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https://github.com/git/git.git
synced 2024-11-26 03:14:50 +08:00
479 lines
10 KiB
C
479 lines
10 KiB
C
#include "cache.h"
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#include "quote.h"
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int quote_path_fully = 1;
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/* Help to copy the thing properly quoted for the shell safety.
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* any single quote is replaced with '\'', any exclamation point
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* is replaced with '\!', and the whole thing is enclosed in a
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*
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* E.g.
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* original sq_quote result
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* name ==> name ==> 'name'
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* a b ==> a b ==> 'a b'
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* a'b ==> a'\''b ==> 'a'\''b'
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* a!b ==> a'\!'b ==> 'a'\!'b'
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*/
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static inline int need_bs_quote(char c)
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{
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return (c == '\'' || c == '!');
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}
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void sq_quote_buf(struct strbuf *dst, const char *src)
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{
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char *to_free = NULL;
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if (dst->buf == src)
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to_free = strbuf_detach(dst, NULL);
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strbuf_addch(dst, '\'');
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while (*src) {
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size_t len = strcspn(src, "'!");
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strbuf_add(dst, src, len);
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src += len;
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while (need_bs_quote(*src)) {
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strbuf_addstr(dst, "'\\");
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strbuf_addch(dst, *src++);
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strbuf_addch(dst, '\'');
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}
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}
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strbuf_addch(dst, '\'');
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free(to_free);
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}
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void sq_quote_print(FILE *stream, const char *src)
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{
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char c;
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fputc('\'', stream);
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while ((c = *src++)) {
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if (need_bs_quote(c)) {
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fputs("'\\", stream);
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fputc(c, stream);
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fputc('\'', stream);
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} else {
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fputc(c, stream);
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}
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}
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fputc('\'', stream);
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}
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void sq_quote_argv(struct strbuf *dst, const char** argv, size_t maxlen)
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{
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int i;
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/* Copy into destination buffer. */
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strbuf_grow(dst, 255);
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for (i = 0; argv[i]; ++i) {
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strbuf_addch(dst, ' ');
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sq_quote_buf(dst, argv[i]);
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if (maxlen && dst->len > maxlen)
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die("Too many or long arguments");
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}
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}
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static char *sq_dequote_step(char *arg, char **next)
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{
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char *dst = arg;
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char *src = arg;
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char c;
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if (*src != '\'')
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return NULL;
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for (;;) {
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c = *++src;
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if (!c)
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return NULL;
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if (c != '\'') {
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*dst++ = c;
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continue;
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}
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/* We stepped out of sq */
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switch (*++src) {
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case '\0':
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*dst = 0;
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if (next)
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*next = NULL;
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return arg;
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case '\\':
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c = *++src;
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if (need_bs_quote(c) && *++src == '\'') {
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*dst++ = c;
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continue;
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}
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/* Fallthrough */
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default:
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if (!next || !isspace(*src))
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return NULL;
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do {
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c = *++src;
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} while (isspace(c));
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*dst = 0;
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*next = src;
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return arg;
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}
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}
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}
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char *sq_dequote(char *arg)
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{
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return sq_dequote_step(arg, NULL);
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}
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int sq_dequote_to_argv(char *arg, const char ***argv, int *nr, int *alloc)
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{
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char *next = arg;
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if (!*arg)
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return 0;
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do {
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char *dequoted = sq_dequote_step(next, &next);
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if (!dequoted)
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return -1;
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ALLOC_GROW(*argv, *nr + 1, *alloc);
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(*argv)[(*nr)++] = dequoted;
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} while (next);
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return 0;
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}
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/* 1 means: quote as octal
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* 0 means: quote as octal if (quote_path_fully)
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* -1 means: never quote
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* c: quote as "\\c"
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*/
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#define X8(x) x, x, x, x, x, x, x, x
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#define X16(x) X8(x), X8(x)
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static signed char const sq_lookup[256] = {
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/* 0 1 2 3 4 5 6 7 */
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/* 0x00 */ 1, 1, 1, 1, 1, 1, 1, 'a',
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/* 0x08 */ 'b', 't', 'n', 'v', 'f', 'r', 1, 1,
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/* 0x10 */ X16(1),
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/* 0x20 */ -1, -1, '"', -1, -1, -1, -1, -1,
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/* 0x28 */ X16(-1), X16(-1), X16(-1),
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/* 0x58 */ -1, -1, -1, -1,'\\', -1, -1, -1,
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/* 0x60 */ X16(-1), X8(-1),
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/* 0x78 */ -1, -1, -1, -1, -1, -1, -1, 1,
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/* 0x80 */ /* set to 0 */
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};
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static inline int sq_must_quote(char c)
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{
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return sq_lookup[(unsigned char)c] + quote_path_fully > 0;
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}
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/* returns the longest prefix not needing a quote up to maxlen if positive.
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This stops at the first \0 because it's marked as a character needing an
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escape */
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static size_t next_quote_pos(const char *s, ssize_t maxlen)
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{
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size_t len;
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if (maxlen < 0) {
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for (len = 0; !sq_must_quote(s[len]); len++);
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} else {
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for (len = 0; len < maxlen && !sq_must_quote(s[len]); len++);
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}
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return len;
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}
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/*
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* C-style name quoting.
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*
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* (1) if sb and fp are both NULL, inspect the input name and counts the
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* number of bytes that are needed to hold c_style quoted version of name,
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* counting the double quotes around it but not terminating NUL, and
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* returns it.
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* However, if name does not need c_style quoting, it returns 0.
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*
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* (2) if sb or fp are not NULL, it emits the c_style quoted version
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* of name, enclosed with double quotes if asked and needed only.
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* Return value is the same as in (1).
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*/
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static size_t quote_c_style_counted(const char *name, ssize_t maxlen,
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struct strbuf *sb, FILE *fp, int no_dq)
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{
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#undef EMIT
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#define EMIT(c) \
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do { \
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if (sb) strbuf_addch(sb, (c)); \
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if (fp) fputc((c), fp); \
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count++; \
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} while (0)
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#define EMITBUF(s, l) \
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do { \
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if (sb) strbuf_add(sb, (s), (l)); \
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if (fp) fwrite((s), (l), 1, fp); \
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count += (l); \
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} while (0)
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size_t len, count = 0;
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const char *p = name;
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for (;;) {
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int ch;
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len = next_quote_pos(p, maxlen);
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if (len == maxlen || !p[len])
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break;
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if (!no_dq && p == name)
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EMIT('"');
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EMITBUF(p, len);
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EMIT('\\');
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p += len;
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ch = (unsigned char)*p++;
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if (sq_lookup[ch] >= ' ') {
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EMIT(sq_lookup[ch]);
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} else {
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EMIT(((ch >> 6) & 03) + '0');
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EMIT(((ch >> 3) & 07) + '0');
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EMIT(((ch >> 0) & 07) + '0');
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}
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}
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EMITBUF(p, len);
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if (p == name) /* no ending quote needed */
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return 0;
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if (!no_dq)
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EMIT('"');
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return count;
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}
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size_t quote_c_style(const char *name, struct strbuf *sb, FILE *fp, int nodq)
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{
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return quote_c_style_counted(name, -1, sb, fp, nodq);
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}
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void quote_two_c_style(struct strbuf *sb, const char *prefix, const char *path, int nodq)
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{
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if (quote_c_style(prefix, NULL, NULL, 0) ||
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quote_c_style(path, NULL, NULL, 0)) {
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if (!nodq)
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strbuf_addch(sb, '"');
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quote_c_style(prefix, sb, NULL, 1);
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quote_c_style(path, sb, NULL, 1);
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if (!nodq)
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strbuf_addch(sb, '"');
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} else {
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strbuf_addstr(sb, prefix);
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strbuf_addstr(sb, path);
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}
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}
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void write_name_quoted(const char *name, FILE *fp, int terminator)
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{
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if (terminator) {
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quote_c_style(name, NULL, fp, 0);
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} else {
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fputs(name, fp);
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}
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fputc(terminator, fp);
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}
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void write_name_quotedpfx(const char *pfx, size_t pfxlen,
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const char *name, FILE *fp, int terminator)
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{
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int needquote = 0;
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if (terminator) {
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needquote = next_quote_pos(pfx, pfxlen) < pfxlen
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|| name[next_quote_pos(name, -1)];
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}
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if (needquote) {
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fputc('"', fp);
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quote_c_style_counted(pfx, pfxlen, NULL, fp, 1);
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quote_c_style(name, NULL, fp, 1);
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fputc('"', fp);
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} else {
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fwrite(pfx, pfxlen, 1, fp);
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fputs(name, fp);
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}
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fputc(terminator, fp);
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}
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/* quote path as relative to the given prefix */
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char *quote_path_relative(const char *in, int len,
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struct strbuf *out, const char *prefix)
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{
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int needquote;
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if (len < 0)
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len = strlen(in);
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/* "../" prefix itself does not need quoting, but "in" might. */
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needquote = next_quote_pos(in, len) < len;
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strbuf_setlen(out, 0);
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strbuf_grow(out, len);
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if (needquote)
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strbuf_addch(out, '"');
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if (prefix) {
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int off = 0;
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while (prefix[off] && off < len && prefix[off] == in[off])
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if (prefix[off] == '/') {
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prefix += off + 1;
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in += off + 1;
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len -= off + 1;
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off = 0;
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} else
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off++;
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for (; *prefix; prefix++)
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if (*prefix == '/')
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strbuf_addstr(out, "../");
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}
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quote_c_style_counted (in, len, out, NULL, 1);
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if (needquote)
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strbuf_addch(out, '"');
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if (!out->len)
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strbuf_addstr(out, "./");
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return out->buf;
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}
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/*
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* C-style name unquoting.
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*
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* Quoted should point at the opening double quote.
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* + Returns 0 if it was able to unquote the string properly, and appends the
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* result in the strbuf `sb'.
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* + Returns -1 in case of error, and doesn't touch the strbuf. Though note
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* that this function will allocate memory in the strbuf, so calling
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* strbuf_release is mandatory whichever result unquote_c_style returns.
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*
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* Updates endp pointer to point at one past the ending double quote if given.
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*/
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int unquote_c_style(struct strbuf *sb, const char *quoted, const char **endp)
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{
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size_t oldlen = sb->len, len;
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int ch, ac;
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if (*quoted++ != '"')
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return -1;
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for (;;) {
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len = strcspn(quoted, "\"\\");
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strbuf_add(sb, quoted, len);
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quoted += len;
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switch (*quoted++) {
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case '"':
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if (endp)
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*endp = quoted;
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return 0;
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case '\\':
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break;
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default:
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goto error;
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}
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switch ((ch = *quoted++)) {
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case 'a': ch = '\a'; break;
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case 'b': ch = '\b'; break;
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case 'f': ch = '\f'; break;
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case 'n': ch = '\n'; break;
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case 'r': ch = '\r'; break;
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case 't': ch = '\t'; break;
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case 'v': ch = '\v'; break;
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case '\\': case '"':
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break; /* verbatim */
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/* octal values with first digit over 4 overflow */
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case '0': case '1': case '2': case '3':
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ac = ((ch - '0') << 6);
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if ((ch = *quoted++) < '0' || '7' < ch)
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goto error;
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ac |= ((ch - '0') << 3);
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if ((ch = *quoted++) < '0' || '7' < ch)
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goto error;
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ac |= (ch - '0');
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ch = ac;
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break;
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default:
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goto error;
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}
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strbuf_addch(sb, ch);
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}
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error:
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strbuf_setlen(sb, oldlen);
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return -1;
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}
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/* quoting as a string literal for other languages */
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void perl_quote_print(FILE *stream, const char *src)
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{
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const char sq = '\'';
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const char bq = '\\';
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char c;
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fputc(sq, stream);
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while ((c = *src++)) {
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if (c == sq || c == bq)
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fputc(bq, stream);
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fputc(c, stream);
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}
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fputc(sq, stream);
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}
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void python_quote_print(FILE *stream, const char *src)
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{
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const char sq = '\'';
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const char bq = '\\';
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const char nl = '\n';
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char c;
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fputc(sq, stream);
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while ((c = *src++)) {
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if (c == nl) {
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fputc(bq, stream);
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fputc('n', stream);
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continue;
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}
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if (c == sq || c == bq)
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fputc(bq, stream);
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fputc(c, stream);
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}
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fputc(sq, stream);
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}
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void tcl_quote_print(FILE *stream, const char *src)
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{
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char c;
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fputc('"', stream);
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while ((c = *src++)) {
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switch (c) {
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case '[': case ']':
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case '{': case '}':
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case '$': case '\\': case '"':
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fputc('\\', stream);
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default:
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fputc(c, stream);
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break;
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case '\f':
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fputs("\\f", stream);
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break;
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case '\r':
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fputs("\\r", stream);
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break;
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case '\n':
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fputs("\\n", stream);
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break;
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case '\t':
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fputs("\\t", stream);
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break;
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case '\v':
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fputs("\\v", stream);
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break;
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}
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}
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fputc('"', stream);
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}
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