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 #ifndef NO_GETDOMAINNAME
  40         if (!strchr(real_email+len, '.')) {
  41                 len = strlen(real_email);
  42                 real_email[len++] = '.';
  43                 getdomainname(real_email+len, sizeof(real_email)-len);
  44         }
  45 #endif
  46         /* And set the default date */
  47         datestamp(real_date, sizeof(real_date));
  48         return 0;
  49 }
  50
  51 static int add_raw(char *buf, int size, int offset, const char *str)
  52 {
  53         int len = strlen(str);
  54         if (offset + len > size)
  55                 return size;
  56         memcpy(buf + offset, str, len);
  57         return offset + len;
  58 }
  59
  60 static int crud(unsigned char c)
  61 {
  62         static char crud_array[256];
  63         static int crud_array_initialized = 0;
  64
  65         if (!crud_array_initialized) {
  66                 int k;
  67
  68                 for (k = 0; k <= 31; ++k) crud_array[k] = 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['\''] = 1;
  78                 crud_array_initialized = 1;
  79         }
  80         return crud_array[c];
  81 }
  82
  83 /*
  84  * Copy over a string to the destination, but avoid special
  85  * characters ('\n', '<' and '>') and remove crud at the end
  86  */
  87 static int copy(char *buf, int size, int offset, const char *src)
  88 {
  89         int i, len;
  90         unsigned char c;
  91
  92         /* Remove crud from the beginning.. */
  93         while ((c = *src) != 0) {
  94                 if (!crud(c))
  95                         break;
  96                 src++;
  97         }
  98
  99         /* Remove crud from the end.. */
 100         len = strlen(src);
 101         while (len > 0) {
 102                 c = src[len-1];
 103                 if (!crud(c))
 104                         break;
 105                 --len;
 106         }
 107
 108         /*
 109          * Copy the rest to the buffer, but avoid the special
 110          * characters '\n' '<' and '>' that act as delimeters on
 111          * a identification line
 112          */
 113         for (i = 0; i < len; i++) {
 114                 c = *src++;
 115                 switch (c) {
 116                 case '\n': case '<': case '>':
 117                         continue;
 118                 }
 119                 if (offset >= size)
 120                         return size;
 121                 buf[offset++] = c;
 122         }
 123         return offset;
 124 }
 125
 126 char *get_ident(const char *name, const char *email, const char *date_str)
 127 {
 128         static char buffer[1000];
 129         char date[50];
 130         int i;
 131
 132         if (!name)
 133                 name = real_name;
 134         if (!email)
 135                 email = real_email;
 136         strcpy(date, real_date);
 137         if (date_str)
 138                 parse_date(date_str, date, sizeof(date));
 139
 140         i = copy(buffer, sizeof(buffer), 0, name);
 141         i = add_raw(buffer, sizeof(buffer), i, " <");
 142         i = copy(buffer, sizeof(buffer), i, email);
 143         i = add_raw(buffer, sizeof(buffer), i, "> ");
 144         i = copy(buffer, sizeof(buffer), i, date);
 145         if (i >= sizeof(buffer))
 146                 die("Impossibly long personal identifier");
 147         buffer[i] = 0;
 148         return buffer;
 149 }
 150
 151 char *git_author_info(void)
 152 {
 153         return get_ident(getenv("GIT_AUTHOR_NAME"), getenv("GIT_AUTHOR_EMAIL"), getenv("GIT_AUTHOR_DATE"));
 154 }
 155
 156 char *git_committer_info(void)
 157 {
 158         return get_ident(getenv("GIT_COMMITTER_NAME"), getenv("GIT_COMMITTER_EMAIL"), getenv("GIT_COMMITTER_DATE"));
 159 }