[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 = strchr(string, ',');
		if (!ep)
			len = strlen(string);
		else
			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 git_attr_check *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 git_attr_check attr_whitespace_rule;

	setup_whitespace_attr_check(&attr_whitespace_rule);
	if (!git_checkattr(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");
	36	ep = strchr(string, ',');
	37	if (!ep)
	38	len = strlen(string);
	39	else
	40	len = ep - string;
	41
	42	if (*string == '-') {
	43	negated = 1;
	44	string++;
	45	len--;
	46	}
	47	if (!len)
	48	break;
	49	for (i = 0; i < ARRAY_SIZE(whitespace_rule_names); i++) {
	50	if (strncmp(whitespace_rule_names[i].rule_name,
	51	string, len))
	52	continue;
	53	if (negated)
	54	rule &= ~whitespace_rule_names[i].rule_bits;
	55	else
	56	rule \|= whitespace_rule_names[i].rule_bits;
	57	break;
	58	}
f4b05a49 JS	59	if (strncmp(string, "tabwidth=", 9) == 0) {
	60	unsigned tabwidth = atoi(string + 9);
	61	if (0 < tabwidth && tabwidth < 0100) {
	62	rule &= ~WS_TAB_WIDTH_MASK;
	63	rule \|= tabwidth;
	64	}
	65	else
	66	warning("tabwidth %.*s out of range",
	67	(int)(len - 9), string + 9);
	68	}
cf1b7869 JH	69	string = ep;
cf1b7869 JH	70	}
3e3ec2ab CW	71
	72	if (rule & WS_TAB_IN_INDENT && rule & WS_INDENT_WITH_NON_TAB)
	73	die("cannot enforce both tab-in-indent and indent-with-non-tab");
cf1b7869 JH	74	return rule;
	75	}
	76
	77	static void setup_whitespace_attr_check(struct git_attr_check *check)
	78	{
	79	static struct git_attr *attr_whitespace;
	80
	81	if (!attr_whitespace)
7fb0eaa2	82	attr_whitespace = git_attr("whitespace");
cf1b7869 JH	83	check[0].attr = attr_whitespace;
	84	}
	85
	86	unsigned whitespace_rule(const char *pathname)
	87	{
	88	struct git_attr_check attr_whitespace_rule;
	89
	90	setup_whitespace_attr_check(&attr_whitespace_rule);
	91	if (!git_checkattr(pathname, 1, &attr_whitespace_rule)) {
	92	const char *value;
	93
	94	value = attr_whitespace_rule.value;
	95	if (ATTR_TRUE(value)) {
	96	/* true (whitespace) */
f4b05a49	97	unsigned all_rule = ws_tab_width(whitespace_rule_cfg);
cf1b7869 JH	98	int i;
cf1b7869 JH	99	for (i = 0; i < ARRAY_SIZE(whitespace_rule_names); i++)
727c3718 JH	100	if (!whitespace_rule_names[i].loosens_error &&
727c3718 JH	101	!whitespace_rule_names[i].exclude_default)
a437900f	102	all_rule \|= whitespace_rule_names[i].rule_bits;
cf1b7869 JH	103	return all_rule;
	104	} else if (ATTR_FALSE(value)) {
	105	/* false (-whitespace) */
f4b05a49	106	return ws_tab_width(whitespace_rule_cfg);
cf1b7869 JH	107	} else if (ATTR_UNSET(value)) {
	108	/* reset to default (!whitespace) */
	109	return whitespace_rule_cfg;
	110	} else {
	111	/* string */
	112	return parse_whitespace_rule(value);
	113	}
	114	} else {
	115	return whitespace_rule_cfg;
	116	}
	117	}
c1795bb0 WC	118
	119	/* The returned string should be freed by the caller. */
	120	char *whitespace_error_string(unsigned ws)
	121	{
f285a2d7	122	struct strbuf err = STRBUF_INIT;
aeb84b05	123	if ((ws & WS_TRAILING_SPACE) == WS_TRAILING_SPACE)
420f4f04	124	strbuf_addstr(&err, "trailing whitespace");
aeb84b05 JH	125	else {
	126	if (ws & WS_BLANK_AT_EOL)
	127	strbuf_addstr(&err, "trailing whitespace");
	128	if (ws & WS_BLANK_AT_EOF) {
	129	if (err.len)
	130	strbuf_addstr(&err, ", ");
	131	strbuf_addstr(&err, "new blank line at EOF");
	132	}
	133	}
c1795bb0 WC	134	if (ws & WS_SPACE_BEFORE_TAB) {
	135	if (err.len)
	136	strbuf_addstr(&err, ", ");
420f4f04	137	strbuf_addstr(&err, "space before tab in indent");
c1795bb0 WC	138	}
	139	if (ws & WS_INDENT_WITH_NON_TAB) {
	140	if (err.len)
	141	strbuf_addstr(&err, ", ");
420f4f04	142	strbuf_addstr(&err, "indent with spaces");
c1795bb0	143	}
3e3ec2ab CW	144	if (ws & WS_TAB_IN_INDENT) {
	145	if (err.len)
	146	strbuf_addstr(&err, ", ");
	147	strbuf_addstr(&err, "tab in indent");
	148	}
c1795bb0 WC	149	return strbuf_detach(&err, NULL);
	150	}
	151
	152	/* If stream is non-NULL, emits the line after checking. */
8f8841e9 JH	153	static unsigned ws_check_emit_1(const char *line, int len, unsigned ws_rule,
	154	FILE stream, const char set,
	155	const char reset, const char ws)
c1795bb0 WC	156	{
c1795bb0 WC	157	unsigned result = 0;
954ecd43	158	int written = 0;
c1795bb0 WC	159	int trailing_whitespace = -1;
c1795bb0 WC	160	int trailing_newline = 0;
b2979ff5	161	int trailing_carriage_return = 0;
c1795bb0 WC	162	int i;
	163
	164	/* Logic is simpler if we temporarily ignore the trailing newline. */
	165	if (len > 0 && line[len - 1] == '\n') {
	166	trailing_newline = 1;
	167	len--;
	168	}
b2979ff5 JH	169	if ((ws_rule & WS_CR_AT_EOL) &&
	170	len > 0 && line[len - 1] == '\r') {
	171	trailing_carriage_return = 1;
	172	len--;
	173	}
c1795bb0 WC	174
c1795bb0 WC	175	/* Check for trailing whitespace. */
aeb84b05	176	if (ws_rule & WS_BLANK_AT_EOL) {
c1795bb0 WC	177	for (i = len - 1; i >= 0; i--) {
	178	if (isspace(line[i])) {
	179	trailing_whitespace = i;
aeb84b05	180	result \|= WS_BLANK_AT_EOL;
c1795bb0 WC	181	}
	182	else
	183	break;
	184	}
	185	}
	186
cfd1a984 KB	187	if (trailing_whitespace == -1)
	188	trailing_whitespace = len;
	189
3e3ec2ab	190	/* Check indentation */
cfd1a984	191	for (i = 0; i < trailing_whitespace; i++) {
9afa2d4a	192	if (line[i] == ' ')
1020999a	193	continue;
1020999a	194	if (line[i] != '\t')
c1795bb0	195	break;
ffe56885	196	if ((ws_rule & WS_SPACE_BEFORE_TAB) && written < i) {
1020999a	197	result \|= WS_SPACE_BEFORE_TAB;
ffe56885 BF	198	if (stream) {
	199	fputs(ws, stream);
	200	fwrite(line + written, i - written, 1, stream);
	201	fputs(reset, stream);
3e3ec2ab	202	fwrite(line + i, 1, 1, stream);
ffe56885	203	}
3e3ec2ab CW	204	} else if (ws_rule & WS_TAB_IN_INDENT) {
	205	result \|= WS_TAB_IN_INDENT;
	206	if (stream) {
	207	fwrite(line + written, i - written, 1, stream);
	208	fputs(ws, stream);
	209	fwrite(line + i, 1, 1, stream);
	210	fputs(reset, stream);
	211	}
	212	} else if (stream) {
	213	fwrite(line + written, i - written + 1, 1, stream);
	214	}
9afa2d4a	215	written = i + 1;
c1795bb0 WC	216	}
	217
	218	/* Check for indent using non-tab. */
f4b05a49	219	if ((ws_rule & WS_INDENT_WITH_NON_TAB) && i - written >= ws_tab_width(ws_rule)) {
c1795bb0	220	result \|= WS_INDENT_WITH_NON_TAB;
ffe56885	221	if (stream) {
c1795bb0	222	fputs(ws, stream);
ffe56885	223	fwrite(line + written, i - written, 1, stream);
c1795bb0	224	fputs(reset, stream);
c1795bb0	225	}
ffe56885 BF	226	written = i;
ffe56885 BF	227	}
c1795bb0	228
ffe56885	229	if (stream) {
b2979ff5 JH	230	/*
	231	* Now the rest of the line starts at "written".
	232	* The non-highlighted part ends at "trailing_whitespace".
	233	*/
c1795bb0 WC	234
c1795bb0 WC	235	/* Emit non-highlighted (middle) segment. */
954ecd43	236	if (trailing_whitespace - written > 0) {
c1795bb0	237	fputs(set, stream);
954ecd43 BF	238	fwrite(line + written,
954ecd43 BF	239	trailing_whitespace - written, 1, stream);
c1795bb0 WC	240	fputs(reset, stream);
	241	}
	242
	243	/* Highlight errors in trailing whitespace. */
	244	if (trailing_whitespace != len) {
	245	fputs(ws, stream);
	246	fwrite(line + trailing_whitespace,
	247	len - trailing_whitespace, 1, stream);
	248	fputs(reset, stream);
	249	}
b2979ff5 JH	250	if (trailing_carriage_return)
b2979ff5 JH	251	fputc('\r', stream);
c1795bb0 WC	252	if (trailing_newline)
	253	fputc('\n', stream);
	254	}
	255	return result;
	256	}
fe3403c3	257
8f8841e9 JH	258	void ws_check_emit(const char *line, int len, unsigned ws_rule,
	259	FILE stream, const char set,
	260	const char reset, const char ws)
	261	{
	262	(void)ws_check_emit_1(line, len, ws_rule, stream, set, reset, ws);
	263	}
	264
	265	unsigned ws_check(const char *line, int len, unsigned ws_rule)
	266	{
	267	return ws_check_emit_1(line, len, ws_rule, NULL, NULL, NULL, NULL);
	268	}
	269
877f23cc JH	270	int ws_blank_line(const char *line, int len, unsigned ws_rule)
	271	{
	272	/*
	273	* We _might_ want to treat CR differently from other
	274	* whitespace characters when ws_rule has WS_CR_AT_EOL, but
	275	* for now we just use this stupid definition.
	276	*/
	277	while (len-- > 0) {
	278	if (!isspace(*line))
	279	return 0;
	280	line++;
	281	}
	282	return 1;
	283	}
	284
d511bd33 CW	285	/* Copy the line onto the end of the strbuf while fixing whitespaces */
d511bd33 CW	286	void ws_fix_copy(struct strbuf dst, const char src, int len, unsigned ws_rule, int *error_count)
fe3403c3 JH	287	{
	288	/*
	289	* len is number of bytes to be copied from src, starting
	290	* at src. Typically src[len-1] is '\n', unless this is
	291	* the incomplete last line.
	292	*/
	293	int i;
	294	int add_nl_to_tail = 0;
	295	int add_cr_to_tail = 0;
	296	int fixed = 0;
	297	int last_tab_in_indent = -1;
	298	int last_space_in_indent = -1;
	299	int need_fix_leading_space = 0;
fe3403c3 JH	300
	301	/*
	302	* Strip trailing whitespace
	303	*/
afd9db41	304	if (ws_rule & WS_BLANK_AT_EOL) {
422a82f2	305	if (0 < len && src[len - 1] == '\n') {
fe3403c3 JH	306	add_nl_to_tail = 1;
fe3403c3 JH	307	len--;
422a82f2	308	if (0 < len && src[len - 1] == '\r') {
fe3403c3 JH	309	add_cr_to_tail = !!(ws_rule & WS_CR_AT_EOL);
	310	len--;
	311	}
	312	}
	313	if (0 < len && isspace(src[len - 1])) {
	314	while (0 < len && isspace(src[len-1]))
	315	len--;
	316	fixed = 1;
	317	}
	318	}
	319
	320	/*
	321	* Check leading whitespaces (indent)
	322	*/
	323	for (i = 0; i < len; i++) {
	324	char ch = src[i];
	325	if (ch == '\t') {
	326	last_tab_in_indent = i;
	327	if ((ws_rule & WS_SPACE_BEFORE_TAB) &&
	328	0 <= last_space_in_indent)
	329	need_fix_leading_space = 1;
	330	} else if (ch == ' ') {
	331	last_space_in_indent = i;
	332	if ((ws_rule & WS_INDENT_WITH_NON_TAB) &&
f4b05a49	333	ws_tab_width(ws_rule) <= i - last_tab_in_indent)
fe3403c3 JH	334	need_fix_leading_space = 1;
	335	} else
	336	break;
	337	}
	338
fe3403c3 JH	339	if (need_fix_leading_space) {
	340	/* Process indent ourselves */
	341	int consecutive_spaces = 0;
	342	int last = last_tab_in_indent + 1;
	343
	344	if (ws_rule & WS_INDENT_WITH_NON_TAB) {
	345	/* have "last" point at one past the indent */
	346	if (last_tab_in_indent < last_space_in_indent)
	347	last = last_space_in_indent + 1;
	348	else
	349	last = last_tab_in_indent + 1;
	350	}
	351
	352	/*
	353	* between src[0..last-1], strip the funny spaces,
	354	* updating them to tab as needed.
	355	*/
	356	for (i = 0; i < last; i++) {
	357	char ch = src[i];
	358	if (ch != ' ') {
	359	consecutive_spaces = 0;
d511bd33	360	strbuf_addch(dst, ch);
fe3403c3 JH	361	} else {
fe3403c3 JH	362	consecutive_spaces++;
f4b05a49	363	if (consecutive_spaces == ws_tab_width(ws_rule)) {
d511bd33	364	strbuf_addch(dst, '\t');
fe3403c3 JH	365	consecutive_spaces = 0;
	366	}
	367	}
	368	}
	369	while (0 < consecutive_spaces--)
d511bd33	370	strbuf_addch(dst, ' ');
fe3403c3 JH	371	len -= last;
	372	src += last;
	373	fixed = 1;
4e35c51e CW	374	} else if ((ws_rule & WS_TAB_IN_INDENT) && last_tab_in_indent >= 0) {
4e35c51e CW	375	/* Expand tabs into spaces */
d35711ad	376	int start = dst->len;
4e35c51e CW	377	int last = last_tab_in_indent + 1;
	378	for (i = 0; i < last; i++) {
	379	if (src[i] == '\t')
	380	do {
	381	strbuf_addch(dst, ' ');
f4b05a49	382	} while ((dst->len - start) % ws_tab_width(ws_rule));
4e35c51e CW	383	else
	384	strbuf_addch(dst, src[i]);
	385	}
	386	len -= last;
	387	src += last;
	388	fixed = 1;
fe3403c3 JH	389	}
fe3403c3 JH	390
d511bd33	391	strbuf_add(dst, src, len);
fe3403c3	392	if (add_cr_to_tail)
d511bd33	393	strbuf_addch(dst, '\r');
fe3403c3	394	if (add_nl_to_tail)
d511bd33	395	strbuf_addch(dst, '\n');
fe3403c3 JH	396	if (fixed && error_count)
fe3403c3 JH	397	(*error_count)++;
fe3403c3	398	}