jshn.c

   1 /*
   2  * Copyright (C) 2011-2013 Felix Fietkau <nbd@openwrt.org>
   3  *
   4  * Permission to use, copy, modify, and/or distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  */
  16 #ifdef JSONC
  17         #include <json.h>
  18 #else
  19         #include <json/json.h>
  20 #endif
  21
  22 #include <string.h>
  23 #include <stdlib.h>
  24 #include <stdio.h>
  25 #include <stdbool.h>
  26 #include <ctype.h>
  27 #include <getopt.h>
  28 #include "list.h"
  29
  30 #include "blob.h"
  31 #include "blobmsg_json.h"
  32
  33 #define MAX_VARLEN      256
  34
  35 static struct blob_buf b = { 0 };
  36
  37 static const char *var_prefix = "";
  38 static int var_prefix_len = 0;
  39
  40 static int add_json_element(const char *key, json_object *obj);
  41
  42 static int add_json_object(json_object *obj)
  43 {
  44         int ret = 0;
  45
  46         json_object_object_foreach(obj, key, val) {
  47                 ret = add_json_element(key, val);
  48                 if (ret)
  49                         break;
  50         }
  51         return ret;
  52 }
  53
  54 static int add_json_array(struct array_list *a)
  55 {
  56         char seq[12];
  57         int i, len;
  58         int ret;
  59
  60         for (i = 0, len = array_list_length(a); i < len; i++) {
  61                 sprintf(seq, "%d", i);
  62                 ret = add_json_element(seq, array_list_get_idx(a, i));
  63                 if (ret)
  64                         return ret;
  65         }
  66
  67         return 0;
  68 }
  69
  70 static void add_json_string(const char *str)
  71 {
  72         char *ptr = (char *) str;
  73         int len;
  74         char *c;
  75
  76         while ((c = strchr(ptr, '\'')) != NULL) {
  77                 len = c - ptr;
  78                 if (len > 0)
  79                         fwrite(ptr, len, 1, stdout);
  80                 ptr = c + 1;
  81                 c = "'\\''";
  82                 fwrite(c, strlen(c), 1, stdout);
  83         }
  84         len = strlen(ptr);
  85         if (len > 0)
  86                 fwrite(ptr, len, 1, stdout);
  87 }
  88
  89 static void write_key_string(const char *key)
  90 {
  91         while (*key) {
  92                 putc(isalnum(*key) ? *key : '_', stdout);
  93                 key++;
  94         }
  95 }
  96
  97 static int add_json_element(const char *key, json_object *obj)
  98 {
  99         char *type;
 100
 101         if (!obj)
 102                 return -1;
 103
 104         switch (json_object_get_type(obj)) {
 105         case json_type_object:
 106                 type = "object";
 107                 break;
 108         case json_type_array:
 109                 type = "array";
 110                 break;
 111         case json_type_string:
 112                 type = "string";
 113                 break;
 114         case json_type_boolean:
 115                 type = "boolean";
 116                 break;
 117         case json_type_int:
 118                 type = "int";
 119                 break;
 120         case json_type_double:
 121                 type = "double";
 122                 break;
 123         default:
 124                 return -1;
 125         }
 126
 127         fprintf(stdout, "json_add_%s '", type);
 128         write_key_string(key);
 129
 130         switch (json_object_get_type(obj)) {
 131         case json_type_object:
 132                 fprintf(stdout, "';\n");
 133                 add_json_object(obj);
 134                 fprintf(stdout, "json_close_object;\n");
 135                 break;
 136         case json_type_array:
 137                 fprintf(stdout, "';\n");
 138                 add_json_array(json_object_get_array(obj));
 139                 fprintf(stdout, "json_close_array;\n");
 140                 break;
 141         case json_type_string:
 142                 fprintf(stdout, "' '");
 143                 add_json_string(json_object_get_string(obj));
 144                 fprintf(stdout, "';\n");
 145                 break;
 146         case json_type_boolean:
 147                 fprintf(stdout, "' %d;\n", json_object_get_boolean(obj));
 148                 break;
 149         case json_type_int:
 150                 fprintf(stdout, "' %d;\n", json_object_get_int(obj));
 151                 break;
 152         case json_type_double:
 153                 fprintf(stdout, "' %lf;\n", json_object_get_double(obj));
 154                 break;
 155         default:
 156                 return -1;
 157         }
 158
 159         return 0;
 160 }
 161
 162 static int jshn_parse(const char *str)
 163 {
 164         json_object *obj;
 165
 166         obj = json_tokener_parse(str);
 167         if (!obj || json_object_get_type(obj) != json_type_object) {
 168                 fprintf(stderr, "Failed to parse message data\n");
 169                 return 1;
 170         }
 171         fprintf(stdout, "json_init;\n");
 172         add_json_object(obj);
 173         fflush(stdout);
 174
 175         return 0;
 176 }
 177
 178 static char *get_keys(const char *prefix)
 179 {
 180         char *keys;
 181
 182         keys = alloca(var_prefix_len + strlen(prefix) + sizeof("K_") + 1);
 183         sprintf(keys, "%sK_%s", var_prefix, prefix);
 184         return getenv(keys);
 185 }
 186
 187 static void get_var(const char *prefix, const char **name, char **var, char **type)
 188 {
 189         char *tmpname, *varname;
 190
 191         tmpname = alloca(var_prefix_len + strlen(prefix) + 1 + strlen(*name) + 1 + sizeof("T_"));
 192
 193         sprintf(tmpname, "%s%s_%s", var_prefix, prefix, *name);
 194         *var = getenv(tmpname);
 195
 196         sprintf(tmpname, "%sT_%s_%s", var_prefix, prefix, *name);
 197         *type = getenv(tmpname);
 198
 199         sprintf(tmpname, "%sN_%s_%s", var_prefix, prefix, *name);
 200         varname = getenv(tmpname);
 201         if (varname)
 202                 *name = varname;
 203 }
 204
 205 static json_object *jshn_add_objects(json_object *obj, const char *prefix, bool array);
 206
 207 static void jshn_add_object_var(json_object *obj, bool array, const char *prefix, const char *name)
 208 {
 209         json_object *new;
 210         char *var, *type;
 211
 212         get_var(prefix, &name, &var, &type);
 213         if (!var || !type)
 214                 return;
 215
 216         if (!strcmp(type, "array")) {
 217                 new = json_object_new_array();
 218                 jshn_add_objects(new, var, true);
 219         } else if (!strcmp(type, "object")) {
 220                 new = json_object_new_object();
 221                 jshn_add_objects(new, var, false);
 222         } else if (!strcmp(type, "string")) {
 223                 new = json_object_new_string(var);
 224         } else if (!strcmp(type, "int")) {
 225                 new = json_object_new_int(atoi(var));
 226         } else if (!strcmp(type, "double")) {
 227                 new = json_object_new_double(strtod(var, NULL));
 228         } else if (!strcmp(type, "boolean")) {
 229                 new = json_object_new_boolean(!!atoi(var));
 230         } else {
 231                 return;
 232         }
 233
 234         if (array)
 235                 json_object_array_add(obj, new);
 236         else
 237                 json_object_object_add(obj, name, new);
 238 }
 239
 240 static json_object *jshn_add_objects(json_object *obj, const char *prefix, bool array)
 241 {
 242         char *keys, *key, *brk;
 243
 244         keys = get_keys(prefix);
 245         if (!keys || !obj)
 246                 goto out;
 247
 248         for (key = strtok_r(keys, " ", &brk); key;
 249              key = strtok_r(NULL, " ", &brk)) {
 250                 jshn_add_object_var(obj, array, prefix, key);
 251         }
 252
 253 out:
 254         return obj;
 255 }
 256
 257 static int jshn_format(bool no_newline, bool indent)
 258 {
 259         json_object *obj;
 260         const char *output;
 261         char *blobmsg_output = NULL;
 262         int ret = -1;
 263
 264         if (!(obj = json_object_new_object()))
 265                 return -1;
 266
 267         jshn_add_objects(obj, "J_V", false);
 268         if (!(output = json_object_to_json_string(obj)))
 269                 goto out;
 270
 271         if (indent) {
 272                 blob_buf_init(&b, 0);
 273                 if (!blobmsg_add_json_from_string(&b, output))
 274                         goto out;
 275                 if (!(blobmsg_output = blobmsg_format_json_indent(b.head, 1, 0)))
 276                         goto out;
 277                 output = blobmsg_output;
 278         }
 279         fprintf(stdout, "%s%s", output, no_newline ? "" : "\n");
 280         free(blobmsg_output);
 281         ret = 0;
 282
 283 out:
 284         json_object_put(obj);
 285         return ret;
 286 }
 287
 288 static int usage(const char *progname)
 289 {
 290         fprintf(stderr, "Usage: %s [-n] [-i] -r <message>|-w\n", progname);
 291         return 2;
 292 }
 293
 294 int main(int argc, char **argv)
 295 {
 296         bool no_newline = false;
 297         bool indent = false;
 298         int ch;
 299
 300         while ((ch = getopt(argc, argv, "p:nir:w")) != -1) {
 301                 switch(ch) {
 302                 case 'p':
 303                         var_prefix = optarg;
 304                         var_prefix_len = strlen(var_prefix);
 305                         break;
 306                 case 'r':
 307                         return jshn_parse(optarg);
 308                 case 'w':
 309                         return jshn_format(no_newline, indent);
 310                 case 'n':
 311                         no_newline = true;
 312                         break;
 313                 case 'i':
 314                         indent = true;
 315                         break;
 316                 default:
 317                         return usage(argv[0]);
 318                 }
 319         }
 320         return usage(argv[0]);
 321 }