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