Add support for Visual Studio 2019

external/libelf/src/cntl.c

@@ -0,0 +1,71 @@
+/*
+cntl.c - implementation of the elf_cntl(3) function.
+Copyright (C) 1995 - 1998 Michael Riepe
+
+This library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public
+License as published by the Free Software Foundation; either
+version 2 of the License, or (at your option) any later version.
+
+This library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with this library; if not, write to the Free Software
+Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
+*/
+
+#include <private.h>
+
+#ifndef lint
+static const char rcsid[] = "@(#) $Id: cntl.c,v 1.7 2008/05/23 08:15:34 michael Exp $";
+#endif /* lint */
+
+int
+elf_cntl(Elf *elf, Elf_Cmd cmd) {
+    Elf_Scn *scn;
+    Elf *child;
+
+    if (!elf) {
+	return -1;
+    }
+    elf_assert(elf->e_magic == ELF_MAGIC);
+    if (cmd == ELF_C_FDREAD) {
+	if (!elf->e_readable) {
+	    seterr(ERROR_WRONLY);
+	    return -1;
+	}
+    }
+    else if (cmd != ELF_C_FDDONE) {
+	seterr(ERROR_INVALID_CMD);
+	return -1;
+    }
+    if (elf->e_disabled) {
+	return 0;
+    }
+    if (elf->e_kind == ELF_K_AR) {
+	for (child = elf->e_members; child; child = child->e_link) {
+	    elf_assert(elf == child->e_parent);
+	    if (elf_cntl(child, cmd)) {
+		return -1;
+	    }
+	}
+    }
+    else if (elf->e_kind == ELF_K_ELF && cmd == ELF_C_FDREAD) {
+	if (!elf->e_ehdr && !_elf_cook(elf)) {
+	    return -1;
+	}
+	for (scn = elf->e_scn_1; scn; scn = scn->s_link) {
+	    if (scn->s_index == SHN_UNDEF || scn->s_type == SHT_NULL) {
+		continue;
+	    }
+	    else if (!elf_getdata(scn, NULL)) {
+		return -1;
+	    }
+	}
+    }
+    elf->e_disabled = 1;
+    return 0;
+}