.gitignore git-rerere and config.mak
[git/git.git] / ident.c
CommitLineData
6aa33f40
LT
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>
adc3dbca 11#include <netdb.h>
6aa33f40 12
e1b10391 13static char git_default_date[50];
6aa33f40 14
e9bacb4f
JH
15static 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
6aa33f40
LT
49int 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") */
e1b10391 58 copy_gecos(pw, git_default_name, sizeof(git_default_name));
6aa33f40
LT
59
60 /* Make up a fake email address (name + '@' + hostname [+ '.' + domainname]) */
61 len = strlen(pw->pw_name);
e1b10391 62 if (len > sizeof(git_default_email)/2)
7a868a84 63 die("Your sysadmin must hate you!");
e1b10391
LT
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, '.')) {
adc3dbca
PB
68 struct hostent *he = gethostbyname(git_default_email + len);
69 char *domainname;
70
e1b10391
LT
71 len = strlen(git_default_email);
72 git_default_email[len++] = '.';
adc3dbca
PB
73 if (he && (domainname = strchr(he->h_name, '.')))
74 strncpy(git_default_email + len, domainname + 1, sizeof(git_default_email) - len);
75 else
76 strncpy(git_default_email + len, "(none)", sizeof(git_default_email) - len);
77 git_default_email[sizeof(git_default_email) - 1] = 0;
6aa33f40 78 }
6aa33f40 79 /* And set the default date */
e1b10391 80 datestamp(git_default_date, sizeof(git_default_date));
6aa33f40
LT
81 return 0;
82}
83
84static int add_raw(char *buf, int size, int offset, const char *str)
85{
86 int len = strlen(str);
87 if (offset + len > size)
88 return size;
89 memcpy(buf + offset, str, len);
90 return offset + len;
91}
92
93static int crud(unsigned char c)
94{
fb2af037
JR
95 static char crud_array[256];
96 static int crud_array_initialized = 0;
97
98 if (!crud_array_initialized) {
99 int k;
100
101 for (k = 0; k <= 31; ++k) crud_array[k] = 1;
102 crud_array[' '] = 1;
103 crud_array['.'] = 1;
104 crud_array[','] = 1;
105 crud_array[':'] = 1;
106 crud_array[';'] = 1;
107 crud_array['<'] = 1;
108 crud_array['>'] = 1;
109 crud_array['"'] = 1;
110 crud_array['\''] = 1;
111 crud_array_initialized = 1;
112 }
6aa33f40
LT
113 return crud_array[c];
114}
115
116/*
117 * Copy over a string to the destination, but avoid special
118 * characters ('\n', '<' and '>') and remove crud at the end
119 */
120static int copy(char *buf, int size, int offset, const char *src)
121{
122 int i, len;
123 unsigned char c;
124
125 /* Remove crud from the beginning.. */
126 while ((c = *src) != 0) {
127 if (!crud(c))
128 break;
129 src++;
130 }
131
132 /* Remove crud from the end.. */
133 len = strlen(src);
134 while (len > 0) {
135 c = src[len-1];
136 if (!crud(c))
137 break;
138 --len;
139 }
140
141 /*
142 * Copy the rest to the buffer, but avoid the special
82f9d58a 143 * characters '\n' '<' and '>' that act as delimiters on
6aa33f40
LT
144 * a identification line
145 */
146 for (i = 0; i < len; i++) {
147 c = *src++;
148 switch (c) {
149 case '\n': case '<': case '>':
150 continue;
151 }
152 if (offset >= size)
153 return size;
154 buf[offset++] = c;
155 }
156 return offset;
157}
158
c7d77dab
JH
159static const char *get_ident(const char *name, const char *email,
160 const char *date_str)
6aa33f40
LT
161{
162 static char buffer[1000];
163 char date[50];
164 int i;
165
166 if (!name)
e1b10391 167 name = git_default_name;
6aa33f40 168 if (!email)
e1b10391
LT
169 email = git_default_email;
170 strcpy(date, git_default_date);
6aa33f40
LT
171 if (date_str)
172 parse_date(date_str, date, sizeof(date));
173
174 i = copy(buffer, sizeof(buffer), 0, name);
175 i = add_raw(buffer, sizeof(buffer), i, " <");
176 i = copy(buffer, sizeof(buffer), i, email);
177 i = add_raw(buffer, sizeof(buffer), i, "> ");
178 i = copy(buffer, sizeof(buffer), i, date);
179 if (i >= sizeof(buffer))
180 die("Impossibly long personal identifier");
181 buffer[i] = 0;
182 return buffer;
183}
d289d136 184
c7d77dab 185const char *git_author_info(void)
d289d136 186{
c7d77dab
JH
187 return get_ident(getenv("GIT_AUTHOR_NAME"),
188 getenv("GIT_AUTHOR_EMAIL"),
189 getenv("GIT_AUTHOR_DATE"));
d289d136
EB
190}
191
c7d77dab 192const char *git_committer_info(void)
d289d136 193{
c7d77dab
JH
194 return get_ident(getenv("GIT_COMMITTER_NAME"),
195 getenv("GIT_COMMITTER_EMAIL"),
196 getenv("GIT_COMMITTER_DATE"));
d289d136 197}