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