From e7ddb294b84a2f012019d11f9fa5fad90dc304e5 Mon Sep 17 00:00:00 2001
From: midipix <writeonce@midipix.org>
Date: Sat, 2 Apr 2016 11:42:02 -0400
Subject: slbt_reset_arguments(): initial implementation and integration.

---
 include/slibtool/slibtool.h |  1 +
 src/logic/slbt_exec_ctx.c   | 32 ++++++++++++++++++++++++++++++--
 src/logic/slbt_exec_link.c  |  3 +++
 3 files changed, 34 insertions(+), 2 deletions(-)

diff --git a/include/slibtool/slibtool.h b/include/slibtool/slibtool.h
index a9dbf6e..c5100b9 100644
--- a/include/slibtool/slibtool.h
+++ b/include/slibtool/slibtool.h
@@ -180,6 +180,7 @@ slbt_api void slbt_free_unit_ctx	(struct slbt_unit_ctx *);
 
 slbt_api int  slbt_get_exec_ctx		(const struct slbt_driver_ctx *, struct slbt_exec_ctx **);
 slbt_api void slbt_free_exec_ctx	(struct slbt_exec_ctx *);
+slbt_api void slbt_reset_arguments	(struct slbt_exec_ctx *);
 slbt_api void slbt_reset_placeholders	(struct slbt_exec_ctx *);
 
 slbt_api int  slbt_exec_compile		(const struct slbt_driver_ctx *, struct slbt_exec_ctx *);
diff --git a/src/logic/slbt_exec_ctx.c b/src/logic/slbt_exec_ctx.c
index 1fbcca3..3eec822 100644
--- a/src/logic/slbt_exec_ctx.c
+++ b/src/logic/slbt_exec_ctx.c
@@ -16,6 +16,8 @@
 struct slbt_exec_ctx_impl {
 	int			argc;
 	char *			args;
+	char *			shadow;
+	size_t			size;
 	struct slbt_exec_ctx	ctx;
 	char *			vbuffer[];
 };
@@ -57,8 +59,10 @@ static struct slbt_exec_ctx_impl * slbt_exec_ctx_alloc(
 {
 	struct slbt_exec_ctx_impl *	ictx;
 	size_t				size;
+	size_t				vsize;
 	int				argc;
 	char *				args;
+	char *				shadow;
 	char *				csrc;
 	char **				parg;
 
@@ -102,16 +106,25 @@ static struct slbt_exec_ctx_impl * slbt_exec_ctx_alloc(
 	if (!(args = malloc(size)))
 		return 0;
 
-	size = sizeof(*ictx) + (2*(argc+1)+SLBT_ARGV_SPARE_PTRS)*sizeof(char *);
+	if (!(shadow = malloc(size))) {
+		free(args);
+		return 0;
+	}
+
+	vsize = sizeof(*ictx) + (2*(argc+1)+SLBT_ARGV_SPARE_PTRS)*sizeof(char *);
 
-	if (!(ictx = calloc(1,size))) {
+	if (!(ictx = calloc(1,vsize))) {
 		free(args);
+		free(shadow);
 		return 0;
 	}
 
 	ictx->args = args;
 	ictx->argc = argc;
 
+	ictx->size   = size;
+	ictx->shadow = shadow;
+
 	ictx->ctx.csrc = csrc;
 
 	return ictx;
@@ -269,6 +282,9 @@ int  slbt_get_exec_ctx(
 			+ sizeof('\0');
 	}
 
+	/* argument strings shadow copy */
+	memcpy(ictx->shadow,ictx->args,ictx->size);
+
 	*ectx = &ictx->ctx;
 	return 0;
 }
@@ -279,6 +295,7 @@ static int slbt_free_exec_ctx_impl(
 	int				status)
 {
 	free(ictx->args);
+	free(ictx->shadow);
 	free (ictx);
 	return status;
 }
@@ -297,6 +314,17 @@ void slbt_free_exec_ctx(struct slbt_exec_ctx * ctx)
 }
 
 
+void slbt_reset_arguments(struct slbt_exec_ctx * ectx)
+{
+	struct slbt_exec_ctx_impl *	ictx;
+	uintptr_t			addr;
+
+	addr = (uintptr_t)ectx - offsetof(struct slbt_exec_ctx_impl,ctx);
+	ictx = (struct slbt_exec_ctx_impl *)addr;
+	memcpy(ictx->args,ictx->shadow,ictx->size);
+}
+
+
 void slbt_reset_placeholders(struct slbt_exec_ctx * ectx)
 {
 	*ectx->dpic = "-USLIBTOOL_PLACEHOLDER_DPIC";
diff --git a/src/logic/slbt_exec_link.c b/src/logic/slbt_exec_link.c
index 1739c63..9c07517 100644
--- a/src/logic/slbt_exec_link.c
+++ b/src/logic/slbt_exec_link.c
@@ -58,6 +58,9 @@ static int slbt_exec_link_static_archive(
 	char		program[PATH_MAX];
 	char		output [PATH_MAX];
 
+	/* initial state */
+	slbt_reset_arguments(ectx);
+
 	/* placeholders */
 	slbt_reset_placeholders(ectx);
 
-- 
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