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tag: v1.7.5-rc0
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#include "cache.h"
#include "quote.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);
}

int sq_dequote_to_argv(char *arg, const char ***argv, int *nr, int *alloc)
{
char *next = arg;

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

return 0;
}

/* 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);
}

static const char *path_relative(const char *in, int len,
struct strbuf *sb, const char *prefix,
int prefix_len);

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 = path_relative(name, len, &sb, prefix, prefix_len);
write_name_quoted(name, fp, terminator);

strbuf_release(&sb);
}

/*
* Give path as relative to prefix.
*
* The strbuf may or may not be used, so do not assume it contains the
* returned path.
*/
static const char *path_relative(const char *in, int len,
struct strbuf *sb, const char *prefix,
int prefix_len)
{
int off, i;

if (len < 0)
len = strlen(in);
if (prefix && prefix_len < 0)
prefix_len = strlen(prefix);

off = 0;
i = 0;
while (i < prefix_len && i < len && prefix[i] == in[i]) {
if (prefix[i] == '/')
off = i + 1;
i++;
}
in += off;
len -= off;

if (i >= prefix_len)
return in;

strbuf_reset(sb);
strbuf_grow(sb, len);

while (i < prefix_len) {
if (prefix[i] == '/')
strbuf_addstr(sb, "../");
i++;
}
strbuf_add(sb, in, len);

return sb->buf;
}

/* 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 = path_relative(in, len, &sb, prefix, -1);
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);
}
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