#include <stdio.h>
-#include <stdlib.h>
#include <string.h>
-#include <errno.h>
+#include <stdlib.h>
#include "../jsmn.c"
/*
- * 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.
+ * A small example of jsmn parsing when JSON structure is known and number of
+ * tokens is predictable.
*/
-static int dump(const char *js, jsmntok_t *t, size_t count, int indent) {
- int i, j, k;
- if (count == 0) {
- return 0;
- }
- //what the fuck is going on here?
- if (t->type == JSMN_PRIMITIVE) {
- printf("%.*s", t->end - t->start, js+t->start);
- printf("%s\n", 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;
+/*char *JSON_S =
+ "{\"user\": \"johndoe\", \"admin\": false, \"uid\": 1000,\n "
+ "\"groups\": [\"users\", \"wheel\", \"audio\", \"video\"]}";*/
+
+char *JSON_STRING;
+char JSON_S[BUFSIZ];
+
+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) {
}
int main() {
- FILE *fh = fopen("../../../../data/test.map", "r");
+ int i;
int r;
- int eof_expected = 0;
- char *js = NULL;
- size_t jslen = 0;
- char buf[BUFSIZ];
-
jsmn_parser p;
- jsmntok_t *tok;
- size_t tokcount = 2;
+ FILE *fh = fopen("../../../../data/test.map", "r");
+ jsmntok_t *t; /* We expect no more than 128 tokens */
+ size_t tokcount = 2048;
+ /* Allocate some tokens as a start */
+ t = malloc(sizeof(*t) * tokcount);
+ //memset(JSON_S, 0, sizeof(JSON_S));
+
+ if(fh != NULL)
+ {
+ fread(JSON_S, 1, filesize(fh), fh);
+ // we can now close the file
+ //printf("]%s[\n", JSON_S);
+ JSON_STRING=JSON_S;
+ //printf("[[%s]]\n", JSON_STRING);
- /* 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;
+ }
- /* Allocate some tokens as a start */
- tok = malloc(sizeof(*tok) * tokcount);
- if (tok == NULL) {
- fprintf(stderr, "malloc(): errno=%d\n", errno);
- return 3;
+ /* Assume the top-level element is an object */
+ if (r < 1 || t[0].type != JSMN_OBJECT) {
+ printf("Object expected\n");
+ return 1;
}
- 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;
+ /* 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 */
}
- }
-
- 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;
+ 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);
}
+ i += t[i+1].size + 1;
} else {
- dump(js, tok, p.toknext, 0);
- eof_expected = 1;
+ printf("Unexpected key: %.*s\n", t[i].end-t[i].start,
+ JSON_STRING + t[i].start);
}
}
+ //free(JSON_STRING);
+ }
+ if (fh != NULL) fclose(fh);
+ ////}
return 0;
}
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