ar mode: slbt_get_archive_ctx(): initial implementation and integration.

3 files changed, 149 insertions, 0 deletions

diff --git a/src/arbits/slbt_archive_ctx.c b/src/arbits/slbt_archive_ctx.c
new file mode 100644
index 0000000..c9c1a7d
--- /dev/null
+++ b/src/arbits/slbt_archive_ctx.c
@@ -0,0 +1,106 @@
+/*******************************************************************/
+/*  slibtool: a skinny libtool implementation, written in C        */
+/*  Copyright (C) 2016--2024  SysDeer Technologies, LLC            */
+/*  Released under the Standard MIT License; see COPYING.SLIBTOOL. */
+/*******************************************************************/
+
+#include <stdint.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/mman.h>
+
+#include <slibtool/slibtool.h>
+#include "slibtool_driver_impl.h"
+#include "slibtool_errinfo_impl.h"
+
+static int slbt_map_raw_archive(
+	const struct slbt_driver_ctx *	dctx,
+	int				fd,
+	const char *			path,
+	int				prot,
+	struct slbt_raw_archive *	map)
+{
+	struct slbt_input mapinfo = {0,0};
+
+	if (slbt_map_input(dctx,fd,path,prot,&mapinfo) < 0)
+		return SLBT_NESTED_ERROR(dctx);
+
+	if (mapinfo.size == 0)
+		return SLBT_CUSTOM_ERROR(
+			dctx,
+			SLBT_ERR_AR_EMPTY_FILE);
+
+	map->map_addr = mapinfo.addr;
+	map->map_size = mapinfo.size;
+
+	return 0;
+}
+
+static int slbt_unmap_raw_archive(struct slbt_raw_archive * map)
+{
+	struct slbt_input mapinfo;
+
+	mapinfo.addr = map->map_addr;
+	mapinfo.size = map->map_size;
+
+	return slbt_unmap_input(&mapinfo);
+}
+
+static int slbt_free_archive_ctx_impl(struct slbt_archive_ctx_impl * ctx, int ret)
+{
+	if (ctx) {
+		slbt_free_archive_meta(ctx->meta);
+		slbt_unmap_raw_archive(&ctx->map);
+		free(ctx);
+	}
+
+	return ret;
+}
+
+int slbt_get_archive_ctx(
+	const struct slbt_driver_ctx *	dctx,
+	const char *			path,
+	struct slbt_archive_ctx **		pctx)
+{
+	struct slbt_archive_ctx_impl *	ctx;
+	int				prot;
+
+	if (!(ctx = calloc(1,sizeof(*ctx))))
+		return SLBT_BUFFER_ERROR(dctx);
+
+	slbt_driver_set_arctx(
+		dctx,0,path);
+
+	prot = (dctx->cctx->actflags & SLBT_ACTION_MAP_READWRITE)
+		? PROT_READ | PROT_WRITE
+		: PROT_READ;
+
+	if (slbt_map_raw_archive(dctx,-1,path,prot,&ctx->map))
+		return slbt_free_archive_ctx_impl(ctx,
+			SLBT_NESTED_ERROR(dctx));
+
+	if (slbt_get_archive_meta(dctx,&ctx->map,&ctx->meta))
+		return slbt_free_archive_ctx_impl(ctx,
+			SLBT_NESTED_ERROR(dctx));
+
+	ctx->path	= path;
+	ctx->actx.path	= &ctx->path;
+	ctx->actx.map	= &ctx->map;
+	ctx->actx.meta	= ctx->meta;
+
+	*pctx = &ctx->actx;
+	return 0;
+}
+
+void slbt_free_archive_ctx(struct slbt_archive_ctx * ctx)
+{
+	struct slbt_archive_ctx_impl *	ictx;
+	uintptr_t			addr;
+
+	if (ctx) {
+		addr = (uintptr_t)ctx - offsetof(struct slbt_archive_ctx_impl,actx);
+		ictx = (struct slbt_archive_ctx_impl *)addr;
+		slbt_free_archive_ctx_impl(ictx,0);
+	}
+}
diff --git a/src/internal/slibtool_driver_impl.h b/src/internal/slibtool_driver_impl.h
index 0293308..388e1cf 100644
--- a/src/internal/slibtool_driver_impl.h
+++ b/src/internal/slibtool_driver_impl.h
@@ -116,6 +116,10 @@ struct slbt_driver_ctx_impl {
 	struct slbt_host_strs	ahost;
 	struct slbt_fd_ctx	fdctx;
 	struct slbt_obj_list *	objlistv;
+
+	const struct slbt_archive_ctx * arctx;
+	const char *                    arpath;
+
 	char *			libname;
 	char *			dargs;
 	char **			dargv;
@@ -141,6 +145,13 @@ struct slbt_exec_ctx_impl {
 	char *			vbuffer[];
 };
 
+struct slbt_archive_ctx_impl {
+	const char *			path;
+	struct slbt_raw_archive		map;
+	struct slbt_archive_meta *	meta;
+	struct slbt_archive_ctx		actx;
+};
+
 static inline struct slbt_driver_ctx_impl * slbt_get_driver_ictx(const struct slbt_driver_ctx * dctx)
 {
 	uintptr_t addr;
@@ -153,6 +164,19 @@ static inline struct slbt_driver_ctx_impl * slbt_get_driver_ictx(const struct sl
 	return 0;
 }
 
+static inline void slbt_driver_set_arctx(
+	const struct slbt_driver_ctx *  dctx,
+	const struct slbt_archive_ctx * arctx,
+	const char *                    arpath)
+{
+	struct slbt_driver_ctx_impl * ictx;
+
+
+	ictx         = slbt_get_driver_ictx(dctx);
+	ictx->arctx  = arctx;
+	ictx->arpath = arpath;
+}
+
 static inline char ** slbt_driver_envp(const struct slbt_driver_ctx * dctx)
 {
 	struct slbt_driver_ctx_impl * ictx;
diff --git a/src/logic/slbt_exec_ar.c b/src/logic/slbt_exec_ar.c
index a68ff03..56eee4e 100644
--- a/src/logic/slbt_exec_ar.c
+++ b/src/logic/slbt_exec_ar.c
@@ -71,6 +71,7 @@ int slbt_exec_ar(
 	char **				argv;
 	char **				iargv;
 	struct slbt_archive_ctx **	arctxv;
+	struct slbt_archive_ctx **	arctxp;
 	const char **			unitv;
 	const char **			unitp;
 	size_t				nunits;
@@ -160,7 +161,25 @@ int slbt_exec_ar(
 		if (!entry->fopt)
 			*unitp++ = entry->arg;
 
+	/* archive context vector initialization */
+	for (unitp=unitv,arctxp=arctxv; *unitp; unitp++,arctxp++) {
+		if (slbt_get_archive_ctx(dctx,*unitp,arctxp) < 0) {
+			for (arctxp=arctxv; *arctxp; arctxp++)
+				slbt_free_archive_ctx(*arctxp);
+
+			free(unitv);
+			free(arctxv);
+
+			return slbt_exec_ar_fail(
+				actx,meta,
+				SLBT_NESTED_ERROR(dctx));
+		}
+	}
+
 	/* all done */
+	for (arctxp=arctxv; *arctxp; arctxp++)
+		slbt_free_archive_ctx(*arctxp);
+
 	free(unitv);
 	free(arctxv);