[thirdparty/git.git] / quote.c

#include "cache.h"
#include "quote.h"

/* 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");
	}
}

char *sq_dequote(char *arg)
{
	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;
			return arg;
		case '\\':
			c = *++src;
			if (need_bs_quote(c) && *++src == '\'') {
				*dst++ = c;
				continue;
			}
		/* Fallthrough */
		default:
			return NULL;
		}
	}
}

/* 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 || !p[len])
			break;

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

		EMITBUF(p, len);
		EMIT('\\');
		p += len;
		ch = (unsigned char)*p++;
		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);
}

extern 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);
}

/* quote path as relative to the given prefix */
char *quote_path_relative(const char *in, int len,
			  struct strbuf *out, const char *prefix)
{
	int needquote;

	if (len < 0)
		len = strlen(in);

	/* "../" prefix itself does not need quoting, but "in" might. */
	needquote = next_quote_pos(in, len) < len;
	strbuf_setlen(out, 0);
	strbuf_grow(out, len);

	if (needquote)
		strbuf_addch(out, '"');
	if (prefix) {
		int off = 0;
		while (prefix[off] && off < len && prefix[off] == in[off])
			if (prefix[off] == '/') {
				prefix += off + 1;
				in += off + 1;
				len -= off + 1;
				off = 0;
			} else
				off++;

		for (; *prefix; prefix++)
			if (*prefix == '/')
				strbuf_addstr(out, "../");
	}

	quote_c_style_counted (in, len, out, NULL, 1);

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