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Commit | Line | Data |
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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> | |
11 | #include <time.h> | |
12 | #include <ctype.h> | |
13 | ||
14 | static char real_email[1000]; | |
15 | static char real_name[1000]; | |
16 | static char real_date[50]; | |
17 | ||
18 | int setup_ident(void) | |
19 | { | |
20 | int len; | |
21 | struct passwd *pw = getpwuid(getuid()); | |
22 | ||
23 | if (!pw) | |
24 | die("You don't exist. Go away!"); | |
25 | ||
26 | /* Get the name ("gecos") */ | |
27 | len = strlen(pw->pw_gecos); | |
28 | if (len >= sizeof(real_name)) | |
29 | die("Your parents must have hated you"); | |
30 | memcpy(real_name, pw->pw_gecos, len+1); | |
31 | ||
32 | /* Make up a fake email address (name + '@' + hostname [+ '.' + domainname]) */ | |
33 | len = strlen(pw->pw_name); | |
34 | if (len > sizeof(real_email)/2) | |
35 | die("Your parents must have hated you"); | |
36 | memcpy(real_email, pw->pw_name, len); | |
37 | real_email[len++] = '@'; | |
38 | gethostname(real_email + len, sizeof(real_email) - len); | |
39 | if (!strchr(real_email+len, '.')) { | |
40 | len = strlen(real_email); | |
41 | real_email[len++] = '.'; | |
42 | getdomainname(real_email+len, sizeof(real_email)-len); | |
43 | } | |
44 | ||
45 | /* And set the default date */ | |
46 | datestamp(real_date, sizeof(real_date)); | |
47 | return 0; | |
48 | } | |
49 | ||
50 | static int add_raw(char *buf, int size, int offset, const char *str) | |
51 | { | |
52 | int len = strlen(str); | |
53 | if (offset + len > size) | |
54 | return size; | |
55 | memcpy(buf + offset, str, len); | |
56 | return offset + len; | |
57 | } | |
58 | ||
59 | static int crud(unsigned char c) | |
60 | { | |
61 | static const char crud_array[256] = { | |
62 | [0 ... 31] = 1, | |
63 | [' '] = 1, | |
64 | ['.'] = 1, [','] = 1, | |
65 | [':'] = 1, [';'] = 1, | |
66 | ['<'] = 1, ['>'] = 1, | |
67 | ['"'] = 1, ['\''] = 1, | |
68 | }; | |
69 | return crud_array[c]; | |
70 | } | |
71 | ||
72 | /* | |
73 | * Copy over a string to the destination, but avoid special | |
74 | * characters ('\n', '<' and '>') and remove crud at the end | |
75 | */ | |
76 | static int copy(char *buf, int size, int offset, const char *src) | |
77 | { | |
78 | int i, len; | |
79 | unsigned char c; | |
80 | ||
81 | /* Remove crud from the beginning.. */ | |
82 | while ((c = *src) != 0) { | |
83 | if (!crud(c)) | |
84 | break; | |
85 | src++; | |
86 | } | |
87 | ||
88 | /* Remove crud from the end.. */ | |
89 | len = strlen(src); | |
90 | while (len > 0) { | |
91 | c = src[len-1]; | |
92 | if (!crud(c)) | |
93 | break; | |
94 | --len; | |
95 | } | |
96 | ||
97 | /* | |
98 | * Copy the rest to the buffer, but avoid the special | |
99 | * characters '\n' '<' and '>' that act as delimeters on | |
100 | * a identification line | |
101 | */ | |
102 | for (i = 0; i < len; i++) { | |
103 | c = *src++; | |
104 | switch (c) { | |
105 | case '\n': case '<': case '>': | |
106 | continue; | |
107 | } | |
108 | if (offset >= size) | |
109 | return size; | |
110 | buf[offset++] = c; | |
111 | } | |
112 | return offset; | |
113 | } | |
114 | ||
115 | char *get_ident(const char *name, const char *email, const char *date_str) | |
116 | { | |
117 | static char buffer[1000]; | |
118 | char date[50]; | |
119 | int i; | |
120 | ||
121 | if (!name) | |
122 | name = real_name; | |
123 | if (!email) | |
124 | email = real_email; | |
125 | strcpy(date, real_date); | |
126 | if (date_str) | |
127 | parse_date(date_str, date, sizeof(date)); | |
128 | ||
129 | i = copy(buffer, sizeof(buffer), 0, name); | |
130 | i = add_raw(buffer, sizeof(buffer), i, " <"); | |
131 | i = copy(buffer, sizeof(buffer), i, email); | |
132 | i = add_raw(buffer, sizeof(buffer), i, "> "); | |
133 | i = copy(buffer, sizeof(buffer), i, date); | |
134 | if (i >= sizeof(buffer)) | |
135 | die("Impossibly long personal identifier"); | |
136 | buffer[i] = 0; | |
137 | return buffer; | |
138 | } |