[thirdparty/git.git] / quote.c

#include "cache.h"
#include "quote.h"
#include "argv-array.h"

int quote_path_fully = 1;

/* Help to copy the thing properly quoted for the shell safety.
 * any single quote is replaced with '\'', any exclamation point
 * is replaced with '\!', and the whole thing is enclosed in a
 *
 * E.g.
 *  original     sq_quote     result
 *  name     ==> name      ==> 'name'
 *  a b      ==> a b       ==> 'a b'
 *  a'b      ==> a'\''b    ==> 'a'\''b'
 *  a!b      ==> a'\!'b    ==> 'a'\!'b'
 */
static inline int need_bs_quote(char c)
{
	return (c == '\'' || c == '!');
}

void sq_quote_buf(struct strbuf *dst, const char *src)
{
	char *to_free = NULL;

	if (dst->buf == src)
		to_free = strbuf_detach(dst, NULL);

	strbuf_addch(dst, '\'');
	while (*src) {
		size_t len = strcspn(src, "'!");
		strbuf_add(dst, src, len);
		src += len;
		while (need_bs_quote(*src)) {
			strbuf_addstr(dst, "'\\");
			strbuf_addch(dst, *src++);
			strbuf_addch(dst, '\'');
		}
	}
	strbuf_addch(dst, '\'');
	free(to_free);
}

void sq_quote_print(FILE *stream, const char *src)
{
	char c;

	fputc('\'', stream);
	while ((c = *src++)) {
		if (need_bs_quote(c)) {
			fputs("'\\", stream);
			fputc(c, stream);
			fputc('\'', stream);
		} else {
			fputc(c, stream);
		}
	}
	fputc('\'', stream);
}

void sq_quote_argv(struct strbuf *dst, const char** argv, size_t maxlen)
{
	int i;

	/* Copy into destination buffer. */
	strbuf_grow(dst, 255);
	for (i = 0; argv[i]; ++i) {
		strbuf_addch(dst, ' ');
		sq_quote_buf(dst, argv[i]);
		if (maxlen && dst->len > maxlen)
			die("Too many or long arguments");
	}
}

static char *sq_dequote_step(char *arg, char **next)
{
	char *dst = arg;
	char *src = arg;
	char c;

	if (*src != '\'')
		return NULL;
	for (;;) {
		c = *++src;
		if (!c)
			return NULL;
		if (c != '\'') {
			*dst++ = c;
			continue;
		}
		/* We stepped out of sq */
		switch (*++src) {
		case '\0':
			*dst = 0;
			if (next)
				*next = NULL;
			return arg;
		case '\\':
			c = *++src;
			if (need_bs_quote(c) && *++src == '\'') {
				*dst++ = c;
				continue;
			}
		/* Fallthrough */
		default:
			if (!next || !isspace(*src))
				return NULL;
			do {
				c = *++src;
			} while (isspace(c));
			*dst = 0;
			*next = src;
			return arg;
		}
	}
}

char *sq_dequote(char *arg)
{
	return sq_dequote_step(arg, NULL);
}

static int sq_dequote_to_argv_internal(char *arg,
				       const char ***argv, int *nr, int *alloc,
				       struct argv_array *array)
{
	char *next = arg;

	if (!*arg)
		return 0;
	do {
		char *dequoted = sq_dequote_step(next, &next);
		if (!dequoted)
			return -1;
		if (argv) {
			ALLOC_GROW(*argv, *nr + 1, *alloc);
			(*argv)[(*nr)++] = dequoted;
		}
		if (array)
			argv_array_push(array, dequoted);
	} while (next);

	return 0;
}

int sq_dequote_to_argv(char *arg, const char ***argv, int *nr, int *alloc)
{
	return sq_dequote_to_argv_internal(arg, argv, nr, alloc, NULL);
}

int sq_dequote_to_argv_array(char *arg, struct argv_array *array)
{
	return sq_dequote_to_argv_internal(arg, NULL, NULL, NULL, array);
}

/* 1 means: quote as octal
 * 0 means: quote as octal if (quote_path_fully)
 * -1 means: never quote
 * c: quote as "\\c"
 */
#define X8(x)   x, x, x, x, x, x, x, x
#define X16(x)  X8(x), X8(x)
static signed char const sq_lookup[256] = {
	/*           0    1    2    3    4    5    6    7 */
	/* 0x00 */   1,   1,   1,   1,   1,   1,   1, 'a',
	/* 0x08 */ 'b', 't', 'n', 'v', 'f', 'r',   1,   1,
	/* 0x10 */ X16(1),
	/* 0x20 */  -1,  -1, '"',  -1,  -1,  -1,  -1,  -1,
	/* 0x28 */ X16(-1), X16(-1), X16(-1),
	/* 0x58 */  -1,  -1,  -1,  -1,'\\',  -1,  -1,  -1,
	/* 0x60 */ X16(-1), X8(-1),
	/* 0x78 */  -1,  -1,  -1,  -1,  -1,  -1,  -1,   1,
	/* 0x80 */ /* set to 0 */
};

static inline int sq_must_quote(char c)
{
	return sq_lookup[(unsigned char)c] + quote_path_fully > 0;
}

/* returns the longest prefix not needing a quote up to maxlen if positive.
   This stops at the first \0 because it's marked as a character needing an
   escape */
static size_t next_quote_pos(const char *s, ssize_t maxlen)
{
	size_t len;
	if (maxlen < 0) {
		for (len = 0; !sq_must_quote(s[len]); len++);
	} else {
		for (len = 0; len < maxlen && !sq_must_quote(s[len]); len++);
	}
	return len;
}

/*
 * C-style name quoting.
 *
 * (1) if sb and fp are both NULL, inspect the input name and counts the
 *     number of bytes that are needed to hold c_style quoted version of name,
 *     counting the double quotes around it but not terminating NUL, and
 *     returns it.
 *     However, if name does not need c_style quoting, it returns 0.
 *
 * (2) if sb or fp are not NULL, it emits the c_style quoted version
 *     of name, enclosed with double quotes if asked and needed only.
 *     Return value is the same as in (1).
 */
static size_t quote_c_style_counted(const char *name, ssize_t maxlen,
                                    struct strbuf *sb, FILE *fp, int no_dq)
{
#undef EMIT
#define EMIT(c)                                 \
	do {                                        \
		if (sb) strbuf_addch(sb, (c));          \
		if (fp) fputc((c), fp);                 \
		count++;                                \
	} while (0)
#define EMITBUF(s, l)                           \
	do {                                        \
		if (sb) strbuf_add(sb, (s), (l));       \
		if (fp) fwrite((s), (l), 1, fp);        \
		count += (l);                           \
	} while (0)

	size_t len, count = 0;
	const char *p = name;

	for (;;) {
		int ch;

		len = next_quote_pos(p, maxlen);
		if (len == maxlen || (maxlen < 0 && !p[len]))
			break;

		if (!no_dq && p == name)
			EMIT('"');

		EMITBUF(p, len);
		EMIT('\\');
		p += len;
		ch = (unsigned char)*p++;
		if (maxlen >= 0)
			maxlen -= len + 1;
		if (sq_lookup[ch] >= ' ') {
			EMIT(sq_lookup[ch]);
		} else {
			EMIT(((ch >> 6) & 03) + '0');
			EMIT(((ch >> 3) & 07) + '0');
			EMIT(((ch >> 0) & 07) + '0');
		}
	}

	EMITBUF(p, len);
	if (p == name)   /* no ending quote needed */
		return 0;

	if (!no_dq)
		EMIT('"');
	return count;
}

size_t quote_c_style(const char *name, struct strbuf *sb, FILE *fp, int nodq)
{
	return quote_c_style_counted(name, -1, sb, fp, nodq);
}

void quote_two_c_style(struct strbuf *sb, const char *prefix, const char *path, int nodq)
{
	if (quote_c_style(prefix, NULL, NULL, 0) ||
	    quote_c_style(path, NULL, NULL, 0)) {
		if (!nodq)
			strbuf_addch(sb, '"');
		quote_c_style(prefix, sb, NULL, 1);
		quote_c_style(path, sb, NULL, 1);
		if (!nodq)
			strbuf_addch(sb, '"');
	} else {
		strbuf_addstr(sb, prefix);
		strbuf_addstr(sb, path);
	}
}

void write_name_quoted(const char *name, FILE *fp, int terminator)
{
	if (terminator) {
		quote_c_style(name, NULL, fp, 0);
	} else {
		fputs(name, fp);
	}
	fputc(terminator, fp);
}

void write_name_quotedpfx(const char *pfx, size_t pfxlen,
			  const char *name, FILE *fp, int terminator)
{
	int needquote = 0;

	if (terminator) {
		needquote = next_quote_pos(pfx, pfxlen) < pfxlen
			|| name[next_quote_pos(name, -1)];
	}
	if (needquote) {
		fputc('"', fp);
		quote_c_style_counted(pfx, pfxlen, NULL, fp, 1);
		quote_c_style(name, NULL, fp, 1);
		fputc('"', fp);
	} else {
		fwrite(pfx, pfxlen, 1, fp);
		fputs(name, fp);
	}
	fputc(terminator, fp);
}

void write_name_quoted_relative(const char *name, size_t len,
				const char *prefix, size_t prefix_len,
				FILE *fp, int terminator)
{
	struct strbuf sb = STRBUF_INIT;

	name = relative_path(name, prefix, &sb);
	write_name_quoted(name, fp, terminator);

	strbuf_release(&sb);
}

/* quote path as relative to the given prefix */
char *quote_path_relative(const char *in, int len,
			  struct strbuf *out, const char *prefix)
{
	struct strbuf sb = STRBUF_INIT;
	const char *rel = relative_path(in, prefix, &sb);
	strbuf_reset(out);
	quote_c_style_counted(rel, strlen(rel), out, NULL, 0);
	strbuf_release(&sb);

	if (!out->len)
		strbuf_addstr(out, "./");

	return out->buf;
}

/*
 * C-style name unquoting.
 *
 * Quoted should point at the opening double quote.
 * + Returns 0 if it was able to unquote the string properly, and appends the
 *   result in the strbuf `sb'.
 * + Returns -1 in case of error, and doesn't touch the strbuf. Though note
 *   that this function will allocate memory in the strbuf, so calling
 *   strbuf_release is mandatory whichever result unquote_c_style returns.
 *
 * Updates endp pointer to point at one past the ending double quote if given.
 */
int unquote_c_style(struct strbuf *sb, const char *quoted, const char **endp)
{
	size_t oldlen = sb->len, len;
	int ch, ac;

	if (*quoted++ != '"')
		return -1;

	for (;;) {
		len = strcspn(quoted, "\"\\");
		strbuf_add(sb, quoted, len);
		quoted += len;

		switch (*quoted++) {
		  case '"':
			if (endp)
				*endp = quoted;
			return 0;
		  case '\\':
			break;
		  default:
			goto error;
		}

		switch ((ch = *quoted++)) {
		case 'a': ch = '\a'; break;
		case 'b': ch = '\b'; break;
		case 'f': ch = '\f'; break;
		case 'n': ch = '\n'; break;
		case 'r': ch = '\r'; break;
		case 't': ch = '\t'; break;
		case 'v': ch = '\v'; break;

		case '\\': case '"':
			break; /* verbatim */

		/* octal values with first digit over 4 overflow */
		case '0': case '1': case '2': case '3':
					ac = ((ch - '0') << 6);
			if ((ch = *quoted++) < '0' || '7' < ch)
				goto error;
					ac |= ((ch - '0') << 3);
			if ((ch = *quoted++) < '0' || '7' < ch)
				goto error;
					ac |= (ch - '0');
					ch = ac;
					break;
				default:
			goto error;
			}
		strbuf_addch(sb, ch);
		}

  error:
	strbuf_setlen(sb, oldlen);
	return -1;
}

/* quoting as a string literal for other languages */

void perl_quote_print(FILE *stream, const char *src)
{
	const char sq = '\'';
	const char bq = '\\';
	char c;

	fputc(sq, stream);
	while ((c = *src++)) {
		if (c == sq || c == bq)
			fputc(bq, stream);
		fputc(c, stream);
	}
	fputc(sq, stream);
}

void python_quote_print(FILE *stream, const char *src)
{
	const char sq = '\'';
	const char bq = '\\';
	const char nl = '\n';
	char c;

	fputc(sq, stream);
	while ((c = *src++)) {
		if (c == nl) {
			fputc(bq, stream);
			fputc('n', stream);
			continue;
		}
		if (c == sq || c == bq)
			fputc(bq, stream);
		fputc(c, stream);
	}
	fputc(sq, stream);
}

void tcl_quote_print(FILE *stream, const char *src)
{
	char c;

	fputc('"', stream);
	while ((c = *src++)) {
		switch (c) {
		case '[': case ']':
		case '{': case '}':
		case '$': case '\\': case '"':
			fputc('\\', stream);
		default:
			fputc(c, stream);
			break;
		case '\f':
			fputs("\\f", stream);
			break;
		case '\r':
			fputs("\\r", stream);
			break;
		case '\n':
			fputs("\\n", stream);
			break;
		case '\t':
			fputs("\\t", stream);
			break;
		case '\v':
			fputs("\\v", stream);
			break;
		}
	}
	fputc('"', stream);
}
Commit	Line	Data
6fb737be JH	1	#include "cache.h"
6fb737be JH	2	#include "quote.h"
37e8161a	3	#include "argv-array.h"
6fb737be	4
5b8e6f85 DP	5	int quote_path_fully = 1;
5b8e6f85 DP	6
6fb737be	7	/* Help to copy the thing properly quoted for the shell safety.
77d604c3 PA	8	* any single quote is replaced with '\'', any exclamation point
77d604c3 PA	9	* is replaced with '\!', and the whole thing is enclosed in a
6fb737be JH	10	*
	11	* E.g.
	12	* original sq_quote result
	13	* name ==> name ==> 'name'
	14	* a b ==> a b ==> 'a b'
	15	* a'b ==> a'\''b ==> 'a'\''b'
77d604c3	16	* a!b ==> a'\!'b ==> 'a'\!'b'
6fb737be	17	*/
35eb2d36 LT	18	static inline int need_bs_quote(char c)
	19	{
	20	return (c == '\'' \|\| c == '!');
	21	}
	22
7a33bcbe	23	void sq_quote_buf(struct strbuf dst, const char src)
77d604c3	24	{
7a33bcbe PH	25	char *to_free = NULL;
	26
	27	if (dst->buf == src)
b315c5c0	28	to_free = strbuf_detach(dst, NULL);
7a33bcbe PH	29
	30	strbuf_addch(dst, '\'');
	31	while (*src) {
c2015b3a	32	size_t len = strcspn(src, "'!");
7a33bcbe PH	33	strbuf_add(dst, src, len);
	34	src += len;
	35	while (need_bs_quote(*src)) {
	36	strbuf_addstr(dst, "'\\");
	37	strbuf_addch(dst, *src++);
	38	strbuf_addch(dst, '\'');
6fb737be JH	39	}
6fb737be JH	40	}
7a33bcbe PH	41	strbuf_addch(dst, '\'');
7a33bcbe PH	42	free(to_free);
77d604c3 PA	43	}
77d604c3 PA	44
575ba9d6 ML	45	void sq_quote_print(FILE stream, const char src)
	46	{
	47	char c;
	48
	49	fputc('\'', stream);
	50	while ((c = *src++)) {
	51	if (need_bs_quote(c)) {
	52	fputs("'\\", stream);
	53	fputc(c, stream);
	54	fputc('\'', stream);
	55	} else {
	56	fputc(c, stream);
	57	}
	58	}
	59	fputc('\'', stream);
	60	}
	61
b319ce4c	62	void sq_quote_argv(struct strbuf dst, const char* argv, size_t maxlen)
7cf67205	63	{
7cf67205	64	int i;
7cf67205	65
7cf67205	66	/* Copy into destination buffer. */
b319ce4c CC	67	strbuf_grow(dst, 255);
b319ce4c CC	68	for (i = 0; argv[i]; ++i) {
7a33bcbe PH	69	strbuf_addch(dst, ' ');
	70	sq_quote_buf(dst, argv[i]);
	71	if (maxlen && dst->len > maxlen)
	72	die("Too many or long arguments");
7cf67205	73	}
86257aa3 CC	74	}
86257aa3 CC	75
758e915b	76	static char sq_dequote_step(char arg, char **next)
35eb2d36 LT	77	{
	78	char *dst = arg;
	79	char *src = arg;
	80	char c;
	81
	82	if (*src != '\'')
	83	return NULL;
	84	for (;;) {
	85	c = *++src;
	86	if (!c)
	87	return NULL;
	88	if (c != '\'') {
	89	*dst++ = c;
	90	continue;
	91	}
	92	/* We stepped out of sq */
	93	switch (*++src) {
	94	case '\0':
	95	*dst = 0;
ebbc088e CC	96	if (next)
ebbc088e CC	97	*next = NULL;
35eb2d36 LT	98	return arg;
	99	case '\\':
	100	c = *++src;
	101	if (need_bs_quote(c) && *++src == '\'') {
	102	*dst++ = c;
	103	continue;
	104	}
	105	/* Fallthrough */
	106	default:
ebbc088e CC	107	if (!next \|\| !isspace(*src))
	108	return NULL;
	109	do {
	110	c = *++src;
	111	} while (isspace(c));
	112	*dst = 0;
	113	*next = src;
	114	return arg;
35eb2d36 LT	115	}
	116	}
	117	}
	118
ebbc088e CC	119	char sq_dequote(char arg)
	120	{
	121	return sq_dequote_step(arg, NULL);
	122	}
	123
37e8161a JK	124	static int sq_dequote_to_argv_internal(char *arg,
	125	const char **argv, int nr, int *alloc,
	126	struct argv_array *array)
eaa759b9 CC	127	{
	128	char *next = arg;
	129
	130	if (!*arg)
	131	return 0;
	132	do {
	133	char *dequoted = sq_dequote_step(next, &next);
	134	if (!dequoted)
	135	return -1;
37e8161a JK	136	if (argv) {
	137	ALLOC_GROW(argv, nr + 1, *alloc);
	138	(argv)[(nr)++] = dequoted;
	139	}
	140	if (array)
	141	argv_array_push(array, dequoted);
eaa759b9 CC	142	} while (next);
	143
	144	return 0;
	145	}
	146
37e8161a JK	147	int sq_dequote_to_argv(char arg, const char *argv, int nr, int *alloc)
	148	{
	149	return sq_dequote_to_argv_internal(arg, argv, nr, alloc, NULL);
	150	}
	151
	152	int sq_dequote_to_argv_array(char arg, struct argv_array array)
	153	{
	154	return sq_dequote_to_argv_internal(arg, NULL, NULL, NULL, array);
	155	}
	156
663af342 PH	157	/* 1 means: quote as octal
	158	* 0 means: quote as octal if (quote_path_fully)
	159	* -1 means: never quote
	160	* c: quote as "\\c"
	161	*/
	162	#define X8(x) x, x, x, x, x, x, x, x
	163	#define X16(x) X8(x), X8(x)
	164	static signed char const sq_lookup[256] = {
	165	/* 0 1 2 3 4 5 6 7 */
	166	/* 0x00 */ 1, 1, 1, 1, 1, 1, 1, 'a',
	167	/* 0x08 */ 'b', 't', 'n', 'v', 'f', 'r', 1, 1,
	168	/* 0x10 */ X16(1),
	169	/* 0x20 */ -1, -1, '"', -1, -1, -1, -1, -1,
	170	/* 0x28 */ X16(-1), X16(-1), X16(-1),
	171	/* 0x58 */ -1, -1, -1, -1,'\\', -1, -1, -1,
	172	/* 0x60 */ X16(-1), X8(-1),
	173	/* 0x78 */ -1, -1, -1, -1, -1, -1, -1, 1,
	174	/* 0x80 / / set to 0 */
	175	};
	176
f3fa1838 JH	177	static inline int sq_must_quote(char c)
f3fa1838 JH	178	{
663af342 PH	179	return sq_lookup[(unsigned char)c] + quote_path_fully > 0;
	180	}
	181
	182	/* returns the longest prefix not needing a quote up to maxlen if positive.
	183	This stops at the first \0 because it's marked as a character needing an
	184	escape */
	185	static size_t next_quote_pos(const char *s, ssize_t maxlen)
	186	{
	187	size_t len;
	188	if (maxlen < 0) {
	189	for (len = 0; !sq_must_quote(s[len]); len++);
	190	} else {
	191	for (len = 0; len < maxlen && !sq_must_quote(s[len]); len++);
	192	}
	193	return len;
	194	}
	195
4f6fbcdc JH	196	/*
	197	* C-style name quoting.
	198	*
663af342 PH	199	* (1) if sb and fp are both NULL, inspect the input name and counts the
	200	* number of bytes that are needed to hold c_style quoted version of name,
	201	* counting the double quotes around it but not terminating NUL, and
	202	* returns it.
	203	* However, if name does not need c_style quoting, it returns 0.
4f6fbcdc	204	*
663af342 PH	205	* (2) if sb or fp are not NULL, it emits the c_style quoted version
	206	* of name, enclosed with double quotes if asked and needed only.
	207	* Return value is the same as in (1).
4f6fbcdc	208	*/
663af342 PH	209	static size_t quote_c_style_counted(const char *name, ssize_t maxlen,
663af342 PH	210	struct strbuf sb, FILE fp, int no_dq)
4f6fbcdc JH	211	{
4f6fbcdc JH	212	#undef EMIT
663af342 PH	213	#define EMIT(c) \
	214	do { \
	215	if (sb) strbuf_addch(sb, (c)); \
	216	if (fp) fputc((c), fp); \
	217	count++; \
	218	} while (0)
	219	#define EMITBUF(s, l) \
	220	do { \
	221	if (sb) strbuf_add(sb, (s), (l)); \
	222	if (fp) fwrite((s), (l), 1, fp); \
	223	count += (l); \
	224	} while (0)
	225
	226	size_t len, count = 0;
	227	const char *p = name;
4f6fbcdc	228
663af342 PH	229	for (;;) {
663af342 PH	230	int ch;
4f6fbcdc	231
663af342	232	len = next_quote_pos(p, maxlen);
84249819	233	if (len == maxlen \|\| (maxlen < 0 && !p[len]))
50e7b067	234	break;
663af342 PH	235
	236	if (!no_dq && p == name)
	237	EMIT('"');
	238
	239	EMITBUF(p, len);
	240	EMIT('\\');
	241	p += len;
	242	ch = (unsigned char)*p++;
84249819 JK	243	if (maxlen >= 0)
84249819 JK	244	maxlen -= len + 1;
663af342 PH	245	if (sq_lookup[ch] >= ' ') {
	246	EMIT(sq_lookup[ch]);
	247	} else {
	248	EMIT(((ch >> 6) & 03) + '0');
	249	EMIT(((ch >> 3) & 07) + '0');
	250	EMIT(((ch >> 0) & 07) + '0');
4f6fbcdc	251	}
4f6fbcdc	252	}
663af342 PH	253
	254	EMITBUF(p, len);
	255	if (p == name) /* no ending quote needed */
	256	return 0;
	257
4f6fbcdc JH	258	if (!no_dq)
4f6fbcdc JH	259	EMIT('"');
663af342 PH	260	return count;
663af342 PH	261	}
4f6fbcdc	262
663af342 PH	263	size_t quote_c_style(const char name, struct strbuf sb, FILE *fp, int nodq)
	264	{
	265	return quote_c_style_counted(name, -1, sb, fp, nodq);
4f6fbcdc JH	266	}
4f6fbcdc JH	267
d5625091 JH	268	void quote_two_c_style(struct strbuf sb, const char prefix, const char *path, int nodq)
	269	{
	270	if (quote_c_style(prefix, NULL, NULL, 0) \|\|
	271	quote_c_style(path, NULL, NULL, 0)) {
	272	if (!nodq)
	273	strbuf_addch(sb, '"');
	274	quote_c_style(prefix, sb, NULL, 1);
	275	quote_c_style(path, sb, NULL, 1);
	276	if (!nodq)
	277	strbuf_addch(sb, '"');
	278	} else {
	279	strbuf_addstr(sb, prefix);
	280	strbuf_addstr(sb, path);
	281	}
	282	}
	283
663af342	284	void write_name_quoted(const char name, FILE fp, int terminator)
9ef2b3cb	285	{
663af342 PH	286	if (terminator) {
	287	quote_c_style(name, NULL, fp, 0);
	288	} else {
	289	fputs(name, fp);
	290	}
	291	fputc(terminator, fp);
	292	}
	293
2af202be LT	294	void write_name_quotedpfx(const char *pfx, size_t pfxlen,
2af202be LT	295	const char name, FILE fp, int terminator)
663af342 PH	296	{
	297	int needquote = 0;
	298
	299	if (terminator) {
	300	needquote = next_quote_pos(pfx, pfxlen) < pfxlen
	301	\|\| name[next_quote_pos(name, -1)];
	302	}
	303	if (needquote) {
	304	fputc('"', fp);
	305	quote_c_style_counted(pfx, pfxlen, NULL, fp, 1);
	306	quote_c_style(name, NULL, fp, 1);
	307	fputc('"', fp);
	308	} else {
	309	fwrite(pfx, pfxlen, 1, fp);
	310	fputs(name, fp);
	311	}
	312	fputc(terminator, fp);
9ef2b3cb JH	313	}
9ef2b3cb JH	314
b167cffb CB	315	void write_name_quoted_relative(const char *name, size_t len,
	316	const char *prefix, size_t prefix_len,
	317	FILE *fp, int terminator)
a734d0b1	318	{
b167cffb CB	319	struct strbuf sb = STRBUF_INIT;
b167cffb CB	320
ad66df2d	321	name = relative_path(name, prefix, &sb);
b167cffb CB	322	write_name_quoted(name, fp, terminator);
	323
	324	strbuf_release(&sb);
	325	}
	326
b167cffb CB	327	/* quote path as relative to the given prefix */
	328	char quote_path_relative(const char in, int len,
	329	struct strbuf out, const char prefix)
	330	{
	331	struct strbuf sb = STRBUF_INIT;
ad66df2d	332	const char *rel = relative_path(in, prefix, &sb);
b167cffb CB	333	strbuf_reset(out);
	334	quote_c_style_counted(rel, strlen(rel), out, NULL, 0);
	335	strbuf_release(&sb);
a734d0b1	336
a734d0b1 DP	337	if (!out->len)
	338	strbuf_addstr(out, "./");
	339
	340	return out->buf;
	341	}
	342
4f6fbcdc JH	343	/*
	344	* C-style name unquoting.
	345	*
7fb1011e PH	346	* Quoted should point at the opening double quote.
	347	* + Returns 0 if it was able to unquote the string properly, and appends the
	348	* result in the strbuf `sb'.
	349	* + Returns -1 in case of error, and doesn't touch the strbuf. Though note
	350	* that this function will allocate memory in the strbuf, so calling
	351	* strbuf_release is mandatory whichever result unquote_c_style returns.
	352	*
	353	* Updates endp pointer to point at one past the ending double quote if given.
4f6fbcdc	354	*/
7fb1011e	355	int unquote_c_style(struct strbuf sb, const char quoted, const char **endp)
4f6fbcdc	356	{
7fb1011e PH	357	size_t oldlen = sb->len, len;
7fb1011e PH	358	int ch, ac;
4f6fbcdc JH	359
4f6fbcdc JH	360	if (*quoted++ != '"')
7fb1011e PH	361	return -1;
	362
	363	for (;;) {
	364	len = strcspn(quoted, "\"\\");
	365	strbuf_add(sb, quoted, len);
	366	quoted += len;
4f6fbcdc	367
7fb1011e PH	368	switch (*quoted++) {
	369	case '"':
	370	if (endp)
c8744d6a	371	*endp = quoted;
7fb1011e PH	372	return 0;
	373	case '\\':
	374	break;
	375	default:
	376	goto error;
	377	}
	378
	379	switch ((ch = *quoted++)) {
	380	case 'a': ch = '\a'; break;
	381	case 'b': ch = '\b'; break;
	382	case 'f': ch = '\f'; break;
	383	case 'n': ch = '\n'; break;
	384	case 'r': ch = '\r'; break;
	385	case 't': ch = '\t'; break;
	386	case 'v': ch = '\v'; break;
	387
	388	case '\\': case '"':
	389	break; /* verbatim */
	390
	391	/* octal values with first digit over 4 overflow */
	392	case '0': case '1': case '2': case '3':
4f6fbcdc	393	ac = ((ch - '0') << 6);
7fb1011e PH	394	if ((ch = *quoted++) < '0' \|\| '7' < ch)
7fb1011e PH	395	goto error;
4f6fbcdc	396	ac \|= ((ch - '0') << 3);
7fb1011e PH	397	if ((ch = *quoted++) < '0' \|\| '7' < ch)
7fb1011e PH	398	goto error;
4f6fbcdc JH	399	ac \|= (ch - '0');
	400	ch = ac;
	401	break;
	402	default:
7fb1011e	403	goto error;
4f6fbcdc	404	}
7fb1011e	405	strbuf_addch(sb, ch);
4f6fbcdc JH	406	}
4f6fbcdc JH	407
7fb1011e PH	408	error:
	409	strbuf_setlen(sb, oldlen);
	410	return -1;
4f6fbcdc JH	411	}
4f6fbcdc JH	412
9f613ddd JH	413	/* quoting as a string literal for other languages */
	414
	415	void perl_quote_print(FILE stream, const char src)
	416	{
	417	const char sq = '\'';
	418	const char bq = '\\';
	419	char c;
	420
	421	fputc(sq, stream);
	422	while ((c = *src++)) {
	423	if (c == sq \|\| c == bq)
	424	fputc(bq, stream);
	425	fputc(c, stream);
	426	}
	427	fputc(sq, stream);
	428	}
	429
	430	void python_quote_print(FILE stream, const char src)
	431	{
	432	const char sq = '\'';
	433	const char bq = '\\';
	434	const char nl = '\n';
	435	char c;
	436
	437	fputc(sq, stream);
	438	while ((c = *src++)) {
	439	if (c == nl) {
	440	fputc(bq, stream);
	441	fputc('n', stream);
	442	continue;
	443	}
	444	if (c == sq \|\| c == bq)
	445	fputc(bq, stream);
	446	fputc(c, stream);
	447	}
	448	fputc(sq, stream);
	449	}
5558e55c SP	450
	451	void tcl_quote_print(FILE stream, const char src)
	452	{
	453	char c;
	454
	455	fputc('"', stream);
	456	while ((c = *src++)) {
	457	switch (c) {
	458	case '[': case ']':
	459	case '{': case '}':
	460	case '$': case '\\': case '"':
	461	fputc('\\', stream);
	462	default:
	463	fputc(c, stream);
	464	break;
	465	case '\f':
	466	fputs("\\f", stream);
	467	break;
	468	case '\r':
	469	fputs("\\r", stream);
	470	break;
	471	case '\n':
	472	fputs("\\n", stream);
	473	break;
	474	case '\t':
	475	fputs("\\t", stream);
	476	break;
	477	case '\v':
	478	fputs("\\v", stream);
	479	break;
	480	}
	481	}
	482	fputc('"', stream);
	483	}