src/lib/jsmn/example/jsondump.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <string.h>
   4 #include <errno.h>
   5 #include "../jsmn.c"
   6
   7 /*
   8  * An example of reading JSON from stdin and printing its content to stdout.
   9  * The output looks like YAML, but I'm not sure if it's really compatible.
  10  */
  11 static int jsoneq(const char *json, jsmntok_t *tok, const char *s) {
  12         if (tok->type == JSMN_STRING && (int) strlen(s) == tok->end - tok->start &&
  13                         strncmp(json + tok->start, s, tok->end - tok->start) == 0) {
  14                 return 0;
  15         }
  16         return -1;
  17 }
  18
  19 static int dump(const char *js, jsmntok_t *t, size_t count, int indent) {
  20         int i, j, k;
  21         if (count == 0) {
  22                 return 0;
  23         }
  24         if (t->type == JSMN_PRIMITIVE) {
  25                 printf("%.*s", t->end - t->start, js+t->start);
  26                 return 1;
  27         } else if (t->type == JSMN_STRING) {
  28                                 if(jsoneq(js, t, "data") == 0 )
  29                 {
  30 //                      printf("[[[[%d|%d]]]]\n", &(t+1)->size, (t+1)->size);
  31                         printf("\n%.*s[xx[%d|%d]xx]\n", (t+1)->end - (t+1)->start, js+(t+1)->start, &(t+1)->size, (t+1)->size);
  32                 }
  33                 printf("'%.*s'", t->end - t->start, js+t->start);
  34                 return 1;
  35         } else if (t->type == JSMN_OBJECT) {
  36                 printf("\n");
  37                 j = 0;
  38                 for (i = 0; i < t->size; i++) {
  39                         for (k = 0; k < indent; k++) printf("  ");
  40                         j += dump(js, t+1+j, count-j, indent+1);
  41                         printf(": ");
  42                         j += dump(js, t+1+j, count-j, indent+1);
  43                         printf("\n");
  44                 }
  45                 return j+1;
  46         } else if (t->type == JSMN_ARRAY) {
  47                 j = 0;
  48                 printf("\n");
  49                 for (i = 0; i < t->size; i++) {
  50                         for (k = 0; k < indent-1; k++) printf("  ");
  51                         printf("   - ");
  52                         j += dump(js, t+1+j, count-j, indent+1);
  53                         printf("\n");
  54                 }
  55                 return j+1;
  56         }
  57         return 0;
  58 }
  59
  60 int main() {
  61         int r;
  62         int eof_expected = 0;
  63         char *js = NULL;
  64         size_t jslen = 0;
  65         char buf[BUFSIZ];
  66
  67         jsmn_parser p;
  68         jsmntok_t *tok;
  69         size_t tokcount = 2;
  70
  71         /* Prepare parser */
  72         jsmn_init(&p);
  73
  74         /* Allocate some tokens as a start */
  75         tok = malloc(sizeof(*tok) * tokcount);
  76         if (tok == NULL) {
  77                 fprintf(stderr, "malloc(): errno=%d\n", errno);
  78                 return 3;
  79         }
  80
  81         for (;;) {
  82                 /* Read another chunk */
  83                 r = fread(buf, 1, sizeof(buf), stdin);
  84                 if (r < 0) {
  85                         fprintf(stderr, "fread(): %d, errno=%d\n", r, errno);
  86                         return 1;
  87                 }
  88                 if (r == 0) {
  89                         if (eof_expected != 0) {
  90                                 return 0;
  91                         } else {
  92                                 fprintf(stderr, "fread(): unexpected EOF\n");
  93                                 return 2;
  94                         }
  95                 }
  96
  97                 js = realloc(js, jslen + r + 1);
  98                 if (js == NULL) {
  99                         fprintf(stderr, "realloc(): errno=%d\n", errno);
 100                         return 3;
 101                 }
 102                 strncpy(js + jslen, buf, r);
 103                 jslen = jslen + r;
 104
 105 again:
 106                 r = jsmn_parse(&p, js, jslen, tok, tokcount);
 107                 if (r < 0) {
 108                         if (r == JSMN_ERROR_NOMEM) {
 109                                 tokcount = tokcount * 2;
 110                                 tok = realloc(tok, sizeof(*tok) * tokcount);
 111                                 if (tok == NULL) {
 112                                         fprintf(stderr, "realloc(): errno=%d\n", errno);
 113                                         return 3;
 114                                 }
 115                                 goto again;
 116                         }
 117                 } else {
 118                         dump(js, tok, p.toknext, 0);
 119                         eof_expected = 1;
 120                 }
 121         }
 122
 123         return 0;
 124 }