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