kopia lustrzana https://github.com/Jean-MarcHarvengt/MCUME
96 wiersze
2.3 KiB
C
96 wiersze
2.3 KiB
C
/*************************************************************/
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/** **/
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/** diskwork.h **/
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/** **/
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/** Common definitions for programs working with **/
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/** disk-images that can be used with fMSX **/
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/** **/
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/** **/
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/** Copyright (c) Arnold Metselaar 1996 **/
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/** You are not allowed to distribute this software **/
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/** commercially. Please, notify me, if you make any **/
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/** changes to this file. **/
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/*************************************************************/
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#ifndef O_BINARY
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#define O_BINARY 0
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#endif
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#define usint unsigned short int
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#define byte unsigned char
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#define EOF_FAT 0xFFF /* signals EOF in FAT */
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typedef struct de {
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char d_fname[8];
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char d_ext[3];
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char d_attrib;
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char d_reserv[10]; /* unused */
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byte d_time[2]; /* byte-ordering of ints is machine-dependent */
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byte d_date[2];
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byte d_first[2];
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byte d_size[4];
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} DirEntry;
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/* macros to change DirEntries */
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#define setsh(x,y) {x[0]=y;x[1]=y>>8;}
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#define setlg(x,y) {x[0]=y;x[1]=y>>8;x[2]=y>>16;x[3]=y>>24;}
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/* macros to read DirEntries */
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#define rdsh(x) (x[0]+(x[1]<<8))
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#define rdlg(x) (x[0]+(x[1]<<8)+(x[2]<<16)+(x[3]<<24))
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#define PError(x) { fprintf(stderr,"%s: ",progname); perror(x); }
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#define seclen 512 /* length of sector */
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#define cluslen 1024 /* length of cluster */
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void *xalloc(size_t len)
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{
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void *p;
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if (!(p=malloc(len)))
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{
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puts("Out of memory\n"); exit(2);
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}
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return p;
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}
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extern byte *FAT;
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/* read FAT-entry from FAT in memory */
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usint ReadFAT(usint clnr)
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{ register byte *P;
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P=FAT+(clnr*3)/2;
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return (clnr&1)? (P[0]>>4)+(P[1]<<4) : P[0]+((P[1]&0x0F)<<8);
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}
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/* write an entry to FAT in memory */
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void WriteFAT(usint clnr, usint val)
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{ register byte *P;
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P=FAT+(clnr*3)/2;
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if (clnr&1)
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{
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P[0]=(P[0]&0x0F)+(val<<4);
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P[1]=val>>4;
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}
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else
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{
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P[0]=val;
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P[1]=(P[1]&0xF0)+((val>>8)&0x0F);
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}
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}
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