(errp, "Could not parse blkdebug config file");
ret = -EINVAL;
goto fail;
}
}

15
util/qemu-config.c
View File

@ -385,6 +385,7 @@ void qemu_config_write(FILE *fp)
}
}
/* Returns number of config groups on success, -errno on error */
int qemu_config_parse(FILE *fp, QemuOptsList **lists, const char *fname)
{
char line[1024], group[64], id[64], arg[64], value[1024];
@ -392,7 +393,8 @@ int qemu_config_parse(FILE *fp, QemuOptsList **lists, const char *fname)
QemuOptsList *list = NULL;
Error *local_err = NULL;
QemuOpts *opts = NULL;
int res = -1, lno = 0;
int res = -EINVAL, lno = 0;
int count = 0;
loc_push_none(&loc);
while (fgets(line, sizeof(line), fp) != NULL) {
@ -413,6 +415,7 @@ int qemu_config_parse(FILE *fp, QemuOptsList **lists, const char *fname)
goto out;
}
opts = qemu_opts_create(list, id, 1, NULL);
count++;
continue;
}
if (sscanf(line, "[%63[^]]]", group) == 1) {
@ -423,6 +426,7 @@ int qemu_config_parse(FILE *fp, QemuOptsList **lists, const char *fname)
goto out;
}
opts = qemu_opts_create(list, NULL, 0, &error_abort);
count++;
continue;
}
value[0] = '\0';
@ -447,7 +451,7 @@ int qemu_config_parse(FILE *fp, QemuOptsList **lists, const char *fname)
error_report("error reading file");
goto out;
}
res = 0;
res = count;
out:
loc_pop(&loc);
return res;
@ -464,12 +468,7 @@ int qemu_read_config_file(const char *filename)
ret = qemu_config_parse(f, vm_config_groups, filename);
fclose(f);
if (ret == 0) {
return 0;
} else {
return -EINVAL;
}
return ret;
}
static void config_parse_qdict_section(QDict *options, QemuOptsList *opts,