1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
|
/*
* Copyright (c) 2009-2016 Petri Lehtinen <petri@digip.org>
*
* Jansson is free software; you can redistribute it and/or modify
* it under the terms of the MIT license. See LICENSE for details.
*/
#include <stdlib.h>
#include <string.h>
#include <curl/curl.h>
#include <jansson.h>
#define BUFFER_SIZE (256 * 1024) /* 256 KB */
#define URL_FORMAT "https://api.github.com/repos/%s/%s/commits"
#define URL_SIZE 256
/* Return the offset of the first newline in text or the length of
text if there's no newline */
static int newline_offset(const char *text) {
const char *newline = strchr(text, '\n');
if (!newline)
return strlen(text);
else
return (int)(newline - text);
}
struct write_result {
char *data;
int pos;
};
static size_t write_response(void *ptr, size_t size, size_t nmemb, void *stream) {
struct write_result *result = (struct write_result *)stream;
if (result->pos + size * nmemb >= BUFFER_SIZE - 1) {
fprintf(stderr, "error: too small buffer\n");
return 0;
}
memcpy(result->data + result->pos, ptr, size * nmemb);
result->pos += size * nmemb;
return size * nmemb;
}
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]);
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));
json_decref(root);
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;
}
|
