Superpower (Alt)/SUPERPOWER.iso/q/util/mbq319/cmdlib.c

C/C++ Source or Header | 1996-07-28 | 9.2 KB | 640 lines

// cmdlib.c

#define __LITTLE_ENDIAN__

#include "cmdlib.h"
#include "sys\stat.h"
#include <fcntl.h>

#define PATHSEPERATOR   '/'

char    com_token[1024];
int        com_eof;

/*
==============
COM_Parse

Parse a token out of a string
==============
*/
char *COM_Parse (char *data)
{
    int        c;
    int        len;

    len = 0;
    com_token[0] = 0;

    if (!data)
        return NULL;

// skip whitespace
skipwhite:
    while ( (c = *data) <= ' ')
    {
        if (c == 0)
        {
            com_eof = true;
            return NULL;            // end of file;
        }
        data++;
    }

// skip // comments
    if (c=='/' && data[1] == '/')
    {
        while (*data && *data != '\n')
            data++;
        goto skipwhite;
    }


// handle quoted strings specially
    if (c == '\"')
    {
        data++;
        do
        {
            c = *data++;
            if (c=='\"')
            {
                com_token[len] = 0;
                return data;
            }
            com_token[len] = c;
            len++;
        } while (1);
    }

// parse single characters
    if (c=='{' || c=='}'|| c==')'|| c=='(' || c=='\'' || c==':')
    {
        com_token[len] = c;
        len++;
        com_token[len] = 0;
        return data+1;
    }

// parse a regular word
    do
    {
        com_token[len] = c;
        data++;
        len++;
        c = *data;
    if (c=='{' || c=='}'|| c==')'|| c=='(' || c=='\'' || c==':')
            break;
    } while (c>32);

    com_token[len] = 0;
    return data;
}


/*
================
=
= 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, 0);
}

char *strupr (char *start)
{
    char    *in;
    in = start;
    while (*in)
    {
        *in = toupper(*in);
        in++;
    }
    return start;
}

char *strlower (char *start)
{
    char    *in;
    in = start;
    while (*in)
    {
        *in = tolower(*in);
        in++;
    }
    return start;
}

#ifdef NeXT
char *getcwd (char *path, int length)
{
    return getwd(path);
}
#endif

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

#ifndef NeXT
int NXArgc;
char **NXArgv;
#endif


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

                        MISC FUNCTIONS

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

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

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

    printf ("\n\nError: ");
    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;

    for (i = 1;i<myargc;i++)
    {
        if ( !stricmp(check, myargv[i]) )
            return i;
    }

    return 0;
}




int SafeOpenWrite (char *filename)
{
    int     handle;

    umask (0);

    handle = open(filename,O_RDWR | 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);

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

    return handle;
}


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

    iocount = read (handle,buffer,count);
    if (iocount != count)
        Error ("File read failure");
}


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

    iocount = write (handle,buffer,count);
    if (iocount != count)
        Error ("File write failure");
}


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

    ptr = malloc (size);

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

    return ptr;
}


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

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

    handle = SafeOpenRead (filename);
    length = filelength (handle);
    buffer = SafeMalloc (length+1);
    SafeRead (handle, buffer, length);
    close (handle);
    ((byte *)buffer)[length] = 0;

    *bufferptr = buffer;
    return length;
}


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

void    SaveFile (char *filename, void *buffer, int 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;

// FIXME: this fucks up on a file like ../gfz/aztec
    length = strlen(path)-1;
    while (length > 0 && path[length] != '.')
        length--;
    if (length)
        path[length] = 0;
}


/*
====================
=
= Extract file parts
=
====================
*/

void ExtractFilePath (char *path, char *dest)
{
    char    *src;

    src = path + strlen(path) - 1;

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

    memcpy (dest, path, src-path);
    dest[src-path] = 0;
}

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

    src = path + strlen(path) - 1;

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

    while (*src && *src != '.')
    {
        *dest++ = *src++;
    }
    *dest = 0;
}

void ExtractFileExtension (char *path, char *dest)
{
    char    *src;

    src = path + strlen(path) - 1;

//
// back up until a . or the start
//
    while (src != path && *(src-1) != '.')
        src--;
    if (src == path)
    {
        *dest = 0;    // no extension
        return;
    }

    strcpy (dest,src);
}


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

int ParseHex (char *hex)
{
    char    *str;
    int    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;
}


int 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)
{
    return getchar ();
}


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

                    BYTE ORDER FUNCTIONS

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

#ifdef __alpha
#define __LITTLE_ENDIAN__
#endif


#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;
}


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

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

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

int    BigLong (int l)
{
    printf("HEY!!  THIS SHOULDN'T BE CALLED!!!\n");
    return l;
}


float    LittleFloat (float l)
{
    union {byte b[4]; float f;} in, out;

    in.f = l;
    out.b[0] = in.b[3];
    out.b[1] = in.b[2];
    out.b[2] = in.b[1];
    out.b[3] = in.b[0];

    return out.f;
}

float    BigFloat (float l)
{
    return l;
}

#endif

#ifdef __LITTLE_ENDIAN__

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

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

    return (b1<<8) + b2;
}

short   LittleShort (short l)
{
    return l;
}

unsigned long BigLong(unsigned long val) {return ((val & 0x000000FF) << 24) | ((val & 0xFF00) << 8) | ((val & 0x00FF0000) >> 8) | (val >> 24);}

/* long BigLong(long a) {
    long f, g, r;

    printf("---> BigLong() was called with a value of: %lu\n", a);
    f = a >> 16;
    g = a & 0x0000FFFF;
    r = (g << 16) + f;
    printf("---> BigLong() returned: %lu\n", r);
    return r;
} */

/*
long    BigLong (int l)
{
    byte    b1,b2,b3,b4;
    long duh;

    b1 = l&255;
    b2 = (l>>8)&255;
    b3 = (l>>16)&255;
    b4 = (l>>24)&255;
    duh = (long) (((int)b1<<24) + ((int)b2<<16) + ((int)b3<<8) + b4);
    return duh;
}
*/

int    LittleLong (int l)
{
    return l;
}

float    BigFloat (float l)
{
    union {byte b[4]; float f;} in, out;

    in.f = l;
    out.b[0] = in.b[3];
    out.b[1] = in.b[2];
    out.b[2] = in.b[1];
    out.b[3] = in.b[0];

    return out.f;
}

float    LittleFloat (float l)
{
    return l;
}



#endif