From a313a4648ed153a53296f1e6b1bcda83b3c9f4da Mon Sep 17 00:00:00 2001
From: midipix <writeonce@midipix.org>
Date: Tue, 19 Apr 2016 12:08:51 -0400
Subject: driver: added slbt_set_alternate_host(), slbt_reset_alternate_host().

---
 include/slibtool/slibtool.h         |  6 ++++
 src/driver/slbt_driver_ctx.c        | 55 +++++++++++++++++++++++++++++++++++++
 src/internal/slibtool_driver_impl.h |  1 +
 3 files changed, 62 insertions(+)

diff --git a/include/slibtool/slibtool.h b/include/slibtool/slibtool.h
index 533be58..7cc387d 100644
--- a/include/slibtool/slibtool.h
+++ b/include/slibtool/slibtool.h
@@ -160,6 +160,9 @@ struct slbt_common_ctx {
 	struct slbt_host_params		host;
 	struct slbt_host_params		cfgmeta;
 	struct slbt_flavor_settings	settings;
+	struct slbt_host_params		ahost;
+	struct slbt_host_params		acfgmeta;
+	struct slbt_flavor_settings	asettings;
 	struct slbt_version_info	verinfo;
 	enum slbt_mode			mode;
 	enum slbt_tag			tag;
@@ -212,6 +215,9 @@ slbt_api int  slbt_exec_compile		(const struct slbt_driver_ctx *, struct slbt_ex
 slbt_api int  slbt_exec_install		(const struct slbt_driver_ctx *, struct slbt_exec_ctx *);
 slbt_api int  slbt_exec_link		(const struct slbt_driver_ctx *, struct slbt_exec_ctx *);
 
+slbt_api int  slbt_set_alternate_host	(const struct slbt_driver_ctx *, const char * host, const char * flavor);
+slbt_api void slbt_reset_alternate_host	(const struct slbt_driver_ctx *);
+
 /* helper api */
 slbt_api int  slbt_map_input		(int fd, const char * path, int prot, struct slbt_input *);
 slbt_api int  slbt_unmap_input		(struct slbt_input *);
diff --git a/src/driver/slbt_driver_ctx.c b/src/driver/slbt_driver_ctx.c
index eac0ac6..68ddee8 100644
--- a/src/driver/slbt_driver_ctx.c
+++ b/src/driver/slbt_driver_ctx.c
@@ -441,6 +441,8 @@ static void slbt_free_host_params(struct slbt_host_strs * host)
 
 	if (host->dlltool)
 		free(host->dlltool);
+
+	memset(host,0,sizeof(*host));
 }
 
 static void slbt_init_flavor_settings(
@@ -909,3 +911,56 @@ void slbt_free_driver_ctx(struct slbt_driver_ctx * ctx)
 		slbt_free_driver_ctx_impl(ictx);
 	}
 }
+
+void slbt_reset_alternate_host(const struct slbt_driver_ctx * ctx)
+{
+	struct slbt_driver_ctx_alloc *	ictx;
+	uintptr_t			addr;
+
+	addr = (uintptr_t)ctx - offsetof(struct slbt_driver_ctx_alloc,ctx);
+	addr = addr - offsetof(struct slbt_driver_ctx_impl,ctx);
+	ictx = (struct slbt_driver_ctx_alloc *)addr;
+
+	slbt_free_host_params(&ictx->ctx.ahost);
+}
+
+int  slbt_set_alternate_host(
+	const struct slbt_driver_ctx *	ctx,
+	const char *			host,
+	const char *			flavor)
+{
+	struct slbt_driver_ctx_alloc *	ictx;
+	uintptr_t			addr;
+
+	addr = (uintptr_t)ctx - offsetof(struct slbt_driver_ctx_alloc,ctx);
+	addr = addr - offsetof(struct slbt_driver_ctx_impl,ctx);
+	ictx = (struct slbt_driver_ctx_alloc *)addr;
+	slbt_free_host_params(&ictx->ctx.ahost);
+
+	if (!(ictx->ctx.ahost.host = strdup(host)))
+		return -1;
+
+	if (!(ictx->ctx.ahost.flavor = strdup(flavor))) {
+		slbt_free_host_params(&ictx->ctx.ahost);
+		return -1;
+	}
+
+	ictx->ctx.cctx.ahost.host   = ictx->ctx.ahost.host;
+	ictx->ctx.cctx.ahost.flavor = ictx->ctx.ahost.flavor;
+
+	if (slbt_init_host_params(
+			ctx->cctx,
+			&ictx->ctx.ahost,
+			&ictx->ctx.cctx.ahost,
+			&ictx->ctx.cctx.acfgmeta)) {
+		slbt_free_host_params(&ictx->ctx.ahost);
+		return -1;
+	}
+
+	slbt_init_flavor_settings(
+		&ictx->ctx.cctx,
+		&ictx->ctx.cctx.ahost,
+		&ictx->ctx.cctx.asettings);
+
+	return 0;
+}
diff --git a/src/internal/slibtool_driver_impl.h b/src/internal/slibtool_driver_impl.h
index 466a4b3..b7a089f 100644
--- a/src/internal/slibtool_driver_impl.h
+++ b/src/internal/slibtool_driver_impl.h
@@ -64,6 +64,7 @@ struct slbt_driver_ctx_impl {
 	struct slbt_common_ctx	cctx;
 	struct slbt_driver_ctx	ctx;
 	struct slbt_host_strs	host;
+	struct slbt_host_strs	ahost;
 	char *			libname;
 	char **			targv;
 	char **			cargv;
-- 
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