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 real_email[1000];
  15 static char real_name[1000];
  16 static char real_date[50];
  17
  18 static void copy_gecos(struct passwd *w, char *name, int sz)
  19 {
  20         char *src, *dst;
  21         int len, nlen;
  22
  23         nlen = strlen(w->pw_name);
  24
  25         /* Traditionally GECOS field had office phone numbers etc, separated
  26          * with commas.  Also & stands for capitalized form of the login name.
  27          */
  28
  29         for (len = 0, dst = name, src = w->pw_gecos; len < sz; src++) {
  30                 int ch = *src;
  31                 if (ch != '&') {
  32                         *dst++ = ch;
  33                         if (ch == 0 || ch == ',')
  34                                 break;
  35                         len++;
  36                         continue;
  37                 }
  38                 if (len + nlen < sz) {
  39                         /* Sorry, Mr. McDonald... */
  40                         *dst++ = toupper(*w->pw_name);
  41                         memcpy(dst, w->pw_name + 1, nlen - 1);
  42                         dst += nlen - 1;
  43                 }
  44         }
  45         if (len < sz)
  46                 name[len] = 0;
  47         else
  48                 die("Your parents must have hated you!");
  49
  50 }
  51
  52 int setup_ident(void)
  53 {
  54         int len;
  55         struct passwd *pw = getpwuid(getuid());
  56
  57         if (!pw)
  58                 die("You don't exist. Go away!");
  59
  60         /* Get the name ("gecos") */
  61         copy_gecos(pw, real_name, sizeof(real_name));
  62
  63         /* Make up a fake email address (name + '@' + hostname [+ '.' + domainname]) */
  64         len = strlen(pw->pw_name);
  65         if (len > sizeof(real_email)/2)
  66                 die("Your sysadmin must hate you!");
  67         memcpy(real_email, pw->pw_name, len);
  68         real_email[len++] = '@';
  69         gethostname(real_email + len, sizeof(real_email) - len);
  70         if (!strchr(real_email+len, '.')) {
  71                 len = strlen(real_email);
  72                 real_email[len++] = '.';
  73                 getdomainname(real_email+len, sizeof(real_email)-len);
  74         }
  75         /* And set the default date */
  76         datestamp(real_date, sizeof(real_date));
  77         return 0;
  78 }
  79
  80 static int add_raw(char *buf, int size, int offset, const char *str)
  81 {
  82         int len = strlen(str);
  83         if (offset + len > size)
  84                 return size;
  85         memcpy(buf + offset, str, len);
  86         return offset + len;
  87 }
  88
  89 static int crud(unsigned char c)
  90 {
  91         static char crud_array[256];
  92         static int crud_array_initialized = 0;
  93
  94         if (!crud_array_initialized) {
  95                 int k;
  96
  97                 for (k = 0; k <= 31; ++k) crud_array[k] = 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['"'] = 1;
 106                 crud_array['\''] = 1;
 107                 crud_array_initialized = 1;
 108         }
 109         return crud_array[c];
 110 }
 111
 112 /*
 113  * Copy over a string to the destination, but avoid special
 114  * characters ('\n', '<' and '>') and remove crud at the end
 115  */
 116 static int copy(char *buf, int size, int offset, const char *src)
 117 {
 118         int i, len;
 119         unsigned char c;
 120
 121         /* Remove crud from the beginning.. */
 122         while ((c = *src) != 0) {
 123                 if (!crud(c))
 124                         break;
 125                 src++;
 126         }
 127
 128         /* Remove crud from the end.. */
 129         len = strlen(src);
 130         while (len > 0) {
 131                 c = src[len-1];
 132                 if (!crud(c))
 133                         break;
 134                 --len;
 135         }
 136
 137         /*
 138          * Copy the rest to the buffer, but avoid the special
 139          * characters '\n' '<' and '>' that act as delimeters on
 140          * a identification line
 141          */
 142         for (i = 0; i < len; i++) {
 143                 c = *src++;
 144                 switch (c) {
 145                 case '\n': case '<': case '>':
 146                         continue;
 147                 }
 148                 if (offset >= size)
 149                         return size;
 150                 buf[offset++] = c;
 151         }
 152         return offset;
 153 }
 154
 155 char *get_ident(const char *name, const char *email, const char *date_str)
 156 {
 157         static char buffer[1000];
 158         char date[50];
 159         int i;
 160
 161         if (!name)
 162                 name = real_name;
 163         if (!email)
 164                 email = real_email;
 165         strcpy(date, real_date);
 166         if (date_str)
 167                 parse_date(date_str, date, sizeof(date));
 168
 169         i = copy(buffer, sizeof(buffer), 0, name);
 170         i = add_raw(buffer, sizeof(buffer), i, " <");
 171         i = copy(buffer, sizeof(buffer), i, email);
 172         i = add_raw(buffer, sizeof(buffer), i, "> ");
 173         i = copy(buffer, sizeof(buffer), i, date);
 174         if (i >= sizeof(buffer))
 175                 die("Impossibly long personal identifier");
 176         buffer[i] = 0;
 177         return buffer;
 178 }
 179
 180 char *git_author_info(void)
 181 {
 182         return get_ident(getenv("GIT_AUTHOR_NAME"), getenv("GIT_AUTHOR_EMAIL"), getenv("GIT_AUTHOR_DATE"));
 183 }
 184
 185 char *git_committer_info(void)
 186 {
 187         return get_ident(getenv("GIT_COMMITTER_NAME"), getenv("GIT_COMMITTER_EMAIL"), getenv("GIT_COMMITTER_DATE"));
 188 }