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-rw-r--r--util/qemu-config.c215
1 files changed, 215 insertions, 0 deletions
diff --git a/util/qemu-config.c b/util/qemu-config.c
new file mode 100644
index 0000000000..47c81f72d3
--- /dev/null
+++ b/util/qemu-config.c
@@ -0,0 +1,215 @@
+#include "qemu-common.h"
+#include "qemu/error-report.h"
+#include "qemu/option.h"
+#include "qemu/config-file.h"
+#include "hw/qdev.h"
+#include "qapi/error.h"
+
+static QemuOptsList *vm_config_groups[32];
+
+static QemuOptsList *find_list(QemuOptsList **lists, const char *group,
+ Error **errp)
+{
+ int i;
+
+ for (i = 0; lists[i] != NULL; i++) {
+ if (strcmp(lists[i]->name, group) == 0)
+ break;
+ }
+ if (lists[i] == NULL) {
+ error_set(errp, QERR_INVALID_OPTION_GROUP, group);
+ }
+ return lists[i];
+}
+
+QemuOptsList *qemu_find_opts(const char *group)
+{
+ QemuOptsList *ret;
+ Error *local_err = NULL;
+
+ ret = find_list(vm_config_groups, group, &local_err);
+ if (error_is_set(&local_err)) {
+ error_report("%s\n", error_get_pretty(local_err));
+ error_free(local_err);
+ }
+
+ return ret;
+}
+
+QemuOptsList *qemu_find_opts_err(const char *group, Error **errp)
+{
+ return find_list(vm_config_groups, group, errp);
+}
+
+void qemu_add_opts(QemuOptsList *list)
+{
+ int entries, i;
+
+ entries = ARRAY_SIZE(vm_config_groups);
+ entries--; /* keep list NULL terminated */
+ for (i = 0; i < entries; i++) {
+ if (vm_config_groups[i] == NULL) {
+ vm_config_groups[i] = list;
+ return;
+ }
+ }
+ fprintf(stderr, "ran out of space in vm_config_groups");
+ abort();
+}
+
+int qemu_set_option(const char *str)
+{
+ char group[64], id[64], arg[64];
+ QemuOptsList *list;
+ QemuOpts *opts;
+ int rc, offset;
+
+ rc = sscanf(str, "%63[^.].%63[^.].%63[^=]%n", group, id, arg, &offset);
+ if (rc < 3 || str[offset] != '=') {
+ error_report("can't parse: \"%s\"", str);
+ return -1;
+ }
+
+ list = qemu_find_opts(group);
+ if (list == NULL) {
+ return -1;
+ }
+
+ opts = qemu_opts_find(list, id);
+ if (!opts) {
+ error_report("there is no %s \"%s\" defined",
+ list->name, id);
+ return -1;
+ }
+
+ if (qemu_opt_set(opts, arg, str+offset+1) == -1) {
+ return -1;
+ }
+ return 0;
+}
+
+struct ConfigWriteData {
+ QemuOptsList *list;
+ FILE *fp;
+};
+
+static int config_write_opt(const char *name, const char *value, void *opaque)
+{
+ struct ConfigWriteData *data = opaque;
+
+ fprintf(data->fp, " %s = \"%s\"\n", name, value);
+ return 0;
+}
+
+static int config_write_opts(QemuOpts *opts, void *opaque)
+{
+ struct ConfigWriteData *data = opaque;
+ const char *id = qemu_opts_id(opts);
+
+ if (id) {
+ fprintf(data->fp, "[%s \"%s\"]\n", data->list->name, id);
+ } else {
+ fprintf(data->fp, "[%s]\n", data->list->name);
+ }
+ qemu_opt_foreach(opts, config_write_opt, data, 0);
+ fprintf(data->fp, "\n");
+ return 0;
+}
+
+void qemu_config_write(FILE *fp)
+{
+ struct ConfigWriteData data = { .fp = fp };
+ QemuOptsList **lists = vm_config_groups;
+ int i;
+
+ fprintf(fp, "# qemu config file\n\n");
+ for (i = 0; lists[i] != NULL; i++) {
+ data.list = lists[i];
+ qemu_opts_foreach(data.list, config_write_opts, &data, 0);
+ }
+}
+
+int qemu_config_parse(FILE *fp, QemuOptsList **lists, const char *fname)
+{
+ char line[1024], group[64], id[64], arg[64], value[1024];
+ Location loc;
+ QemuOptsList *list = NULL;
+ Error *local_err = NULL;
+ QemuOpts *opts = NULL;
+ int res = -1, lno = 0;
+
+ loc_push_none(&loc);
+ while (fgets(line, sizeof(line), fp) != NULL) {
+ loc_set_file(fname, ++lno);
+ if (line[0] == '\n') {
+ /* skip empty lines */
+ continue;
+ }
+ if (line[0] == '#') {
+ /* comment */
+ continue;
+ }
+ if (sscanf(line, "[%63s \"%63[^\"]\"]", group, id) == 2) {
+ /* group with id */
+ list = find_list(lists, group, &local_err);
+ if (error_is_set(&local_err)) {
+ error_report("%s\n", error_get_pretty(local_err));
+ error_free(local_err);
+ goto out;
+ }
+ opts = qemu_opts_create(list, id, 1, NULL);
+ continue;
+ }
+ if (sscanf(line, "[%63[^]]]", group) == 1) {
+ /* group without id */
+ list = find_list(lists, group, &local_err);
+ if (error_is_set(&local_err)) {
+ error_report("%s\n", error_get_pretty(local_err));
+ error_free(local_err);
+ goto out;
+ }
+ opts = qemu_opts_create_nofail(list);
+ continue;
+ }
+ if (sscanf(line, " %63s = \"%1023[^\"]\"", arg, value) == 2) {
+ /* arg = value */
+ if (opts == NULL) {
+ error_report("no group defined");
+ goto out;
+ }
+ if (qemu_opt_set(opts, arg, value) != 0) {
+ goto out;
+ }
+ continue;
+ }
+ error_report("parse error");
+ goto out;
+ }
+ if (ferror(fp)) {
+ error_report("error reading file");
+ goto out;
+ }
+ res = 0;
+out:
+ loc_pop(&loc);
+ return res;
+}
+
+int qemu_read_config_file(const char *filename)
+{
+ FILE *f = fopen(filename, "r");
+ int ret;
+
+ if (f == NULL) {
+ return -errno;
+ }
+
+ ret = qemu_config_parse(f, vm_config_groups, filename);
+ fclose(f);
+
+ if (ret == 0) {
+ return 0;
+ } else {
+ return -EINVAL;
+ }
+}