#include <stdio.h>
-#include <string.h>
#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
#include "../jsmn.c"
/*
- * A small example of jsmn parsing when JSON structure is known and number of
- * tokens is predictable.
+ * An example of reading JSON from stdin and printing its content to stdout.
+ * The output looks like YAML, but I'm not sure if it's really compatible.
*/
-/*char *JSON_S =
- "{\"user\": \"johndoe\", \"admin\": false, \"uid\": 1000,\n "
- "\"groups\": [\"users\", \"wheel\", \"audio\", \"video\"]}";*/
-
-char *JSON_STRING;
-
-long int filesize(FILE *fp)\r
-{\r
- long int save_pos, size_of_file;\r
-\r
- save_pos = ftell(fp);\r
- fseek(fp, 0L, SEEK_END);\r
- size_of_file = ftell(fp);\r
- fseek(fp, save_pos, SEEK_SET);\r
- return(size_of_file);\r
-}
-
-static int jsoneq(const char *json, jsmntok_t *tok, const char *s) {
- if (tok->type == JSMN_STRING && (int) strlen(s) == tok->end - tok->start &&
- strncmp(json + tok->start, s, tok->end - tok->start) == 0) {
+static int dump(const char *js, jsmntok_t *t, size_t count, int indent) {
+ int i, j, k;
+ if (count == 0) {
return 0;
}
- return -1;
+ if (t->type == JSMN_PRIMITIVE) {
+ printf("%.*s", t->end - t->start, js+t->start);
+ return 1;
+ } else if (t->type == JSMN_STRING) {
+ printf("'%.*s'", t->end - t->start, js+t->start);
+ return 1;
+ } else if (t->type == JSMN_OBJECT) {
+ printf("\n");
+ j = 0;
+ for (i = 0; i < t->size; i++) {
+ for (k = 0; k < indent; k++) printf(" ");
+ j += dump(js, t+1+j, count-j, indent+1);
+ printf(": ");
+ j += dump(js, t+1+j, count-j, indent+1);
+ printf("\n");
+ }
+ return j+1;
+ } else if (t->type == JSMN_ARRAY) {
+ j = 0;
+ printf("\n");
+ for (i = 0; i < t->size; i++) {
+ for (k = 0; k < indent-1; k++) printf(" ");
+ printf(" - ");
+ j += dump(js, t+1+j, count-j, indent+1);
+ printf("\n");
+ }
+ return j+1;
+ }
+ return 0;
}
int main() {
- int i;
- int r;
- jsmn_parser p;
FILE *fh = fopen("../../../../data/test.map", "r");
- jsmntok_t t[1536]; /* We expect no more than 128 tokens */
- char JSON_S[6144];
- memset(JSON_S, 0, sizeof(JSON_S));
+ int r;
+ int eof_expected = 0;
+ char *js = NULL;
+ size_t jslen = 0;
+ char buf[BUFSIZ];
- if(fh != NULL)
- {
- fread(JSON_S, sizeof(char), filesize(fh), fh);
- // we can now close the file
- //printf("]%s[\n", JSON_S);
- JSON_STRING=JSON_S;
- //printf("[[%s]]\n", JSON_STRING);
+ jsmn_parser p;
+ jsmntok_t *tok;
+ size_t tokcount = 2;
+ /* Prepare parser */
jsmn_init(&p);
- r = jsmn_parse(&p, JSON_STRING, filesize(fh), t, sizeof(t)/sizeof(t[0]));
- fclose(fh); fh = NULL;
- printf("%s", JSON_STRING);
- if (r < 0) {
- printf("Failed to parse JSON: %d\n", r);
- return 1;
- }
- /* Assume the top-level element is an object */
- if (r < 1 || t[0].type != JSMN_OBJECT) {
- printf("Object expected\n");
- return 1;
+ /* Allocate some tokens as a start */
+ tok = malloc(sizeof(*tok) * tokcount);
+ if (tok == NULL) {
+ fprintf(stderr, "malloc(): errno=%d\n", errno);
+ return 3;
}
- /* Loop over all keys of the root object */
- for (i = 1; i < r; i++) {
- if (jsoneq(JSON_STRING, &t[i], "image") == 0) {
- /* We may use strndup() to fetch string value */
- printf("- image: %.*s\n", t[i+1].end-t[i+1].start,
- JSON_STRING + t[i+1].start);
- i++;
- } else if (jsoneq(JSON_STRING, &t[i], "admin") == 0) {
- /* We may additionally check if the value is either "true" or "false" */
- printf("- Admin: %.*s\n", t[i+1].end-t[i+1].start,
- JSON_STRING + t[i+1].start);
- i++;
- } else if (jsoneq(JSON_STRING, &t[i], "uid") == 0) {
- /* We may want to do strtol() here to get numeric value */
- printf("- UID: %.*s\n", t[i+1].end-t[i+1].start,
- JSON_STRING + t[i+1].start);
- i++;
- } else if (jsoneq(JSON_STRING, &t[i], "tilesets") == 0) {
- int j;
- printf("- tilesets:\n");
- if (t[i+1].type != JSMN_ARRAY) {
- continue; /* We expect groups to be an array of strings */
+ for (;;) {
+ /* Read another chunk */
+ r = fread(buf, 1, sizeof(buf), fh);
+ if (r < 0) {
+ fprintf(stderr, "fread(): %d, errno=%d\n", r, errno);
+ return 1;
+ }
+ if (r == 0) {
+ if (eof_expected != 0) {
+ return 0;
+ } else {
+ fprintf(stderr, "fread(): unexpected EOF\n");
+ return 2;
}
- for (j = 0; j < t[i+1].size; j++) {
- jsmntok_t *g = &t[i+j+2];
- printf(" * %.*s\n", g->end - g->start, JSON_STRING + g->start);
+ }
+
+ js = realloc(js, jslen + r + 1);
+ if (js == NULL) {
+ fprintf(stderr, "realloc(): errno=%d\n", errno);
+ return 3;
+ }
+ strncpy(js + jslen, buf, r);
+ jslen = jslen + r;
+
+again:
+ r = jsmn_parse(&p, js, jslen, tok, tokcount);
+ if (r < 0) {
+ if (r == JSMN_ERROR_NOMEM) {
+ tokcount = tokcount * 2;
+ tok = realloc(tok, sizeof(*tok) * tokcount);
+ if (tok == NULL) {
+ fprintf(stderr, "realloc(): errno=%d\n", errno);
+ return 3;
+ }
+ goto again;
}
- i += t[i+1].size + 1;
} else {
- printf("Unexpected key: %.*s\n", t[i].end-t[i].start,
- JSON_STRING + t[i].start);
+ dump(js, tok, p.toknext, 0);
+ eof_expected = 1;
}
}
- //free(JSON_STRING);
- }
- if (fh != NULL) fclose(fh);
- ////}
return 0;
}
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