sources.py

# -*- coding: utf-8 -*-
#!/usr/bin/python -Es
#
# libocispec - a C library for parsing OCI spec files.
#
# Copyright (C) 2017, 2019 Giuseppe Scrivano <giuseppe@scrivano.org>
# Copyright (C) Huawei Technologies., Ltd. 2018-2019. All rights reserved.
#
# libocispec is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# libocispec is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with libocispec.  If not, see <http://www.gnu.org/licenses/>.
#
import helpers


def append_c_code(obj, c_file, prefix):
    """
    Description: append c language code to file
    Interface: None
    History: 2019-06-17
    """
    parse_json_to_c(obj, c_file, prefix)
    make_c_free(obj, c_file, prefix)
    get_c_json(obj, c_file, prefix)


def parse_map_string_obj(obj, c_file, prefix, obj_typename):
    """
    Description: generate c language for parse json map string object
    Interface: None
    History: 2019-06-17
    """
    child = obj.children[0]
    if helpers.valid_basic_map_name(child.typ):
        childname = helpers.make_basic_map_name(child.typ)
    else:
        if child.subtypname:
            childname = child.subtypname
        else:
            childname = helpers.get_prefixe_name(child.name, prefix)
    c_file.write('    if (YAJL_GET_OBJECT(tree) != NULL && YAJL_GET_OBJECT(tree)->len > 0) {\n')
    c_file.write('        size_t i;\n')
    c_file.write('        ret->len = YAJL_GET_OBJECT(tree)->len;\n')
    c_file.write('        ret->keys = safe_malloc((YAJL_GET_OBJECT(tree)->len + 1) ' \
                 '* sizeof(*ret->keys));\n')
    c_file.write('        ret->%s = safe_malloc((YAJL_GET_OBJECT(tree)->len + 1) ' \
                 '* sizeof(*ret->%s));\n' % (child.fixname, child.fixname))
    c_file.write('        for (i = 0; i < YAJL_GET_OBJECT(tree)->len; i++) {\n')
    c_file.write('            const char *tmpkey = YAJL_GET_OBJECT(tree)->keys[i];\n')
    c_file.write('            ret->keys[i] = safe_strdup(tmpkey ? tmpkey : "");\n')
    c_file.write('            yajl_val val = YAJL_GET_OBJECT(tree)->values[i];\n')
    c_file.write('            ret->%s[i] = make_%s(val, ctx, err);\n' \
                 % (child.fixname, childname))
    c_file.write('            if (ret->%s[i] == NULL) {\n' % (child.fixname))
    c_file.write("                free_%s(ret);\n" % obj_typename)
    c_file.write("                return NULL;\n")
    c_file.write('            }\n')
    c_file.write('        }\n')
    c_file.write('    }\n')


def parse_obj_type(obj, c_file, prefix, obj_typename):
    """
    Description: generate c language for parse object type
    Interface: None
    History: 2019-06-17
    """
    if obj.typ == 'string':
        c_file.write('    {\n')
        read_val_generator(c_file, 2, 'get_val(tree, "%s", yajl_t_string)' % obj.origname, \
                             "ret->%s" % obj.fixname, obj.typ, obj.origname, obj_typename)
        c_file.write('    }\n')
    elif helpers.judge_data_type(obj.typ):
        c_file.write('    {\n')
        read_val_generator(c_file, 2, 'get_val(tree, "%s", yajl_t_number)' % obj.origname, \
                             "ret->%s" % obj.fixname, obj.typ, obj.origname, obj_typename)
        c_file.write('    }\n')
    elif helpers.judge_data_pointer_type(obj.typ):
        c_file.write('    {\n')
        read_val_generator(c_file, 2, 'get_val(tree, "%s", yajl_t_number)' % obj.origname, \
                             "ret->%s" % obj.fixname, obj.typ, obj.origname, obj_typename)
        c_file.write('    }\n')
    if obj.typ == 'boolean':
        c_file.write('    {\n')
        read_val_generator(c_file, 2, 'get_val(tree, "%s", yajl_t_true)' % obj.origname, \
                             "ret->%s" % obj.fixname, obj.typ, obj.origname, obj_typename)
        c_file.write('    }\n')
    if obj.typ == 'booleanPointer':
        c_file.write('    {\n')
        read_val_generator(c_file, 2, 'get_val(tree, "%s", yajl_t_true)' % obj.origname, \
                             "ret->%s" % obj.fixname, obj.typ, obj.origname, obj_typename)
        c_file.write('    }\n')
    elif obj.typ == 'object' or obj.typ == 'mapStringObject':
        if obj.subtypname is not None:
            typename = obj.subtypname
        else:
            typename = helpers.get_prefixe_name(obj.name, prefix)
        c_file.write(
            '    ret->%s = make_%s(get_val(tree, "%s", yajl_t_object), ctx, err);\n' \
            % (obj.fixname, typename, obj.origname))
        c_file.write("    if (ret->%s == NULL && *err != 0) {\n" % obj.fixname)
        c_file.write("        free_%s(ret);\n" % obj_typename)
        c_file.write("        return NULL;\n")
        c_file.write("    }\n")
    elif obj.typ == 'array' and (obj.subtypobj or obj.subtyp == 'object'):
        if obj.subtypname:
            typename = obj.subtypname
        else:
            typename = helpers.get_name_substr(obj.name, prefix)
        c_file.write('    {\n')
        c_file.write('        yajl_val tmp = get_val(tree, "%s", yajl_t_array);\n' \
                     % (obj.origname))
        c_file.write('        if (tmp != NULL && YAJL_GET_ARRAY(tmp) != NULL &&' \
                     ' YAJL_GET_ARRAY(tmp)->len > 0) {\n')
        c_file.write('            size_t i;\n')
        c_file.write('            ret->%s_len = YAJL_GET_ARRAY(tmp)->len;\n' % (obj.fixname))
        c_file.write('            ret->%s = safe_malloc((YAJL_GET_ARRAY(tmp)->len + 1) ' \
                     '* sizeof(*ret->%s));\n' % (obj.fixname, obj.fixname))
        c_file.write('            for (i = 0; i < YAJL_GET_ARRAY(tmp)->len; i++) {\n')
        c_file.write('                yajl_val val = YAJL_GET_ARRAY(tmp)->values[i];\n')
        c_file.write('                ret->%s[i] = make_%s(val, ctx, err);\n' \
                     % (obj.fixname, typename))
        c_file.write('                if (ret->%s[i] == NULL) {\n' % (obj.fixname))
        c_file.write("                    free_%s(ret);\n" % obj_typename)
        c_file.write("                    return NULL;\n")
        c_file.write('                }\n')
        c_file.write('            }\n')
        c_file.write('        }\n')
        c_file.write('    }\n')
    elif obj.typ == 'array' and obj.subtyp == 'byte':
        c_file.write('    {\n')
        c_file.write('        yajl_val tmp = get_val(tree, "%s", yajl_t_string);\n' \
                     % (obj.origname))
        c_file.write('        if (tmp != NULL) {\n')
        c_file.write('            char *str = YAJL_GET_STRING(tmp);\n')
        c_file.write('            ret->%s = (uint8_t *)safe_strdup(str ? str : "");\n' \
                     % obj.fixname)
        c_file.write('            ret->%s_len = str != NULL ? strlen(str) : 0;\n' \
                     % obj.fixname)
        c_file.write('        }\n')
        c_file.write('    }\n')
    elif obj.typ == 'array':
        c_file.write('    {\n')
        c_file.write('        yajl_val tmp = get_val(tree, "%s", yajl_t_array);\n' \
                     % (obj.origname))
        c_file.write('        if (tmp != NULL && YAJL_GET_ARRAY(tmp) != NULL &&'  \
                     ' YAJL_GET_ARRAY(tmp)->len > 0) {\n')
        c_file.write('            size_t i;\n')
        c_file.write('            ret->%s_len = YAJL_GET_ARRAY(tmp)->len;\n' % (obj.fixname))
        c_file.write(
            '            ret->%s = safe_malloc((YAJL_GET_ARRAY(tmp)->len + 1) *' \
            ' sizeof(*ret->%s));\n' % (obj.fixname, obj.fixname))
        c_file.write('            for (i = 0; i < YAJL_GET_ARRAY(tmp)->len; i++) {\n')
        read_val_generator(c_file, 4, 'YAJL_GET_ARRAY(tmp)->values[i]', \
                             "ret->%s[i]" % obj.fixname, obj.subtyp, obj.origname, obj_typename)
        c_file.write('            }\n')
        c_file.write('        }\n')
        c_file.write('    }\n')
    elif helpers.valid_basic_map_name(obj.typ):
        c_file.write('    {\n')
        c_file.write('        yajl_val tmp = get_val(tree, "%s", yajl_t_object);\n' \
                     % (obj.origname))
        c_file.write('        if (tmp != NULL) {\n')
        c_file.write('            ret->%s = make_%s(tmp, ctx, err);\n' \
                     % (obj.fixname, helpers.make_basic_map_name(obj.typ)))
        c_file.write('            if (ret->%s == NULL) {\n' % (obj.fixname))
        c_file.write('                char *new_error = NULL;\n')
        c_file.write("                if (asprintf(&new_error, \"Value error for key" \
                     " '%s': %%s\", *err ? *err : \"null\") < 0) {\n" % (obj.origname))
        c_file.write('                    new_error = safe_strdup(' \
                     '"error allocating memory");\n')
        c_file.write('                }\n')
        c_file.write('                free(*err);\n')
        c_file.write('                *err = new_error;\n')
        c_file.write('                free_%s(ret);\n' % obj_typename)
        c_file.write('                return NULL;\n')
        c_file.write('            }\n')
        c_file.write('        }\n')
        c_file.write('    }\n')

def parse_obj_arr_obj(obj, c_file, prefix, obj_typename):
    """
    Description: generate c language for parse object or array object
    Interface: None
    History: 2019-06-17
    """
    nodes = obj.children if obj.typ == 'object' else obj.subtypobj
    required_to_check = []
    for i in nodes or []:
        if obj.required and i.origname in obj.required and \
                not helpers.judge_data_type(i.typ) and i.typ != 'boolean':
            required_to_check.append(i)
        parse_obj_type(i, c_file, prefix, obj_typename)

    for i in required_to_check:
        c_file.write('    if (ret->%s == NULL) {\n' % i.fixname)
        c_file.write('        if (asprintf(err, "Required field \'%%s\' not present", ' \
                     ' "%s") < 0)\n' % i.origname)
        c_file.write('            *err = safe_strdup("error allocating memory");\n')
        c_file.write("        free_%s(ret);\n" % obj_typename)
        c_file.write("        return NULL;\n")
        c_file.write('    }\n')

    if obj.typ == 'object' and obj.children is not None:
        # O(n^2) complexity, but the objects should not really be big...
        condition = " &&\n                ".join( \
            ['strcmp(tree->u.object.keys[i], "%s")' % i.origname for i in obj.children])
        c_file.write("""
    if (tree->type == yajl_t_object && (ctx->options & OPT_PARSE_STRICT)) {
        size_t i;
        for (i = 0; i < tree->u.object.len; i++)
            if (%s) {
                if (ctx->stderr > 0)
                    (void)fprintf(ctx->stderr, "WARNING: unknown key found: %%s\\n",
                            tree->u.object.keys[i]);
            }
        }
""" % condition)


def parse_json_to_c(obj, c_file, prefix):
    """
    Description: generate c language for parse json file
    Interface: None
    History: 2019-06-17
    """
    if not helpers.judge_complex(obj.typ):
        return
    if obj.typ == 'object' or obj.typ == 'mapStringObject':
        if obj.subtypname:
            return
        obj_typename = typename = helpers.get_prefixe_name(obj.name, prefix)
    if obj.typ == 'array':
        obj_typename = typename = helpers.get_name_substr(obj.name, prefix)
        objs = obj.subtypobj
        if objs is None or obj.subtypname:
            return
    c_file.write("%s *make_%s(yajl_val tree, const struct parser_context *ctx, "\
        "parser_error *err) {\n" % (typename, typename))
    c_file.write("    %s *ret = NULL;\n" % (typename))
    c_file.write("    *err = 0;\n")
    c_file.write("    if (tree == NULL)\n")
    c_file.write("        return ret;\n")
    c_file.write("    ret = safe_malloc(sizeof(*ret));\n")
    if obj.typ == 'mapStringObject':
        parse_map_string_obj(obj, c_file, prefix, obj_typename)

    if obj.typ == 'object' or (obj.typ == 'array' and obj.subtypobj):
        parse_obj_arr_obj(obj, c_file, prefix, obj_typename)
    c_file.write('    return ret;\n')
    c_file.write("}\n\n")


def get_map_string_obj(obj, c_file, prefix):
    """
    Description: c language generate map string object
    Interface: None
    History: 2019-06-17
    """
    child = obj.children[0]
    if helpers.valid_basic_map_name(child.typ):
        childname = helpers.make_basic_map_name(child.typ)
    else:
        if child.subtypname:
            childname = child.subtypname
        else:
            childname = helpers.get_prefixe_name(child.name, prefix)
    c_file.write('    size_t len = 0, i;\n')
    c_file.write("    if (ptr != NULL)\n")
    c_file.write("        len = ptr->len;\n")
    c_file.write("    if (!len && !(ctx->options & OPT_GEN_SIMPLIFY))\n")
    c_file.write('        yajl_gen_config(g, yajl_gen_beautify, 0);\n')
    c_file.write("    stat = yajl_gen_map_open((yajl_gen)g);\n")
    c_file.write("    if (yajl_gen_status_ok != stat)\n")
    c_file.write("        GEN_SET_ERROR_AND_RETURN(stat, err);\n")
    c_file.write('    if (len ||(ptr != NULL && ptr->keys != NULL && ptr->%s != NULL)) {\n' \
                 % child.fixname)
    c_file.write('        for (i = 0; i < len; i++) {\n')
    c_file.write('            char *str = ptr->keys[i] ? ptr->keys[i] : "";\n')
    c_file.write('            stat = yajl_gen_string((yajl_gen)g, \
        (const unsigned char *)str, strlen(str));\n')
    c_file.write("            if (yajl_gen_status_ok != stat)\n")
    c_file.write("                GEN_SET_ERROR_AND_RETURN(stat, err);\n")
    c_file.write('            stat = gen_%s(g, ptr->%s[i], ctx, err);\n' \
                 % (childname, child.fixname))
    c_file.write("            if (yajl_gen_status_ok != stat)\n")
    c_file.write("                GEN_SET_ERROR_AND_RETURN(stat, err);\n")
    c_file.write('        }\n')
    c_file.write('    }\n')
    c_file.write("    stat = yajl_gen_map_close((yajl_gen)g);\n")
    c_file.write("    if (yajl_gen_status_ok != stat)\n")
    c_file.write("        GEN_SET_ERROR_AND_RETURN(stat, err);\n")
    c_file.write("    if (!len && !(ctx->options & OPT_GEN_SIMPLIFY))\n")
    c_file.write('        yajl_gen_config(g, yajl_gen_beautify, 1);\n')


def get_obj_arr_obj(obj, c_file, prefix):
    """
    Description: c language generate object or array object
    Interface: None
    History: 2019-06-17
    """
    if obj.typ == 'string':
        c_file.write('    if ((ctx->options & OPT_GEN_KAY_VALUE) ||' \
                     ' (ptr != NULL && ptr->%s != NULL)) {\n' % obj.fixname)
        c_file.write('        char *str = "";\n')
        c_file.write('        stat = yajl_gen_string((yajl_gen)g, \
            (const unsigned char *)("%s"), strlen("%s"));\n' % (obj.origname, obj.origname))
        c_file.write("        if (yajl_gen_status_ok != stat)\n")
        c_file.write("            GEN_SET_ERROR_AND_RETURN(stat, err);\n")
        c_file.write("        if (ptr != NULL && ptr->%s != NULL) {\n" % obj.fixname)
        c_file.write("            str = ptr->%s;\n" % obj.fixname)
        c_file.write("        }\n")
        json_value_generator(c_file, 2, "str", 'g', 'ctx', obj.typ)
        c_file.write("    }\n")
    elif helpers.judge_data_type(obj.typ):
        c_file.write('    if ((ctx->options & OPT_GEN_KAY_VALUE) ||' \
                     ' (ptr != NULL && ptr->%s)) {\n' % obj.fixname)
        if obj.typ == 'double':
            numtyp = 'double'
        elif obj.typ.startswith("uint") or obj.typ == 'GID' or obj.typ == 'UID':
            numtyp = 'long long unsigned int'
        else:
            numtyp = 'long long int'
        c_file.write('        %s num = 0;\n' % numtyp)
        c_file.write('        stat = yajl_gen_string((yajl_gen)g, \
            (const unsigned char *)("%s"), strlen("%s"));\n' % (obj.origname, obj.origname))
        c_file.write("        if (yajl_gen_status_ok != stat)\n")
        c_file.write("            GEN_SET_ERROR_AND_RETURN(stat, err);\n")
        c_file.write("        if (ptr != NULL && ptr->%s) {\n" % obj.fixname)
        c_file.write("            num = (%s)ptr->%s;\n" % (numtyp, obj.fixname))
        c_file.write("        }\n")
        json_value_generator(c_file, 2, "num", 'g', 'ctx', obj.typ)
        c_file.write("    }\n")
    elif helpers.judge_data_pointer_type(obj.typ):
        c_file.write('    if ((ptr != NULL && ptr->%s != NULL)) {\n' % obj.fixname)
        numtyp = helpers.obtain_data_pointer_type(obj.typ)
        if numtyp == "":
            return
        c_file.write('        %s num = 0;\n' % helpers.get_map_c_types(numtyp))
        c_file.write('        stat = yajl_gen_string((yajl_gen)g, \
            (const unsigned char *)("%s"), strlen("%s"));\n' % (obj.origname, obj.origname))
        c_file.write("        if (yajl_gen_status_ok != stat)\n")
        c_file.write("            GEN_SET_ERROR_AND_RETURN(stat, err);\n")
        c_file.write("        if (ptr != NULL && ptr->%s != NULL) {\n" % obj.fixname)
        c_file.write("            num = (%s)*(ptr->%s);\n" \
                     % (helpers.get_map_c_types(numtyp), obj.fixname))
        c_file.write("        }\n")
        json_value_generator(c_file, 2, "num", 'g', 'ctx', numtyp)
        c_file.write("    }\n")
    elif obj.typ == 'boolean':
        c_file.write('    if ((ctx->options & OPT_GEN_KAY_VALUE) ||' \
                     ' (ptr != NULL && ptr->%s)) {\n' % obj.fixname)
        c_file.write('        bool b = false;\n')
        c_file.write('        stat = yajl_gen_string((yajl_gen)g, \
            (const unsigned char *)("%s"), strlen("%s"));\n' % (obj.origname, obj.origname))
        c_file.write("        if (yajl_gen_status_ok != stat)\n")
        c_file.write("            GEN_SET_ERROR_AND_RETURN(stat, err);\n")
        c_file.write("        if (ptr != NULL && ptr->%s) {\n" % obj.fixname)
        c_file.write("            b = ptr->%s;\n" % obj.fixname)
        c_file.write("        }\n")
        json_value_generator(c_file, 2, "b", 'g', 'ctx', obj.typ)
        c_file.write("    }\n")
    elif obj.typ == 'object' or obj.typ == 'mapStringObject':
        if obj.subtypname:
            typename = obj.subtypname
        else:
            typename = helpers.get_prefixe_name(obj.name, prefix)
        c_file.write('    if ((ctx->options & OPT_GEN_KAY_VALUE) ||' \
                     ' (ptr != NULL && ptr->%s != NULL)) {\n' % obj.fixname)
        c_file.write('        stat = yajl_gen_string((yajl_gen)g, \
            (const unsigned char *)("%s"), strlen("%s"));\n' % (obj.origname, obj.origname))
        c_file.write("        if (yajl_gen_status_ok != stat)\n")
        c_file.write("            GEN_SET_ERROR_AND_RETURN(stat, err);\n")
        c_file.write('        stat = gen_%s(g, ptr != NULL ? ptr->%s : NULL, ctx, err);\n' \
                     % (typename, obj.fixname))
        c_file.write("        if (yajl_gen_status_ok != stat)\n")
        c_file.write("            GEN_SET_ERROR_AND_RETURN(stat, err);\n")
        c_file.write("    }\n")
    elif obj.typ == 'array' and (obj.subtypobj or obj.subtyp == 'object'):
        if obj.subtypname:
            typename = obj.subtypname
        else:
            typename = helpers.get_name_substr(obj.name, prefix)
        c_file.write('    if ((ctx->options & OPT_GEN_KAY_VALUE) || ' \
                     '(ptr != NULL && ptr->%s != NULL)) {\n' % obj.fixname)
        c_file.write('        size_t len = 0, i;\n')
        c_file.write('        stat = yajl_gen_string((yajl_gen)g, \
            (const unsigned char *)("%s"), strlen("%s"));\n' % (obj.origname, obj.origname))
        c_file.write("        if (yajl_gen_status_ok != stat)\n")
        c_file.write("            GEN_SET_ERROR_AND_RETURN(stat, err);\n")
        c_file.write("        if (ptr != NULL && ptr->%s != NULL) {\n" % obj.fixname)
        c_file.write("            len = ptr->%s_len;\n" % obj.fixname)
        c_file.write("        }\n")
        c_file.write("        if (!len && !(ctx->options & OPT_GEN_SIMPLIFY))\n")
        c_file.write('            yajl_gen_config(g, yajl_gen_beautify, 0);\n')
        c_file.write('        stat = yajl_gen_array_open((yajl_gen)g);\n')
        c_file.write("        if (yajl_gen_status_ok != stat)\n")
        c_file.write("            GEN_SET_ERROR_AND_RETURN(stat, err);\n")
        c_file.write('        for (i = 0; i < len; i++) {\n')
        c_file.write('            stat = gen_%s(g, ptr->%s[i], ctx, err);\n' \
                     % (typename, obj.fixname))
        c_file.write("            if (yajl_gen_status_ok != stat)\n")
        c_file.write("                GEN_SET_ERROR_AND_RETURN(stat, err);\n")
        c_file.write('        }\n')
        c_file.write('        stat = yajl_gen_array_close((yajl_gen)g);\n')
        c_file.write("        if (!len && !(ctx->options & OPT_GEN_SIMPLIFY))\n")
        c_file.write('            yajl_gen_config(g, yajl_gen_beautify, 1);\n')
        c_file.write("        if (yajl_gen_status_ok != stat)\n")
        c_file.write("            GEN_SET_ERROR_AND_RETURN(stat, err);\n")
        c_file.write('    }\n')
    elif obj.typ == 'array' and obj.subtyp == 'byte':
        c_file.write('    if ((ctx->options & OPT_GEN_KAY_VALUE) ||' \
                     ' (ptr != NULL && ptr->%s != NULL && ptr->%s_len)) {\n' \
                     % (obj.fixname, obj.fixname))
        c_file.write('        const char *str = "";\n')
        c_file.write('        size_t len = 0;\n')
        c_file.write('        stat = yajl_gen_string((yajl_gen)g, \
        (const unsigned char *)("%s"), strlen("%s"));\n' % (obj.origname, obj.origname))
        c_file.write("        if (yajl_gen_status_ok != stat)\n")
        c_file.write("            GEN_SET_ERROR_AND_RETURN(stat, err);\n")
        c_file.write("        if (ptr != NULL && ptr->%s != NULL) {\n" % obj.fixname)
        c_file.write("            str = (const char *)ptr->%s;\n" % obj.fixname)
        c_file.write("            len = ptr->%s_len;\n" % obj.fixname)
        c_file.write("        }\n")
        c_file.write('        stat = yajl_gen_string((yajl_gen)g, \
        (const unsigned char *)str, len);\n')
        c_file.write("        if (yajl_gen_status_ok != stat)\n")
        c_file.write("            GEN_SET_ERROR_AND_RETURN(stat, err);\n")
        c_file.write("    }\n")
    elif obj.typ == 'array':
        c_file.write('    if ((ctx->options & OPT_GEN_KAY_VALUE) || ' \
                     '(ptr != NULL && ptr->%s != NULL)) {\n' % obj.fixname)
        c_file.write('        size_t len = 0, i;\n')
        c_file.write('        stat = yajl_gen_string((yajl_gen)g, \
            (const unsigned char *)("%s"), strlen("%s"));\n' % (obj.origname, obj.origname))
        c_file.write("        if (yajl_gen_status_ok != stat)\n")
        c_file.write("            GEN_SET_ERROR_AND_RETURN(stat, err);\n")
        c_file.write("        if (ptr != NULL && ptr->%s != NULL) {\n" % obj.fixname)
        c_file.write("            len = ptr->%s_len;\n" % obj.fixname)
        c_file.write("        }\n")
        c_file.write("        if (!len && !(ctx->options & OPT_GEN_SIMPLIFY))\n")
        c_file.write('            yajl_gen_config(g, yajl_gen_beautify, 0);\n')
        c_file.write('        stat = yajl_gen_array_open((yajl_gen)g);\n')
        c_file.write("        if (yajl_gen_status_ok != stat)\n")
        c_file.write("            GEN_SET_ERROR_AND_RETURN(stat, err);\n")
        c_file.write('        for (i = 0; i < len; i++) {\n')
        json_value_generator(c_file, 3, "ptr->%s[i]" % obj.fixname, 'g', 'ctx', obj.subtyp)
        c_file.write('        }\n')
        c_file.write('        stat = yajl_gen_array_close((yajl_gen)g);\n')
        c_file.write("        if (yajl_gen_status_ok != stat)\n")
        c_file.write("            GEN_SET_ERROR_AND_RETURN(stat, err);\n")
        c_file.write("        if (!len && !(ctx->options & OPT_GEN_SIMPLIFY))\n")
        c_file.write('            yajl_gen_config(g, yajl_gen_beautify, 1);\n')
        c_file.write('    }\n')
    elif helpers.valid_basic_map_name(obj.typ):
        c_file.write('    if ((ctx->options & OPT_GEN_KAY_VALUE) || ' \
                     '(ptr != NULL && ptr->%s != NULL)) {\n' % obj.fixname)
        c_file.write('        stat = yajl_gen_string((yajl_gen)g, \
        (const unsigned char *)("%s"), strlen("%s"));\n' % (obj.origname, obj.origname))
        c_file.write("        if (yajl_gen_status_ok != stat)\n")
        c_file.write("            GEN_SET_ERROR_AND_RETURN(stat, err);\n")
        c_file.write('        stat = gen_%s(g, ptr ? ptr->%s : NULL, ctx, err);\n' \
                     % (helpers.make_basic_map_name(obj.typ), obj.fixname))
        c_file.write("        if (yajl_gen_status_ok != stat)\n")
        c_file.write("            GEN_SET_ERROR_AND_RETURN(stat, err);\n")
        c_file.write("    }\n")


def get_c_json(obj, c_file, prefix):
    """
    Description: c language generate json file
    Interface: None
    History: 2019-06-17
    """
    if not helpers.judge_complex(obj.typ) or obj.subtypname:
        return
    if obj.typ == 'object' or obj.typ == 'mapStringObject':
        typename = helpers.get_prefixe_name(obj.name, prefix)
    elif obj.typ == 'array':
        typename = helpers.get_name_substr(obj.name, prefix)
        objs = obj.subtypobj
        if objs is None:
            return
    c_file.write(
        "yajl_gen_status gen_%s(yajl_gen g, const %s *ptr, const struct parser_context " \
        "*ctx, parser_error *err) {\n" % (typename, typename))
    c_file.write("    yajl_gen_status stat = yajl_gen_status_ok;\n")
    c_file.write("    *err = 0;\n")
    if obj.typ == 'mapStringObject':
        get_map_string_obj(obj, c_file, prefix)
    elif obj.typ == 'object' or (obj.typ == 'array' and obj.subtypobj):
        nodes = obj.children if obj.typ == 'object' else obj.subtypobj
        if nodes is None:
            c_file.write('    if (!(ctx->options & OPT_GEN_SIMPLIFY))\n')
            c_file.write('        yajl_gen_config(g, yajl_gen_beautify, 0);\n')

        c_file.write("    stat = yajl_gen_map_open((yajl_gen)g);\n")
        c_file.write("    if (yajl_gen_status_ok != stat)\n")
        c_file.write("        GEN_SET_ERROR_AND_RETURN(stat, err);\n")
        for i in nodes or []:
            get_obj_arr_obj(i, c_file, prefix)
        c_file.write("    stat = yajl_gen_map_close((yajl_gen)g);\n")
        c_file.write("    if (yajl_gen_status_ok != stat)\n")
        c_file.write("        GEN_SET_ERROR_AND_RETURN(stat, err);\n")
        if nodes is None:
            c_file.write('    if (!(ctx->options & OPT_GEN_SIMPLIFY))\n')
            c_file.write('        yajl_gen_config(g, yajl_gen_beautify, 1);\n')
    c_file.write('    return yajl_gen_status_ok;\n')
    c_file.write("}\n\n")


def read_val_generator(c_file, level, src, dest, typ, keyname, obj_typename):
    """
    Description: read value generateor
    Interface: None
    History: 2019-06-17
    """
    if helpers.valid_basic_map_name(typ):
        c_file.write('%syajl_val val = %s;\n' % ('    ' * level, src))
        c_file.write('%sif (val != NULL) {\n' % ('    ' * level))
        c_file.write('%s%s = make_%s(val, ctx, err);\n' \
                     % ('    ' * (level + 1), dest, helpers.make_basic_map_name(typ)))
        c_file.write('%sif (%s == NULL) {\n' % ('    ' * (level + 1), dest))
        c_file.write('%s    char *new_error = NULL;\n' % ('    ' * (level + 1)))
        c_file.write("%s    if (asprintf(&new_error, \"Value error for key" \
                     " '%s': %%s\", *err ? *err : \"null\") < 0) {\n" \
                     % ('    ' * (level + 1), keyname))
        c_file.write('%s        new_error = safe_strdup("error allocating memory");\n' \
                     % ('    ' * (level + 1)))
        c_file.write('%s    }\n' % ('    ' * (level + 1)))
        c_file.write('%s    free(*err);\n' % ('    ' * (level + 1)))
        c_file.write('%s    *err = new_error;\n' % ('    ' * (level + 1)))
        c_file.write('%s    free_%s(ret);\n' % ('    ' * (level + 1), obj_typename))
        c_file.write('%s    return NULL;\n' % ('    ' * (level + 1)))
        c_file.write('%s}\n' % ('    ' * (level + 1)))
        c_file.write('%s}\n' % ('    ' * (level)))
    elif typ == 'string':
        c_file.write('%syajl_val val = %s;\n' % ('    ' * (level), src))
        c_file.write('%sif (val != NULL) {\n' % ('    ' * (level)))
        c_file.write('%schar *str = YAJL_GET_STRING(val);\n' % ('    ' * (level + 1)))
        c_file.write('%s%s = safe_strdup(str ? str : "");\n' % ('    ' * (level + 1), dest))
        c_file.write('%s}\n' % ('    ' * level))
    elif helpers.judge_data_type(typ):
        c_file.write('%syajl_val val = %s;\n' % ('    ' * (level), src))
        c_file.write('%sif (val != NULL) {\n' % ('    ' * (level)))
        if typ.startswith("uint") or \
                (typ.startswith("int") and typ != "integer") or typ == "double":
            c_file.write('%sint invalid = common_safe_%s(YAJL_GET_NUMBER(val), &%s);\n' \
                         % ('    ' * (level + 1), typ, dest))
        elif typ == "integer":
            c_file.write('%sint invalid = common_safe_int(YAJL_GET_NUMBER(val), (int *)&%s);\n' \
                         % ('    ' * (level + 1), dest))
        elif typ == "UID" or typ == "GID":
            c_file.write('%sint invalid = common_safe_uint(YAJL_GET_NUMBER(val),' \
                         ' (unsigned int *)&%s);\n' % ('    ' * (level + 1), dest))
        c_file.write('%sif (invalid) {\n' % ('    ' * (level + 1)))
        c_file.write('%s    if (asprintf(err, "Invalid value \'%%s\' with type \'%s\' '
                     'for key \'%s\': %%s", YAJL_GET_NUMBER(val), strerror(-invalid)) < 0)\n' \
                     % ('    ' * (level + 1), typ, keyname))
        c_file.write('%s        *err = safe_strdup("error allocating memory");\n' \
                     % ('    ' * (level + 1)))
        c_file.write('%s    free_%s(ret);\n' % ('    ' * (level + 1), obj_typename))
        c_file.write('%s    return NULL;\n' % ('    ' * (level + 1)))
        c_file.write('%s}\n' % ('    ' * (level + 1)))
        c_file.write('%s}\n' % ('    ' * (level)))
    elif helpers.judge_data_pointer_type(typ):
        num_type = helpers.obtain_data_pointer_type(typ)
        if num_type == "":
            return
        c_file.write('%syajl_val val = %s;\n' % ('    ' * (level), src))
        c_file.write('%sif (val != NULL) {\n' % ('    ' * (level)))
        c_file.write('%s%s = safe_malloc(sizeof(%s));\n' %
                     ('    ' * (level + 1), dest, helpers.get_map_c_types(num_type)))
        c_file.write('%sint invalid = common_safe_%s(YAJL_GET_NUMBER(val), %s);\n' \
                     % ('    ' * (level + 1), num_type, dest))
        c_file.write('%sif (invalid) {\n' % ('    ' * (level + 1)))
        c_file.write('%s    if (asprintf(err, "Invalid value \'%%s\' with type \'%s\' ' \
                     'for key \'%s\': %%s", YAJL_GET_NUMBER(val), strerror(-invalid)) < 0)\n' \
                     % ('    ' * (level + 1), typ, keyname))
        c_file.write('%s        *err = safe_strdup("error allocating memory");\n' \
                     % ('    ' * (level + 1)))
        c_file.write('%s    free_%s(ret);\n' % ('    ' * (level + 1), obj_typename))
        c_file.write('%s    return NULL;\n' % ('    ' * (level + 1)))
        c_file.write('%s}\n' % ('    ' * (level + 1)))
        c_file.write('%s}\n' % ('    ' * (level)))
    elif typ == 'boolean':
        c_file.write('%syajl_val val = %s;\n' % ('    ' * (level), src))
        c_file.write('%sif (val != NULL)\n' % ('    ' * (level)))
        c_file.write('%s%s = YAJL_IS_TRUE(val);\n' % ('    ' * (level + 1), dest))
    elif typ == 'booleanPointer':
        c_file.write('%syajl_val val = %s;\n' % ('    ' * (level), src))
        c_file.write('%sif (val != NULL) {\n' % ('    ' * (level)))
        c_file.write('%s%s = safe_malloc(sizeof(bool));\n' % ('    ' * (level + 1), dest))
        c_file.write('%s*(%s) = YAJL_IS_TRUE(val);\n' % ('    ' * (level + 1), dest))
        c_file.write('%s} else {\n' % ('    ' * (level)))
        c_file.write('%sval = get_val(tree, "%s", yajl_t_false);\n' \
                     % ('    ' * (level + 1), keyname))
        c_file.write('%sif (val != NULL) {\n' % ('    ' * (level + 1)))
        c_file.write('%s%s = safe_malloc(sizeof(bool));\n' % ('    ' * (level + 2), dest))
        c_file.write('%s*(%s) = YAJL_IS_TRUE(val);\n' % ('    ' * (level + 2), dest))
        c_file.write('%s}\n' % ('    ' * (level + 1)))
        c_file.write('%s}\n' % ('    ' * (level)))


def json_value_generator(c_file, level, src, dst, ptx, typ):
    """
    Description: json value generateor
    Interface: None
    History: 2019-06-17
    """
    if helpers.valid_basic_map_name(typ):
        c_file.write('%sstat = gen_%s(%s, %s, %s, err);\n' \
                     % ('    ' * (level), helpers.make_basic_map_name(typ), dst, src, ptx))
        c_file.write("%sif (yajl_gen_status_ok != stat)\n" % ('    ' * (level)))
        c_file.write("%sGEN_SET_ERROR_AND_RETURN(stat, err);\n" % ('    ' * (level + 1)))
    elif typ == 'string':
        c_file.write('%sstat = yajl_gen_string((yajl_gen)%s, \
        (const unsigned char *)(%s), strlen(%s));\n' % ('    ' * (level), dst, src, src))
        c_file.write("%sif (yajl_gen_status_ok != stat)\n" % ('    ' * (level)))
        c_file.write("%sGEN_SET_ERROR_AND_RETURN(stat, err);\n" % ('    ' * (level + 1)))
    elif helpers.judge_data_type(typ):
        if typ == 'double':
            c_file.write('%sstat = yajl_gen_double((yajl_gen)%s, %s);\n' \
                         % ('    ' * (level), dst, src))
        elif typ.startswith("uint") or typ == 'GID' or typ == 'UID':
            c_file.write('%sstat = map_uint(%s, %s);\n' % ('    ' * (level), dst, src))
        else:
            c_file.write('%sstat = map_int(%s, %s);\n' % ('    ' * (level), dst, src))
        c_file.write("%sif (yajl_gen_status_ok != stat)\n" % ('    ' * (level)))
        c_file.write("%sGEN_SET_ERROR_AND_RETURN(stat, err);\n" \
                     % ('    ' * (level + 1)))
    elif typ == 'boolean':
        c_file.write('%sstat = yajl_gen_bool((yajl_gen)%s, (int)(%s));\n' \
                     % ('    ' * (level), dst, src))
        c_file.write("%sif (yajl_gen_status_ok != stat)\n" % ('    ' * (level)))
        c_file.write("%sGEN_SET_ERROR_AND_RETURN(stat, err);\n" % ('    ' * (level + 1)))


def make_c_free(obj, c_file, prefix):
    """
    Description: generate c free function
    Interface: None
    History: 2019-06-17
    """
    if not helpers.judge_complex(obj.typ) or obj.subtypname:
        return
    typename = helpers.get_prefixe_name(obj.name, prefix)
    case = obj.typ
    result = {'mapStringObject': lambda x: [], 'object': lambda x: x.children,
              'array': lambda x: x.subtypobj}[case](obj)
    objs = result
    if obj.typ == 'array':
        if objs is None:
            return
        else:
            typename = helpers.get_name_substr(obj.name, prefix)
    c_file.write("void free_%s(%s *ptr) {\n" % (typename, typename))
    c_file.write("    if (ptr == NULL)\n")
    c_file.write("        return;\n")
    if obj.typ == 'mapStringObject':
        child = obj.children[0]
        if helpers.valid_basic_map_name(child.typ):
            childname = helpers.make_basic_map_name(child.typ)
        else:
            if child.subtypname:
                childname = child.subtypname
            else:
                childname = helpers.get_prefixe_name(child.name, prefix)
        c_file_map_str(c_file, child, childname)
    for i in objs or []:
        if helpers.valid_basic_map_name(i.typ):
            free_func = helpers.make_basic_map_name(i.typ)
            c_file.write("    free_%s(ptr->%s);\n" % (free_func, i.fixname))
            c_file.write("    ptr->%s = NULL;\n" % (i.fixname))
        if i.typ == 'mapStringObject':
            if i.subtypname:
                free_func = i.subtypname
            else:
                free_func = helpers.get_prefixe_name(i.name, prefix)
            c_file.write("    free_%s(ptr->%s);\n" % (free_func, i.fixname))
            c_file.write("    ptr->%s = NULL;\n" % (i.fixname))
        elif i.typ == 'array':
            if helpers.valid_basic_map_name(i.subtyp):
                free_func = helpers.make_basic_map_name(i.subtyp)
                c_file.write("    if (ptr->%s != NULL) {\n" % i.fixname)
                c_file.write("        size_t i;\n")
                c_file.write("        for (i = 0; i < ptr->%s_len; i++) {\n" % i.fixname)
                c_file.write("            if (ptr->%s[i] != NULL) {\n" % (i.fixname))
                c_file.write("                free_%s(ptr->%s[i]);\n" % (free_func, i.fixname))
                c_file.write("                ptr->%s[i] = NULL;\n" % (i.fixname))
                c_file.write("            }\n")
                c_file.write("        }\n")
                c_file.write("        free(ptr->%s);\n" % (i.fixname))
                c_file.write("        ptr->%s = NULL;\n" % (i.fixname))
                c_file.write("    }\n")
            elif i.subtyp == 'string':
                c_file_str(c_file, i)
            elif not helpers.judge_complex(i.subtyp):
                c_file.write("    free(ptr->%s);\n" % (i.fixname))
                c_file.write("    ptr->%s = NULL;\n" % (i.fixname))
            elif i.subtyp == 'object' or i.subtypobj is not None:
                if i.subtypname is not None:
                    free_func = i.subtypname
                else:
                    free_func = helpers.get_name_substr(i.name, prefix)
                c_file.write("    if (ptr->%s != NULL) {\n" % i.fixname)
                c_file.write("        size_t i;\n")
                c_file.write("        for (i = 0; i < ptr->%s_len; i++)\n" % i.fixname)
                c_file.write("            if (ptr->%s[i] != NULL) {\n" % (i.fixname))
                c_file.write("                free_%s(ptr->%s[i]);\n" % (free_func, i.fixname))
                c_file.write("                ptr->%s[i] = NULL;\n" % (i.fixname))
                c_file.write("            }\n")
                c_file.write("        free(ptr->%s);\n" % i.fixname)
                c_file.write("        ptr->%s = NULL;\n" % (i.fixname))
                c_file.write("    }\n")
            c_typ = helpers.obtain_pointer(i.name, i.subtypobj, prefix)
            if c_typ == "":
                continue
            if i.subobj is not None:
                c_typ = c_typ + "_element"
            c_file.write("    free_%s(ptr->%s);\n" % (c_typ, i.fixname))
            c_file.write("    ptr->%s = NULL;\n" % (i.fixname))
        else:
            typename = helpers.get_prefixe_name(i.name, prefix)
            if i.typ == 'string' or i.typ == 'booleanPointer' or \
                    helpers.judge_data_pointer_type(i.typ):
                c_file.write("    free(ptr->%s);\n" % (i.fixname))
                c_file.write("    ptr->%s = NULL;\n" % (i.fixname))
            elif i.typ == 'object':
                if i.subtypname is not None:
                    typename = i.subtypname
                c_file.write("    if (ptr->%s != NULL) {\n" % (i.fixname))
                c_file.write("        free_%s(ptr->%s);\n" % (typename, i.fixname))
                c_file.write("        ptr->%s = NULL;\n" % (i.fixname))
                c_file.write("    }\n")
    c_file.write("    free(ptr);\n")
    c_file.write("}\n\n")


def c_file_map_str(c_file, child, childname):
    """
    Description: generate c code for map string
    Interface: None
    History: 2019-10-31
    """
    c_file.write("    if (ptr->keys != NULL && ptr->%s != NULL) {\n" % child.fixname)
    c_file.write("        size_t i;\n")
    c_file.write("        for (i = 0; i < ptr->len; i++) {\n")
    c_file.write("            free(ptr->keys[i]);\n")
    c_file.write("            ptr->keys[i] = NULL;\n")
    c_file.write("            free_%s(ptr->%s[i]);\n" % (childname, child.fixname))
    c_file.write("            ptr->%s[i] = NULL;\n" % (child.fixname))
    c_file.write("        }\n")
    c_file.write("        free(ptr->keys);\n")
    c_file.write("        ptr->keys = NULL;\n")
    c_file.write("        free(ptr->%s);\n" % (child.fixname))
    c_file.write("        ptr->%s = NULL;\n" % (child.fixname))
    c_file.write("    }\n")


def c_file_str(c_file, i):
    """
    Description: generate c code template
    Interface: None
    History: 2019-10-31
    """
    c_file.write("    if (ptr->%s != NULL) {\n" % i.fixname)
    c_file.write("        size_t i;\n")
    c_file.write("        for (i = 0; i < ptr->%s_len; i++) {\n" % i.fixname)
    c_file.write("            if (ptr->%s[i] != NULL) {\n" % (i.fixname))
    c_file.write("                free(ptr->%s[i]);\n" % (i.fixname))
    c_file.write("                ptr->%s[i] = NULL;\n" % (i.fixname))
    c_file.write("            }\n")
    c_file.write("        }\n")
    c_file.write("        free(ptr->%s);\n" % (i.fixname))
    c_file.write("        ptr->%s = NULL;\n" % (i.fixname))
    c_file.write("    }\n")


def src_reflect(structs, schema_info, c_file, root_typ):
    """
    Description: reflect code
    Interface: None
    History: 2019-06-17
    """
    c_file.write("// Generated from %s. Do not edit!\n" \
                 % (schema_info.name.basename))
    c_file.write("#ifndef _GNU_SOURCE\n")
    c_file.write("#define _GNU_SOURCE\n")
    c_file.write("#endif\n")
    c_file.write('#include <string.h>\n')
    c_file.write('#include <read_file.h>\n')
    c_file.write('#include "%s"\n\n' % schema_info.header.basename)
    for i in structs:
        append_c_code(i, c_file, schema_info.prefix)
    get_c_epilog(c_file, schema_info.prefix, root_typ)


def get_c_epilog(c_file, prefix, typ):
    """
    Description: generate c language epilogue
    Interface: None
    History: 2019-06-17
    """
    if typ != 'array' and typ != 'object':
        return
    if typ == 'array':
        c_file.write("""\n
%s_element **make_%s(yajl_val tree, const struct parser_context *ctx, parser_error *err, size_t *len) {
    %s_element **ptr = NULL;
    size_t i, alen;
    if (tree == NULL || err == NULL || !len || YAJL_GET_ARRAY(tree) == NULL)
        return NULL;
    *err = 0;
    alen = YAJL_GET_ARRAY(tree)->len;
    if (alen == 0)
        return NULL;
    ptr = safe_malloc((alen + 1) * sizeof(%s_element *));
    for (i = 0; i < alen; i++) {
        yajl_val val = YAJL_GET_ARRAY(tree)->values[i];
        ptr[i] = make_%s_element(val, ctx, err);
        if (ptr[i] == NULL) {
            free_%s(ptr, alen);
            return NULL;
        }
    }
    *len = alen;
    return ptr;
}
""" % (prefix, prefix, prefix, prefix, prefix, prefix))
        c_file.write("""\n
void free_%s(%s_element **ptr, size_t len) {
    size_t i;

    if (ptr == NULL || len == 0)
        return;

    for (i = 0; i < len; i++) {
        if (ptr[i] != NULL) {
            free_%s_element(ptr[i]);
            ptr[i] = NULL;
        }
    }
    free(ptr);
}
""" % (prefix, prefix, prefix))
        c_file.write("""\n
yajl_gen_status gen_%s(yajl_gen g, const %s_element **ptr, size_t len, const struct parser_context *ctx,
                       parser_error *err) {
    yajl_gen_status stat;
    size_t i;
    *err = 0;
    stat = yajl_gen_array_open((yajl_gen)g);
    if (yajl_gen_status_ok != stat)
        GEN_SET_ERROR_AND_RETURN(stat, err);
    for (i = 0; i < len; i++) {
        stat = gen_%s_element(g, ptr[i], ctx, err);
        if (yajl_gen_status_ok != stat)
            GEN_SET_ERROR_AND_RETURN(stat, err);
    }
    stat = yajl_gen_array_close((yajl_gen)g);
    if (yajl_gen_status_ok != stat)
        GEN_SET_ERROR_AND_RETURN(stat, err);
    return yajl_gen_status_ok;
}
""" % (prefix, prefix, prefix))
    c_file.write("""
%s%s*%s_parse_file(const char *filename, const struct parser_context *ctx, parser_error *err%s) {
    %s%s*ptr = NULL;""" % (prefix, ' ' if typ == 'object' else '_element *', \
                           prefix, '' if typ == 'object' else ', size_t *len', \
                           prefix, ' ' if typ == 'object' else '_element *'))
    c_file.write("""
    size_t filesize;
    char *content = NULL;

    if (filename == NULL || err == NULL)
        return NULL;

    *err = NULL;
    content = read_file(filename, &filesize);
    if (content == NULL) {
        if (asprintf(err, "cannot read the file: %%s", filename) < 0)
            *err = safe_strdup("error allocating memory");
        return NULL;
    }
    ptr = %s_parse_data(content, ctx, err%s);
    free(content);
    return ptr;
}
""" % (prefix, '' if typ == 'object' else ', len'))
    c_file.write("""
%s%s*%s_parse_file_stream(FILE *stream, const struct parser_context *ctx, parser_error *err%s) {
    %s%s*ptr = NULL;""" % (prefix, ' ' if typ == 'object' else '_element *', \
                           prefix, '' if typ == 'object' else ', size_t *len', \
                           prefix, ' ' if typ == 'object' else '_element *'))
    c_file.write("""
    size_t filesize;
    char *content = NULL ;

    if (stream == NULL || err == NULL)
        return NULL;

    *err = NULL;
    content = fread_file(stream, &filesize);
    if (content == NULL) {
        *err = safe_strdup("cannot read the file");
        return NULL;
    }
    ptr = %s_parse_data(content, ctx, err%s);
    free(content);
    return ptr;
}
""" % (prefix, '' if typ == 'object' else ', len'))
    c_file.write("""
%s%s*%s_parse_data(const char *jsondata, const struct parser_context *ctx, parser_error *err%s) {
    %s%s*ptr = NULL;""" % (prefix, ' ' if typ == 'object' else '_element *', \
                           prefix, '' if typ == 'object' else ', size_t *len', \
                           prefix, ' ' if typ == 'object' else '_element *'))
    c_file.write("""
    yajl_val tree;
    char errbuf[1024];
    struct parser_context tmp_ctx = { 0 };

    if (jsondata == NULL || err == NULL)
        return NULL;

    *err = NULL;
    if (ctx == NULL) {
       ctx = (const struct parser_context *)(&tmp_ctx);
    }
    tree = yajl_tree_parse(jsondata, errbuf, sizeof(errbuf));
    if (tree == NULL) {
        if (asprintf(err, "cannot parse the data: %%s", errbuf) < 0)
            *err = safe_strdup("error allocating memory");
        return NULL;
    }
    ptr = make_%s(tree, ctx, err%s);
    yajl_tree_free(tree);
    return ptr;
}
""" % (prefix, '' if typ == 'object' else ', len'))
    c_file.write("char *%s_generate_json(const %s%s*ptr%s, const struct parser_context *ctx," \
                 " parser_error *err) {" % (prefix, prefix, \
                                            ' ' if typ == 'object' else '_element *', \
                                            '' if typ == 'object' else ', size_t len'))
    c_file.write("""
    yajl_gen g = NULL;
    struct parser_context tmp_ctx = { 0 };
    const unsigned char *gen_buf = NULL;
    char *json_buf = NULL;
    size_t gen_len = 0;

    if (ptr == NULL || err == NULL)
        return NULL;

    *err = NULL;
    if (ctx == NULL) {
        ctx = (const struct parser_context *)(&tmp_ctx);
    }

    if (!json_gen_init(&g, ctx)) {
        *err = safe_strdup("Json_gen init failed");
        goto out;
    }
    if (yajl_gen_status_ok != gen_%s(g, ptr%s, ctx, err)) {
        if (*err == NULL)
            *err = safe_strdup("Failed to generate json");
        goto free_out;
    }
    yajl_gen_get_buf(g, &gen_buf, &gen_len);
    if (gen_buf == NULL) {
        *err = safe_strdup("Error to get generated json");
        goto free_out;
    }

    json_buf = safe_malloc(gen_len + 1);
    (void)memcpy(json_buf, gen_buf, gen_len);
    json_buf[gen_len] = '\\0';

free_out:
    yajl_gen_clear(g);
    yajl_gen_free(g);
out:
    return json_buf;
}

""" % (prefix, '' if typ == 'object' else ', len'))