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APPLICATION = pkg_jsmn
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include ../Makefile.tests_common |
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USEPKG += jsmn
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include $(RIOTBASE)/Makefile.include |
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/*
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* Copyright (c) 2010 Serge A. Zaitsev |
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* |
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* Permission is hereby granted, free of charge, to any person obtaining a copy |
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* of this software and associated documentation files (the "Software"), to deal |
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* in the Software without restriction, including without limitation the rights |
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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* copies of the Software, and to permit persons to whom the Software is |
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* furnished to do so, subject to the following conditions: |
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* |
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* The above copyright notice and this permission notice shall be included in |
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* all copies or substantial portions of the Software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
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* THE SOFTWARE. |
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* |
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* adapted to RIOT by Kaspar Schleiser <kaspar@schleiser.de> |
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* |
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* changes: - reduced nr of expected tokens to 16, stack would overflow |
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* otherwise with default stacksize on Cortex-M |
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*/ |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include "jsmn.h" |
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/*
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* A small example of jsmn parsing when JSON structure is known and number of |
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* tokens is predictable. |
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*/ |
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const char *JSON_STRING = |
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"{\"user\": \"johndoe\", \"admin\": false, \"uid\": 1000,\n " |
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"\"groups\": [\"users\", \"wheel\", \"audio\", \"video\"]}"; |
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static int jsoneq(const char *json, jsmntok_t *tok, const char *s) |
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{ |
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if (tok->type == JSMN_STRING && (int) strlen(s) == tok->end - tok->start && |
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strncmp(json + tok->start, s, tok->end - tok->start) == 0) { |
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return 0; |
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} |
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return -1; |
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} |
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int main(void) |
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{ |
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int i; |
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int r; |
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jsmn_parser p; |
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jsmntok_t t[16]; /* We expect no more than 16 tokens */ |
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jsmn_init(&p); |
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r = jsmn_parse(&p, JSON_STRING, strlen(JSON_STRING), t, sizeof(t) / sizeof(t[0])); |
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if (r < 0) { |
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printf("Failed to parse JSON: %d\n", r); |
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return 1; |
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} |
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/* Assume the top-level element is an object */ |
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if (r < 1 || t[0].type != JSMN_OBJECT) { |
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printf("Object expected\n"); |
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return 1; |
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} |
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/* Loop over all keys of the root object */ |
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for (i = 1; i < r; i++) { |
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if (jsoneq(JSON_STRING, &t[i], "user") == 0) { |
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/* We may use strndup() to fetch string value */ |
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printf("- User: %.*s\n", t[i + 1].end - t[i + 1].start, |
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JSON_STRING + t[i + 1].start); |
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i++; |
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} |
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else if (jsoneq(JSON_STRING, &t[i], "admin") == 0) { |
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/* We may additionally check if the value is either "true" or "false" */ |
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printf("- Admin: %.*s\n", t[i + 1].end - t[i + 1].start, |
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JSON_STRING + t[i + 1].start); |
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i++; |
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} |
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else if (jsoneq(JSON_STRING, &t[i], "uid") == 0) { |
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/* We may want to do strtol() here to get numeric value */ |
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printf("- UID: %.*s\n", t[i + 1].end - t[i + 1].start, |
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JSON_STRING + t[i + 1].start); |
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i++; |
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} |
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else if (jsoneq(JSON_STRING, &t[i], "groups") == 0) { |
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int j; |
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printf("- Groups:\n"); |
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if (t[i + 1].type != JSMN_ARRAY) { |
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continue; /* We expect groups to be an array of strings */ |
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} |
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for (j = 0; j < t[i + 1].size; j++) { |
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jsmntok_t *g = &t[i + j + 2]; |
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printf(" * %.*s\n", g->end - g->start, JSON_STRING + g->start); |
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} |
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i += t[i + 1].size + 1; |
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} |
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else { |
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printf("Unexpected key: %.*s\n", t[i].end - t[i].start, |
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JSON_STRING + t[i].start); |
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} |
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} |
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return 0; |
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} |
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