apptype.c

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/*
 * Adapted from: apptype.c, Written by Eberhard Mattes and put into the
 * file_public domain
 *
 * Notes: 1. Qualify the filename so that DosQueryAppType does not do extraneous
 * searches.
 *
 * 2. DosQueryAppType will return FAPPTYP_DOS on a file ending with ".com"
 * (other than an OS/2 exe or Win exe with this name). Eberhard Mattes
 * remarks Tue, 6 Apr 93: Moreover, it reports the type of the (new and very
 * bug ridden) Win Emacs as "OS/2 executable".
 *
 * 3. apptype() uses the filename if given, otherwise a tmp file is created with
 * the contents of buf. If buf is not the complete file, apptype can
 * incorrectly identify the exe type. The "-z" option of "file" is the reason
 * for this ugly code.
 */
 
/*
 * amai: Darrel Hankerson did the changes described here.
 *
 * It remains to check the validity of comments (2.) since it's referred to an
 * "old" OS/2 version.
 *
 */
 
#include "file.h"
 
#ifndef lint
FILE_RCSID("@(#)$File: apptype.c,v 1.17 2022/12/26 17:31:14 christos Exp $")
#endif /* lint */
 
#include <stdlib.h>
#include <string.h>
 
#ifdef __EMX__
#include <io.h>
#define INCL_DOSSESMGR
#define INCL_DOSERRORS
#define INCL_DOSFILEMGR
#include <os2.h>
typedef ULONG   APPTYPE;
 
file_protected int
file_os2_apptype(struct magic_set *ms, const char *fn, const void *buf,
    size_t nb)
{
    APPTYPE         rc, type;
    char            path[_MAX_PATH], drive[_MAX_DRIVE], dir[_MAX_DIR],
            fname[_MAX_FNAME], ext[_MAX_EXT];
    char           *filename;
    FILE           *fp;
 
    if (fn)
        filename = strdup(fn);
    else if ((filename = tempnam("./", "tmp")) == NULL) {
        file_error(ms, errno, "cannot create tempnam");
        return -1;
    }
    /* qualify the filename to prevent extraneous searches */
    _splitpath(filename, drive, dir, fname, ext);
    (void)sprintf(path, "%s%s%s%s", drive,
        (*dir == '\0') ? "./" : dir,
        fname,
        (*ext == '\0') ? "." : ext);
 
    if (fn == NULL) {
        if ((fp = fopen(path, "wb")) == NULL) {
            file_error(ms, errno, "cannot open tmp file `%s'", path);
            return -1;
        }
        if (fwrite(buf, 1, nb, fp) != nb) {
            file_error(ms, errno, "cannot write tmp file `%s'",
                path);
            (void)fclose(fp);
            return -1;
        }
        (void)fclose(fp);
    }
    rc = DosQueryAppType((unsigned char *)path, &type);
 
    if (fn == NULL) {
        unlink(path);
        free(filename);
    }
#if 0
    if (rc == ERROR_INVALID_EXE_SIGNATURE)
        printf("%s: not an executable file\n", fname);
    else if (rc == ERROR_FILE_NOT_FOUND)
        printf("%s: not found\n", fname);
    else if (rc == ERROR_ACCESS_DENIED)
        printf("%s: access denied\n", fname);
    else if (rc != 0)
        printf("%s: error code = %lu\n", fname, rc);
    else
#else
 
    /*
     * for our purpose here it's sufficient to just ignore the error and
     * return w/o success (=0)
     */
 
    if (rc)
        return (0);
 
#endif
 
    if (type & FAPPTYP_32BIT)
        if (file_printf(ms, "32-bit ") == -1)
            return -1;
    if (type & FAPPTYP_PHYSDRV) {
        if (file_printf(ms, "physical device driver") == -1)
            return -1;
    } else if (type & FAPPTYP_VIRTDRV) {
        if (file_printf(ms, "virtual device driver") == -1)
            return -1;
    } else if (type & FAPPTYP_DLL) {
        if (type & FAPPTYP_PROTDLL)
            if (file_printf(ms, "file_protected ") == -1)
                return -1;
        if (file_printf(ms, "DLL") == -1)
            return -1;
    } else if (type & (FAPPTYP_WINDOWSREAL | FAPPTYP_WINDOWSPROT)) {
        if (file_printf(ms, "Windows executable") == -1)
            return -1;
    } else if (type & FAPPTYP_DOS) {
        /*
         * The API routine is partially broken on filenames ending
         * ".com".
         */
        if (stricmp(ext, ".com") == 0)
            if (strncmp((const char *)buf, "MZ", 2))
                return (0);
        if (file_printf(ms, "DOS executable") == -1)
            return -1;
        /* ---------------------------------------- */
        /* Might learn more from the magic(4) entry */
        if (file_printf(ms, ", magic(4)-> ") == -1)
            return -1;
        return (0);
        /* ---------------------------------------- */
    } else if (type & FAPPTYP_BOUND) {
        if (file_printf(ms, "bound executable") == -1)
            return -1;
    } else if ((type & 7) == FAPPTYP_WINDOWAPI) {
        if (file_printf(ms, "PM executable") == -1)
            return -1;
    } else if (file_printf(ms, "OS/2 executable") == -1)
        return -1;
 
    switch (type & (FAPPTYP_NOTWINDOWCOMPAT |
            FAPPTYP_WINDOWCOMPAT |
            FAPPTYP_WINDOWAPI)) {
    case FAPPTYP_NOTWINDOWCOMPAT:
        if (file_printf(ms, " [NOTWINDOWCOMPAT]") == -1)
            return -1;
        break;
    case FAPPTYP_WINDOWCOMPAT:
        if (file_printf(ms, " [WINDOWCOMPAT]") == -1)
            return -1;
        break;
    case FAPPTYP_WINDOWAPI:
        if (file_printf(ms, " [WINDOWAPI]") == -1)
            return -1;
        break;
    }
    return 1;
}
#endif