[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;
		const char *arg;
		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 (skip_prefix(string, "tabwidth=", &arg)) {
			unsigned tabwidth = atoi(arg);
			if (0 < tabwidth && tabwidth < 0100) {
				rule &= ~WS_TAB_WIDTH_MASK;
				rule |= tabwidth;
			}
			else
				warning("tabwidth %.*s out of range",
					(int)(ep - arg), arg);
		}
		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, NULL, 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)
{
	/*
	 * 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;
d43b9932	32	const char *arg;
cf1b7869 JH	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	}
d43b9932 JK	56	if (skip_prefix(string, "tabwidth=", &arg)) {
d43b9932 JK	57	unsigned tabwidth = atoi(arg);
f4b05a49 JS	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",
d43b9932	64	(int)(ep - arg), arg);
f4b05a49	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
26d024ec	74	unsigned whitespace_rule(struct index_state istate, const char pathname)
cf1b7869	75	{
2aef63d3	76	static struct attr_check *attr_whitespace_rule;
d64324cb	77	const char *value;
2aef63d3 JH	78
	79	if (!attr_whitespace_rule)
	80	attr_whitespace_rule = attr_check_initl("whitespace", NULL);
cf1b7869	81
47cfc9bd	82	git_check_attr(istate, NULL, pathname, attr_whitespace_rule);
d64324cb TB	83	value = attr_whitespace_rule->items[0].value;
	84	if (ATTR_TRUE(value)) {
	85	/* true (whitespace) */
	86	unsigned all_rule = ws_tab_width(whitespace_rule_cfg);
	87	int i;
	88	for (i = 0; i < ARRAY_SIZE(whitespace_rule_names); i++)
	89	if (!whitespace_rule_names[i].loosens_error &&
	90	!whitespace_rule_names[i].exclude_default)
	91	all_rule \|= whitespace_rule_names[i].rule_bits;
	92	return all_rule;
	93	} else if (ATTR_FALSE(value)) {
	94	/* false (-whitespace) */
	95	return ws_tab_width(whitespace_rule_cfg);
	96	} else if (ATTR_UNSET(value)) {
	97	/* reset to default (!whitespace) */
cf1b7869	98	return whitespace_rule_cfg;
d64324cb TB	99	} else {
	100	/* string */
	101	return parse_whitespace_rule(value);
cf1b7869 JH	102	}
cf1b7869 JH	103	}
c1795bb0 WC	104
	105	/* The returned string should be freed by the caller. */
	106	char *whitespace_error_string(unsigned ws)
	107	{
f285a2d7	108	struct strbuf err = STRBUF_INIT;
aeb84b05	109	if ((ws & WS_TRAILING_SPACE) == WS_TRAILING_SPACE)
420f4f04	110	strbuf_addstr(&err, "trailing whitespace");
aeb84b05 JH	111	else {
	112	if (ws & WS_BLANK_AT_EOL)
	113	strbuf_addstr(&err, "trailing whitespace");
	114	if (ws & WS_BLANK_AT_EOF) {
	115	if (err.len)
	116	strbuf_addstr(&err, ", ");
	117	strbuf_addstr(&err, "new blank line at EOF");
	118	}
	119	}
c1795bb0 WC	120	if (ws & WS_SPACE_BEFORE_TAB) {
	121	if (err.len)
	122	strbuf_addstr(&err, ", ");
420f4f04	123	strbuf_addstr(&err, "space before tab in indent");
c1795bb0 WC	124	}
	125	if (ws & WS_INDENT_WITH_NON_TAB) {
	126	if (err.len)
	127	strbuf_addstr(&err, ", ");
420f4f04	128	strbuf_addstr(&err, "indent with spaces");
c1795bb0	129	}
3e3ec2ab CW	130	if (ws & WS_TAB_IN_INDENT) {
	131	if (err.len)
	132	strbuf_addstr(&err, ", ");
	133	strbuf_addstr(&err, "tab in indent");
	134	}
c1795bb0 WC	135	return strbuf_detach(&err, NULL);
	136	}
	137
	138	/* If stream is non-NULL, emits the line after checking. */
8f8841e9 JH	139	static unsigned ws_check_emit_1(const char *line, int len, unsigned ws_rule,
	140	FILE stream, const char set,
	141	const char reset, const char ws)
c1795bb0 WC	142	{
c1795bb0 WC	143	unsigned result = 0;
954ecd43	144	int written = 0;
c1795bb0 WC	145	int trailing_whitespace = -1;
c1795bb0 WC	146	int trailing_newline = 0;
b2979ff5	147	int trailing_carriage_return = 0;
c1795bb0 WC	148	int i;
	149
	150	/* Logic is simpler if we temporarily ignore the trailing newline. */
	151	if (len > 0 && line[len - 1] == '\n') {
	152	trailing_newline = 1;
	153	len--;
	154	}
b2979ff5 JH	155	if ((ws_rule & WS_CR_AT_EOL) &&
	156	len > 0 && line[len - 1] == '\r') {
	157	trailing_carriage_return = 1;
	158	len--;
	159	}
c1795bb0 WC	160
c1795bb0 WC	161	/* Check for trailing whitespace. */
aeb84b05	162	if (ws_rule & WS_BLANK_AT_EOL) {
c1795bb0 WC	163	for (i = len - 1; i >= 0; i--) {
	164	if (isspace(line[i])) {
	165	trailing_whitespace = i;
aeb84b05	166	result \|= WS_BLANK_AT_EOL;
c1795bb0 WC	167	}
	168	else
	169	break;
	170	}
	171	}
	172
cfd1a984 KB	173	if (trailing_whitespace == -1)
	174	trailing_whitespace = len;
	175
3e3ec2ab	176	/* Check indentation */
cfd1a984	177	for (i = 0; i < trailing_whitespace; i++) {
9afa2d4a	178	if (line[i] == ' ')
1020999a	179	continue;
1020999a	180	if (line[i] != '\t')
c1795bb0	181	break;
ffe56885	182	if ((ws_rule & WS_SPACE_BEFORE_TAB) && written < i) {
1020999a	183	result \|= WS_SPACE_BEFORE_TAB;
ffe56885 BF	184	if (stream) {
	185	fputs(ws, stream);
	186	fwrite(line + written, i - written, 1, stream);
	187	fputs(reset, stream);
3e3ec2ab	188	fwrite(line + i, 1, 1, stream);
ffe56885	189	}
3e3ec2ab CW	190	} else if (ws_rule & WS_TAB_IN_INDENT) {
	191	result \|= WS_TAB_IN_INDENT;
	192	if (stream) {
	193	fwrite(line + written, i - written, 1, stream);
	194	fputs(ws, stream);
	195	fwrite(line + i, 1, 1, stream);
	196	fputs(reset, stream);
	197	}
	198	} else if (stream) {
	199	fwrite(line + written, i - written + 1, 1, stream);
	200	}
9afa2d4a	201	written = i + 1;
c1795bb0 WC	202	}
	203
	204	/* Check for indent using non-tab. */
f4b05a49	205	if ((ws_rule & WS_INDENT_WITH_NON_TAB) && i - written >= ws_tab_width(ws_rule)) {
c1795bb0	206	result \|= WS_INDENT_WITH_NON_TAB;
ffe56885	207	if (stream) {
c1795bb0	208	fputs(ws, stream);
ffe56885	209	fwrite(line + written, i - written, 1, stream);
c1795bb0	210	fputs(reset, stream);
c1795bb0	211	}
ffe56885 BF	212	written = i;
ffe56885 BF	213	}
c1795bb0	214
ffe56885	215	if (stream) {
b2979ff5 JH	216	/*
	217	* Now the rest of the line starts at "written".
	218	* The non-highlighted part ends at "trailing_whitespace".
	219	*/
c1795bb0 WC	220
c1795bb0 WC	221	/* Emit non-highlighted (middle) segment. */
954ecd43	222	if (trailing_whitespace - written > 0) {
c1795bb0	223	fputs(set, stream);
954ecd43 BF	224	fwrite(line + written,
954ecd43 BF	225	trailing_whitespace - written, 1, stream);
c1795bb0 WC	226	fputs(reset, stream);
	227	}
	228
	229	/* Highlight errors in trailing whitespace. */
	230	if (trailing_whitespace != len) {
	231	fputs(ws, stream);
	232	fwrite(line + trailing_whitespace,
	233	len - trailing_whitespace, 1, stream);
	234	fputs(reset, stream);
	235	}
b2979ff5 JH	236	if (trailing_carriage_return)
b2979ff5 JH	237	fputc('\r', stream);
c1795bb0 WC	238	if (trailing_newline)
	239	fputc('\n', stream);
	240	}
	241	return result;
	242	}
fe3403c3	243
8f8841e9 JH	244	void ws_check_emit(const char *line, int len, unsigned ws_rule,
	245	FILE stream, const char set,
	246	const char reset, const char ws)
	247	{
	248	(void)ws_check_emit_1(line, len, ws_rule, stream, set, reset, ws);
	249	}
	250
	251	unsigned ws_check(const char *line, int len, unsigned ws_rule)
	252	{
	253	return ws_check_emit_1(line, len, ws_rule, NULL, NULL, NULL, NULL);
	254	}
	255
c5224f0f	256	int ws_blank_line(const char *line, int len)
877f23cc JH	257	{
	258	/*
	259	* We _might_ want to treat CR differently from other
	260	* whitespace characters when ws_rule has WS_CR_AT_EOL, but
	261	* for now we just use this stupid definition.
	262	*/
	263	while (len-- > 0) {
	264	if (!isspace(*line))
	265	return 0;
	266	line++;
	267	}
	268	return 1;
	269	}
	270
d511bd33 CW	271	/* Copy the line onto the end of the strbuf while fixing whitespaces */
d511bd33 CW	272	void ws_fix_copy(struct strbuf dst, const char src, int len, unsigned ws_rule, int *error_count)
fe3403c3 JH	273	{
	274	/*
	275	* len is number of bytes to be copied from src, starting
	276	* at src. Typically src[len-1] is '\n', unless this is
	277	* the incomplete last line.
	278	*/
	279	int i;
	280	int add_nl_to_tail = 0;
	281	int add_cr_to_tail = 0;
	282	int fixed = 0;
	283	int last_tab_in_indent = -1;
	284	int last_space_in_indent = -1;
	285	int need_fix_leading_space = 0;
fe3403c3 JH	286
	287	/*
	288	* Strip trailing whitespace
	289	*/
afd9db41	290	if (ws_rule & WS_BLANK_AT_EOL) {
422a82f2	291	if (0 < len && src[len - 1] == '\n') {
fe3403c3 JH	292	add_nl_to_tail = 1;
fe3403c3 JH	293	len--;
422a82f2	294	if (0 < len && src[len - 1] == '\r') {
fe3403c3 JH	295	add_cr_to_tail = !!(ws_rule & WS_CR_AT_EOL);
	296	len--;
	297	}
	298	}
	299	if (0 < len && isspace(src[len - 1])) {
	300	while (0 < len && isspace(src[len-1]))
	301	len--;
	302	fixed = 1;
	303	}
	304	}
	305
	306	/*
	307	* Check leading whitespaces (indent)
	308	*/
	309	for (i = 0; i < len; i++) {
	310	char ch = src[i];
	311	if (ch == '\t') {
	312	last_tab_in_indent = i;
	313	if ((ws_rule & WS_SPACE_BEFORE_TAB) &&
	314	0 <= last_space_in_indent)
	315	need_fix_leading_space = 1;
	316	} else if (ch == ' ') {
	317	last_space_in_indent = i;
	318	if ((ws_rule & WS_INDENT_WITH_NON_TAB) &&
f4b05a49	319	ws_tab_width(ws_rule) <= i - last_tab_in_indent)
fe3403c3 JH	320	need_fix_leading_space = 1;
	321	} else
	322	break;
	323	}
	324
fe3403c3 JH	325	if (need_fix_leading_space) {
	326	/* Process indent ourselves */
	327	int consecutive_spaces = 0;
	328	int last = last_tab_in_indent + 1;
	329
	330	if (ws_rule & WS_INDENT_WITH_NON_TAB) {
	331	/* have "last" point at one past the indent */
	332	if (last_tab_in_indent < last_space_in_indent)
	333	last = last_space_in_indent + 1;
	334	else
	335	last = last_tab_in_indent + 1;
	336	}
	337
	338	/*
	339	* between src[0..last-1], strip the funny spaces,
	340	* updating them to tab as needed.
	341	*/
	342	for (i = 0; i < last; i++) {
	343	char ch = src[i];
	344	if (ch != ' ') {
	345	consecutive_spaces = 0;
d511bd33	346	strbuf_addch(dst, ch);
fe3403c3 JH	347	} else {
fe3403c3 JH	348	consecutive_spaces++;
f4b05a49	349	if (consecutive_spaces == ws_tab_width(ws_rule)) {
d511bd33	350	strbuf_addch(dst, '\t');
fe3403c3 JH	351	consecutive_spaces = 0;
	352	}
	353	}
	354	}
	355	while (0 < consecutive_spaces--)
d511bd33	356	strbuf_addch(dst, ' ');
fe3403c3 JH	357	len -= last;
	358	src += last;
	359	fixed = 1;
4e35c51e CW	360	} else if ((ws_rule & WS_TAB_IN_INDENT) && last_tab_in_indent >= 0) {
4e35c51e CW	361	/* Expand tabs into spaces */
d35711ad	362	int start = dst->len;
4e35c51e CW	363	int last = last_tab_in_indent + 1;
	364	for (i = 0; i < last; i++) {
	365	if (src[i] == '\t')
	366	do {
	367	strbuf_addch(dst, ' ');
f4b05a49	368	} while ((dst->len - start) % ws_tab_width(ws_rule));
4e35c51e CW	369	else
	370	strbuf_addch(dst, src[i]);
	371	}
	372	len -= last;
	373	src += last;
	374	fixed = 1;
fe3403c3 JH	375	}
fe3403c3 JH	376
d511bd33	377	strbuf_add(dst, src, len);
fe3403c3	378	if (add_cr_to_tail)
d511bd33	379	strbuf_addch(dst, '\r');
fe3403c3	380	if (add_nl_to_tail)
d511bd33	381	strbuf_addch(dst, '\n');
fe3403c3 JH	382	if (fixed && error_count)
fe3403c3 JH	383	(*error_count)++;
fe3403c3	384	}