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 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 sysadmin must hate 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 char crud_array[256];
  62         static int crud_array_initialized = 0;
  63
  64         if (!crud_array_initialized) {
  65                 int k;
  66
  67                 for (k = 0; k <= 31; ++k) crud_array[k] = 1;
  68                 crud_array[' '] = 1;
  69                 crud_array['.'] = 1;
  70                 crud_array[','] = 1;
  71                 crud_array[':'] = 1;
  72                 crud_array[';'] = 1;
  73                 crud_array['<'] = 1;
  74                 crud_array['>'] = 1;
  75                 crud_array['"'] = 1;
  76                 crud_array['\''] = 1;
  77                 crud_array_initialized = 1;
  78         }
  79         return crud_array[c];
  80 }
  81
  82 /*
  83  * Copy over a string to the destination, but avoid special
  84  * characters ('\n', '<' and '>') and remove crud at the end
  85  */
  86 static int copy(char *buf, int size, int offset, const char *src)
  87 {
  88         int i, len;
  89         unsigned char c;
  90
  91         /* Remove crud from the beginning.. */
  92         while ((c = *src) != 0) {
  93                 if (!crud(c))
  94                         break;
  95                 src++;
  96         }
  97
  98         /* Remove crud from the end.. */
  99         len = strlen(src);
 100         while (len > 0) {
 101                 c = src[len-1];
 102                 if (!crud(c))
 103                         break;
 104                 --len;
 105         }
 106
 107         /*
 108          * Copy the rest to the buffer, but avoid the special
 109          * characters '\n' '<' and '>' that act as delimeters on
 110          * a identification line
 111          */
 112         for (i = 0; i < len; i++) {
 113                 c = *src++;
 114                 switch (c) {
 115                 case '\n': case '<': case '>':
 116                         continue;
 117                 }
 118                 if (offset >= size)
 119                         return size;
 120                 buf[offset++] = c;
 121         }
 122         return offset;
 123 }
 124
 125 char *get_ident(const char *name, const char *email, const char *date_str)
 126 {
 127         static char buffer[1000];
 128         char date[50];
 129         int i;
 130
 131         if (!name)
 132                 name = real_name;
 133         if (!email)
 134                 email = real_email;
 135         strcpy(date, real_date);
 136         if (date_str)
 137                 parse_date(date_str, date, sizeof(date));
 138
 139         i = copy(buffer, sizeof(buffer), 0, name);
 140         i = add_raw(buffer, sizeof(buffer), i, " <");
 141         i = copy(buffer, sizeof(buffer), i, email);
 142         i = add_raw(buffer, sizeof(buffer), i, "> ");
 143         i = copy(buffer, sizeof(buffer), i, date);
 144         if (i >= sizeof(buffer))
 145                 die("Impossibly long personal identifier");
 146         buffer[i] = 0;
 147         return buffer;
 148 }
 149
 150 char *git_author_info(void)
 151 {
 152         return get_ident(gitenv("GIT_AUTHOR_NAME"), gitenv("GIT_AUTHOR_EMAIL"), gitenv("GIT_AUTHOR_DATE"));
 153 }
 154
 155 char *git_committer_info(void)
 156 {
 157         return get_ident(gitenv("GIT_COMMITTER_NAME"), gitenv("GIT_COMMITTER_EMAIL"), gitenv("GIT_COMMITTER_DATE"));
 158 }