[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;
}

unsigned whitespace_rule(struct index_state *istate, const char *pathname)
{
	static struct attr_check *attr_whitespace_rule;
	const char *value;

	if (!attr_whitespace_rule)
		attr_whitespace_rule = attr_check_initl("whitespace", NULL);

	git_check_attr(istate, pathname, attr_whitespace_rule);
	value = attr_whitespace_rule->items[0].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);
	}
}

/* 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	*/
cf1b7869 JH	6	#include "cache.h"
	7	#include "attr.h"
	8
	9	static struct whitespace_rule {
	10	const char *rule_name;
	11	unsigned rule_bits;
727c3718 JH	12	unsigned loosens_error:1,
727c3718 JH	13	exclude_default:1;
cf1b7869	14	} whitespace_rule_names[] = {
a437900f JH	15	{ "trailing-space", WS_TRAILING_SPACE, 0 },
	16	{ "space-before-tab", WS_SPACE_BEFORE_TAB, 0 },
	17	{ "indent-with-non-tab", WS_INDENT_WITH_NON_TAB, 0 },
	18	{ "cr-at-eol", WS_CR_AT_EOL, 1 },
afd9db41 JH	19	{ "blank-at-eol", WS_BLANK_AT_EOL, 0 },
afd9db41 JH	20	{ "blank-at-eof", WS_BLANK_AT_EOF, 0 },
3e3ec2ab	21	{ "tab-in-indent", WS_TAB_IN_INDENT, 0, 1 },
cf1b7869 JH	22	};
	23
	24	unsigned parse_whitespace_rule(const char *string)
	25	{
	26	unsigned rule = WS_DEFAULT_RULE;
	27
	28	while (string) {
	29	int i;
	30	size_t len;
	31	const char *ep;
	32	int negated = 0;
	33
	34	string = string + strspn(string, ", \t\n\r");
2c5495f7 RM	35	ep = strchrnul(string, ',');
2c5495f7 RM	36	len = ep - string;
cf1b7869 JH	37
	38	if (*string == '-') {
	39	negated = 1;
	40	string++;
	41	len--;
	42	}
	43	if (!len)
	44	break;
	45	for (i = 0; i < ARRAY_SIZE(whitespace_rule_names); i++) {
	46	if (strncmp(whitespace_rule_names[i].rule_name,
	47	string, len))
	48	continue;
	49	if (negated)
	50	rule &= ~whitespace_rule_names[i].rule_bits;
	51	else
	52	rule \|= whitespace_rule_names[i].rule_bits;
	53	break;
	54	}
f4b05a49 JS	55	if (strncmp(string, "tabwidth=", 9) == 0) {
	56	unsigned tabwidth = atoi(string + 9);
	57	if (0 < tabwidth && tabwidth < 0100) {
	58	rule &= ~WS_TAB_WIDTH_MASK;
	59	rule \|= tabwidth;
	60	}
	61	else
	62	warning("tabwidth %.*s out of range",
	63	(int)(len - 9), string + 9);
	64	}
cf1b7869 JH	65	string = ep;
cf1b7869 JH	66	}
3e3ec2ab CW	67
	68	if (rule & WS_TAB_IN_INDENT && rule & WS_INDENT_WITH_NON_TAB)
	69	die("cannot enforce both tab-in-indent and indent-with-non-tab");
cf1b7869 JH	70	return rule;
	71	}
	72
26d024ec	73	unsigned whitespace_rule(struct index_state istate, const char pathname)
cf1b7869	74	{
2aef63d3	75	static struct attr_check *attr_whitespace_rule;
d64324cb	76	const char *value;
2aef63d3 JH	77
	78	if (!attr_whitespace_rule)
	79	attr_whitespace_rule = attr_check_initl("whitespace", NULL);
cf1b7869	80
11877b9e	81	git_check_attr(istate, pathname, attr_whitespace_rule);
d64324cb TB	82	value = attr_whitespace_rule->items[0].value;
	83	if (ATTR_TRUE(value)) {
	84	/* true (whitespace) */
	85	unsigned all_rule = ws_tab_width(whitespace_rule_cfg);
	86	int i;
	87	for (i = 0; i < ARRAY_SIZE(whitespace_rule_names); i++)
	88	if (!whitespace_rule_names[i].loosens_error &&
	89	!whitespace_rule_names[i].exclude_default)
	90	all_rule \|= whitespace_rule_names[i].rule_bits;
	91	return all_rule;
	92	} else if (ATTR_FALSE(value)) {
	93	/* false (-whitespace) */
	94	return ws_tab_width(whitespace_rule_cfg);
	95	} else if (ATTR_UNSET(value)) {
	96	/* reset to default (!whitespace) */
cf1b7869	97	return whitespace_rule_cfg;
d64324cb TB	98	} else {
	99	/* string */
	100	return parse_whitespace_rule(value);
cf1b7869 JH	101	}
cf1b7869 JH	102	}
c1795bb0 WC	103
	104	/* The returned string should be freed by the caller. */
	105	char *whitespace_error_string(unsigned ws)
	106	{
f285a2d7	107	struct strbuf err = STRBUF_INIT;
aeb84b05	108	if ((ws & WS_TRAILING_SPACE) == WS_TRAILING_SPACE)
420f4f04	109	strbuf_addstr(&err, "trailing whitespace");
aeb84b05 JH	110	else {
	111	if (ws & WS_BLANK_AT_EOL)
	112	strbuf_addstr(&err, "trailing whitespace");
	113	if (ws & WS_BLANK_AT_EOF) {
	114	if (err.len)
	115	strbuf_addstr(&err, ", ");
	116	strbuf_addstr(&err, "new blank line at EOF");
	117	}
	118	}
c1795bb0 WC	119	if (ws & WS_SPACE_BEFORE_TAB) {
	120	if (err.len)
	121	strbuf_addstr(&err, ", ");
420f4f04	122	strbuf_addstr(&err, "space before tab in indent");
c1795bb0 WC	123	}
	124	if (ws & WS_INDENT_WITH_NON_TAB) {
	125	if (err.len)
	126	strbuf_addstr(&err, ", ");
420f4f04	127	strbuf_addstr(&err, "indent with spaces");
c1795bb0	128	}
3e3ec2ab CW	129	if (ws & WS_TAB_IN_INDENT) {
	130	if (err.len)
	131	strbuf_addstr(&err, ", ");
	132	strbuf_addstr(&err, "tab in indent");
	133	}
c1795bb0 WC	134	return strbuf_detach(&err, NULL);
	135	}
	136
	137	/* If stream is non-NULL, emits the line after checking. */
8f8841e9 JH	138	static unsigned ws_check_emit_1(const char *line, int len, unsigned ws_rule,
	139	FILE stream, const char set,
	140	const char reset, const char ws)
c1795bb0 WC	141	{
c1795bb0 WC	142	unsigned result = 0;
954ecd43	143	int written = 0;
c1795bb0 WC	144	int trailing_whitespace = -1;
c1795bb0 WC	145	int trailing_newline = 0;
b2979ff5	146	int trailing_carriage_return = 0;
c1795bb0 WC	147	int i;
	148
	149	/* Logic is simpler if we temporarily ignore the trailing newline. */
	150	if (len > 0 && line[len - 1] == '\n') {
	151	trailing_newline = 1;
	152	len--;
	153	}
b2979ff5 JH	154	if ((ws_rule & WS_CR_AT_EOL) &&
	155	len > 0 && line[len - 1] == '\r') {
	156	trailing_carriage_return = 1;
	157	len--;
	158	}
c1795bb0 WC	159
c1795bb0 WC	160	/* Check for trailing whitespace. */
aeb84b05	161	if (ws_rule & WS_BLANK_AT_EOL) {
c1795bb0 WC	162	for (i = len - 1; i >= 0; i--) {
	163	if (isspace(line[i])) {
	164	trailing_whitespace = i;
aeb84b05	165	result \|= WS_BLANK_AT_EOL;
c1795bb0 WC	166	}
	167	else
	168	break;
	169	}
	170	}
	171
cfd1a984 KB	172	if (trailing_whitespace == -1)
	173	trailing_whitespace = len;
	174
3e3ec2ab	175	/* Check indentation */
cfd1a984	176	for (i = 0; i < trailing_whitespace; i++) {
9afa2d4a	177	if (line[i] == ' ')
1020999a	178	continue;
1020999a	179	if (line[i] != '\t')
c1795bb0	180	break;
ffe56885	181	if ((ws_rule & WS_SPACE_BEFORE_TAB) && written < i) {
1020999a	182	result \|= WS_SPACE_BEFORE_TAB;
ffe56885 BF	183	if (stream) {
	184	fputs(ws, stream);
	185	fwrite(line + written, i - written, 1, stream);
	186	fputs(reset, stream);
3e3ec2ab	187	fwrite(line + i, 1, 1, stream);
ffe56885	188	}
3e3ec2ab CW	189	} else if (ws_rule & WS_TAB_IN_INDENT) {
	190	result \|= WS_TAB_IN_INDENT;
	191	if (stream) {
	192	fwrite(line + written, i - written, 1, stream);
	193	fputs(ws, stream);
	194	fwrite(line + i, 1, 1, stream);
	195	fputs(reset, stream);
	196	}
	197	} else if (stream) {
	198	fwrite(line + written, i - written + 1, 1, stream);
	199	}
9afa2d4a	200	written = i + 1;
c1795bb0 WC	201	}
	202
	203	/* Check for indent using non-tab. */
f4b05a49	204	if ((ws_rule & WS_INDENT_WITH_NON_TAB) && i - written >= ws_tab_width(ws_rule)) {
c1795bb0	205	result \|= WS_INDENT_WITH_NON_TAB;
ffe56885	206	if (stream) {
c1795bb0	207	fputs(ws, stream);
ffe56885	208	fwrite(line + written, i - written, 1, stream);
c1795bb0	209	fputs(reset, stream);
c1795bb0	210	}
ffe56885 BF	211	written = i;
ffe56885 BF	212	}
c1795bb0	213
ffe56885	214	if (stream) {
b2979ff5 JH	215	/*
	216	* Now the rest of the line starts at "written".
	217	* The non-highlighted part ends at "trailing_whitespace".
	218	*/
c1795bb0 WC	219
c1795bb0 WC	220	/* Emit non-highlighted (middle) segment. */
954ecd43	221	if (trailing_whitespace - written > 0) {
c1795bb0	222	fputs(set, stream);
954ecd43 BF	223	fwrite(line + written,
954ecd43 BF	224	trailing_whitespace - written, 1, stream);
c1795bb0 WC	225	fputs(reset, stream);
	226	}
	227
	228	/* Highlight errors in trailing whitespace. */
	229	if (trailing_whitespace != len) {
	230	fputs(ws, stream);
	231	fwrite(line + trailing_whitespace,
	232	len - trailing_whitespace, 1, stream);
	233	fputs(reset, stream);
	234	}
b2979ff5 JH	235	if (trailing_carriage_return)
b2979ff5 JH	236	fputc('\r', stream);
c1795bb0 WC	237	if (trailing_newline)
	238	fputc('\n', stream);
	239	}
	240	return result;
	241	}
fe3403c3	242
8f8841e9 JH	243	void ws_check_emit(const char *line, int len, unsigned ws_rule,
	244	FILE stream, const char set,
	245	const char reset, const char ws)
	246	{
	247	(void)ws_check_emit_1(line, len, ws_rule, stream, set, reset, ws);
	248	}
	249
	250	unsigned ws_check(const char *line, int len, unsigned ws_rule)
	251	{
	252	return ws_check_emit_1(line, len, ws_rule, NULL, NULL, NULL, NULL);
	253	}
	254
877f23cc JH	255	int ws_blank_line(const char *line, int len, unsigned ws_rule)
	256	{
	257	/*
	258	* We _might_ want to treat CR differently from other
	259	* whitespace characters when ws_rule has WS_CR_AT_EOL, but
	260	* for now we just use this stupid definition.
	261	*/
	262	while (len-- > 0) {
	263	if (!isspace(*line))
	264	return 0;
	265	line++;
	266	}
	267	return 1;
	268	}
	269
d511bd33 CW	270	/* Copy the line onto the end of the strbuf while fixing whitespaces */
d511bd33 CW	271	void ws_fix_copy(struct strbuf dst, const char src, int len, unsigned ws_rule, int *error_count)
fe3403c3 JH	272	{
	273	/*
	274	* len is number of bytes to be copied from src, starting
	275	* at src. Typically src[len-1] is '\n', unless this is
	276	* the incomplete last line.
	277	*/
	278	int i;
	279	int add_nl_to_tail = 0;
	280	int add_cr_to_tail = 0;
	281	int fixed = 0;
	282	int last_tab_in_indent = -1;
	283	int last_space_in_indent = -1;
	284	int need_fix_leading_space = 0;
fe3403c3 JH	285
	286	/*
	287	* Strip trailing whitespace
	288	*/
afd9db41	289	if (ws_rule & WS_BLANK_AT_EOL) {
422a82f2	290	if (0 < len && src[len - 1] == '\n') {
fe3403c3 JH	291	add_nl_to_tail = 1;
fe3403c3 JH	292	len--;
422a82f2	293	if (0 < len && src[len - 1] == '\r') {
fe3403c3 JH	294	add_cr_to_tail = !!(ws_rule & WS_CR_AT_EOL);
	295	len--;
	296	}
	297	}
	298	if (0 < len && isspace(src[len - 1])) {
	299	while (0 < len && isspace(src[len-1]))
	300	len--;
	301	fixed = 1;
	302	}
	303	}
	304
	305	/*
	306	* Check leading whitespaces (indent)
	307	*/
	308	for (i = 0; i < len; i++) {
	309	char ch = src[i];
	310	if (ch == '\t') {
	311	last_tab_in_indent = i;
	312	if ((ws_rule & WS_SPACE_BEFORE_TAB) &&
	313	0 <= last_space_in_indent)
	314	need_fix_leading_space = 1;
	315	} else if (ch == ' ') {
	316	last_space_in_indent = i;
	317	if ((ws_rule & WS_INDENT_WITH_NON_TAB) &&
f4b05a49	318	ws_tab_width(ws_rule) <= i - last_tab_in_indent)
fe3403c3 JH	319	need_fix_leading_space = 1;
	320	} else
	321	break;
	322	}
	323
fe3403c3 JH	324	if (need_fix_leading_space) {
	325	/* Process indent ourselves */
	326	int consecutive_spaces = 0;
	327	int last = last_tab_in_indent + 1;
	328
	329	if (ws_rule & WS_INDENT_WITH_NON_TAB) {
	330	/* have "last" point at one past the indent */
	331	if (last_tab_in_indent < last_space_in_indent)
	332	last = last_space_in_indent + 1;
	333	else
	334	last = last_tab_in_indent + 1;
	335	}
	336
	337	/*
	338	* between src[0..last-1], strip the funny spaces,
	339	* updating them to tab as needed.
	340	*/
	341	for (i = 0; i < last; i++) {
	342	char ch = src[i];
	343	if (ch != ' ') {
	344	consecutive_spaces = 0;
d511bd33	345	strbuf_addch(dst, ch);
fe3403c3 JH	346	} else {
fe3403c3 JH	347	consecutive_spaces++;
f4b05a49	348	if (consecutive_spaces == ws_tab_width(ws_rule)) {
d511bd33	349	strbuf_addch(dst, '\t');
fe3403c3 JH	350	consecutive_spaces = 0;
	351	}
	352	}
	353	}
	354	while (0 < consecutive_spaces--)
d511bd33	355	strbuf_addch(dst, ' ');
fe3403c3 JH	356	len -= last;
	357	src += last;
	358	fixed = 1;
4e35c51e CW	359	} else if ((ws_rule & WS_TAB_IN_INDENT) && last_tab_in_indent >= 0) {
4e35c51e CW	360	/* Expand tabs into spaces */
d35711ad	361	int start = dst->len;
4e35c51e CW	362	int last = last_tab_in_indent + 1;
	363	for (i = 0; i < last; i++) {
	364	if (src[i] == '\t')
	365	do {
	366	strbuf_addch(dst, ' ');
f4b05a49	367	} while ((dst->len - start) % ws_tab_width(ws_rule));
4e35c51e CW	368	else
	369	strbuf_addch(dst, src[i]);
	370	}
	371	len -= last;
	372	src += last;
	373	fixed = 1;
fe3403c3 JH	374	}
fe3403c3 JH	375
d511bd33	376	strbuf_add(dst, src, len);
fe3403c3	377	if (add_cr_to_tail)
d511bd33	378	strbuf_addch(dst, '\r');
fe3403c3	379	if (add_nl_to_tail)
d511bd33	380	strbuf_addch(dst, '\n');
fe3403c3 JH	381	if (fixed && error_count)
fe3403c3 JH	382	(*error_count)++;
fe3403c3	383	}