summaryrefslogtreecommitdiffstats
path: root/ident.c
blob: cc7afdbf8197e981e02b6257a4618197063db69f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
/*
 * ident.c
 *
 * create git identifier lines of the form "name <email> date"
 *
 * Copyright (C) 2005 Linus Torvalds
 */
#include "git-compat-util.h"
#include "ident.h"
#include "config.h"
#include "date.h"
#include "gettext.h"
#include "mailmap.h"
#include "strbuf.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;
static struct strbuf git_author_name = STRBUF_INIT;
static struct strbuf git_author_email = STRBUF_INIT;
static struct strbuf git_committer_name = STRBUF_INIT;
static struct strbuf git_committer_email = STRBUF_INIT;
static int default_email_is_bogus;
static int default_name_is_bogus;

static int ident_use_config_only;

#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;
static int ident_config_given;

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

static struct passwd *xgetpwuid_self(int *is_bogus)
{
	struct passwd *pw;

	errno = 0;
	pw = getpwuid(getuid());
	if (!pw) {
		static struct passwd fallback;
		fallback.pw_name = "unknown";
#ifndef NO_GECOS_IN_PWENT
		fallback.pw_gecos = "Unknown";
#endif
		pw = &fallback;
		if (is_bogus)
			*is_bogus = 1;
	}
	return pw;
}

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_or_warn("/etc/mailname", "r");
	if (!mailname)
		return -1;

	if (strbuf_getline(&mailnamebuf, mailname) == EOF) {
		if (ferror(mailname))
			warning_errno("cannot read /etc/mailname");
		strbuf_release(&mailnamebuf);
		fclose(mailname);
		return -1;
	}
	/* success! */
	strbuf_addbuf(buf, &mailnamebuf);
	strbuf_release(&mailnamebuf);
	fclose(mailname);
	return 0;
}

static int canonical_name(const char *host, struct strbuf *out)
{
	int status = -1;

#ifndef NO_IPV6
	struct addrinfo hints, *ai;
	memset (&hints, '\0', sizeof (hints));
	hints.ai_flags = AI_CANONNAME;
	if (!getaddrinfo(host, NULL, &hints, &ai)) {
		if (ai && ai->ai_canonname && strchr(ai->ai_canonname, '.')) {
			strbuf_addstr(out, ai->ai_canonname);
			status = 0;
		}
		freeaddrinfo(ai);
	}
#else
	struct hostent *he = gethostbyname(host);
	if (he && strchr(he->h_name, '.')) {
		strbuf_addstr(out, he->h_name);
		status = 0;
	}
#endif /* NO_IPV6 */

	return status;
}

static void add_domainname(struct strbuf *out, int *is_bogus)
{
	char buf[HOST_NAME_MAX + 1];

	if (xgethostname(buf, sizeof(buf))) {
		warning_errno("cannot get host name");
		strbuf_addstr(out, "(none)");
		*is_bogus = 1;
		return;
	}
	if (strchr(buf, '.'))
		strbuf_addstr(out, buf);
	else if (canonical_name(buf, out) < 0) {
		strbuf_addf(out, "%s.(none)", buf);
		*is_bogus = 1;
	}
}

static void copy_email(const struct passwd *pw, struct strbuf *email,
		       int *is_bogus)
{
	/*
	 * 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, is_bogus);
}

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

const char *ident_default_email(void)
{
	if (!(ident_config_given & IDENT_MAIL_GIVEN) && !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 if ((email = query_user_email()) && email[0]) {
			strbuf_addstr(&git_default_email, email);
			free((char *)email);
		} else
			copy_email(xgetpwuid_self(&default_email_is_bogus),
				   &git_default_email, &default_email_is_bogus);
		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;
}

void reset_ident_date(void)
{
	strbuf_reset(&git_default_date);
}

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

static int has_non_crud(const char *str)
{
	for (; *str; str++) {
		if (!crud(*str))
			return 1;
	}
	return 0;
}

/*
 * 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;
}

/*
 * Returns the difference between the new and old length of the ident line.
 */
static ssize_t rewrite_ident_line(const char *person, size_t len,
				   struct strbuf *buf,
				   struct string_list *mailmap)
{
	size_t namelen, maillen;
	const char *name;
	const char *mail;
	struct ident_split ident;

	if (split_ident_line(&ident, person, len))
		return 0;

	mail = ident.mail_begin;
	maillen = ident.mail_end - ident.mail_begin;
	name = ident.name_begin;
	namelen = ident.name_end - ident.name_begin;

	if (map_user(mailmap, &mail, &maillen, &name, &namelen)) {
		struct strbuf namemail = STRBUF_INIT;
		size_t newlen;

		strbuf_addf(&namemail, "%.*s <%.*s>",
			    (int)namelen, name, (int)maillen, mail);

		strbuf_splice(buf, ident.name_begin - buf->buf,
			      ident.mail_end - ident.name_begin + 1,
			      namemail.buf, namemail.len);
		newlen = namemail.len;

		strbuf_release(&namemail);

		return newlen - (ident.mail_end - ident.name_begin);
	}

	return 0;
}

void apply_mailmap_to_header(struct strbuf *buf, const char **header,
			       struct string_list *mailmap)
{
	size_t buf_offset = 0;

	if (!mailmap)
		return;

	for (;;) {
		const char *person, *line;
		size_t i;
		int found_header = 0;

		line = buf->buf + buf_offset;
		if (!*line || *line == '\n')
			return; /* End of headers */

		for (i = 0; header[i]; i++)
			if (skip_prefix(line, header[i], &person)) {
				const char *endp = strchrnul(person, '\n');
				found_header = 1;
				buf_offset += endp - line;
				buf_offset += rewrite_ident_line(person, endp - person, buf, mailmap);
				break;
			}

		if (!found_header) {
			buf_offset = strchrnul(line, '\n') - buf->buf;
			if (buf->buf[buf_offset] == '\n')
				buf_offset++;
		}
	}
}

static void ident_env_hint(enum want_ident whose_ident)
{
	switch (whose_ident) {
	case WANT_AUTHOR_IDENT:
		fputs(_("Author identity unknown\n"), stderr);
		break;
	case WANT_COMMITTER_IDENT:
		fputs(_("Committer identity unknown\n"), stderr);
		break;
	default:
		break;
	}

	fputs(_("\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"), stderr);
}

const char *fmt_ident(const char *name, const char *email,
		      enum want_ident whose_ident, const char *date_str, int flag)
{
	static int index;
	static struct strbuf ident_pool[2] = { STRBUF_INIT, STRBUF_INIT };
	int strict = (flag & IDENT_STRICT);
	int want_date = !(flag & IDENT_NO_DATE);
	int want_name = !(flag & IDENT_NO_NAME);

	struct strbuf *ident = &ident_pool[index];
	index = (index + 1) % ARRAY_SIZE(ident_pool);

	if (!email) {
		if (whose_ident == WANT_AUTHOR_IDENT && git_author_email.len)
			email = git_author_email.buf;
		else if (whose_ident == WANT_COMMITTER_IDENT && git_committer_email.len)
			email = git_committer_email.buf;
	}
	if (!email) {
		if (strict && ident_use_config_only
		    && !(ident_config_given & IDENT_MAIL_GIVEN)) {
			ident_env_hint(whose_ident);
			die(_("no email was given and auto-detection is disabled"));
		}
		email = ident_default_email();
		if (strict && default_email_is_bogus) {
			ident_env_hint(whose_ident);
			die(_("unable to auto-detect email address (got '%s')"), email);
		}
	}

	if (want_name) {
		int using_default = 0;
		if (!name) {
			if (whose_ident == WANT_AUTHOR_IDENT && git_author_name.len)
				name = git_author_name.buf;
			else if (whose_ident == WANT_COMMITTER_IDENT &&
					git_committer_name.len)
				name = git_committer_name.buf;
		}
		if (!name) {
			if (strict && ident_use_config_only
			    && !(ident_config_given & IDENT_NAME_GIVEN)) {
				ident_env_hint(whose_ident);
				die(_("no name was given and auto-detection is disabled"));
			}
			name = ident_default_name();
			using_default = 1;
			if (strict && default_name_is_bogus) {
				ident_env_hint(whose_ident);
				die(_("unable to auto-detect name (got '%s')"), name);
			}
		}
		if (!*name) {
			struct passwd *pw;
			if (strict) {
				if (using_default)
					ident_env_hint(whose_ident);
				die(_("empty ident name (for <%s>) not allowed"), email);
			}
			pw = xgetpwuid_self(NULL);
			name = pw->pw_name;
		}
		if (strict && !has_non_crud(name))
			die(_("name consists only of disallowed characters: %s"), name);
	}

	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(enum want_ident whose_ident)
{
	char *name = NULL;
	char *email = NULL;

	switch (whose_ident) {
	case WANT_BLANK_IDENT:
		break;
	case WANT_AUTHOR_IDENT:
		name = getenv("GIT_AUTHOR_NAME");
		email = getenv("GIT_AUTHOR_EMAIL");
		break;
	case WANT_COMMITTER_IDENT:
		name = getenv("GIT_COMMITTER_NAME");
		email = getenv("GIT_COMMITTER_EMAIL");
		break;
	}
	return fmt_ident(name, email, whose_ident, 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"),
			 WANT_AUTHOR_IDENT,
			 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"),
			 WANT_COMMITTER_IDENT,
			 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);
}

static int set_ident(const char *var, const char *value)
{
	if (!strcmp(var, "author.name")) {
		if (!value)
			return config_error_nonbool(var);
		strbuf_reset(&git_author_name);
		strbuf_addstr(&git_author_name, value);
		author_ident_explicitly_given |= IDENT_NAME_GIVEN;
		ident_config_given |= IDENT_NAME_GIVEN;
		return 0;
	}

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

	if (!strcmp(var, "committer.name")) {
		if (!value)
			return config_error_nonbool(var);
		strbuf_reset(&git_committer_name);
		strbuf_addstr(&git_committer_name, value);
		committer_ident_explicitly_given |= IDENT_NAME_GIVEN;
		ident_config_given |= IDENT_NAME_GIVEN;
		return 0;
	}

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

	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;
		ident_config_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;
		ident_config_given |= IDENT_MAIL_GIVEN;
		return 0;
	}

	return 0;
}

int git_ident_config(const char *var, const char *value,
		     const struct config_context *ctx UNUSED,
		     void *data UNUSED)
{
	if (!strcmp(var, "user.useconfigonly")) {
		ident_use_config_only = git_config_bool(var, value);
		return 0;
	}

	return set_ident(var, value);
}

static void set_env_if(const char *key, const char *value, int *given, int bit)
{
	if ((*given & bit) || getenv(key))
		return; /* nothing to do */
	setenv(key, value, 0);
	*given |= bit;
}

void prepare_fallback_ident(const char *name, const char *email)
{
	set_env_if("GIT_AUTHOR_NAME", name,
		   &author_ident_explicitly_given, IDENT_NAME_GIVEN);
	set_env_if("GIT_AUTHOR_EMAIL", email,
		   &author_ident_explicitly_given, IDENT_MAIL_GIVEN);
	set_env_if("GIT_COMMITTER_NAME", name,
		   &committer_ident_explicitly_given, IDENT_NAME_GIVEN);
	set_env_if("GIT_COMMITTER_EMAIL", email,
		   &committer_ident_explicitly_given, IDENT_MAIL_GIVEN);
}

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);
}