From f7b3fdbb145ce292ae9c468c63b6d32c1a75ffde Mon Sep 17 00:00:00 2001
From: midipix <writeonce@midipix.org>
Date: Feb 20 2024 05:12:52 +0000
Subject: utility api's: added slbt_util_create_mapfile().


---

diff --git a/include/slibtool/slibtool.h b/include/slibtool/slibtool.h
index d80a00e..38d47a0 100644
--- a/include/slibtool/slibtool.h
+++ b/include/slibtool/slibtool.h
@@ -390,6 +390,8 @@ slbt_api int  slbt_host_flavor_settings (const char *, const struct slbt_flavor_
 slbt_api int  slbt_util_import_archive  (const struct slbt_driver_ctx *, struct slbt_exec_ctx *,
                                          char * dstarchive, char * srcarchive);
 
+slbt_api int  slbt_util_create_mapfile  (const struct slbt_symlist_ctx *, const char *, mode_t);
+
 slbt_api int  slbt_util_copy_file       (const struct slbt_driver_ctx *, struct slbt_exec_ctx *,
                                          char * src, char * dst);
 
diff --git a/project/common.mk b/project/common.mk
index 433711f..fbd81fd 100644
--- a/project/common.mk
+++ b/project/common.mk
@@ -21,6 +21,7 @@ API_SRCS = \
 	src/driver/slbt_version_info.c \
 	src/host/slbt_host_params.c \
 	src/util/slbt_archive_import.c \
+	src/util/slbt_create_mapfile.c \
 	src/util/slbt_copy_file.c \
 	src/util/slbt_dump_machine.c \
 	src/util/slbt_map_input.c \
diff --git a/src/internal/slibtool_driver_impl.h b/src/internal/slibtool_driver_impl.h
index 8420532..5bc421d 100644
--- a/src/internal/slibtool_driver_impl.h
+++ b/src/internal/slibtool_driver_impl.h
@@ -320,6 +320,18 @@ static inline struct slbt_driver_ctx_impl * slbt_get_driver_ictx(const struct sl
 	return 0;
 }
 
+static inline struct slbt_symlist_ctx_impl * slbt_get_symlist_ictx(const struct slbt_symlist_ctx * sctx)
+{
+	uintptr_t addr;
+
+	if (sctx) {
+		addr = (uintptr_t)sctx - offsetof(struct slbt_symlist_ctx_impl,sctx);
+		return (struct slbt_symlist_ctx_impl *)addr;
+	}
+
+	return 0;
+}
+
 static inline void slbt_driver_set_arctx(
 	const struct slbt_driver_ctx *  dctx,
 	const struct slbt_archive_ctx * arctx,
diff --git a/src/util/slbt_create_mapfile.c b/src/util/slbt_create_mapfile.c
new file mode 100644
index 0000000..d0f5d95
--- /dev/null
+++ b/src/util/slbt_create_mapfile.c
@@ -0,0 +1,127 @@
+/*******************************************************************/
+/*  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 <time.h>
+#include <locale.h>
+#include <regex.h>
+#include <inttypes.h>
+#include <slibtool/slibtool.h>
+#include <slibtool/slibtool_output.h>
+#include "slibtool_driver_impl.h"
+#include "slibtool_dprintf_impl.h"
+#include "slibtool_errinfo_impl.h"
+#include "slibtool_ar_impl.h"
+
+/****************************************************/
+/* Generate a linker version script (aka mapfile)   */
+/* that could be passed to the host linker.         */
+/*                                                  */
+/* Since the provided symbol list is host-neautral, */
+/* prepend symbol names with an underscore whenever */
+/* necessary.                                       */
+/****************************************************/
+
+static int slbt_is_strong_coff_symbol(const char * sym)
+{
+	return strncmp(sym,"__imp_",6) && strncmp(sym,".weak.",6);
+}
+
+static int slbt_util_output_mapfile_impl(
+	const struct slbt_driver_ctx *  dctx,
+	const struct slbt_symlist_ctx * sctx,
+	int                             fdout)
+{
+	bool            fcoff;
+	bool            fmach;
+	const char **   symv;
+	const char **   symstrv;
+
+	fmach = !strcmp(dctx->cctx->host.flavor,"darwin");
+
+	fcoff = !strcmp(dctx->cctx->host.flavor,"midipix");
+	fcoff = fcoff || !strcmp(dctx->cctx->host.flavor,"cygwin");
+	fcoff = fcoff || !strcmp(dctx->cctx->host.flavor,"mingw");
+	fcoff = fcoff || !strcmp(dctx->cctx->host.flavor,"msys2");
+
+	if (fcoff) {
+		if (slbt_dprintf(fdout,"EXPORTS\n") < 0)
+			return SLBT_SYSTEM_ERROR(dctx,0);
+	} else if (fmach) {
+		if (slbt_dprintf(fdout,"# export_list, underscores prepended\n") < 0)
+			return SLBT_SYSTEM_ERROR(dctx,0);
+	} else {
+		if (slbt_dprintf(fdout,"{\n" "\t" "global:\n") < 0)
+			return SLBT_SYSTEM_ERROR(dctx,0);
+	}
+
+	symstrv = sctx->symstrv;
+
+	for (symv=symstrv; *symv; symv++) {
+		if (!fcoff || slbt_is_strong_coff_symbol(*symv)) {
+			if (fcoff) {
+				if (slbt_dprintf(fdout,"%s\n",*symv) < 0)
+					return SLBT_SYSTEM_ERROR(dctx,0);
+			} else if (fmach) {
+				if (slbt_dprintf(fdout,"_%s\n",*symv) < 0)
+					return SLBT_SYSTEM_ERROR(dctx,0);
+			} else {
+				if (slbt_dprintf(fdout,"\t\t%s;\n",*symv) < 0)
+					return SLBT_SYSTEM_ERROR(dctx,0);
+			}
+		}
+	}
+
+	if (!fcoff && !fmach)
+		if (slbt_dprintf(fdout,"\n\t" "local:\n" "\t\t*;\n" "};\n") < 0)
+			return SLBT_SYSTEM_ERROR(dctx,0);
+
+	return 0;
+}
+
+
+static int slbt_util_create_mapfile_impl(
+	const struct slbt_symlist_ctx *   sctx,
+	const char *                      path,
+	mode_t                            mode)
+{
+	int                             ret;
+	const struct slbt_driver_ctx *  dctx;
+	struct slbt_fd_ctx              fdctx;
+	int                             fdout;
+
+	dctx = (slbt_get_symlist_ictx(sctx))->dctx;
+
+	if (slbt_lib_get_driver_fdctx(dctx,&fdctx) < 0)
+		return SLBT_NESTED_ERROR(dctx);
+
+	if (path) {
+		if ((fdout = openat(
+				fdctx.fdcwd,path,
+				O_WRONLY|O_CREAT|O_TRUNC,
+				mode)) < 0)
+			return SLBT_SYSTEM_ERROR(dctx,0);
+	} else {
+		fdout = fdctx.fdout;
+	}
+
+	ret = slbt_util_output_mapfile_impl(
+		dctx,sctx,fdout);
+
+	if (path) {
+		close(fdout);
+	}
+
+	return ret;
+}
+
+
+int slbt_util_create_mapfile(
+	const struct slbt_symlist_ctx *   sctx,
+	const char *                      path,
+	mode_t                            mode)
+{
+	return slbt_util_create_mapfile_impl(sctx,path,mode);
+}