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// (C) 2017 <>< Joshua Allen, Under MIT/x11 License.
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "json_helpers.h"
#include <jsmn.h>
#if !defined(__FreeBSD__) && !defined(__APPLE__)
#include <malloc.h>
#endif
#ifdef _MSC_VER
#include <stdarg.h>
// Windows doesn't provide asprintf, so we need to make it.
int asprintf(char **strp, const char *fmt, ...)
{
char* buff = NULL;
va_list listPointer;
va_start( listPointer, fmt );
size_t lenNeeded = _vscprintf(fmt, listPointer) + 1; // add one for a terminating null
if (lenNeeded > 1)
{
buff = (char*)malloc(lenNeeded);
if (buff)
{
int bytesWritten = _vsnprintf(buff, lenNeeded, fmt, listPointer);
if (bytesWritten < 0)
{
free(buff);
buff = NULL;
}
}
}
if (strp)
{
*strp = buff;
}
return (int)lenNeeded;
}
#endif
void json_write_float_array(FILE* f, const char* tag, float* v, uint8_t count) {
uint8_t i = 0;
char * str1 = NULL;
char * str2 = NULL;
asprintf(&str1,"\"%s\":[", tag);
for (i=0;i<count;++i) {
if ( (i+1) < count) {
asprintf(&str2, "%s\"%f\"", str1,v[i]);
} else {
asprintf(&str2, "%s\"%f\",", str1,v[i]);
}
free(str1);
str1=str2;
str2=NULL;
}
asprintf(&str2, "%s]", str1);
fputs(str2,f);
free(str1);
free(str2);
}
void json_write_double_array(FILE* f, const char* tag, double* v, uint8_t count) {
uint8_t i = 0;
char * str1 = NULL;
char * str2 = NULL;
asprintf(&str1,"\"%s\":[", tag);
for (i=0;i<count;++i) {
if (i<(count-1)) {
asprintf(&str2, "%s\"%f\",", str1,v[i]);
} else {
asprintf(&str2, "%s\"%f\"", str1,v[i]);
}
free(str1);
str1=str2;
str2=NULL;
}
asprintf(&str2, "%s]", str1);
fputs(str2,f);
free(str1);
free(str2);
}
void json_write_uint32(FILE* f, const char* tag, uint32_t v) {
fprintf(f, "\"%s\":\"%d\"", tag, v);
}
void json_write_float(FILE* f, const char* tag, float v) {
fprintf(f, "\"%s\":\"%f\"", tag, v);
}
void json_write_str(FILE* f, const char* tag, const char* v) {
fprintf(f, "\"%s\":\"%s\"", tag, v);
}
void (*json_begin_object)(char* tag) = NULL;
void (*json_end_object)() = NULL;
void (*json_tag_value)(char* tag, char** values, uint8_t count) = NULL;
uint32_t JSON_STRING_LEN;
char* load_file_to_mem(const char* path) {
FILE * f = fopen( path, "r" );
if (f==NULL) return NULL;
fseek( f, 0, SEEK_END );
int len = ftell( f );
fseek( f, 0, SEEK_SET );
char * JSON_STRING = malloc( len + 1);
memset(JSON_STRING,0,len+1);
fread( JSON_STRING, len, 1, f );
fclose( f );
return JSON_STRING;
}
static char* substr(const char* str, uint32_t start, uint32_t end, uint32_t npos) {
uint32_t l = end-start+1;
if (end<=start || end>=npos) return NULL;
char* x = malloc(l);
memcpy(x,str+start,l);
x[l-1] = '\0';
return x;
}
static uint16_t json_load_array(const char* JSON_STRING, jsmntok_t* tokens, uint16_t size, char* tag) {
jsmntok_t* t = tokens;
uint16_t i = 0;
char** values;
values = alloca(sizeof(char*) * size);
for (i=0;i<size;++i) {
t = tokens+i;
values[i] = substr(JSON_STRING, t->start, t->end, JSON_STRING_LEN);
}
if (json_tag_value != NULL) json_tag_value(tag, values, (uint8_t)i);
for (i=0;i<size;++i) free(values[i]);
return size;
}
void json_load_file(const char* path) {
uint32_t i = 0;
char* JSON_STRING = load_file_to_mem(path);
if (JSON_STRING==NULL) return;
JSON_STRING_LEN = (uint32_t)strlen(JSON_STRING);
jsmn_parser parser;
jsmn_init(&parser);
int32_t items = jsmn_parse(&parser, JSON_STRING, JSON_STRING_LEN, NULL, 0);
if (items < 0) return;
jsmntok_t* tokens = malloc(items * sizeof(jsmntok_t));
jsmn_init(&parser);
items = jsmn_parse(&parser, JSON_STRING, JSON_STRING_LEN, tokens, items);
int16_t children = -1;
for (i=0; i<(unsigned int)items; i+=2)
{
//increment i on each successful tag + values combination, not individual tokens
jsmntok_t* tag_t = tokens+i;
jsmntok_t* value_t = tokens+i+1;
char* tag = substr(JSON_STRING, tag_t->start, tag_t->end, JSON_STRING_LEN);
char* value = substr(JSON_STRING, value_t->start, value_t->end, JSON_STRING_LEN);
printf("%d %d c:%d %d %s \n", tag_t->start, tag_t->end, tag_t->size, tag_t->type, tag);
if (value_t->type == JSMN_ARRAY) {
i += json_load_array(JSON_STRING, tokens+i+2,value_t->size, tag); //look at array children
} else if (value_t->type == JSMN_OBJECT) {
printf("Begin Object\n");
if (json_begin_object != NULL) json_begin_object(tag);
children = value_t->size +1; //+1 to account for this loop where we are not yed parsing children
// i += decode_jsmn_object(JSON_STRING, tokens+i+2,value_t->size);
}
else {
if (json_tag_value != NULL) json_tag_value(tag, &value, 1);
}
if (children>=0) children--;
if (children == 0) {
children = -1;
printf("End Object\n");
if (json_end_object!=NULL) json_end_object();
}
// printf("%d %s \n", value_t->type, tag);
free(tag);
free(value);
}
free(JSON_STRING);
}
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