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 }