91 lines
2.1 KiB
C
91 lines
2.1 KiB
C
#include <curl/curl.h>
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#include <errno.h>
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#include <error.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/param.h>
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#include "config.h"
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#define ARRLEN(a) (sizeof (a) / sizeof *(a))
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#define BUF_SIZE 256 * ARRLEN(WALLET)
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// {"bitcoin":{"usd":69420.69}}
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static int get_next_symbol(char *buf, float *price)
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{
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static const char output[] = "\"%*[a-z]\":{\"" VS "\":%f}";
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char *tmp = strtok(buf, ",");
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if (!tmp) {
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return 1;
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}
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return !sscanf(tmp, output, price);
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}
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static size_t write_callback(char *response, size_t s, size_t n, void *buf)
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{
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return snprintf(buf, MIN(s * n, BUF_SIZE), response);
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}
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static char *build_url(void)
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{
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const char base[] =
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"https://api.coingecko.com/api/v3/simple/price?ids=%s&vs_currencies="
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VS;
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size_t ids_size = 0;
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char *url;
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char ids[BUF_SIZE] = {0};
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for (size_t i = 0; WALLET[i].id; i++) {
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strcpy(ids + ids_size, WALLET[i].id);
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ids_size += strlen(WALLET[i].id);
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ids[ids_size++] = ',';
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}
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ids[ids_size - 1] = '\0';
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url = malloc(sizeof base + ids_size * (sizeof *url));
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if (!url) {
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return NULL;
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}
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sprintf(url, base, ids);
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return url;
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}
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static int perform_request(char *response)
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{
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char *url = build_url();
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CURL *curl = curl_easy_init();
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if (!url || !curl) {
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free(url);
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curl_easy_cleanup(curl);
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return 1;
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}
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curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_callback);
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curl_easy_setopt(curl, CURLOPT_WRITEDATA, response);
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curl_easy_setopt(curl, CURLOPT_URL, url);
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curl_easy_perform(curl);
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curl_easy_cleanup(curl);
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free(url);
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return 0;
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}
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int main(void)
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{
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char response[BUF_SIZE];
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int err = perform_request(response);
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float price;
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if (err) {
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error(1, errno, "cannot init curl");
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}
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err = get_next_symbol(response + 1, &price);
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for (size_t i = 0; !err && WALLET[i].id; i++) {
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if (i) {
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printf(" ");
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}
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printf(FMT, WALLET[i].fmt, price);
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err = get_next_symbol(NULL, &price);
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}
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printf("\n");
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return 0;
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}
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