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 #include <ctype.h>
  13
  14 static char git_default_date[50];
  15
  16 static void copy_gecos(struct passwd *w, char *name, int sz)
  17 {
  18         char *src, *dst;
  19         int len, nlen;
  20
  21         nlen = strlen(w->pw_name);
  22
  23         /* Traditionally GECOS field had office phone numbers etc, separated
  24          * with commas.  Also & stands for capitalized form of the login name.
  25          */
  26
  27         for (len = 0, dst = name, src = w->pw_gecos; len < sz; src++) {
  28                 int ch = *src;
  29                 if (ch != '&') {
  30                         *dst++ = ch;
  31                         if (ch == 0 || ch == ',')
  32                                 break;
  33                         len++;
  34                         continue;
  35                 }
  36                 if (len + nlen < sz) {
  37                         /* Sorry, Mr. McDonald... */
  38                         *dst++ = toupper(*w->pw_name);
  39                         memcpy(dst, w->pw_name + 1, nlen - 1);
  40                         dst += nlen - 1;
  41                 }
  42         }
  43         if (len < sz)
  44                 name[len] = 0;
  45         else
  46                 die("Your parents must have hated you!");
  47
  48 }
  49
  50 int setup_ident(void)
  51 {
  52         int len;
  53         struct passwd *pw = getpwuid(getuid());
  54
  55         if (!pw)
  56                 die("You don't exist. Go away!");
  57
  58         /* Get the name ("gecos") */
  59         copy_gecos(pw, git_default_name, sizeof(git_default_name));
  60
  61         /* Make up a fake email address (name + '@' + hostname [+ '.' + domainname]) */
  62         len = strlen(pw->pw_name);
  63         if (len > sizeof(git_default_email)/2)
  64                 die("Your sysadmin must hate you!");
  65         memcpy(git_default_email, pw->pw_name, len);
  66         git_default_email[len++] = '@';
  67         gethostname(git_default_email + len, sizeof(git_default_email) - len);
  68         if (!strchr(git_default_email+len, '.')) {
  69                 len = strlen(git_default_email);
  70                 git_default_email[len++] = '.';
  71                 getdomainname(git_default_email+len, sizeof(git_default_email)-len);
  72         }
  73         /* And set the default date */
  74         datestamp(git_default_date, sizeof(git_default_date));
  75         return 0;
  76 }
  77
  78 static int add_raw(char *buf, int size, int offset, const char *str)
  79 {
  80         int len = strlen(str);
  81         if (offset + len > size)
  82                 return size;
  83         memcpy(buf + offset, str, len);
  84         return offset + len;
  85 }
  86
  87 static int crud(unsigned char c)
  88 {
  89         static char crud_array[256];
  90         static int crud_array_initialized = 0;
  91
  92         if (!crud_array_initialized) {
  93                 int k;
  94
  95                 for (k = 0; k <= 31; ++k) crud_array[k] = 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['\''] = 1;
 105                 crud_array_initialized = 1;
 106         }
 107         return crud_array[c];
 108 }
 109
 110 /*
 111  * Copy over a string to the destination, but avoid special
 112  * characters ('\n', '<' and '>') and remove crud at the end
 113  */
 114 static int copy(char *buf, int size, int offset, const char *src)
 115 {
 116         int i, len;
 117         unsigned char c;
 118
 119         /* Remove crud from the beginning.. */
 120         while ((c = *src) != 0) {
 121                 if (!crud(c))
 122                         break;
 123                 src++;
 124         }
 125
 126         /* Remove crud from the end.. */
 127         len = strlen(src);
 128         while (len > 0) {
 129                 c = src[len-1];
 130                 if (!crud(c))
 131                         break;
 132                 --len;
 133         }
 134
 135         /*
 136          * Copy the rest to the buffer, but avoid the special
 137          * characters '\n' '<' and '>' that act as delimeters on
 138          * a identification line
 139          */
 140         for (i = 0; i < len; i++) {
 141                 c = *src++;
 142                 switch (c) {
 143                 case '\n': case '<': case '>':
 144                         continue;
 145                 }
 146                 if (offset >= size)
 147                         return size;
 148                 buf[offset++] = c;
 149         }
 150         return offset;
 151 }
 152
 153 char *get_ident(const char *name, const char *email, const char *date_str)
 154 {
 155         static char buffer[1000];
 156         char date[50];
 157         int i;
 158
 159         if (!name)
 160                 name = git_default_name;
 161         if (!email)
 162                 email = git_default_email;
 163         strcpy(date, git_default_date);
 164         if (date_str)
 165                 parse_date(date_str, date, sizeof(date));
 166
 167         i = copy(buffer, sizeof(buffer), 0, name);
 168         i = add_raw(buffer, sizeof(buffer), i, " <");
 169         i = copy(buffer, sizeof(buffer), i, email);
 170         i = add_raw(buffer, sizeof(buffer), i, "> ");
 171         i = copy(buffer, sizeof(buffer), i, date);
 172         if (i >= sizeof(buffer))
 173                 die("Impossibly long personal identifier");
 174         buffer[i] = 0;
 175         return buffer;
 176 }
 177
 178 char *git_author_info(void)
 179 {
 180         return get_ident(getenv("GIT_AUTHOR_NAME"), getenv("GIT_AUTHOR_EMAIL"), getenv("GIT_AUTHOR_DATE"));
 181 }
 182
 183 char *git_committer_info(void)
 184 {
 185         return get_ident(getenv("GIT_COMMITTER_NAME"), getenv("GIT_COMMITTER_EMAIL"), getenv("GIT_COMMITTER_DATE"));
 186 }