quote: implement "sq_dequote_many" to unwrap many args in one string

The sq_dequote() function does not allow parsing a string with more than
one single-quoted parameter easily; use its code to implement a new API
sq_dequote_step() to allow the caller iterate through such a string to
parse them one-by-one.  The original sq_dequote() becomes a thin wrapper
around it.

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/quote.h b/quote.h
index c5eea6f18..2315105fa 100644
--- a/quote.h
+++ b/quote.h
@@ -39,6 +39,14 @@ extern void sq_quote_argv(struct strbuf *, const char **argv, size_t maxlen);
  */
 extern char *sq_dequote(char *);
 
+/*
+ * Same as the above, but can be used to unwrap many arguments in the
+ * same string separated by space. "next" is changed to point to the
+ * next argument that should be passed as first parameter. When there
+ * is no more argument to be dequoted, "next" is updated to point to NULL.
+ */
+extern char *sq_dequote_step(char *arg, char **next);
+
 extern int unquote_c_style(struct strbuf *, const char *quoted, const char **endp);
 extern size_t quote_c_style(const char *name, struct strbuf *, FILE *, int no_dq);
 extern void quote_two_c_style(struct strbuf *, const char *, const char *, int);