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https://sourceforge.net/forum/message.php?msg_id=3131380
By: nobody
I'm not aware of a gnuwin32 tool that will fill a file with a particular byte
value, but here's one that will. I wrote it for the MSVC 6.0 environment; it
should port to other compiler environments with minimal work. The part that
might give trouble is the "setmode" call; you'll need this to prevent NL to
CRLF translation, and to avoid misinterpretation of CTRL-Z.
Enjoy,
Robert Bassett
/* bytegen: repeat a specified byte */
#include <stdio.h>
#include <fcntl.h>
unsigned interp (char *s)
{
if (*s == '\')
switch (*++s) {
case 'x': case 'X':
return (unsigned char) strtoul (++s, NULL, 16);
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
return (unsigned char) strtoul (s, NULL, 0);
case '\':
return '\';
case 'a':
return '\a';
case 'b':
return '\b';
case 'f':
return '\f';
case 'n':
return '\n';
case 'r':
return '\r';
case 't':
return '\t';
case 'v':
return '\v';
}
return (unsigned char) *s;
}
int main (int argc, char **argv)
{
unsigned byte, rept;
if ((argc > 1) && (!strcmp (argv[1], "-h") || !strcmp (argv[1],
"--help"))) {
printf ("%s: usage: %s [ char [ repeat ] ]\n", argv[0],
argv[0]);
printf ("\nchar may be one of the following:\n");
printf (" \xhh an hexadecimal escape code\n");
printf (" \ooo an octal escape code (beginning with 0)\n");
printf (" \ddd a decimal escape code (not beginning with
0)\n");
printf (" \\ backslash\n");
printf (" \a alert (BEL)\n");
printf (" \b backspace\n");
printf (" \f form feed\n");
printf (" \n newline\n");
printf (" \r carriage return\n");
printf (" \t tab\n");
printf (" \v vertical tab\n");
printf (" c a literal character (default is a)\n");
printf ("\nrepeat is a 32-bit unsigned number, from 0 to
4294967295,
inclusive.\n");
printf ("repeat may be specified in decimal, octal (with
leading 0), or 0x
hex.\n");
printf ("repeat defaults to 128, for no special reason.\n");
return 0;
}
if (argc < 2) {
byte = 'a';
rept = 128;
} else if (argc < 3) {
byte = interp (argv[1]);
rept = 128;
} else {
byte = interp (argv[1]);
rept = strtoul (argv[2], NULL, 0);
}
setmode (1, _O_BINARY);
while (rept--)
putchar (byte);
return 0;
}
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