562f5f18160166506e99aa4f6b5b417cbdc847d8
   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
  14static char real_email[1000];
  15static char real_name[1000];
  16static char real_date[50];
  17
  18static 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
  52int 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
  80static 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
  89static 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 */
 116static 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
 155char *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
 180char *git_author_info(void)
 181{
 182        return get_ident(getenv("GIT_AUTHOR_NAME"), getenv("GIT_AUTHOR_EMAIL"), getenv("GIT_AUTHOR_DATE"));
 183}
 184
 185char *git_committer_info(void)
 186{
 187        return get_ident(getenv("GIT_COMMITTER_NAME"), getenv("GIT_COMMITTER_EMAIL"), getenv("GIT_COMMITTER_DATE"));
 188}