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+/* Generic BFD support for file formats.
+ Copyright (C) 1990-1991 Free Software Foundation, Inc.
+ Written by Cygnus Support.
+
+This file is part of BFD, the Binary File Descriptor library.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program 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 General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+/*doc*
+@section File Formats
+A format is a BFD concept of high level file contents. The
+formats supported by BFD are:
+@table @code
+@item bfd_object
+The BFD may contain data, symbols, relocations and debug info.
+@item bfd_archive
+The BFD contains other BFDs and an optional index.
+@item bfd_core
+The BFD contains the result of an executable core dump.
+@end table
+*/
+#include "sysdep.h"
+#include "bfd.h"
+#include "libbfd.h"
+
+
+extern bfd_target *target_vector[];
+extern bfd_target *default_vector[];
+
+
+/*proto*
+*i bfd_check_format
+This routine is supplied a BFD and a format. It attempts to verify if
+the file attatched to the BFD is indeed compatible with the format
+specified (ie, one of @code{bfd_object}, @code{bfd_archive} or
+@code{bfd_core}).
+
+If the BFD has been set to a specific @var{target} before the call,
+only the named target and format combination will be checked. If the
+target has not been set, or has been set to @code{default} then all
+the known target backends will be interrogated to determine a match.
+
+The function returns @code{true} on success, otherwise @code{false}
+with one of the following error codes:
+@table @code
+@item
+invalid_operation
+if @code{format} is not one of @code{bfd_object}, @code{bfd_archive}
+or @code{bfd_core}.
+@item system_call_error
+if an error occured during a read - even some file mismatches can
+cause system_call_errros
+@item file_not_recognised
+none of the backends recognised the file format
+@item file_ambiguously_recognized
+more than one backend recognised the file format.
+@end table
+*; PROTO(boolean, bfd_check_format, (bfd *abfd, bfd_format format));
+*-*/
+
+boolean
+DEFUN(bfd_check_format,(abfd, format),
+ bfd *abfd AND
+ bfd_format format)
+{
+ bfd_target **target, *save_targ, *right_targ;
+ int match_count;
+
+ if (!bfd_read_p (abfd) ||
+ ((int)(abfd->format) < (int)bfd_unknown) ||
+ ((int)(abfd->format) >= (int)bfd_type_end)) {
+ bfd_error = invalid_operation;
+ return false;
+ }
+
+ if (abfd->format != bfd_unknown)
+ return (abfd->format == format)? true: false;
+
+ /* presume the answer is yes */
+ abfd->format = format;
+
+ /* If the target type was explicitly specified, just check that target. */
+
+ if (!abfd->target_defaulted) {
+ bfd_seek (abfd, (file_ptr)0, SEEK_SET); /* rewind! */
+
+ right_targ = BFD_SEND_FMT (abfd, _bfd_check_format, (abfd));
+ if (right_targ) {
+ abfd->xvec = right_targ; /* Set the target as returned */
+ return true; /* File position has moved, BTW */
+ }
+ abfd->format = bfd_unknown;
+ return false; /* Specified target is not right */
+ }
+
+ /* Since the target type was defaulted, check them
+ all in the hope that one will be uniquely recognized. */
+
+ save_targ = abfd->xvec;
+ match_count = 0;
+ right_targ = 0;
+
+ for (target = target_vector; *target != NULL; target++) {
+ bfd_target *temp;
+
+ abfd->xvec = *target; /* Change BFD's target temporarily */
+ bfd_seek (abfd, (file_ptr)0, SEEK_SET);
+ temp = BFD_SEND_FMT (abfd, _bfd_check_format, (abfd));
+ if (temp) { /* This format checks out as ok! */
+ right_targ = temp;
+ match_count++;
+ /* If this is the default target, accept it, even if other targets
+ might match. People who want those other targets have to set
+ the GNUTARGET variable. */
+ if (temp == default_vector[0])
+ break;
+#ifdef GNU960
+ /* Big- and little-endian b.out archives look the same, but it doesn't
+ * matter: there is no difference in their headers, and member file byte
+ * orders will (I hope) be handled appropriately by bfd. Ditto for big
+ * and little coff archives. And the 4 coff/b.out object formats are
+ * unambiguous. So accept the first match we find.
+ */
+ break;
+#endif
+ }
+ }
+
+ if (match_count == 1) {
+ abfd->xvec = right_targ; /* Change BFD's target permanently */
+ return true; /* File position has moved, BTW */
+ }
+
+ abfd->xvec = save_targ; /* Restore original target type */
+ abfd->format = bfd_unknown; /* Restore original format */
+ bfd_error = ((match_count == 0) ? file_not_recognized :
+ file_ambiguously_recognized);
+ return false;
+}
+/*proto*
+*i bfd_set_format
+This function sets the file format of the supplied BFD to the format
+requested. If the target set in the BFD does not support the format
+requested, the format is illegal or the BFD is not open for writing
+than an error occurs.
+*; PROTO(boolean,bfd_set_format,(bfd *, bfd_format));
+*-*/
+boolean
+DEFUN(bfd_set_format,(abfd, format),
+ bfd *abfd AND
+ bfd_format format)
+{
+
+ if (bfd_read_p (abfd) ||
+ ((int)abfd->format < (int)bfd_unknown) ||
+ ((int)abfd->format >= (int)bfd_type_end)) {
+ bfd_error = invalid_operation;
+ return false;
+ }
+
+ if (abfd->format != bfd_unknown)
+ return (abfd->format == format) ? true:false;
+
+ /* presume the answer is yes */
+ abfd->format = format;
+
+ if (!BFD_SEND_FMT (abfd, _bfd_set_format, (abfd))) {
+ abfd->format = bfd_unknown;
+ return false;
+ }
+
+ return true;
+}
+
+
+/*proto*
+*i bfd_format_string
+This function takes one argument, and enumerated type (bfd_format) and
+returns a pointer to a const string "invalid", "object", "archive",
+"core" or "unknown" depending upon the value of the enumeration.
+*; PROTO(CONST char *, bfd_format_string, (bfd_format));
+*-*/
+
+CONST char *
+DEFUN(bfd_format_string,(format),
+ bfd_format format)
+{
+ if (((int)format <(int) bfd_unknown)
+ || ((int)format >=(int) bfd_type_end))
+ return "invalid";
+
+ switch (format) {
+ case bfd_object:
+ return "object"; /* linker/assember/compiler output */
+ case bfd_archive:
+ return "archive"; /* object archive file */
+ case bfd_core:
+ return "core"; /* core dump */
+ default:
+ return "unknown";
+ }
+}
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