src/lib/jsmn/example/maptest2.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
  12 static int dump(const char *js, jsmntok_t *t, size_t count, int indent) {
  13         int i, j, k;
  14         if (count == 0) {
  15                 return 0;
  16         }
  17         //what the fuck is going on here?
  18         if (t->type == JSMN_PRIMITIVE) {
  19                 printf("%.*s", t->end - t->start, js+t->start);
  20                 printf("%s\n", js+t->start);
  21                 return 1;
  22         } else if (t->type == JSMN_STRING) {
  23                 printf("'%.*s'", t->end - t->start, js+t->start);
  24                 return 1;
  25         } else if (t->type == JSMN_OBJECT) {
  26                 printf("\n");
  27                 j = 0;
  28                 for (i = 0; i < t->size; i++) {
  29                         for (k = 0; k < indent; k++) printf("  ");
  30                         j += dump(js, t+1+j, count-j, indent+1);
  31                         printf(": ");
  32                         j += dump(js, t+1+j, count-j, indent+1);
  33                         printf("\n");
  34                 }
  35                 return j+1;
  36         } else if (t->type == JSMN_ARRAY) {
  37                 j = 0;
  38                 printf("\n");
  39                 for (i = 0; i < t->size; i++) {
  40                         for (k = 0; k < indent-1; k++) printf("  ");
  41                         printf("   - ");
  42                         j += dump(js, t+1+j, count-j, indent+1);
  43                         printf("\n");
  44                 }
  45                 return j+1;
  46         }
  47         return 0;
  48 }
  49
  50 static int jsoneq(const char *json, jsmntok_t *tok, const char *s) {
  51         if (tok->type == JSMN_STRING && (int) strlen(s) == tok->end - tok->start &&
  52                         strncmp(json + tok->start, s, tok->end - tok->start) == 0) {
  53                 return 0;
  54         }
  55         return -1;
  56 }
  57
  58 int main() {
  59         FILE *fh = fopen("../../../../data/test.map", "r");
  60         int r;
  61         int eof_expected = 0;
  62         char *js = NULL;
  63         size_t jslen = 0;
  64         char buf[BUFSIZ];
  65
  66         jsmn_parser p;
  67         jsmntok_t *tok;
  68         size_t tokcount = 2;
  69
  70         /* Prepare parser */
  71         jsmn_init(&p);
  72
  73         /* Allocate some tokens as a start */
  74         tok = malloc(sizeof(*tok) * tokcount);
  75         if (tok == NULL) {
  76                 fprintf(stderr, "malloc(): errno=%d\n", errno);
  77                 return 3;
  78         }
  79
  80         for (;;) {
  81                 /* Read another chunk */
  82                 r = fread(buf, 1, sizeof(buf), fh);
  83                 if (r < 0) {
  84                         fprintf(stderr, "fread(): %d, errno=%d\n", r, errno);
  85                         return 1;
  86                 }
  87                 if (r == 0) {
  88                         if (eof_expected != 0) {
  89                                 return 0;
  90                         } else {
  91                                 fprintf(stderr, "fread(): unexpected EOF\n");
  92                                 return 2;
  93                         }
  94                 }
  95
  96                 js = realloc(js, jslen + r + 1);
  97                 if (js == NULL) {
  98                         fprintf(stderr, "realloc(): errno=%d\n", errno);
  99                         return 3;
 100                 }
 101                 strncpy(js + jslen, buf, r);
 102                 jslen = jslen + r;
 103
 104 again:
 105                 r = jsmn_parse(&p, js, jslen, tok, tokcount);
 106                 if (r < 0) {
 107                         if (r == JSMN_ERROR_NOMEM) {
 108                                 tokcount = tokcount * 2;
 109                                 tok = realloc(tok, sizeof(*tok) * tokcount);
 110                                 if (tok == NULL) {
 111                                         fprintf(stderr, "realloc(): errno=%d\n", errno);
 112                                         return 3;
 113                                 }
 114                                 goto again;
 115                         }
 116                 } else {
 117                         dump(js, tok, p.toknext, 0);
 118                         eof_expected = 1;
 119                 }
 120         }
 121
 122         return 0;
 123 }