106 lines
2.4 KiB
C
Executable file
106 lines
2.4 KiB
C
Executable file
#include "sysincludes.h"
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#include "msdos.h"
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#include "stream.h"
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#include "mtools.h"
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#include "file.h"
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#include "fs.h"
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/* #define DEBUG */
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/*
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* Read a directory entry into caller supplied buffer
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*/
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struct directory *dir_read(direntry_t *entry, int *error)
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{
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int n;
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*error = 0;
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if((n=force_read(entry->Dir, (char *) (&entry->dir),
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(mt_off_t) entry->entry * MDIR_SIZE,
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MDIR_SIZE)) != MDIR_SIZE) {
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if (n < 0) {
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*error = -1;
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}
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return NULL;
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}
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return &entry->dir;
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}
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/*
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* Make a subdirectory grow in length. Only subdirectories (not root)
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* may grow. Returns a 0 on success, 1 on failure (disk full), or -1
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* on error.
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*/
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int dir_grow(Stream_t *Dir, int size)
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{
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Stream_t *Stream = GetFs(Dir);
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DeclareThis(FsPublic_t);
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int ret;
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int buflen;
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char *buffer;
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if (!getfreeMinClusters(Dir, 1))
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return -1;
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buflen = This->cluster_size * This->sector_size;
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if(! (buffer=malloc(buflen)) ){
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perror("dir_grow: malloc");
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return -1;
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}
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memset((char *) buffer, '\0', buflen);
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ret = force_write(Dir, buffer, (mt_off_t) size * MDIR_SIZE, buflen);
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free(buffer);
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if(ret < buflen)
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return -1;
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return 0;
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}
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void low_level_dir_write(direntry_t *entry)
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{
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force_write(entry->Dir,
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(char *) (&entry->dir),
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(mt_off_t) entry->entry * MDIR_SIZE, MDIR_SIZE);
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}
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/*
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* Make a directory entry. Builds a directory entry based on the
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* name, attribute, starting cluster number, and size. Returns a pointer
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* to a static directory structure.
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*/
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struct directory *mk_entry(const char *filename, char attr,
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unsigned int fat, size_t size, time_t date,
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struct directory *ndir)
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{
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struct tm *now;
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time_t date2 = date;
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unsigned char hour, min_hi, min_low, sec;
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unsigned char year, month_hi, month_low, day;
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now = localtime(&date2);
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strncpy(ndir->name, filename, 8);
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strncpy(ndir->ext, filename + 8, 3);
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ndir->attr = attr;
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ndir->ctime_ms = 0;
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hour = now->tm_hour << 3;
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min_hi = now->tm_min >> 3;
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min_low = now->tm_min << 5;
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sec = now->tm_sec / 2;
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ndir->ctime[1] = ndir->time[1] = hour + min_hi;
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ndir->ctime[0] = ndir->time[0] = min_low + sec;
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year = (now->tm_year - 80) << 1;
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month_hi = (now->tm_mon + 1) >> 3;
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month_low = (now->tm_mon + 1) << 5;
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day = now->tm_mday;
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ndir -> adate[1] = ndir->cdate[1] = ndir->date[1] = year + month_hi;
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ndir -> adate[0] = ndir->cdate[0] = ndir->date[0] = month_low + day;
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set_word(ndir->start, fat & 0xffff);
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set_word(ndir->startHi, fat >> 16);
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set_dword(ndir->size, size);
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return ndir;
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}
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