diff options
Diffstat (limited to 'util/qemu-config.c')
| -rw-r--r-- | util/qemu-config.c | 215 |
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; + } +} |