static char *request(const char *url)
{
CURL *curl;
CURLcode status;
char *data;
long code;
curl = curl_easy_init();
data = malloc(BUFFER_SIZE);
if(!curl || !data)
return NULL;
struct write_result write_result = {
.data = data,
.pos = 0
};
curl_easy_setopt(curl, CURLOPT_URL, url);
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_response);
curl_easy_setopt(curl, CURLOPT_WRITEDATA, &write_result);
status = curl_easy_perform(curl);
if(status != 0)
{
fprintf(stderr, "error: unable to request data from %s:\n", url);
fprintf(stderr, "%s\n", curl_easy_strerror(status));
return NULL;
}
curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &code);
if(code != 200)
{
fprintf(stderr, "error: server responded with code %ld\n", code);
return NULL;
}
curl_easy_cleanup(curl);
curl_global_cleanup();
/* zero-terminate the result */
data[write_result.pos] = '\0';
return data;
}
int main(int argc, char *argv[])
{
size_t i;
char *text;
char url[URL_SIZE];
json_t *root;
json_error_t error;
json_t *commits;
if(argc != 3)
{
fprintf(stderr, "usage: %s USER REPOSITORY\n\n", argv[0]);
fprintf(stderr, "List commits at USER's REPOSITORY.\n\n");
return 2;
}
snprintf(url, URL_SIZE, URL_FORMAT, argv[1], argv[2]);
text = request(url);
if(!text)
return 1;
root = json_loads(text, 0, &error);
free(text);
if(!root)
{
fprintf(stderr, "error: on line %d: %s\n", error.line, error.text);
return 1;
}
commits = json_object_get(root, "commits");
if(!json_is_array(commits))
{
fprintf(stderr, "error: commits is not an array\n");
return 1;
}
for(i = 0; i < json_array_size(commits); i++)
{
json_t *commit, *id, *message;
const char *message_text;
commit = json_array_get(commits, i);
if(!json_is_object(commit))
{
fprintf(stderr, "error: commit %d is not an object\n", i + 1);
return 1;
}
id = json_object_get(commit, "id");
if(!json_is_string(id))
{
fprintf(stderr, "error: commit %d: id is not a string\n", i + 1);
return 1;
}
message = json_object_get(commit, "message");
if(!json_is_string(message))
{
fprintf(stderr, "error: commit %d: message is not a string\n", i + 1);
return 1;
}
message_text = json_string_value(message);
printf("%.8s %.*s\n",
json_string_value(id),
newline_offset(message_text),
message_text);
}
json_decref(root);
return 0;
}
static char *request(const char *url) {
CURL *curl = NULL;
CURLcode status;
struct curl_slist *headers = NULL;
char *data = NULL;
long code;
curl_global_init(CURL_GLOBAL_ALL);
curl = curl_easy_init();
if (!curl) {
goto error;
}
data = malloc(BUFFER_SIZE);
if (!data) {
goto error;
}
struct write_result write_result = {
.data = data,
.pos = 0
};
curl_easy_setopt(curl, CURLOPT_URL, url);
/* GitHub commits API v3 requires a User-Agent header */
headers = curl_slist_append(headers, "User-Agent: Jansson-Tutorial");
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_response);
curl_easy_setopt(curl, CURLOPT_WRITEDATA, &write_result);
status = curl_easy_perform(curl);
if (status != 0) {
fprintf(stderr, "error: unable to request data from %s:\n", url);
fprintf(stderr, "%s\n", curl_easy_strerror(status));
goto error;
}
curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &code);
if (code != 200) {
fprintf(stderr, "error: server responded with code %ld\n", code);
goto error;
}
curl_easy_cleanup(curl);
curl_slist_free_all(headers);
curl_global_cleanup();
/* zero-terminate the result */
data[write_result.pos] = '\0';
return data;
error:
if (data) {
free(data);
}
if (curl) {
curl_easy_cleanup(curl);
}
if (headers) {
curl_slist_free_all(headers);
}
curl_global_cleanup();
return NULL;
}
int main(int argc, char *argv[]) {
size_t i;
char *text;
char url[URL_SIZE];
json_t *root;
json_error_t error;
if (argc != 3) {
fprintf(stderr, "usage: %s USER REPOSITORY\n\n", argv[0]);
fprintf(stderr, "List commits at USER's REPOSITORY.\n\n");
return 2;
}
snprintf(url, URL_SIZE, URL_FORMAT, argv[1], argv[2]);
printf("Query url: %s\n", url);
text = request(url);
if (!text) {
return 1;
}
root = json_loads(text, 0, &error);
free(text);
if (!root) {
fprintf(stderr, "error: on line %d: %s\n", error.line, error.text);
return 1;
}
if (!json_is_array(root)) {
fprintf(stderr, "error: root is not an array\n");
json_decref(root);
return 1;
}
for (i = 0; i < json_array_size(root); i++) {
json_t *data, *sha, *commit, *message;
const char *message_text;
data = json_array_get(root, i);
if (!json_is_object(data)) {
fprintf(stderr, "error: commit data %d is not an object\n", (int) (i + 1));
json_decref(root);
return 1;
}
sha = json_object_get(data, "sha");
if (!json_is_string(sha)) {
fprintf(stderr, "error: commit %d: sha is not a string\n", (int) (i + 1));
return 1;
}
commit = json_object_get(data, "commit");
if (!json_is_object(commit)) {
fprintf(stderr, "error: commit %d: commit is not an object\n", (int) (i + 1));
json_decref(root);
return 1;
}
message = json_object_get(commit, "message");
if (!json_is_string(message)) {
fprintf(stderr, "error: commit %d: message is not a string\n", (int) (i + 1));
json_decref(root);
return 1;
}
message_text = json_string_value(message);
printf("%.8s %.*s\n",
json_string_value(sha),
newline_offset(message_text),
message_text);
}
json_decref(root);
return 0;
}
