tests/test-json.c

   1 /*
   2  * Copyright (c) 2009, 2010 Nicira Networks.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at:
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 #include <config.h>
  18
  19 #include "json.h"
  20
  21 #include <ctype.h>
  22 #include <errno.h>
  23 #include <getopt.h>
  24 #include <stdio.h>
  25
  26 #include "util.h"
  27
  28 /* --pretty: If set, the JSON output is pretty-printed, instead of printed as
  29  * compactly as possible.  */
  30 static int pretty = 0;
  31
  32 /* --multiple: If set, the input is a sequence of JSON objects or arrays,
  33  * instead of exactly one object or array. */
  34 static int multiple = 0;
  35
  36 static bool
  37 print_and_free_json(struct json *json)
  38 {
  39     bool ok;
  40     if (json->type == JSON_STRING) {
  41         printf("error: %s\n", json->u.string);
  42         ok = false;
  43     } else {
  44         char *s = json_to_string(json, JSSF_SORT | (pretty ? JSSF_PRETTY : 0));
  45         puts(s);
  46         free(s);
  47         ok = true;
  48     }
  49     json_destroy(json);
  50     return ok;
  51 }
  52
  53 static bool
  54 refill(FILE *file, void *buffer, size_t buffer_size, size_t *n, size_t *used)
  55 {
  56     *used = 0;
  57     if (feof(file)) {
  58         *n = 0;
  59         return false;
  60     } else {
  61         *n = fread(buffer, 1, buffer_size, file);
  62         if (ferror(file)) {
  63             ovs_fatal(errno, "Error reading input file");
  64         }
  65         return *n > 0;
  66     }
  67 }
  68
  69 static bool
  70 parse_multiple(FILE *stream)
  71 {
  72     struct json_parser *parser;
  73     char buffer[BUFSIZ];
  74     size_t n, used;
  75     bool ok;
  76
  77     parser = NULL;
  78     n = used = 0;
  79     ok = true;
  80     while (used < n || refill(stream, buffer, sizeof buffer, &n, &used)) {
  81         if (!parser && isspace((unsigned char) buffer[used])) {
  82             /* Skip white space. */
  83             used++;
  84         } else {
  85             if (!parser) {
  86                 parser = json_parser_create(0);
  87             }
  88
  89             used += json_parser_feed(parser, &buffer[used], n - used);
  90             if (used < n) {
  91                 if (!print_and_free_json(json_parser_finish(parser))) {
  92                     ok = false;
  93                 }
  94                 parser = NULL;
  95             }
  96         }
  97     }
  98     if (parser) {
  99         if (!print_and_free_json(json_parser_finish(parser))) {
 100             ok = false;
 101         }
 102     }
 103     return ok;
 104 }
 105
 106 int
 107 main(int argc, char *argv[])
 108 {
 109     const char *input_file;
 110     FILE *stream;
 111     bool ok;
 112
 113     set_program_name(argv[0]);
 114
 115     for (;;) {
 116         static const struct option options[] = {
 117             {"pretty", no_argument, &pretty, 1},
 118             {"multiple", no_argument, &multiple, 1},
 119         };
 120         int option_index = 0;
 121         int c = getopt_long (argc, argv, "", options, &option_index);
 122
 123         if (c == -1) {
 124             break;
 125         }
 126         switch (c) {
 127         case 0:
 128             break;
 129
 130         case '?':
 131             exit(1);
 132
 133         default:
 134             abort();
 135         }
 136     }
 137
 138     if (argc - optind != 1) {
 139         ovs_fatal(0, "usage: %s [--pretty] [--multiple] INPUT.json",
 140                   program_name);
 141     }
 142
 143     input_file = argv[optind];
 144     stream = !strcmp(input_file, "-") ? stdin : fopen(input_file, "r");
 145     if (!stream) {
 146         ovs_fatal(errno, "Cannot open \"%s\"", input_file);
 147     }
 148
 149     if (multiple) {
 150         ok = parse_multiple(stream);
 151     } else {
 152         ok = print_and_free_json(json_from_stream(stream));
 153     }
 154
 155     fclose(stream);
 156
 157     return !ok;
 158 }