ident.c - jrn/git - Git at Google

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

 static struct strbuf git_default_name = STRBUF_INIT;
 static struct strbuf git_default_email = STRBUF_INIT;
 static struct strbuf git_default_date = STRBUF_INIT;

 #define IDENT_NAME_GIVEN 01
 #define IDENT_MAIL_GIVEN 02
 #define IDENT_ALL_GIVEN (IDENT_NAME_GIVEN|IDENT_MAIL_GIVEN)
 static int committer_ident_explicitly_given;
 static int author_ident_explicitly_given;

 #ifdef NO_GECOS_IN_PWENT
 #define get_gecos(ignored) "&"
 #else
 #define get_gecos(struct_passwd) ((struct_passwd)->pw_gecos)
 #endif

 static void copy_gecos(const struct passwd *w, struct strbuf *name)
 {
 	char *src;

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

 	for (src = get_gecos(w); *src && *src != ','; src++) {
 		int ch = *src;
 		if (ch != '&')
 			strbuf_addch(name, ch);
 		else {
 			/* Sorry, Mr. McDonald... */
 			strbuf_addch(name, toupper(*w->pw_name));
 			strbuf_addstr(name, w->pw_name + 1);
 		}
 	}
 }

 static int add_mailname_host(struct strbuf *buf)
 {
 	FILE *mailname;
 	struct strbuf mailnamebuf = STRBUF_INIT;

 	mailname = fopen("/etc/mailname", "r");
 	if (!mailname) {
 		if (errno != ENOENT)
 			warning("cannot open /etc/mailname: %s",
 				strerror(errno));
 		return -1;
 	}
 	if (strbuf_getline(&mailnamebuf, mailname, '\n') == EOF) {
 		if (ferror(mailname))
 			warning("cannot read /etc/mailname: %s",
 				strerror(errno));
 		strbuf_release(&mailnamebuf);
 		fclose(mailname);
 		return -1;
 	}
 	/* success! */
 	strbuf_addbuf(buf, &mailnamebuf);
 	strbuf_release(&mailnamebuf);
 	fclose(mailname);
 	return 0;
 }

 static void add_domainname(struct strbuf *out)
 {
 	char buf[1024];
 	struct hostent *he;

 	if (gethostname(buf, sizeof(buf))) {
 		warning("cannot get host name: %s", strerror(errno));
 		strbuf_addstr(out, "(none)");
 		return;
 	}
 	if (strchr(buf, '.'))
 		strbuf_addstr(out, buf);
 	else if ((he = gethostbyname(buf)) && strchr(he->h_name, '.'))
 		strbuf_addstr(out, he->h_name);
 	else
 		strbuf_addf(out, "%s.(none)", buf);
 }

 static void copy_email(const struct passwd *pw, struct strbuf *email)
 {
 	/*
 	 * Make up a fake email address
 	 * (name + '@' + hostname [+ '.' + domainname])
 	 */
 	strbuf_addstr(email, pw->pw_name);
 	strbuf_addch(email, '@');

 	if (!add_mailname_host(email))
 		return;	/* read from "/etc/mailname" (Debian) */
 	add_domainname(email);
 }

 const char *ident_default_name(void)
 {
 	if (!git_default_name.len) {
 		copy_gecos(xgetpwuid_self(), &git_default_name);
 		strbuf_trim(&git_default_name);
 	}
 	return git_default_name.buf;
 }

 const char *ident_default_email(void)
 {
 	if (!git_default_email.len) {
 		const char *email = getenv("EMAIL");

 		if (email && email[0]) {
 			strbuf_addstr(&git_default_email, email);
 			committer_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 			author_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 		} else
 			copy_email(xgetpwuid_self(), &git_default_email);
 		strbuf_trim(&git_default_email);
 	}
 	return git_default_email.buf;
 }

 static const char *ident_default_date(void)
 {
 	if (!git_default_date.len)
 		datestamp(&git_default_date);
 	return git_default_date.buf;
 }

 static int crud(unsigned char c)
 {
 	return  c <= 32  ||
 		c == '.' ||
 		c == ',' ||
 		c == ':' ||
 		c == ';' ||
 		c == '<' ||
 		c == '>' ||
 		c == '"' ||
 		c == '\\' ||
 		c == '\'';
 }

 /*
  * Copy over a string to the destination, but avoid special
  * characters ('\n', '<' and '>') and remove crud at the end
  */
 static void strbuf_addstr_without_crud(struct strbuf *sb, const char *src)
 {
 	size_t 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
 	 * an identification line. We can only remove crud, never add it,
 	 * so 'len' is our maximum.
 	 */
 	strbuf_grow(sb, len);
 	for (i = 0; i < len; i++) {
 		c = *src++;
 		switch (c) {
 		case '\n': case '<': case '>':
 			continue;
 		}
 		sb->buf[sb->len++] = c;
 	}
 	sb->buf[sb->len] = '\0';
 }

 /*
  * Reverse of fmt_ident(); given an ident line, split the fields
  * to allow the caller to parse it.
  * Signal a success by returning 0, but date/tz fields of the result
  * can still be NULL if the input line only has the name/email part
  * (e.g. reading from a reflog entry).
  */
 int split_ident_line(struct ident_split *split, const char *line, int len)
 {
 	const char *cp;
 	size_t span;
 	int status = -1;

 	memset(split, 0, sizeof(*split));

 	split->name_begin = line;
 	for (cp = line; *cp && cp < line + len; cp++)
 		if (*cp == '<') {
 			split->mail_begin = cp + 1;
 			break;
 		}
 	if (!split->mail_begin)
 		return status;

 	for (cp = split->mail_begin - 2; line <= cp; cp--)
 		if (!isspace(*cp)) {
 			split->name_end = cp + 1;
 			break;
 		}
 	if (!split->name_end) {
 		/* no human readable name */
 		split->name_end = split->name_begin;
 	}

 	for (cp = split->mail_begin; cp < line + len; cp++)
 		if (*cp == '>') {
 			split->mail_end = cp;
 			break;
 		}
 	if (!split->mail_end)
 		return status;

 	/*
 	 * Look from the end-of-line to find the trailing ">" of the mail
 	 * address, even though we should already know it as split->mail_end.
 	 * This can help in cases of broken idents with an extra ">" somewhere
 	 * in the email address.  Note that we are assuming the timestamp will
 	 * never have a ">" in it.
 	 *
 	 * Note that we will always find some ">" before going off the front of
 	 * the string, because will always hit the split->mail_end closing
 	 * bracket.
 	 */
 	for (cp = line + len - 1; *cp != '>'; cp--)
 		;

 	for (cp = cp + 1; cp < line + len && isspace(*cp); cp++)
 		;
 	if (line + len <= cp)
 		goto person_only;
 	split->date_begin = cp;
 	span = strspn(cp, "0123456789");
 	if (!span)
 		goto person_only;
 	split->date_end = split->date_begin + span;
 	for (cp = split->date_end; cp < line + len && isspace(*cp); cp++)
 		;
 	if (line + len <= cp || (*cp != '+' && *cp != '-'))
 		goto person_only;
 	split->tz_begin = cp;
 	span = strspn(cp + 1, "0123456789");
 	if (!span)
 		goto person_only;
 	split->tz_end = split->tz_begin + 1 + span;
 	return 0;

 person_only:
 	split->date_begin = NULL;
 	split->date_end = NULL;
 	split->tz_begin = NULL;
 	split->tz_end = NULL;
 	return 0;
 }

 static const char *env_hint =
 "\n"
 "*** Please tell me who you are.\n"
 "\n"
 "Run\n"
 "\n"
 "  git config --global user.email \"you@example.com\"\n"
 "  git config --global user.name \"Your Name\"\n"
 "\n"
 "to set your account\'s default identity.\n"
 "Omit --global to set the identity only in this repository.\n"
 "\n";

 const char *fmt_ident(const char *name, const char *email,
 		      const char *date_str, int flag)
 {
 	static struct strbuf ident = STRBUF_INIT;
 	int strict = (flag & IDENT_STRICT);
 	int want_date = !(flag & IDENT_NO_DATE);
 	int want_name = !(flag & IDENT_NO_NAME);

 	if (want_name && !name)
 		name = ident_default_name();
 	if (!email)
 		email = ident_default_email();

 	if (want_name && !*name) {
 		struct passwd *pw;

 		if (strict) {
 			if (name == git_default_name.buf)
 				fputs(env_hint, stderr);
 			die("empty ident name (for <%s>) not allowed", email);
 		}
 		pw = xgetpwuid_self();
 		name = pw->pw_name;
 	}

 	if (strict && email == git_default_email.buf &&
 	    strstr(email, "(none)")) {
 		fputs(env_hint, stderr);
 		die("unable to auto-detect email address (got '%s')", email);
 	}

 	strbuf_reset(&ident);
 	if (want_name) {
 		strbuf_addstr_without_crud(&ident, name);
 		strbuf_addstr(&ident, " <");
 	}
 	strbuf_addstr_without_crud(&ident, email);
 	if (want_name)
 			strbuf_addch(&ident, '>');
 	if (want_date) {
 		strbuf_addch(&ident, ' ');
 		if (date_str && date_str[0]) {
 			if (parse_date(date_str, &ident) < 0)
 				die("invalid date format: %s", date_str);
 		}
 		else
 			strbuf_addstr(&ident, ident_default_date());
 	}

 	return ident.buf;
 }

 const char *fmt_name(const char *name, const char *email)
 {
 	return fmt_ident(name, email, NULL, IDENT_STRICT | IDENT_NO_DATE);
 }

 const char *git_author_info(int flag)
 {
 	if (getenv("GIT_AUTHOR_NAME"))
 		author_ident_explicitly_given |= IDENT_NAME_GIVEN;
 	if (getenv("GIT_AUTHOR_EMAIL"))
 		author_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 	return fmt_ident(getenv("GIT_AUTHOR_NAME"),
 			 getenv("GIT_AUTHOR_EMAIL"),
 			 getenv("GIT_AUTHOR_DATE"),
 			 flag);
 }

 const char *git_committer_info(int flag)
 {
 	if (getenv("GIT_COMMITTER_NAME"))
 		committer_ident_explicitly_given |= IDENT_NAME_GIVEN;
 	if (getenv("GIT_COMMITTER_EMAIL"))
 		committer_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 	return fmt_ident(getenv("GIT_COMMITTER_NAME"),
 			 getenv("GIT_COMMITTER_EMAIL"),
 			 getenv("GIT_COMMITTER_DATE"),
 			 flag);
 }

 static int ident_is_sufficient(int user_ident_explicitly_given)
 {
 #ifndef WINDOWS
 	return (user_ident_explicitly_given & IDENT_MAIL_GIVEN);
 #else
 	return (user_ident_explicitly_given == IDENT_ALL_GIVEN);
 #endif
 }

 int committer_ident_sufficiently_given(void)
 {
 	return ident_is_sufficient(committer_ident_explicitly_given);
 }

 int author_ident_sufficiently_given(void)
 {
 	return ident_is_sufficient(author_ident_explicitly_given);
 }

 int git_ident_config(const char *var, const char *value, void *data)
 {
 	if (!strcmp(var, "user.name")) {
 		if (!value)
 			return config_error_nonbool(var);
 		strbuf_reset(&git_default_name);
 		strbuf_addstr(&git_default_name, value);
 		committer_ident_explicitly_given |= IDENT_NAME_GIVEN;
 		author_ident_explicitly_given |= IDENT_NAME_GIVEN;
 		return 0;
 	}

 	if (!strcmp(var, "user.email")) {
 		if (!value)
 			return config_error_nonbool(var);
 		strbuf_reset(&git_default_email);
 		strbuf_addstr(&git_default_email, value);
 		committer_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 		author_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 		return 0;
 	}

 	return 0;
 }

 static int buf_cmp(const char *a_begin, const char *a_end,
 		   const char *b_begin, const char *b_end)
 {
 	int a_len = a_end - a_begin;
 	int b_len = b_end - b_begin;
 	int min = a_len < b_len ? a_len : b_len;
 	int cmp;

 	cmp = memcmp(a_begin, b_begin, min);
 	if (cmp)
 		return cmp;

 	return a_len - b_len;
 }

 int ident_cmp(const struct ident_split *a,
 	      const struct ident_split *b)
 {
 	int cmp;

 	cmp = buf_cmp(a->mail_begin, a->mail_end,
 		      b->mail_begin, b->mail_end);
 	if (cmp)
 		return cmp;

 	return buf_cmp(a->name_begin, a->name_end,
 		       b->name_begin, b->name_end);
 }
	/*
	* ident.c
	*
	* create git identifier lines of the form "name <email> date"
	*
	* Copyright (C) 2005 Linus Torvalds
	*/
	#include "cache.h"

	static struct strbuf git_default_name = STRBUF_INIT;
	static struct strbuf git_default_email = STRBUF_INIT;
	static struct strbuf git_default_date = STRBUF_INIT;

	#define IDENT_NAME_GIVEN 01
	#define IDENT_MAIL_GIVEN 02
	#define IDENT_ALL_GIVEN (IDENT_NAME_GIVEN\|IDENT_MAIL_GIVEN)
	static int committer_ident_explicitly_given;
	static int author_ident_explicitly_given;

	#ifdef NO_GECOS_IN_PWENT
	#define get_gecos(ignored) "&"
	#else
	#define get_gecos(struct_passwd) ((struct_passwd)->pw_gecos)
	#endif

	static void copy_gecos(const struct passwd w, struct strbuf name)
	{
	char *src;

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

	for (src = get_gecos(w); src && src != ','; src++) {
	int ch = *src;
	if (ch != '&')
	strbuf_addch(name, ch);
	else {
	/* Sorry, Mr. McDonald... */
	strbuf_addch(name, toupper(*w->pw_name));
	strbuf_addstr(name, w->pw_name + 1);
	}
	}
	}

	static int add_mailname_host(struct strbuf *buf)
	{
	FILE *mailname;
	struct strbuf mailnamebuf = STRBUF_INIT;

	mailname = fopen("/etc/mailname", "r");
	if (!mailname) {
	if (errno != ENOENT)
	warning("cannot open /etc/mailname: %s",
	strerror(errno));
	return -1;
	}
	if (strbuf_getline(&mailnamebuf, mailname, '\n') == EOF) {
	if (ferror(mailname))
	warning("cannot read /etc/mailname: %s",
	strerror(errno));
	strbuf_release(&mailnamebuf);
	fclose(mailname);
	return -1;
	}
	/* success! */
	strbuf_addbuf(buf, &mailnamebuf);
	strbuf_release(&mailnamebuf);
	fclose(mailname);
	return 0;
	}

	static void add_domainname(struct strbuf *out)
	{
	char buf[1024];
	struct hostent *he;

	if (gethostname(buf, sizeof(buf))) {
	warning("cannot get host name: %s", strerror(errno));
	strbuf_addstr(out, "(none)");
	return;
	}
	if (strchr(buf, '.'))
	strbuf_addstr(out, buf);
	else if ((he = gethostbyname(buf)) && strchr(he->h_name, '.'))
	strbuf_addstr(out, he->h_name);
	else
	strbuf_addf(out, "%s.(none)", buf);
	}

	static void copy_email(const struct passwd pw, struct strbuf email)
	{
	/*
	* Make up a fake email address
	* (name + '@' + hostname [+ '.' + domainname])
	*/
	strbuf_addstr(email, pw->pw_name);
	strbuf_addch(email, '@');

	if (!add_mailname_host(email))
	return; /* read from "/etc/mailname" (Debian) */
	add_domainname(email);
	}

	const char *ident_default_name(void)
	{
	if (!git_default_name.len) {
	copy_gecos(xgetpwuid_self(), &git_default_name);
	strbuf_trim(&git_default_name);
	}
	return git_default_name.buf;
	}

	const char *ident_default_email(void)
	{
	if (!git_default_email.len) {
	const char *email = getenv("EMAIL");

	if (email && email[0]) {
	strbuf_addstr(&git_default_email, email);
	committer_ident_explicitly_given \|= IDENT_MAIL_GIVEN;
	author_ident_explicitly_given \|= IDENT_MAIL_GIVEN;
	} else
	copy_email(xgetpwuid_self(), &git_default_email);
	strbuf_trim(&git_default_email);
	}
	return git_default_email.buf;
	}

	static const char *ident_default_date(void)
	{
	if (!git_default_date.len)
	datestamp(&git_default_date);
	return git_default_date.buf;
	}

	static int crud(unsigned char c)
	{
	return c <= 32 \|\|
	c == '.' \|\|
	c == ',' \|\|
	c == ':' \|\|
	c == ';' \|\|
	c == '<' \|\|
	c == '>' \|\|
	c == '"' \|\|
	c == '\\' \|\|
	c == '\'';
	}

	/*
	* Copy over a string to the destination, but avoid special
	* characters ('\n', '<' and '>') and remove crud at the end
	*/
	static void strbuf_addstr_without_crud(struct strbuf sb, const char src)
	{
	size_t 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
	* an identification line. We can only remove crud, never add it,
	* so 'len' is our maximum.
	*/
	strbuf_grow(sb, len);
	for (i = 0; i < len; i++) {
	c = *src++;
	switch (c) {
	case '\n': case '<': case '>':
	continue;
	}
	sb->buf[sb->len++] = c;
	}
	sb->buf[sb->len] = '\0';
	}

	/*
	* Reverse of fmt_ident(); given an ident line, split the fields
	* to allow the caller to parse it.
	* Signal a success by returning 0, but date/tz fields of the result
	* can still be NULL if the input line only has the name/email part
	* (e.g. reading from a reflog entry).
	*/
	int split_ident_line(struct ident_split split, const char line, int len)
	{
	const char *cp;
	size_t span;
	int status = -1;

	memset(split, 0, sizeof(*split));

	split->name_begin = line;
	for (cp = line; *cp && cp < line + len; cp++)
	if (*cp == '<') {
	split->mail_begin = cp + 1;
	break;
	}
	if (!split->mail_begin)
	return status;

	for (cp = split->mail_begin - 2; line <= cp; cp--)
	if (!isspace(*cp)) {
	split->name_end = cp + 1;
	break;
	}
	if (!split->name_end) {
	/* no human readable name */
	split->name_end = split->name_begin;
	}

	for (cp = split->mail_begin; cp < line + len; cp++)
	if (*cp == '>') {
	split->mail_end = cp;
	break;
	}
	if (!split->mail_end)
	return status;

	/*
	* Look from the end-of-line to find the trailing ">" of the mail
	* address, even though we should already know it as split->mail_end.
	* This can help in cases of broken idents with an extra ">" somewhere
	* in the email address. Note that we are assuming the timestamp will
	* never have a ">" in it.
	*
	* Note that we will always find some ">" before going off the front of
	* the string, because will always hit the split->mail_end closing
	* bracket.
	*/
	for (cp = line + len - 1; *cp != '>'; cp--)
	;

	for (cp = cp + 1; cp < line + len && isspace(*cp); cp++)
	;
	if (line + len <= cp)
	goto person_only;
	split->date_begin = cp;
	span = strspn(cp, "0123456789");
	if (!span)
	goto person_only;
	split->date_end = split->date_begin + span;
	for (cp = split->date_end; cp < line + len && isspace(*cp); cp++)
	;
	if (line + len <= cp \|\| (cp != '+' && cp != '-'))
	goto person_only;
	split->tz_begin = cp;
	span = strspn(cp + 1, "0123456789");
	if (!span)
	goto person_only;
	split->tz_end = split->tz_begin + 1 + span;
	return 0;

	person_only:
	split->date_begin = NULL;
	split->date_end = NULL;
	split->tz_begin = NULL;
	split->tz_end = NULL;
	return 0;
	}

	static const char *env_hint =
	"\n"
	"*** Please tell me who you are.\n"
	"\n"
	"Run\n"
	"\n"
	" git config --global user.email \"you@example.com\"\n"
	" git config --global user.name \"Your Name\"\n"
	"\n"
	"to set your account\'s default identity.\n"
	"Omit --global to set the identity only in this repository.\n"
	"\n";

	const char fmt_ident(const char name, const char *email,
	const char *date_str, int flag)
	{
	static struct strbuf ident = STRBUF_INIT;
	int strict = (flag & IDENT_STRICT);
	int want_date = !(flag & IDENT_NO_DATE);
	int want_name = !(flag & IDENT_NO_NAME);

	if (want_name && !name)
	name = ident_default_name();
	if (!email)
	email = ident_default_email();

	if (want_name && !*name) {
	struct passwd *pw;

	if (strict) {
	if (name == git_default_name.buf)
	fputs(env_hint, stderr);
	die("empty ident name (for <%s>) not allowed", email);
	}
	pw = xgetpwuid_self();
	name = pw->pw_name;
	}

	if (strict && email == git_default_email.buf &&
	strstr(email, "(none)")) {
	fputs(env_hint, stderr);
	die("unable to auto-detect email address (got '%s')", email);
	}

	strbuf_reset(&ident);
	if (want_name) {
	strbuf_addstr_without_crud(&ident, name);
	strbuf_addstr(&ident, " <");
	}
	strbuf_addstr_without_crud(&ident, email);
	if (want_name)
	strbuf_addch(&ident, '>');
	if (want_date) {
	strbuf_addch(&ident, ' ');
	if (date_str && date_str[0]) {
	if (parse_date(date_str, &ident) < 0)
	die("invalid date format: %s", date_str);
	}
	else
	strbuf_addstr(&ident, ident_default_date());
	}

	return ident.buf;
	}

	const char fmt_name(const char name, const char *email)
	{
	return fmt_ident(name, email, NULL, IDENT_STRICT \| IDENT_NO_DATE);
	}

	const char *git_author_info(int flag)
	{
	if (getenv("GIT_AUTHOR_NAME"))
	author_ident_explicitly_given \|= IDENT_NAME_GIVEN;
	if (getenv("GIT_AUTHOR_EMAIL"))
	author_ident_explicitly_given \|= IDENT_MAIL_GIVEN;
	return fmt_ident(getenv("GIT_AUTHOR_NAME"),
	getenv("GIT_AUTHOR_EMAIL"),
	getenv("GIT_AUTHOR_DATE"),
	flag);
	}

	const char *git_committer_info(int flag)
	{
	if (getenv("GIT_COMMITTER_NAME"))
	committer_ident_explicitly_given \|= IDENT_NAME_GIVEN;
	if (getenv("GIT_COMMITTER_EMAIL"))
	committer_ident_explicitly_given \|= IDENT_MAIL_GIVEN;
	return fmt_ident(getenv("GIT_COMMITTER_NAME"),
	getenv("GIT_COMMITTER_EMAIL"),
	getenv("GIT_COMMITTER_DATE"),
	flag);
	}

	static int ident_is_sufficient(int user_ident_explicitly_given)
	{
	#ifndef WINDOWS
	return (user_ident_explicitly_given & IDENT_MAIL_GIVEN);
	#else
	return (user_ident_explicitly_given == IDENT_ALL_GIVEN);
	#endif
	}

	int committer_ident_sufficiently_given(void)
	{
	return ident_is_sufficient(committer_ident_explicitly_given);
	}

	int author_ident_sufficiently_given(void)
	{
	return ident_is_sufficient(author_ident_explicitly_given);
	}

	int git_ident_config(const char var, const char value, void *data)
	{
	if (!strcmp(var, "user.name")) {
	if (!value)
	return config_error_nonbool(var);
	strbuf_reset(&git_default_name);
	strbuf_addstr(&git_default_name, value);
	committer_ident_explicitly_given \|= IDENT_NAME_GIVEN;
	author_ident_explicitly_given \|= IDENT_NAME_GIVEN;
	return 0;
	}

	if (!strcmp(var, "user.email")) {
	if (!value)
	return config_error_nonbool(var);
	strbuf_reset(&git_default_email);
	strbuf_addstr(&git_default_email, value);
	committer_ident_explicitly_given \|= IDENT_MAIL_GIVEN;
	author_ident_explicitly_given \|= IDENT_MAIL_GIVEN;
	return 0;
	}

	return 0;
	}

	static int buf_cmp(const char a_begin, const char a_end,
	const char b_begin, const char b_end)
	{
	int a_len = a_end - a_begin;
	int b_len = b_end - b_begin;
	int min = a_len < b_len ? a_len : b_len;
	int cmp;

	cmp = memcmp(a_begin, b_begin, min);
	if (cmp)
	return cmp;

	return a_len - b_len;
	}

	int ident_cmp(const struct ident_split *a,
	const struct ident_split *b)
	{
	int cmp;

	cmp = buf_cmp(a->mail_begin, a->mail_end,
	b->mail_begin, b->mail_end);
	if (cmp)
	return cmp;

	return buf_cmp(a->name_begin, a->name_end,
	b->name_begin, b->name_end);
	}