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/*
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* Copyright (c) 2009-2014 Petri Lehtinen <[email protected]>
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*
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* Jansson is free software; you can redistribute it and/or modify
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* it under the terms of the MIT license. See LICENSE for details.
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <jansson.h>
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#include <curl/curl.h>
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#define BUFFER_SIZE (256 * 1024) /* 256 KB */
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#define URL_FORMAT "https://api.github.com/repos/%s/%s/commits"
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#define URL_SIZE 256
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/* Return the offset of the first newline in text or the length of
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text if there's no newline */
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static int newline_offset(const char *text)
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{
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const char *newline = strchr(text, '\n');
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if(!newline)
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return strlen(text);
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else
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return (int)(newline - text);
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}
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struct write_result
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{
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char *data;
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int pos;
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};
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static size_t write_response(void *ptr, size_t size, size_t nmemb, void *stream)
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{
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struct write_result *result = (struct write_result *)stream;
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if(result->pos + size * nmemb >= BUFFER_SIZE - 1)
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{
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fprintf(stderr, "error: too small buffer\n");
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return 0;
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}
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memcpy(result->data + result->pos, ptr, size * nmemb);
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result->pos += size * nmemb;
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return size * nmemb;
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}
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static char *request(const char *url)
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{
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CURL *curl = NULL;
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CURLcode status;
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struct curl_slist *headers = NULL;
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char *data = NULL;
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long code;
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curl_global_init(CURL_GLOBAL_ALL);
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curl = curl_easy_init();
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if(!curl)
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goto error;
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data = malloc(BUFFER_SIZE);
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if(!data)
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goto error;
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struct write_result write_result = {
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.data = data,
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.pos = 0
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};
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curl_easy_setopt(curl, CURLOPT_URL, url);
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/* GitHub commits API v3 requires a User-Agent header */
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headers = curl_slist_append(headers, "User-Agent: Jansson-Tutorial");
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curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);
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curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_response);
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curl_easy_setopt(curl, CURLOPT_WRITEDATA, &write_result);
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status = curl_easy_perform(curl);
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if(status != 0)
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{
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fprintf(stderr, "error: unable to request data from %s:\n", url);
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fprintf(stderr, "%s\n", curl_easy_strerror(status));
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goto error;
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}
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curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &code);
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if(code != 200)
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{
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fprintf(stderr, "error: server responded with code %ld\n", code);
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goto error;
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}
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curl_easy_cleanup(curl);
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curl_slist_free_all(headers);
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curl_global_cleanup();
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/* zero-terminate the result */
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data[write_result.pos] = '\0';
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return data;
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error:
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if(data)
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free(data);
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if(curl)
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curl_easy_cleanup(curl);
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if(headers)
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curl_slist_free_all(headers);
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curl_global_cleanup();
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return NULL;
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}
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int main(int argc, char *argv[])
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{
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size_t i;
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char *text;
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char url[URL_SIZE];
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json_t *root;
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json_error_t error;
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if(argc != 3)
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{
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fprintf(stderr, "usage: %s USER REPOSITORY\n\n", argv[0]);
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fprintf(stderr, "List commits at USER's REPOSITORY.\n\n");
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return 2;
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}
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snprintf(url, URL_SIZE, URL_FORMAT, argv[1], argv[2]);
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text = request(url);
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if(!text)
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return 1;
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root = json_loads(text, 0, &error);
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free(text);
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if(!root)
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{
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fprintf(stderr, "error: on line %d: %s\n", error.line, error.text);
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return 1;
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}
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if(!json_is_array(root))
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{
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fprintf(stderr, "error: root is not an array\n");
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json_decref(root);
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return 1;
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}
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for(i = 0; i < json_array_size(root); i++)
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{
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json_t *data, *sha, *commit, *message;
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const char *message_text;
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data = json_array_get(root, i);
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if(!json_is_object(data))
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{
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fprintf(stderr, "error: commit data %d is not an object\n", (int)(i + 1));
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json_decref(root);
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return 1;
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}
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sha = json_object_get(data, "sha");
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if(!json_is_string(sha))
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{
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fprintf(stderr, "error: commit %d: sha is not a string\n", (int)(i + 1));
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return 1;
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}
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commit = json_object_get(data, "commit");
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if(!json_is_object(commit))
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{
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fprintf(stderr, "error: commit %d: commit is not an object\n", (int)(i + 1));
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json_decref(root);
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return 1;
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}
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message = json_object_get(commit, "message");
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if(!json_is_string(message))
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{
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fprintf(stderr, "error: commit %d: message is not a string\n", (int)(i + 1));
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json_decref(root);
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return 1;
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}
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message_text = json_string_value(message);
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printf("%.8s %.*s\n",
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json_string_value(sha),
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newline_offset(message_text),
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message_text);
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}
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json_decref(root);
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return 0;
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}
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