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tag: v1.4.2-rc3
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/*
* ident.c
*
* create git identifier lines of the form "name <email> date"
*
* Copyright (C) 2005 Linus Torvalds
*/
#include "cache.h"

#include <pwd.h>
#include <netdb.h>

static char git_default_date[50];

static void copy_gecos(struct passwd *w, char *name, int sz)
{
char *src, *dst;
int len, nlen;

nlen = strlen(w->pw_name);

/* Traditionally GECOS field had office phone numbers etc, separated
* with commas. Also & stands for capitalized form of the login name.
*/

for (len = 0, dst = name, src = w->pw_gecos; len < sz; src++) {
int ch = *src;
if (ch != '&') {
*dst++ = ch;
if (ch == 0 || ch == ',')
break;
len++;
continue;
}
if (len + nlen < sz) {
/* Sorry, Mr. McDonald... */
*dst++ = toupper(*w->pw_name);
memcpy(dst, w->pw_name + 1, nlen - 1);
dst += nlen - 1;
}
}
if (len < sz)
name[len] = 0;
else
die("Your parents must have hated you!");

}

int setup_ident(void)
{
int len;
struct passwd *pw = getpwuid(getuid());

if (!pw)
die("You don't exist. Go away!");

/* Get the name ("gecos") */
copy_gecos(pw, git_default_name, sizeof(git_default_name));

/* Make up a fake email address (name + '@' + hostname [+ '.' + domainname]) */
len = strlen(pw->pw_name);
if (len > sizeof(git_default_email)/2)
die("Your sysadmin must hate you!");
memcpy(git_default_email, pw->pw_name, len);
git_default_email[len++] = '@';
gethostname(git_default_email + len, sizeof(git_default_email) - len);
if (!strchr(git_default_email+len, '.')) {
struct hostent *he = gethostbyname(git_default_email + len);
char *domainname;

len = strlen(git_default_email);
git_default_email[len++] = '.';
if (he && (domainname = strchr(he->h_name, '.')))
strlcpy(git_default_email + len, domainname + 1, sizeof(git_default_email) - len);
else
strlcpy(git_default_email + len, "(none)", sizeof(git_default_email) - len);
}
/* And set the default date */
datestamp(git_default_date, sizeof(git_default_date));
return 0;
}

static int add_raw(char *buf, int size, int offset, const char *str)
{
int len = strlen(str);
if (offset + len > size)
return size;
memcpy(buf + offset, str, len);
return offset + len;
}

static int crud(unsigned char c)
{
static char crud_array[256];
static int crud_array_initialized = 0;

if (!crud_array_initialized) {
int k;

for (k = 0; k <= 31; ++k) crud_array[k] = 1;
crud_array[' '] = 1;
crud_array['.'] = 1;
crud_array[','] = 1;
crud_array[':'] = 1;
crud_array[';'] = 1;
crud_array['<'] = 1;
crud_array['>'] = 1;
crud_array['"'] = 1;
crud_array['\''] = 1;
crud_array_initialized = 1;
}
return crud_array[c];
}

/*
* Copy over a string to the destination, but avoid special
* characters ('\n', '<' and '>') and remove crud at the end
*/
static int copy(char *buf, int size, int offset, const char *src)
{
int i, len;
unsigned char c;

/* Remove crud from the beginning.. */
while ((c = *src) != 0) {
if (!crud(c))
break;
src++;
}

/* Remove crud from the end.. */
len = strlen(src);
while (len > 0) {
c = src[len-1];
if (!crud(c))
break;
--len;
}

/*
* Copy the rest to the buffer, but avoid the special
* characters '\n' '<' and '>' that act as delimiters on
* a identification line
*/
for (i = 0; i < len; i++) {
c = *src++;
switch (c) {
case '\n': case '<': case '>':
continue;
}
if (offset >= size)
return size;
buf[offset++] = c;
}
return offset;
}

static const char au_env[] = "GIT_AUTHOR_NAME";
static const char co_env[] = "GIT_COMMITTER_NAME";
static const char *env_hint =
"\n*** Environment problem:\n"
"*** Your name cannot be determined from your system services (gecos).\n"
"*** You would need to set %s and %s\n"
"*** environment variables; otherwise you won't be able to perform\n"
"*** certain operations because of \"empty ident\" errors.\n"
"*** Alternatively, you can use user.name configuration variable.\n\n";

static const char *get_ident(const char *name, const char *email,
const char *date_str, int error_on_no_name)
{
static char buffer[1000];
char date[50];
int i;

if (!name)
name = git_default_name;
if (!email)
email = git_default_email;

if (!*name) {
if (name == git_default_name && env_hint) {
fprintf(stderr, env_hint, au_env, co_env);
env_hint = NULL; /* warn only once, for "git-var -l" */
}
if (error_on_no_name)
die("empty ident %s <%s> not allowed", name, email);
}

strcpy(date, git_default_date);
if (date_str)
parse_date(date_str, date, sizeof(date));

i = copy(buffer, sizeof(buffer), 0, name);
i = add_raw(buffer, sizeof(buffer), i, " <");
i = copy(buffer, sizeof(buffer), i, email);
i = add_raw(buffer, sizeof(buffer), i, "> ");
i = copy(buffer, sizeof(buffer), i, date);
if (i >= sizeof(buffer))
die("Impossibly long personal identifier");
buffer[i] = 0;
return buffer;
}

const char *git_author_info(int error_on_no_name)
{
return get_ident(getenv("GIT_AUTHOR_NAME"),
getenv("GIT_AUTHOR_EMAIL"),
getenv("GIT_AUTHOR_DATE"),
error_on_no_name);
}

const char *git_committer_info(int error_on_no_name)
{
return get_ident(getenv("GIT_COMMITTER_NAME"),
getenv("GIT_COMMITTER_EMAIL"),
getenv("GIT_COMMITTER_DATE"),
error_on_no_name);
}
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