hush3/src/cc/dapps/oraclefeed.c

/******************************************************************************
 * Copyright © 2014-2018 The SuperNET Developers.                             *
 *                                                                            *
 * See the AUTHORS, DEVELOPER-AGREEMENT and LICENSE files at                  *
 * the top-level directory of this distribution for the individual copyright  *
 * holder information and the developer policies on copyright and licensing.  *
 *                                                                            *
 * Unless otherwise agreed in a custom licensing agreement, no part of the    *
 * SuperNET software, including this file may be copied, modified, propagated *
 * or distributed except according to the terms contained in the LICENSE file *
 *                                                                            *
 * Removal or modification of this copyright notice is prohibited.            *
 *                                                                            *
 ******************************************************************************/

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <memory.h>
#include "cJSON.c"

char *nonportable_path(char *str)
{
    int32_t i;
    for (i=0; str[i]!=0; i++)
        if ( str[i] == '/' )
            str[i] = '\\';
    return(str);
}

char *portable_path(char *str)
{
#ifdef _WIN32
    return(nonportable_path(str));
#else
#ifdef __PNACL
    /*int32_t i,n;
     if ( str[0] == '/' )
     return(str);
     else
     {
     n = (int32_t)strlen(str);
     for (i=n; i>0; i--)
     str[i] = str[i-1];
     str[0] = '/';
     str[n+1] = 0;
     }*/
#endif
    return(str);
#endif
}

void *loadfile(char *fname,uint8_t **bufp,long *lenp,long *allocsizep)
{
    FILE *fp;
    long  filesize,buflen = *allocsizep;
    uint8_t *buf = *bufp;
    *lenp = 0;
    if ( (fp= fopen(portable_path(fname),"rb")) != 0 )
    {
        fseek(fp,0,SEEK_END);
        filesize = ftell(fp);
        if ( filesize == 0 )
        {
            fclose(fp);
            *lenp = 0;
            printf("loadfile null size.(%s)\n",fname);
            return(0);
        }
        if ( filesize > buflen )
        {
            *allocsizep = filesize;
            *bufp = buf = (uint8_t *)realloc(buf,(long)*allocsizep+64);
        }
        rewind(fp);
        if ( buf == 0 )
            printf("Null buf ???\n");
        else
        {
            if ( fread(buf,1,(long)filesize,fp) != (unsigned long)filesize )
                printf("error reading filesize.%ld\n",(long)filesize);
            buf[filesize] = 0;
        }
        fclose(fp);
        *lenp = filesize;
        //printf("loaded.(%s)\n",buf);
    } //else printf("OS_loadfile couldnt load.(%s)\n",fname);
    return(buf);
}

void *filestr(long *allocsizep,char *_fname)
{
    long filesize = 0; char *fname,*buf = 0; void *retptr;
    *allocsizep = 0;
    fname = malloc(strlen(_fname)+1);
    strcpy(fname,_fname);
    retptr = loadfile(fname,&buf,&filesize,allocsizep);
    free(fname);
    return(retptr);
}

char *send_curl(char *url)
{
    long fsize; char curlstr[1024],*fname = "/tmp/oraclefeed.json"
    sprintf(curlstr,"curl --url \"%s\" > %s",url);
    system(curlstr);
    return(filestr(&fsize,fname));
}

cJSON *url_json(char *url)
{
    char *jsonstr; cJSON *json = 0;
    if ( (jsonstr= send_curl(url)) != 0 )
    {
        printf("(%s) -> (%s)\n",url,jsonstr);
        json = cJSON_Parse(jsonstr);
        free(jsonstr);
    }
    return(json);
}

int32_t main(int32_t argc,char **argv)
{
    cJSON *pjson,*bpi,*usd;
    printf("Powered by CoinDesk (%s)\n","https://www.coindesk.com/price/");
    if ( (pjson= url_json("http://api.coindesk.com/v1/bpi/currentprice.json","")) != 0 )
    {
        if ( (bpi= jobj(pjson,"bpi")) != 0 && (usd= jobj(bpi,"USD")) != 0 )
            printf("BTC/USD %.4f\n",jdouble(usd,"rate_float"));
        json_free(pjson);
    }
    return(0);
}