1bfbc6ff350baf61c15debf5bba45c0669ec107d
[git/git.git] / ident.c
1 /*
2 * ident.c
3 *
4 * create git identifier lines of the form "name <email> date"
5 *
6 * Copyright (C) 2005 Linus Torvalds
7 */
8 #include "cache.h"
9
10 #include <pwd.h>
11 #include <time.h>
12
13 static char git_default_date[50];
14
15 static void copy_gecos(struct passwd *w, char *name, int sz)
16 {
17 char *src, *dst;
18 int len, nlen;
19
20 nlen = strlen(w->pw_name);
21
22 /* Traditionally GECOS field had office phone numbers etc, separated
23 * with commas. Also & stands for capitalized form of the login name.
24 */
25
26 for (len = 0, dst = name, src = w->pw_gecos; len < sz; src++) {
27 int ch = *src;
28 if (ch != '&') {
29 *dst++ = ch;
30 if (ch == 0 || ch == ',')
31 break;
32 len++;
33 continue;
34 }
35 if (len + nlen < sz) {
36 /* Sorry, Mr. McDonald... */
37 *dst++ = toupper(*w->pw_name);
38 memcpy(dst, w->pw_name + 1, nlen - 1);
39 dst += nlen - 1;
40 }
41 }
42 if (len < sz)
43 name[len] = 0;
44 else
45 die("Your parents must have hated you!");
46
47 }
48
49 int setup_ident(void)
50 {
51 int len;
52 struct passwd *pw = getpwuid(getuid());
53
54 if (!pw)
55 die("You don't exist. Go away!");
56
57 /* Get the name ("gecos") */
58 copy_gecos(pw, git_default_name, sizeof(git_default_name));
59
60 /* Make up a fake email address (name + '@' + hostname [+ '.' + domainname]) */
61 len = strlen(pw->pw_name);
62 if (len > sizeof(git_default_email)/2)
63 die("Your sysadmin must hate you!");
64 memcpy(git_default_email, pw->pw_name, len);
65 git_default_email[len++] = '@';
66 gethostname(git_default_email + len, sizeof(git_default_email) - len);
67 if (!strchr(git_default_email+len, '.')) {
68 len = strlen(git_default_email);
69 git_default_email[len++] = '.';
70 getdomainname(git_default_email+len, sizeof(git_default_email)-len);
71 }
72 /* And set the default date */
73 datestamp(git_default_date, sizeof(git_default_date));
74 return 0;
75 }
76
77 static int add_raw(char *buf, int size, int offset, const char *str)
78 {
79 int len = strlen(str);
80 if (offset + len > size)
81 return size;
82 memcpy(buf + offset, str, len);
83 return offset + len;
84 }
85
86 static int crud(unsigned char c)
87 {
88 static char crud_array[256];
89 static int crud_array_initialized = 0;
90
91 if (!crud_array_initialized) {
92 int k;
93
94 for (k = 0; k <= 31; ++k) crud_array[k] = 1;
95 crud_array[' '] = 1;
96 crud_array['.'] = 1;
97 crud_array[','] = 1;
98 crud_array[':'] = 1;
99 crud_array[';'] = 1;
100 crud_array['<'] = 1;
101 crud_array['>'] = 1;
102 crud_array['"'] = 1;
103 crud_array['\''] = 1;
104 crud_array_initialized = 1;
105 }
106 return crud_array[c];
107 }
108
109 /*
110 * Copy over a string to the destination, but avoid special
111 * characters ('\n', '<' and '>') and remove crud at the end
112 */
113 static int copy(char *buf, int size, int offset, const char *src)
114 {
115 int i, len;
116 unsigned char c;
117
118 /* Remove crud from the beginning.. */
119 while ((c = *src) != 0) {
120 if (!crud(c))
121 break;
122 src++;
123 }
124
125 /* Remove crud from the end.. */
126 len = strlen(src);
127 while (len > 0) {
128 c = src[len-1];
129 if (!crud(c))
130 break;
131 --len;
132 }
133
134 /*
135 * Copy the rest to the buffer, but avoid the special
136 * characters '\n' '<' and '>' that act as delimeters on
137 * a identification line
138 */
139 for (i = 0; i < len; i++) {
140 c = *src++;
141 switch (c) {
142 case '\n': case '<': case '>':
143 continue;
144 }
145 if (offset >= size)
146 return size;
147 buf[offset++] = c;
148 }
149 return offset;
150 }
151
152 char *get_ident(const char *name, const char *email, const char *date_str)
153 {
154 static char buffer[1000];
155 char date[50];
156 int i;
157
158 if (!name)
159 name = git_default_name;
160 if (!email)
161 email = git_default_email;
162 strcpy(date, git_default_date);
163 if (date_str)
164 parse_date(date_str, date, sizeof(date));
165
166 i = copy(buffer, sizeof(buffer), 0, name);
167 i = add_raw(buffer, sizeof(buffer), i, " <");
168 i = copy(buffer, sizeof(buffer), i, email);
169 i = add_raw(buffer, sizeof(buffer), i, "> ");
170 i = copy(buffer, sizeof(buffer), i, date);
171 if (i >= sizeof(buffer))
172 die("Impossibly long personal identifier");
173 buffer[i] = 0;
174 return buffer;
175 }
176
177 char *git_author_info(void)
178 {
179 return get_ident(getenv("GIT_AUTHOR_NAME"), getenv("GIT_AUTHOR_EMAIL"), getenv("GIT_AUTHOR_DATE"));
180 }
181
182 char *git_committer_info(void)
183 {
184 return get_ident(getenv("GIT_COMMITTER_NAME"), getenv("GIT_COMMITTER_EMAIL"), getenv("GIT_COMMITTER_DATE"));
185 }