tests/test-json.c

   1 /*
   2  * Copyright (c) 2009 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(const char *input_file)
  71 {
  72     struct json_parser *parser;
  73     char buffer[BUFSIZ];
  74     size_t n, used;
  75     FILE *file;
  76     bool ok;
  77
  78     file = fopen(input_file, "r");
  79     if (!file) {
  80         ovs_fatal(errno, "Cannot open \"%s\"", input_file);
  81     }
  82
  83     parser = NULL;
  84     n = used = 0;
  85     ok = true;
  86     while (used < n || refill(file, buffer, sizeof buffer, &n, &used)) {
  87         if (!parser && isspace((unsigned char) buffer[used])) {
  88             /* Skip white space. */
  89             used++;
  90         } else {
  91             if (!parser) {
  92                 parser = json_parser_create(0);
  93             }
  94
  95             used = n - json_parser_feed(parser, &buffer[used], n - used);
  96             if (used < n) {
  97                 if (!print_and_free_json(json_parser_finish(parser))) {
  98                     ok = false;
  99                 }
 100                 parser = NULL;
 101             }
 102         }
 103     }
 104     if (parser) {
 105         if (!print_and_free_json(json_parser_finish(parser))) {
 106             ok = false;
 107         }
 108     }
 109     return ok;
 110 }
 111
 112 int
 113 main(int argc, char *argv[])
 114 {
 115     const char *input_file;
 116     bool ok;
 117
 118     set_program_name(argv[0]);
 119
 120     for (;;) {
 121         static const struct option options[] = {
 122             {"pretty", no_argument, &pretty, 1},
 123             {"multiple", no_argument, &multiple, 1},
 124         };
 125         int option_index = 0;
 126         int c = getopt_long (argc, argv, "", options, &option_index);
 127
 128         if (c == -1) {
 129             break;
 130         }
 131         switch (c) {
 132         case 0:
 133             break;
 134
 135         case '?':
 136             exit(1);
 137
 138         default:
 139             abort();
 140         }
 141     }
 142
 143     if (argc - optind != 1) {
 144         ovs_fatal(0, "usage: %s [--pretty] [--multiple] INPUT.json",
 145                   program_name);
 146     }
 147
 148     input_file = argv[optind];
 149     if (!strcmp(input_file, "-")) {
 150         input_file = "/dev/stdin";
 151     }
 152
 153     if (multiple) {
 154         ok = parse_multiple(input_file);
 155     } else {
 156         ok = print_and_free_json(json_from_file(input_file));
 157     }
 158
 159     return !ok;
 160 }