summaryrefslogtreecommitdiff
path: root/ident.c
blob: 7e917f74de234fd827658805537bc268c34adca6 (plain)
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
/*
 * ident.c
 *
 * create git identifier lines of the form "name <email> date"
 *
 * Copyright (C) 2005 Linus Torvalds
 */
#include "cache.h"
 
#include <pwd.h>
#include <time.h>
#include <ctype.h>
 
static char real_email[1000];
static char real_name[1000];
static char real_date[50];
 
int setup_ident(void)
{
	int len;
	struct passwd *pw = getpwuid(getuid());
 
	if (!pw)
		die("You don't exist. Go away!");
 
	/* Get the name ("gecos") */
	len = strlen(pw->pw_gecos);
	if (len >= sizeof(real_name))
		die("Your parents must have hated you!");
	memcpy(real_name, pw->pw_gecos, len+1);
 
	/* Make up a fake email address (name + '@' + hostname [+ '.' + domainname]) */
	len = strlen(pw->pw_name);
	if (len > sizeof(real_email)/2)
		die("Your sysadmin must hate you!");
	memcpy(real_email, pw->pw_name, len);
	real_email[len++] = '@';
	gethostname(real_email + len, sizeof(real_email) - len);
#ifndef NO_GETDOMAINNAME
	if (!strchr(real_email+len, '.')) {
		len = strlen(real_email);
		real_email[len++] = '.';
		getdomainname(real_email+len, sizeof(real_email)-len);
	}
#endif
	/* And set the default date */
	datestamp(real_date, sizeof(real_date));
	return 0;
}
 
static int add_raw(char *buf, int size, int offset, const char *str)
{
	int len = strlen(str);
	if (offset + len > size)
		return size;
	memcpy(buf + offset, str, len);
	return offset + len;
}
 
static int crud(unsigned char c)
{
	static char crud_array[256];
	static int crud_array_initialized = 0;
 
	if (!crud_array_initialized) {
		int k;
 
		for (k = 0; k <= 31; ++k) crud_array[k] = 1;
		crud_array[' '] = 1;
		crud_array['.'] = 1;
		crud_array[','] = 1;
		crud_array[':'] = 1;
		crud_array[';'] = 1;
		crud_array['<'] = 1;
		crud_array['>'] = 1;
		crud_array['"'] = 1;
		crud_array['\''] = 1;
		crud_array_initialized = 1;
	}
	return crud_array[c];
}
 
/*
 * Copy over a string to the destination, but avoid special
 * characters ('\n', '<' and '>') and remove crud at the end
 */
static int copy(char *buf, int size, int offset, const char *src)
{
	int i, len;
	unsigned char c;
 
	/* Remove crud from the beginning.. */
	while ((c = *src) != 0) {
		if (!crud(c))
			break;
		src++;
	}
 
	/* Remove crud from the end.. */
	len = strlen(src);
	while (len > 0) {
		c = src[len-1];
		if (!crud(c))
			break;
		--len;
	}
 
	/*
	 * Copy the rest to the buffer, but avoid the special
	 * characters '\n' '<' and '>' that act as delimeters on
	 * a identification line
	 */
	for (i = 0; i < len; i++) {
		c = *src++;
		switch (c) {
		case '\n': case '<': case '>':
			continue;
		}
		if (offset >= size)
			return size;
		buf[offset++] = c;
	}
	return offset;
}
 
char *get_ident(const char *name, const char *email, const char *date_str)
{
	static char buffer[1000];
	char date[50];
	int i;
 
	if (!name)
		name = real_name;
	if (!email)
		email = real_email;
	strcpy(date, real_date);
	if (date_str)
		parse_date(date_str, date, sizeof(date));
 
	i = copy(buffer, sizeof(buffer), 0, name);
	i = add_raw(buffer, sizeof(buffer), i, " <");
	i = copy(buffer, sizeof(buffer), i, email);
	i = add_raw(buffer, sizeof(buffer), i, "> ");
	i = copy(buffer, sizeof(buffer), i, date);
	if (i >= sizeof(buffer))
		die("Impossibly long personal identifier");
	buffer[i] = 0;
	return buffer;
}
 
char *git_author_info(void)
{
	return get_ident(gitenv("GIT_AUTHOR_NAME"), gitenv("GIT_AUTHOR_EMAIL"), gitenv("GIT_AUTHOR_DATE"));
}
 
char *git_committer_info(void)
{
	return get_ident(gitenv("GIT_COMMITTER_NAME"), gitenv("GIT_COMMITTER_EMAIL"), gitenv("GIT_COMMITTER_DATE"));
}