Quake 'em/QUAKEEM.BIN/quake/programs/mhfsv22/cmdlib.c

C/C++ Source or Header | 1996-07-24 | 8.7 KB | 599 lines

// cmdlib.c

#include "cmdlib.h"
#include <sys/time.h>

#define PATHSEPERATOR   '/'

// set these before calling CheckParm
int myargc;
char **myargv;

char    com_token[1024];
int        com_eof;

/*
================
I_FloatTime
================
*/
double I_FloatTime (void)
{
    struct timeval tp;
    struct timezone tzp;
    static int        secbase;

    gettimeofday(&tp, &tzp);

    if (!secbase)
    {
        secbase = tp.tv_sec;
        return tp.tv_usec/1000000.0;
    }

    return (tp.tv_sec - secbase) + tp.tv_usec/1000000.0;
}


/*
==============
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)
    {
        Error ("Error fstating");
    }

    return fileinfo.st_size;
}

int tell (int handle)
{
    return lseek (handle, 0, SEEK_CUR);
}

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;
}


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

                        MISC FUNCTIONS

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

/*
=================
Error

For abnormal program terminations
=================
*/
void Error (char *error, ...)
{
    va_list argptr;

    printf ("\n************ ERROR ************\n");

    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 ( !strcasecmp(check, myargv[i]) )
            return i;
    }

    return 0;
}


#ifndef O_BINARY
#define O_BINARY 0
#endif

int SafeOpenWrite (char *filename)
{
    int     handle;

    umask (0);

    handle = open(filename,O_WRONLY | O_CREAT | O_TRUNC | O_BINARY
    , 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)
{
    if (read (handle,buffer,count) != count)
        Error ("File read failure");
}


void SafeWrite (int handle, void *buffer, long count)
{
    if (write (handle,buffer,count) != count)
        Error ("File write failure");
}


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+1);
    ((byte *)buffer)[length] = 0;
    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 (path[length] == '/')
            return;        // no extension
    }
    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
==============
*/
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);
}



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

                    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;
}


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;
}


#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;
}

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