[PATCH 2/4] quote: add "sq_dequote_to_argv" to put unwrapped args in an argv array

This new function unwraps the space separated shell quoted elements in
its first argument and put a copy of them in the argv array passed as
its second argument.

Signed-off-by: Christian Couder <redacted>
---
 quote.c |   17 +++++++++++++++++
 quote.h |    2 ++
 2 files changed, 19 insertions(+), 0 deletions(-)

diff --git a/quote.c b/quote.c
index 8cf0ef4..5b12a4a 100644
--- a/quote.c
+++ b/quote.c

@@ -120,6 +120,23 @@ char *sq_dequote(char *arg)
 	return sq_dequote_many(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_many(next, &next);
+		if (!dequoted)
+			return 1;
+		ALLOC_GROW(*argv, *nr + 1, *alloc);
+		(*argv)[(*nr)++] = xstrdup(dequoted);
+	} while (next);
+
+	return 0;
+}
+
 /* 1 means: quote as octal
  * 0 means: quote as octal if (quote_path_fully)
  * -1 means: never quote

diff --git a/quote.h b/quote.h
index c2f98e7..bbd0f09 100644
--- a/quote.h
+++ b/quote.h

@@ -47,6 +47,8 @@ extern char *sq_dequote(char *);
  */
 extern char *sq_dequote_many(char *arg, char **next);
 
+extern int sq_dequote_to_argv(char *arg, const char ***argv, int *nr, int *alloc);
+
 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);

-- 
1.6.2.1.404.gb0085.dirty

Christian Couder [off-list ref] writes:

Usually we signal an error with a negative value, e.g. -1.

+		ALLOC_GROW(*argv, *nr + 1, *alloc);
+		(*argv)[(*nr)++] = xstrdup(dequoted);

The original sq_dequote() interface takes advantage of the fact that the
result of single-quote unquoting is always shorter than the original and
it can rewrite the argument in-place to return the result.  I would expect
dequote_step() to retain that trait and allow the caller to use its return
value without xstrdup().

But please do not send in replacements just yet.

Le lundi 30 mars 2009, Junio C Hamano a écrit :

Christian Couder [off-list ref] writes:

quoted

This new function unwraps the space separated shell quoted elements in
its first argument and put a copy of them in the argv array passed as
its second argument.

Signed-off-by: Christian Couder <redacted>
---
 quote.c |   17 +++++++++++++++++
 quote.h |    2 ++
 2 files changed, 19 insertions(+), 0 deletions(-)

diff --git a/quote.c b/quote.c
index 8cf0ef4..5b12a4a 100644
--- a/quote.c
+++ b/quote.c

@@ -120,6 +120,23 @@ char *sq_dequote(char *arg)
 	return sq_dequote_many(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_many(next, &next);
+		if (!dequoted)
+			return 1;

Usually we signal an error with a negative value, e.g. -1.

quoted

+		ALLOC_GROW(*argv, *nr + 1, *alloc);
+		(*argv)[(*nr)++] = xstrdup(dequoted);

The original sq_dequote() interface takes advantage of the fact that the
result of single-quote unquoting is always shorter than the original and
it can rewrite the argument in-place to return the result.  I would
expect dequote_step() to retain that trait and allow the caller to use
its return value without xstrdup().

I thought that it could be dangerous not to use xstrdup, as users of this 
function might want to free the strings in argv one by one. But I don't 
care much.

Thanks,
Christian.