/* $NetBSD: nlist_coff.c,v 1.13 2026/01/09 14:15:46 skrll Exp $ */

/*
 * Copyright (c) 1996 Christopher G. Demetriou
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *          This product includes software developed for the
 *          NetBSD Project.  See http://www.NetBSD.org/ for
 *          information about NetBSD.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * 
 * <<Id: LICENSE,v 1.2 2000/06/14 15:57:33 cgd Exp>>
 */

#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: nlist_coff.c,v 1.13 2026/01/09 14:15:46 skrll Exp $");
#endif /* LIBC_SCCS and not lint */

#include "namespace.h"

#include <sys/param.h>
#include <sys/endian.h>
#include <sys/file.h>
#include <sys/mman.h>
#include <sys/stat.h>

#include <assert.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <nlist.h>

#include "nlist_private.h"
#ifdef NLIST_COFF
#include <sys/exec_coff.h>
#endif

#ifdef NLIST_COFF

#define ES_LEN 18
struct coff_extsym {
        union {
                char u_name[8];
                struct {
                        int u_zero;
                        int u_offset;
                } s;
        } u;
        int32_t es_value;
        int16_t es_scnum;
        int16_t es_type;
        int8_t es_class;
        int8_t es_numaux;
};
#define es_name u.u_name
#define es_zero u.s.u_zero
#define es_offset u.s.u_offset

int
__fdnlist_coff(int fd, struct nlist *list)
{
        struct nlist *p;
        struct coff_filehdr *filehdrp;
        struct stat st;
        char *mappedfile;
        size_t mappedsize;
        u_long symoff, extstroff;
        int rv, nent;
        long i, nesyms;

        _DIAGASSERT(fd != -1);
        _DIAGASSERT(list != NULL);

        rv = -1;

        /*
         * If we can't fstat() the file, something bad is going on.
         */
        if (fstat(fd, &st) < 0)
                goto out;

        /*
         * Map the file in its entirety.
         */
        if ((uintmax_t)st.st_size > (uintmax_t)SIZE_T_MAX) {
                errno = EFBIG;
                goto out;
        }
        mappedsize = (size_t)st.st_size;
        mappedfile = mmap(NULL, mappedsize, PROT_READ, MAP_PRIVATE|MAP_FILE,
            fd, 0);
        if (mappedfile == MAP_FAILED)
                goto out;

        /*
         * Make sure we can access the executable's header
         * directly, and make sure we recognize the executable
         * as an COFF binary.
         */
        if (mappedsize < sizeof (struct coff_filehdr))
                goto unmap;
        filehdrp = (void *)&mappedfile[0];

        if (COFF_BADMAG(filehdrp))
                goto unmap;

        /*
         * Find the symbol list.
         */
        symoff = filehdrp->f_symptr;
        nesyms = filehdrp->f_nsyms;

        if (symoff + ES_LEN * nesyms > mappedsize)
                goto unmap;
        extstroff = symoff + ES_LEN * nesyms;

        nent = 0;
        for (p = list; !ISLAST(p); ++p) {
                p->n_type = 0;
                p->n_other = 0;
                p->n_desc = 0;
                p->n_value = 0;
                ++nent;
        }

        for (i = 0; i < nesyms; i++) {
                char *symtabname;
                const char *nlistname;
                struct coff_extsym esym;
                char name[10];

                memcpy(&esym, &mappedfile[symoff + ES_LEN * i], ES_LEN);
                if (esym.es_numaux != 0) {
                        i += esym.es_numaux;    /* XXX Skip aux entry */
                        continue;
                }
                        
                if (esym.es_zero != 0) {
                        memcpy(name, esym.es_name, 8);
                        name[8] = 0;
                        symtabname = name;
                } else if (esym.es_offset != 0)
                        symtabname = &mappedfile[extstroff + esym.es_offset];
                else
                        continue;

                for (p = list; !ISLAST(p); p++) {
                        nlistname = N_NAME(p);
                        if (!strcmp(symtabname, nlistname)) {
                                /*
                                 * Translate (roughly) from COFF to nlist
                                 */
                                p->n_value = esym.es_value;
                                p->n_type = N_EXT;              /* XXX */
                                p->n_desc = 0;                  /* XXX */
                                p->n_other = 0;                 /* XXX */

                                if (--nent <= 0)
                                        goto done;
                                break;  /* into next run of outer loop */
                        }
                }
        }

done:
        rv = nent;
unmap:
        munmap(mappedfile, mappedsize);
out:
        return rv;
}

#endif /* NLIST_COFF */