Created
October 15, 2015 22:51
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Program to fill empty hard disk space with zeros, for MS-DOS (Similiar to SysInternal's SDelete for Windows)
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/* | |
* Copyright (C) 2010 Shao Miller <shao.miller@yrdsb.edu.on.ca> | |
* Licensed under the GNU General Pulic License version 2 or later. | |
*/ | |
#include <stdio.h> | |
#include <malloc.h> | |
int main(int argc, char *argv[]) | |
{ | |
FILE *f; | |
int buf_size, i, written; | |
char *m; | |
if (argc < 2) { | |
puts("FILL.COM (C) 2010 Shao Miller <shao.miller@yrdsb.edu.on.ca>\n" | |
"Licensed under the GNU General Public License ver. 2 or later.\n" | |
"\n" | |
"Usage: fill.com <0|1>\n" | |
" 0: Write 1 byte at a time\n" | |
" 1: Write 512 bytes at a time"); | |
return -1; | |
} | |
switch (*argv[1]) { | |
case '0': | |
buf_size = 1; | |
break; | |
case '1': | |
buf_size = 512; | |
break; | |
default: | |
puts("Invalid argument. Use '0' (1 byte) or '1' (512 bytes)"); | |
return -2; | |
} | |
m = malloc(buf_size); | |
if (!m) { | |
puts("Couldn't allocate a buffer"); | |
return -3; | |
} | |
f = fopen("filler", "a+b"); | |
if (!f) { | |
puts("Couldn't open file for writing."); | |
free(m); | |
return -4; | |
} | |
i = buf_size; | |
while (i--) | |
m[i] = ~0; | |
written = buf_size; | |
while (written) | |
ritten = fwrite(m, buf_size, 1, f); | |
fclose(f); | |
free(m); | |
return 0; | |
} |
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Will compile using /tiny in Microsoft Quick C 2.5