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5558e55c06
Love it or hate it, some people actually still program in Tcl. Some of those programs are meant for interfacing with Git. Programs such as gitk and git-gui. It may be useful to have Tcl-safe output available from for-each-ref, just like shell, Perl and Python already enjoy. Thanks to Sergey Vlasov for pointing out the horrible flaws in the first and second version of this patch, and steering me in the right direction for Tcl value quoting. Signed-off-by: Shawn O. Pearce <spearce@spearce.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
424 lines
8.1 KiB
C
424 lines
8.1 KiB
C
#include "cache.h"
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#include "quote.h"
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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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#undef EMIT
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#define EMIT(x) do { if (++len < n) *bp++ = (x); } while(0)
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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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size_t sq_quote_buf(char *dst, size_t n, const char *src)
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{
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char c;
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char *bp = dst;
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size_t len = 0;
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EMIT('\'');
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while ((c = *src++)) {
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if (need_bs_quote(c)) {
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EMIT('\'');
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EMIT('\\');
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EMIT(c);
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EMIT('\'');
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} else {
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EMIT(c);
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}
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}
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EMIT('\'');
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if ( n )
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*bp = 0;
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return len;
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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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char *sq_quote(const char *src)
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{
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char *buf;
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size_t cnt;
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cnt = sq_quote_buf(NULL, 0, src) + 1;
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buf = xmalloc(cnt);
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sq_quote_buf(buf, cnt, src);
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return buf;
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}
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char *sq_quote_argv(const char** argv, int count)
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{
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char *buf, *to;
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int i;
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size_t len = 0;
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/* Count argv if needed. */
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if (count < 0) {
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for (count = 0; argv[count]; count++)
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; /* just counting */
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}
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/* Special case: no argv. */
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if (!count)
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return xcalloc(1,1);
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/* Get destination buffer length. */
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for (i = 0; i < count; i++)
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len += sq_quote_buf(NULL, 0, argv[i]) + 1;
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/* Alloc destination buffer. */
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to = buf = xmalloc(len + 1);
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/* Copy into destination buffer. */
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for (i = 0; i < count; ++i) {
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*to++ = ' ';
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to += sq_quote_buf(to, len, argv[i]);
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}
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return buf;
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}
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/*
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* Append a string to a string buffer, with or without shell quoting.
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* Return true if the buffer overflowed.
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*/
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int add_to_string(char **ptrp, int *sizep, const char *str, int quote)
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{
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char *p = *ptrp;
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int size = *sizep;
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int oc;
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int err = 0;
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if (quote)
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oc = sq_quote_buf(p, size, str);
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else {
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oc = strlen(str);
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memcpy(p, str, (size <= oc) ? size - 1 : oc);
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}
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if (size <= oc) {
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err = 1;
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oc = size - 1;
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}
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*ptrp += oc;
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**ptrp = '\0';
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*sizep -= oc;
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return err;
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}
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char *sq_dequote(char *arg)
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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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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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return NULL;
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}
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}
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}
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/*
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* C-style name quoting.
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*
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* Does one of three things:
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*
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* (1) if outbuf and outfp are both NULL, inspect the input name and
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* counts the number of bytes that are needed to hold c_style
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* quoted version of name, counting the double quotes around
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* it but not terminating NUL, and returns it. However, if name
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* does not need c_style quoting, it returns 0.
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*
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* (2) if outbuf is not NULL, it must point at a buffer large enough
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* to hold the c_style quoted version of name, enclosing double
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* quotes, and terminating NUL. Fills outbuf with c_style quoted
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* version of name enclosed in double-quote pair. Return value
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* is undefined.
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*
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* (3) if outfp is not NULL, outputs c_style quoted version of name,
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* but not enclosed in double-quote pair. Return value is undefined.
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*/
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static int quote_c_style_counted(const char *name, int namelen,
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char *outbuf, FILE *outfp, int no_dq)
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{
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#undef EMIT
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#define EMIT(c) \
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(outbuf ? (*outbuf++ = (c)) : outfp ? fputc(c, outfp) : (count++))
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#define EMITQ() EMIT('\\')
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const char *sp;
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int ch, count = 0, needquote = 0;
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if (!no_dq)
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EMIT('"');
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for (sp = name; sp < name + namelen; sp++) {
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ch = *sp;
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if (!ch)
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break;
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if ((ch < ' ') || (ch == '"') || (ch == '\\') ||
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(ch >= 0177)) {
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needquote = 1;
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switch (ch) {
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case '\a': EMITQ(); ch = 'a'; break;
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case '\b': EMITQ(); ch = 'b'; break;
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case '\f': EMITQ(); ch = 'f'; break;
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case '\n': EMITQ(); ch = 'n'; break;
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case '\r': EMITQ(); ch = 'r'; break;
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case '\t': EMITQ(); ch = 't'; break;
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case '\v': EMITQ(); ch = 'v'; break;
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case '\\': /* fallthru */
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case '"': EMITQ(); break;
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default:
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/* octal */
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EMITQ();
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EMIT(((ch >> 6) & 03) + '0');
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EMIT(((ch >> 3) & 07) + '0');
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ch = (ch & 07) + '0';
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break;
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}
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}
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EMIT(ch);
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}
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if (!no_dq)
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EMIT('"');
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if (outbuf)
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*outbuf = 0;
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return needquote ? count : 0;
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}
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int quote_c_style(const char *name, char *outbuf, FILE *outfp, int no_dq)
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{
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int cnt = strlen(name);
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return quote_c_style_counted(name, cnt, outbuf, outfp, no_dq);
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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. Returns
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* an allocated memory that holds unquoted name, which the caller
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* should free when done. Updates endp pointer to point at
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* one past the ending double quote if given.
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*/
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char *unquote_c_style(const char *quoted, const char **endp)
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{
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const char *sp;
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char *name = NULL, *outp = NULL;
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int count = 0, ch, ac;
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#undef EMIT
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#define EMIT(c) (outp ? (*outp++ = (c)) : (count++))
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if (*quoted++ != '"')
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return NULL;
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while (1) {
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/* first pass counts and allocates, second pass fills */
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for (sp = quoted; (ch = *sp++) != '"'; ) {
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if (ch == '\\') {
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switch (ch = *sp++) {
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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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case '0':
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case '1':
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case '2':
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case '3':
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case '4':
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case '5':
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case '6':
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case '7':
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/* octal */
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ac = ((ch - '0') << 6);
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if ((ch = *sp++) < '0' || '7' < ch)
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return NULL;
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ac |= ((ch - '0') << 3);
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if ((ch = *sp++) < '0' || '7' < ch)
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return NULL;
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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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return NULL; /* malformed */
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}
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}
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EMIT(ch);
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}
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if (name) {
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*outp = 0;
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if (endp)
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*endp = sp;
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return name;
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}
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outp = name = xmalloc(count + 1);
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}
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}
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void write_name_quoted(const char *prefix, int prefix_len,
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const char *name, int quote, FILE *out)
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{
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int needquote;
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if (!quote) {
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no_quote:
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if (prefix_len)
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fprintf(out, "%.*s", prefix_len, prefix);
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fputs(name, out);
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return;
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}
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needquote = 0;
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if (prefix_len)
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needquote = quote_c_style_counted(prefix, prefix_len,
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NULL, NULL, 0);
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if (!needquote)
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needquote = quote_c_style(name, NULL, NULL, 0);
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if (needquote) {
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fputc('"', out);
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if (prefix_len)
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quote_c_style_counted(prefix, prefix_len,
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NULL, out, 1);
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quote_c_style(name, NULL, out, 1);
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fputc('"', out);
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}
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else
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goto no_quote;
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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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