[thirdparty/git.git] / ws.c

/*
 * Whitespace rules
 *
 * Copyright (c) 2007 Junio C Hamano
 */

#include "cache.h"
#include "attr.h"

static struct whitespace_rule {
	const char *rule_name;
	unsigned rule_bits;
	unsigned loosens_error:1,
		exclude_default:1;
} whitespace_rule_names[] = {
	{ "trailing-space", WS_TRAILING_SPACE, 0 },
	{ "space-before-tab", WS_SPACE_BEFORE_TAB, 0 },
	{ "indent-with-non-tab", WS_INDENT_WITH_NON_TAB, 0 },
	{ "cr-at-eol", WS_CR_AT_EOL, 1 },
	{ "blank-at-eol", WS_BLANK_AT_EOL, 0 },
	{ "blank-at-eof", WS_BLANK_AT_EOF, 0 },
	{ "tab-in-indent", WS_TAB_IN_INDENT, 0, 1 },
};

unsigned parse_whitespace_rule(const char *string)
{
	unsigned rule = WS_DEFAULT_RULE;

	while (string) {
		int i;
		size_t len;
		const char *ep;
		int negated = 0;

		string = string + strspn(string, ", \t\n\r");
		ep = strchrnul(string, ',');
		len = ep - string;

		if (*string == '-') {
			negated = 1;
			string++;
			len--;
		}
		if (!len)
			break;
		for (i = 0; i < ARRAY_SIZE(whitespace_rule_names); i++) {
			if (strncmp(whitespace_rule_names[i].rule_name,
				    string, len))
				continue;
			if (negated)
				rule &= ~whitespace_rule_names[i].rule_bits;
			else
				rule |= whitespace_rule_names[i].rule_bits;
			break;
		}
		if (strncmp(string, "tabwidth=", 9) == 0) {
			unsigned tabwidth = atoi(string + 9);
			if (0 < tabwidth && tabwidth < 0100) {
				rule &= ~WS_TAB_WIDTH_MASK;
				rule |= tabwidth;
			}
			else
				warning("tabwidth %.*s out of range",
					(int)(len - 9), string + 9);
		}
		string = ep;
	}

	if (rule & WS_TAB_IN_INDENT && rule & WS_INDENT_WITH_NON_TAB)
		die("cannot enforce both tab-in-indent and indent-with-non-tab");
	return rule;
}

static void setup_whitespace_attr_check(struct attr_check_item *check)
{
	static struct git_attr *attr_whitespace;

	if (!attr_whitespace)
		attr_whitespace = git_attr("whitespace");
	check[0].attr = attr_whitespace;
}

unsigned whitespace_rule(const char *pathname)
{
	struct attr_check_item attr_whitespace_rule;

	setup_whitespace_attr_check(&attr_whitespace_rule);
	if (!git_check_attrs(pathname, 1, &attr_whitespace_rule)) {
		const char *value;

		value = attr_whitespace_rule.value;
		if (ATTR_TRUE(value)) {
			/* true (whitespace) */
			unsigned all_rule = ws_tab_width(whitespace_rule_cfg);
			int i;
			for (i = 0; i < ARRAY_SIZE(whitespace_rule_names); i++)
				if (!whitespace_rule_names[i].loosens_error &&
				    !whitespace_rule_names[i].exclude_default)
					all_rule |= whitespace_rule_names[i].rule_bits;
			return all_rule;
		} else if (ATTR_FALSE(value)) {
			/* false (-whitespace) */
			return ws_tab_width(whitespace_rule_cfg);
		} else if (ATTR_UNSET(value)) {
			/* reset to default (!whitespace) */
			return whitespace_rule_cfg;
		} else {
			/* string */
			return parse_whitespace_rule(value);
		}
	} else {
		return whitespace_rule_cfg;
	}
}

/* The returned string should be freed by the caller. */
char *whitespace_error_string(unsigned ws)
{
	struct strbuf err = STRBUF_INIT;
	if ((ws & WS_TRAILING_SPACE) == WS_TRAILING_SPACE)
		strbuf_addstr(&err, "trailing whitespace");
	else {
		if (ws & WS_BLANK_AT_EOL)
			strbuf_addstr(&err, "trailing whitespace");
		if (ws & WS_BLANK_AT_EOF) {
			if (err.len)
				strbuf_addstr(&err, ", ");
			strbuf_addstr(&err, "new blank line at EOF");
		}
	}
	if (ws & WS_SPACE_BEFORE_TAB) {
		if (err.len)
			strbuf_addstr(&err, ", ");
		strbuf_addstr(&err, "space before tab in indent");
	}
	if (ws & WS_INDENT_WITH_NON_TAB) {
		if (err.len)
			strbuf_addstr(&err, ", ");
		strbuf_addstr(&err, "indent with spaces");
	}
	if (ws & WS_TAB_IN_INDENT) {
		if (err.len)
			strbuf_addstr(&err, ", ");
		strbuf_addstr(&err, "tab in indent");
	}
	return strbuf_detach(&err, NULL);
}

/* If stream is non-NULL, emits the line after checking. */
static unsigned ws_check_emit_1(const char *line, int len, unsigned ws_rule,
				FILE *stream, const char *set,
				const char *reset, const char *ws)
{
	unsigned result = 0;
	int written = 0;
	int trailing_whitespace = -1;
	int trailing_newline = 0;
	int trailing_carriage_return = 0;
	int i;

	/* Logic is simpler if we temporarily ignore the trailing newline. */
	if (len > 0 && line[len - 1] == '\n') {
		trailing_newline = 1;
		len--;
	}
	if ((ws_rule & WS_CR_AT_EOL) &&
	    len > 0 && line[len - 1] == '\r') {
		trailing_carriage_return = 1;
		len--;
	}

	/* Check for trailing whitespace. */
	if (ws_rule & WS_BLANK_AT_EOL) {
		for (i = len - 1; i >= 0; i--) {
			if (isspace(line[i])) {
				trailing_whitespace = i;
				result |= WS_BLANK_AT_EOL;
			}
			else
				break;
		}
	}

	if (trailing_whitespace == -1)
		trailing_whitespace = len;

	/* Check indentation */
	for (i = 0; i < trailing_whitespace; i++) {
		if (line[i] == ' ')
			continue;
		if (line[i] != '\t')
			break;
		if ((ws_rule & WS_SPACE_BEFORE_TAB) && written < i) {
			result |= WS_SPACE_BEFORE_TAB;
			if (stream) {
				fputs(ws, stream);
				fwrite(line + written, i - written, 1, stream);
				fputs(reset, stream);
				fwrite(line + i, 1, 1, stream);
			}
		} else if (ws_rule & WS_TAB_IN_INDENT) {
			result |= WS_TAB_IN_INDENT;
			if (stream) {
				fwrite(line + written, i - written, 1, stream);
				fputs(ws, stream);
				fwrite(line + i, 1, 1, stream);
				fputs(reset, stream);
			}
		} else if (stream) {
			fwrite(line + written, i - written + 1, 1, stream);
		}
		written = i + 1;
	}

	/* Check for indent using non-tab. */
	if ((ws_rule & WS_INDENT_WITH_NON_TAB) && i - written >= ws_tab_width(ws_rule)) {
		result |= WS_INDENT_WITH_NON_TAB;
		if (stream) {
			fputs(ws, stream);
			fwrite(line + written, i - written, 1, stream);
			fputs(reset, stream);
		}
		written = i;
	}

	if (stream) {
		/*
		 * Now the rest of the line starts at "written".
		 * The non-highlighted part ends at "trailing_whitespace".
		 */

		/* Emit non-highlighted (middle) segment. */
		if (trailing_whitespace - written > 0) {
			fputs(set, stream);
			fwrite(line + written,
			    trailing_whitespace - written, 1, stream);
			fputs(reset, stream);
		}

		/* Highlight errors in trailing whitespace. */
		if (trailing_whitespace != len) {
			fputs(ws, stream);
			fwrite(line + trailing_whitespace,
			    len - trailing_whitespace, 1, stream);
			fputs(reset, stream);
		}
		if (trailing_carriage_return)
			fputc('\r', stream);
		if (trailing_newline)
			fputc('\n', stream);
	}
	return result;
}

void ws_check_emit(const char *line, int len, unsigned ws_rule,
		   FILE *stream, const char *set,
		   const char *reset, const char *ws)
{
	(void)ws_check_emit_1(line, len, ws_rule, stream, set, reset, ws);
}

unsigned ws_check(const char *line, int len, unsigned ws_rule)
{
	return ws_check_emit_1(line, len, ws_rule, NULL, NULL, NULL, NULL);
}

int ws_blank_line(const char *line, int len, unsigned ws_rule)
{
	/*
	 * We _might_ want to treat CR differently from other
	 * whitespace characters when ws_rule has WS_CR_AT_EOL, but
	 * for now we just use this stupid definition.
	 */
	while (len-- > 0) {
		if (!isspace(*line))
			return 0;
		line++;
	}
	return 1;
}

/* Copy the line onto the end of the strbuf while fixing whitespaces */
void ws_fix_copy(struct strbuf *dst, const char *src, int len, unsigned ws_rule, int *error_count)
{
	/*
	 * len is number of bytes to be copied from src, starting
	 * at src.  Typically src[len-1] is '\n', unless this is
	 * the incomplete last line.
	 */
	int i;
	int add_nl_to_tail = 0;
	int add_cr_to_tail = 0;
	int fixed = 0;
	int last_tab_in_indent = -1;
	int last_space_in_indent = -1;
	int need_fix_leading_space = 0;

	/*
	 * Strip trailing whitespace
	 */
	if (ws_rule & WS_BLANK_AT_EOL) {
		if (0 < len && src[len - 1] == '\n') {
			add_nl_to_tail = 1;
			len--;
			if (0 < len && src[len - 1] == '\r') {
				add_cr_to_tail = !!(ws_rule & WS_CR_AT_EOL);
				len--;
			}
		}
		if (0 < len && isspace(src[len - 1])) {
			while (0 < len && isspace(src[len-1]))
				len--;
			fixed = 1;
		}
	}

	/*
	 * Check leading whitespaces (indent)
	 */
	for (i = 0; i < len; i++) {
		char ch = src[i];
		if (ch == '\t') {
			last_tab_in_indent = i;
			if ((ws_rule & WS_SPACE_BEFORE_TAB) &&
			    0 <= last_space_in_indent)
			    need_fix_leading_space = 1;
		} else if (ch == ' ') {
			last_space_in_indent = i;
			if ((ws_rule & WS_INDENT_WITH_NON_TAB) &&
			    ws_tab_width(ws_rule) <= i - last_tab_in_indent)
				need_fix_leading_space = 1;
		} else
			break;
	}

	if (need_fix_leading_space) {
		/* Process indent ourselves */
		int consecutive_spaces = 0;
		int last = last_tab_in_indent + 1;

		if (ws_rule & WS_INDENT_WITH_NON_TAB) {
			/* have "last" point at one past the indent */
			if (last_tab_in_indent < last_space_in_indent)
				last = last_space_in_indent + 1;
			else
				last = last_tab_in_indent + 1;
		}

		/*
		 * between src[0..last-1], strip the funny spaces,
		 * updating them to tab as needed.
		 */
		for (i = 0; i < last; i++) {
			char ch = src[i];
			if (ch != ' ') {
				consecutive_spaces = 0;
				strbuf_addch(dst, ch);
			} else {
				consecutive_spaces++;
				if (consecutive_spaces == ws_tab_width(ws_rule)) {
					strbuf_addch(dst, '\t');
					consecutive_spaces = 0;
				}
			}
		}
		while (0 < consecutive_spaces--)
			strbuf_addch(dst, ' ');
		len -= last;
		src += last;
		fixed = 1;
	} else if ((ws_rule & WS_TAB_IN_INDENT) && last_tab_in_indent >= 0) {
		/* Expand tabs into spaces */
		int start = dst->len;
		int last = last_tab_in_indent + 1;
		for (i = 0; i < last; i++) {
			if (src[i] == '\t')
				do {
					strbuf_addch(dst, ' ');
				} while ((dst->len - start) % ws_tab_width(ws_rule));
			else
				strbuf_addch(dst, src[i]);
		}
		len -= last;
		src += last;
		fixed = 1;
	}

	strbuf_add(dst, src, len);
	if (add_cr_to_tail)
		strbuf_addch(dst, '\r');
	if (add_nl_to_tail)
		strbuf_addch(dst, '\n');
	if (fixed && error_count)
		(*error_count)++;
}
Commit	Line	Data
cf1b7869 JH	1	/*
	2	* Whitespace rules
	3	*
	4	* Copyright (c) 2007 Junio C Hamano
	5	*/
	6
	7	#include "cache.h"
	8	#include "attr.h"
	9
	10	static struct whitespace_rule {
	11	const char *rule_name;
	12	unsigned rule_bits;
727c3718 JH	13	unsigned loosens_error:1,
727c3718 JH	14	exclude_default:1;
cf1b7869	15	} whitespace_rule_names[] = {
a437900f JH	16	{ "trailing-space", WS_TRAILING_SPACE, 0 },
	17	{ "space-before-tab", WS_SPACE_BEFORE_TAB, 0 },
	18	{ "indent-with-non-tab", WS_INDENT_WITH_NON_TAB, 0 },
	19	{ "cr-at-eol", WS_CR_AT_EOL, 1 },
afd9db41 JH	20	{ "blank-at-eol", WS_BLANK_AT_EOL, 0 },
afd9db41 JH	21	{ "blank-at-eof", WS_BLANK_AT_EOF, 0 },
3e3ec2ab	22	{ "tab-in-indent", WS_TAB_IN_INDENT, 0, 1 },
cf1b7869 JH	23	};
	24
	25	unsigned parse_whitespace_rule(const char *string)
	26	{
	27	unsigned rule = WS_DEFAULT_RULE;
	28
	29	while (string) {
	30	int i;
	31	size_t len;
	32	const char *ep;
	33	int negated = 0;
	34
	35	string = string + strspn(string, ", \t\n\r");
2c5495f7 RM	36	ep = strchrnul(string, ',');
2c5495f7 RM	37	len = ep - string;
cf1b7869 JH	38
	39	if (*string == '-') {
	40	negated = 1;
	41	string++;
	42	len--;
	43	}
	44	if (!len)
	45	break;
	46	for (i = 0; i < ARRAY_SIZE(whitespace_rule_names); i++) {
	47	if (strncmp(whitespace_rule_names[i].rule_name,
	48	string, len))
	49	continue;
	50	if (negated)
	51	rule &= ~whitespace_rule_names[i].rule_bits;
	52	else
	53	rule \|= whitespace_rule_names[i].rule_bits;
	54	break;
	55	}
f4b05a49 JS	56	if (strncmp(string, "tabwidth=", 9) == 0) {
	57	unsigned tabwidth = atoi(string + 9);
	58	if (0 < tabwidth && tabwidth < 0100) {
	59	rule &= ~WS_TAB_WIDTH_MASK;
	60	rule \|= tabwidth;
	61	}
	62	else
	63	warning("tabwidth %.*s out of range",
	64	(int)(len - 9), string + 9);
	65	}
cf1b7869 JH	66	string = ep;
cf1b7869 JH	67	}
3e3ec2ab CW	68
	69	if (rule & WS_TAB_IN_INDENT && rule & WS_INDENT_WITH_NON_TAB)
	70	die("cannot enforce both tab-in-indent and indent-with-non-tab");
cf1b7869 JH	71	return rule;
	72	}
	73
7bd18054	74	static void setup_whitespace_attr_check(struct attr_check_item *check)
cf1b7869 JH	75	{
	76	static struct git_attr *attr_whitespace;
	77
	78	if (!attr_whitespace)
7fb0eaa2	79	attr_whitespace = git_attr("whitespace");
cf1b7869 JH	80	check[0].attr = attr_whitespace;
	81	}
	82
	83	unsigned whitespace_rule(const char *pathname)
	84	{
7bd18054	85	struct attr_check_item attr_whitespace_rule;
cf1b7869 JH	86
cf1b7869 JH	87	setup_whitespace_attr_check(&attr_whitespace_rule);
7bd18054	88	if (!git_check_attrs(pathname, 1, &attr_whitespace_rule)) {
cf1b7869 JH	89	const char *value;
	90
	91	value = attr_whitespace_rule.value;
	92	if (ATTR_TRUE(value)) {
	93	/* true (whitespace) */
f4b05a49	94	unsigned all_rule = ws_tab_width(whitespace_rule_cfg);
cf1b7869 JH	95	int i;
cf1b7869 JH	96	for (i = 0; i < ARRAY_SIZE(whitespace_rule_names); i++)
727c3718 JH	97	if (!whitespace_rule_names[i].loosens_error &&
727c3718 JH	98	!whitespace_rule_names[i].exclude_default)
a437900f	99	all_rule \|= whitespace_rule_names[i].rule_bits;
cf1b7869 JH	100	return all_rule;
	101	} else if (ATTR_FALSE(value)) {
	102	/* false (-whitespace) */
f4b05a49	103	return ws_tab_width(whitespace_rule_cfg);
cf1b7869 JH	104	} else if (ATTR_UNSET(value)) {
	105	/* reset to default (!whitespace) */
	106	return whitespace_rule_cfg;
	107	} else {
	108	/* string */
	109	return parse_whitespace_rule(value);
	110	}
	111	} else {
	112	return whitespace_rule_cfg;
	113	}
	114	}
c1795bb0 WC	115
	116	/* The returned string should be freed by the caller. */
	117	char *whitespace_error_string(unsigned ws)
	118	{
f285a2d7	119	struct strbuf err = STRBUF_INIT;
aeb84b05	120	if ((ws & WS_TRAILING_SPACE) == WS_TRAILING_SPACE)
420f4f04	121	strbuf_addstr(&err, "trailing whitespace");
aeb84b05 JH	122	else {
	123	if (ws & WS_BLANK_AT_EOL)
	124	strbuf_addstr(&err, "trailing whitespace");
	125	if (ws & WS_BLANK_AT_EOF) {
	126	if (err.len)
	127	strbuf_addstr(&err, ", ");
	128	strbuf_addstr(&err, "new blank line at EOF");
	129	}
	130	}
c1795bb0 WC	131	if (ws & WS_SPACE_BEFORE_TAB) {
	132	if (err.len)
	133	strbuf_addstr(&err, ", ");
420f4f04	134	strbuf_addstr(&err, "space before tab in indent");
c1795bb0 WC	135	}
	136	if (ws & WS_INDENT_WITH_NON_TAB) {
	137	if (err.len)
	138	strbuf_addstr(&err, ", ");
420f4f04	139	strbuf_addstr(&err, "indent with spaces");
c1795bb0	140	}
3e3ec2ab CW	141	if (ws & WS_TAB_IN_INDENT) {
	142	if (err.len)
	143	strbuf_addstr(&err, ", ");
	144	strbuf_addstr(&err, "tab in indent");
	145	}
c1795bb0 WC	146	return strbuf_detach(&err, NULL);
	147	}
	148
	149	/* If stream is non-NULL, emits the line after checking. */
8f8841e9 JH	150	static unsigned ws_check_emit_1(const char *line, int len, unsigned ws_rule,
	151	FILE stream, const char set,
	152	const char reset, const char ws)
c1795bb0 WC	153	{
c1795bb0 WC	154	unsigned result = 0;
954ecd43	155	int written = 0;
c1795bb0 WC	156	int trailing_whitespace = -1;
c1795bb0 WC	157	int trailing_newline = 0;
b2979ff5	158	int trailing_carriage_return = 0;
c1795bb0 WC	159	int i;
	160
	161	/* Logic is simpler if we temporarily ignore the trailing newline. */
	162	if (len > 0 && line[len - 1] == '\n') {
	163	trailing_newline = 1;
	164	len--;
	165	}
b2979ff5 JH	166	if ((ws_rule & WS_CR_AT_EOL) &&
	167	len > 0 && line[len - 1] == '\r') {
	168	trailing_carriage_return = 1;
	169	len--;
	170	}
c1795bb0 WC	171
c1795bb0 WC	172	/* Check for trailing whitespace. */
aeb84b05	173	if (ws_rule & WS_BLANK_AT_EOL) {
c1795bb0 WC	174	for (i = len - 1; i >= 0; i--) {
	175	if (isspace(line[i])) {
	176	trailing_whitespace = i;
aeb84b05	177	result \|= WS_BLANK_AT_EOL;
c1795bb0 WC	178	}
	179	else
	180	break;
	181	}
	182	}
	183
cfd1a984 KB	184	if (trailing_whitespace == -1)
	185	trailing_whitespace = len;
	186
3e3ec2ab	187	/* Check indentation */
cfd1a984	188	for (i = 0; i < trailing_whitespace; i++) {
9afa2d4a	189	if (line[i] == ' ')
1020999a	190	continue;
1020999a	191	if (line[i] != '\t')
c1795bb0	192	break;
ffe56885	193	if ((ws_rule & WS_SPACE_BEFORE_TAB) && written < i) {
1020999a	194	result \|= WS_SPACE_BEFORE_TAB;
ffe56885 BF	195	if (stream) {
	196	fputs(ws, stream);
	197	fwrite(line + written, i - written, 1, stream);
	198	fputs(reset, stream);
3e3ec2ab	199	fwrite(line + i, 1, 1, stream);
ffe56885	200	}
3e3ec2ab CW	201	} else if (ws_rule & WS_TAB_IN_INDENT) {
	202	result \|= WS_TAB_IN_INDENT;
	203	if (stream) {
	204	fwrite(line + written, i - written, 1, stream);
	205	fputs(ws, stream);
	206	fwrite(line + i, 1, 1, stream);
	207	fputs(reset, stream);
	208	}
	209	} else if (stream) {
	210	fwrite(line + written, i - written + 1, 1, stream);
	211	}
9afa2d4a	212	written = i + 1;
c1795bb0 WC	213	}
	214
	215	/* Check for indent using non-tab. */
f4b05a49	216	if ((ws_rule & WS_INDENT_WITH_NON_TAB) && i - written >= ws_tab_width(ws_rule)) {
c1795bb0	217	result \|= WS_INDENT_WITH_NON_TAB;
ffe56885	218	if (stream) {
c1795bb0	219	fputs(ws, stream);
ffe56885	220	fwrite(line + written, i - written, 1, stream);
c1795bb0	221	fputs(reset, stream);
c1795bb0	222	}
ffe56885 BF	223	written = i;
ffe56885 BF	224	}
c1795bb0	225
ffe56885	226	if (stream) {
b2979ff5 JH	227	/*
	228	* Now the rest of the line starts at "written".
	229	* The non-highlighted part ends at "trailing_whitespace".
	230	*/
c1795bb0 WC	231
c1795bb0 WC	232	/* Emit non-highlighted (middle) segment. */
954ecd43	233	if (trailing_whitespace - written > 0) {
c1795bb0	234	fputs(set, stream);
954ecd43 BF	235	fwrite(line + written,
954ecd43 BF	236	trailing_whitespace - written, 1, stream);
c1795bb0 WC	237	fputs(reset, stream);
	238	}
	239
	240	/* Highlight errors in trailing whitespace. */
	241	if (trailing_whitespace != len) {
	242	fputs(ws, stream);
	243	fwrite(line + trailing_whitespace,
	244	len - trailing_whitespace, 1, stream);
	245	fputs(reset, stream);
	246	}
b2979ff5 JH	247	if (trailing_carriage_return)
b2979ff5 JH	248	fputc('\r', stream);
c1795bb0 WC	249	if (trailing_newline)
	250	fputc('\n', stream);
	251	}
	252	return result;
	253	}
fe3403c3	254
8f8841e9 JH	255	void ws_check_emit(const char *line, int len, unsigned ws_rule,
	256	FILE stream, const char set,
	257	const char reset, const char ws)
	258	{
	259	(void)ws_check_emit_1(line, len, ws_rule, stream, set, reset, ws);
	260	}
	261
	262	unsigned ws_check(const char *line, int len, unsigned ws_rule)
	263	{
	264	return ws_check_emit_1(line, len, ws_rule, NULL, NULL, NULL, NULL);
	265	}
	266
877f23cc JH	267	int ws_blank_line(const char *line, int len, unsigned ws_rule)
	268	{
	269	/*
	270	* We _might_ want to treat CR differently from other
	271	* whitespace characters when ws_rule has WS_CR_AT_EOL, but
	272	* for now we just use this stupid definition.
	273	*/
	274	while (len-- > 0) {
	275	if (!isspace(*line))
	276	return 0;
	277	line++;
	278	}
	279	return 1;
	280	}
	281
d511bd33 CW	282	/* Copy the line onto the end of the strbuf while fixing whitespaces */
d511bd33 CW	283	void ws_fix_copy(struct strbuf dst, const char src, int len, unsigned ws_rule, int *error_count)
fe3403c3 JH	284	{
	285	/*
	286	* len is number of bytes to be copied from src, starting
	287	* at src. Typically src[len-1] is '\n', unless this is
	288	* the incomplete last line.
	289	*/
	290	int i;
	291	int add_nl_to_tail = 0;
	292	int add_cr_to_tail = 0;
	293	int fixed = 0;
	294	int last_tab_in_indent = -1;
	295	int last_space_in_indent = -1;
	296	int need_fix_leading_space = 0;
fe3403c3 JH	297
	298	/*
	299	* Strip trailing whitespace
	300	*/
afd9db41	301	if (ws_rule & WS_BLANK_AT_EOL) {
422a82f2	302	if (0 < len && src[len - 1] == '\n') {
fe3403c3 JH	303	add_nl_to_tail = 1;
fe3403c3 JH	304	len--;
422a82f2	305	if (0 < len && src[len - 1] == '\r') {
fe3403c3 JH	306	add_cr_to_tail = !!(ws_rule & WS_CR_AT_EOL);
	307	len--;
	308	}
	309	}
	310	if (0 < len && isspace(src[len - 1])) {
	311	while (0 < len && isspace(src[len-1]))
	312	len--;
	313	fixed = 1;
	314	}
	315	}
	316
	317	/*
	318	* Check leading whitespaces (indent)
	319	*/
	320	for (i = 0; i < len; i++) {
	321	char ch = src[i];
	322	if (ch == '\t') {
	323	last_tab_in_indent = i;
	324	if ((ws_rule & WS_SPACE_BEFORE_TAB) &&
	325	0 <= last_space_in_indent)
	326	need_fix_leading_space = 1;
	327	} else if (ch == ' ') {
	328	last_space_in_indent = i;
	329	if ((ws_rule & WS_INDENT_WITH_NON_TAB) &&
f4b05a49	330	ws_tab_width(ws_rule) <= i - last_tab_in_indent)
fe3403c3 JH	331	need_fix_leading_space = 1;
	332	} else
	333	break;
	334	}
	335
fe3403c3 JH	336	if (need_fix_leading_space) {
	337	/* Process indent ourselves */
	338	int consecutive_spaces = 0;
	339	int last = last_tab_in_indent + 1;
	340
	341	if (ws_rule & WS_INDENT_WITH_NON_TAB) {
	342	/* have "last" point at one past the indent */
	343	if (last_tab_in_indent < last_space_in_indent)
	344	last = last_space_in_indent + 1;
	345	else
	346	last = last_tab_in_indent + 1;
	347	}
	348
	349	/*
	350	* between src[0..last-1], strip the funny spaces,
	351	* updating them to tab as needed.
	352	*/
	353	for (i = 0; i < last; i++) {
	354	char ch = src[i];
	355	if (ch != ' ') {
	356	consecutive_spaces = 0;
d511bd33	357	strbuf_addch(dst, ch);
fe3403c3 JH	358	} else {
fe3403c3 JH	359	consecutive_spaces++;
f4b05a49	360	if (consecutive_spaces == ws_tab_width(ws_rule)) {
d511bd33	361	strbuf_addch(dst, '\t');
fe3403c3 JH	362	consecutive_spaces = 0;
	363	}
	364	}
	365	}
	366	while (0 < consecutive_spaces--)
d511bd33	367	strbuf_addch(dst, ' ');
fe3403c3 JH	368	len -= last;
	369	src += last;
	370	fixed = 1;
4e35c51e CW	371	} else if ((ws_rule & WS_TAB_IN_INDENT) && last_tab_in_indent >= 0) {
4e35c51e CW	372	/* Expand tabs into spaces */
d35711ad	373	int start = dst->len;
4e35c51e CW	374	int last = last_tab_in_indent + 1;
	375	for (i = 0; i < last; i++) {
	376	if (src[i] == '\t')
	377	do {
	378	strbuf_addch(dst, ' ');
f4b05a49	379	} while ((dst->len - start) % ws_tab_width(ws_rule));
4e35c51e CW	380	else
	381	strbuf_addch(dst, src[i]);
	382	}
	383	len -= last;
	384	src += last;
	385	fixed = 1;
fe3403c3 JH	386	}
fe3403c3 JH	387
d511bd33	388	strbuf_add(dst, src, len);
fe3403c3	389	if (add_cr_to_tail)
d511bd33	390	strbuf_addch(dst, '\r');
fe3403c3	391	if (add_nl_to_tail)
d511bd33	392	strbuf_addch(dst, '\n');
fe3403c3 JH	393	if (fixed && error_count)
fe3403c3 JH	394	(*error_count)++;
fe3403c3	395	}