DOOM Companion (Alt)/DOOM Companion CD-ROM - iso/DOOM Companion CD-ROM.iso/other/doombsp/cmdlib.c

C/C++ Source or Header | 1994-04-06 | 7.8 KB | 60 lines

// cmdlib.c


#include "cmdlib.h"

#ifndef __NeXT__

#define PATHSEPERATOR   '\\'
#endif

#ifdef __NeXT__

#define O_BINARY        0
#define PATHSEPERATOR   '/'


/*
================
=
= filelength
=
================
*/
int filelength (int handle)
{
    struct stat    fileinfo;

    if (fstat (handle,&fileinfo) == -1)
    {
        fprintf (stderr,"Error fstating");
        exit (1);
    }
    return fileinfo.st_size;
}
int tell (int handle)
{
    return lseek (handle, 0, L_INCR);
}
char *strupr (char *start)
{
    char    *in;
    in = start;
    while (*in)
    {
        *in = toupper(*in);
        in++;
    }
    return start;
}
char *getcwd (char *path, int length)
{
    return getwd(path);
}
#endif


/* globals for command line args */
#ifdef __NeXT__
extern int NXArgc;
extern char **NXArgv;
#define myargc    NXArgc
#define myargv    NXArgv
#endif

#ifdef __WATCOMC__
extern int _argc;
extern char **_argv;
#define myargc    _argc
#define myargv    _argv
#endif


/*
=============================================================================

                        MISC FUNCTIONS

=============================================================================
*/

/*
=================
=
= Error
=
= For abnormal program terminations
=
=================
*/

void Error (char *error, ...)
{
    va_list argptr;

#ifndef __NeXT__
    if ( *(byte *)0x449 == 0x13)
        TextMode ();
#endif

    va_start (argptr,error);
    vprintf (error,argptr);
    va_end (argptr);
    printf ("\n");
    exit (1);
}


/*
=================
=
= CheckParm
=
= Checks for the given parameter in the program's command line arguments
=
= Returns the argument number (1 to argc-1) or 0 if not present
=
=================
*/

int CheckParm (char *check)
{
    int             i;
    char    *parm;

    for (i = 1;i<myargc;i++)
    {
        parm = myargv[i];

        if ( !isalpha(*parm) )  // skip - / \ etc.. in front of parm
            if (!*++parm)
                continue;               // parm was only one char

        if ( !stricmp(check,parm) )
            return i;
    }

    return 0;
}




int SafeOpenWrite (char *filename)
{
    int     handle;

    handle = open(filename,O_RDWR | O_BINARY | O_CREAT | O_TRUNC
    , 0666);

    if (handle == -1)
        Error ("Error opening %s: %s",filename,strerror(errno));

    return handle;
}

int SafeOpenRead (char *filename)
{
    int     handle;

    handle = open(filename,O_RDONLY | O_BINARY);

    if (handle == -1)
        Error ("Error opening %s: %s",filename,strerror(errno));

    return handle;
}


void SafeRead (int handle, void *buffer, long count)
{
    unsigned        iocount;

    while (count)
    {
        iocount = count > 0x8000 ? 0x8000 : count;
        if (read (handle,buffer,iocount) != iocount)
            Error ("File read failure");
        buffer = (void *)( (byte *)buffer + iocount );
        count -= iocount;
    }
}


void SafeWrite (int handle, void *buffer, long count)
{
    unsigned        iocount;

    while (count)
    {
        iocount = count > 0x8000 ? 0x8000 : count;
        if (write (handle,buffer,iocount) != iocount)
            Error ("File write failure");
        buffer = (void *)( (byte *)buffer + iocount );
        count -= iocount;
    }
}


void *SafeMalloc (long size)
{
    void *ptr;

    ptr = malloc (size);

    if (!ptr)
        Error ("Malloc failure for %lu bytes",size);

    return ptr;
}


/*
==============
=
= LoadFile
=
==============
*/

long    LoadFile (char *filename, void **bufferptr)
{
    int             handle;
    long    length;
    void    *buffer;

    handle = SafeOpenRead (filename);
    length = filelength (handle);
    buffer = SafeMalloc (length);
    SafeRead (handle, buffer, length);
    close (handle);

    *bufferptr = buffer;
    return length;
}


/*
==============
=
= SaveFile
=
==============
*/

void    SaveFile (char *filename, void *buffer, long count)
{
    int             handle;

    handle = SafeOpenWrite (filename);
    SafeWrite (handle, buffer, count);
    close (handle);
}



void DefaultExtension (char *path, char *extension)
{
    char    *src;
//
// if path doesn't have a .EXT, append extension
// (extension should include the .)
//
    src = path + strlen(path) - 1;

    while (*src != PATHSEPERATOR && src != path)
    {
        if (*src == '.')
            return;                 // it has an extension
        src--;
    }

    strcat (path, extension);
}


void DefaultPath (char *path, char *basepath)
{
    char    temp[128];

    if (path[0] == PATHSEPERATOR)
        return;                                                 // absolute path location
    strcpy (temp,path);
    strcpy (path,basepath);
    strcat (path,temp);
}


void    StripFilename (char *path)
{
    int             length;

    length = strlen(path)-1;
    while (length > 0 && path[length] != PATHSEPERATOR)
        length--;
    path[length] = 0;
}

void    StripExtension (char *path)
{
    int             length;

    length = strlen(path)-1;
    while (length > 0 && path[length] != '.')
        length--;
    if (length)
        path[length] = 0;
}


void ExtractFileBase (char *path, char *dest)
{
    char    *src;
    int             length;

    src = path + strlen(path) - 1;

//
// back up until a \ or the start
//
    while (src != path && *(src-1) != PATHSEPERATOR)
        src--;

//
// copy up to eight characters
//
    memset (dest,0,8);
    length = 0;
    while (*src && *src != '.')
    {
        if (++length == 9)
            Error ("Filename base of %s >8 chars",path);
        *dest++ = toupper(*src++);
    }
}


/*
==============
=
= ParseNum / ParseHex
=
==============
*/

long ParseHex (char *hex)
{
    char    *str;
    long    num;

    num = 0;
    str = hex;

    while (*str)
    {
        num <<= 4;
        if (*str >= '0' && *str <= '9')
            num += *str-'0';
        else if (*str >= 'a' && *str <= 'f')
            num += 10 + *str-'a';
        else if (*str >= 'A' && *str <= 'F')
            num += 10 + *str-'A';
        else
            Error ("Bad hex number: %s",hex);
        str++;
    }

    return num;
}


long ParseNum (char *str)
{
    if (str[0] == '$')
        return ParseHex (str+1);
    if (str[0] == '0' && str[1] == 'x')
        return ParseHex (str+2);
    return atol (str);
}


int GetKey (void)
{
#ifdef __NeXT__
    return getchar ();
#else
    return _bios_keybrd (_KEYBRD_READ)&0xff;
#endif
}

/*
============================================================================

                    BYTE ORDER FUNCTIONS

============================================================================
*/

#ifdef __BIG_ENDIAN__
short   LittleShort (short l)
{
    byte    b1,b2;

    b1 = l&255;
    b2 = (l>>8)&255;

    return (b1<<8) + b2;
}

short   BigShort (short l)
{
    return l;
}


long    LittleLong (long l)
{
    byte    b1,b2,b3,b4;

    b1 = l&255;
    b2 = (l>>8)&255;
    b3 = (l>>16)&255;
    b4 = (l>>24)&255;

    return ((long)b1<<24) + ((long)b2<<16) + ((long)b3<<8) + b4;
}

long    BigLong (long l)
{
    return l;
}


#else

short   BigShort (short l)
{
    byte    b1,b2;

    b1 = l&255;
    b2 = (l>>8)&255;

    return (b1<<8) + b2;
}

short   LittleShort (short l)
{
    return l;
}


long    BigLong (long l)
{
    byte    b1,b2,b3,b4;

    b1 = l&255;
    b2 = (l>>8)&255;
    b3 = (l>>16)&255;
    b4 = (l>>24)&255;

    return ((long)b1<<24) + ((long)b2<<16) + ((long)b3<<8) + b4;
}

long    LittleLong (long l)
{
    return l;
}


#endif
/*
============================================================================

                        BASIC GRAPHICS

============================================================================
*/

byte    *screen;
#define PEL_WRITE_ADR   0x3c8
#define PEL_READ_ADR    0x3c7
#define PEL_DATA                0x3c9
#define PEL_MASK                0x3c6

/*
==============
=
= GetPalette
=
= Return an 8 bit / color palette
=
==============
*/

void GetPalette (byte *pal)
{
#ifndef __NeXT__
    int     i;

    outp (PEL_READ_ADR,0);
    for (i=0 ; i<768 ; i++)
        pal[i] = inp (PEL_DATA)<<2;
#endif
}

/*
==============
=
= SetPalette
=
= Sets an 8 bit / color palette
=
==============
*/

void SetPalette (byte *pal)
{
#ifndef __NeXT__
    int     i;

    outp (PEL_WRITE_ADR,0);
    for (i=0 ; i<768 ; i++)
        outp (PEL_DATA, pal[i]>>2);
#endif
}


void VGAMode (void)
{
#ifndef __NeXT__
union REGS      regs;        // scratch for int calls
    regs.w.ax = 0x13;
    int386 (0x10,(const union REGS *)®s,®s);
    screen = (byte *)0xa0000;
#else
    screen = malloc (0x10000);
#endif

}

void TextMode (void)
{
#ifndef __NeXT__
union REGS      regs;        // scratch for int calls
    regs.w.ax = 0x3;
    int386 (0x10,(const union REGS *)®s,®s);
#endif
}