blob: 123ae553e1c004b129cb643770316bbc5967c7cc (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
|
/* truncate.c - set file length, extending sparsely if necessary
*
* Copyright 2011 Rob Landley <rob@landley.net>
USE_TRUNCATE(NEWTOY(truncate, "<1s#|c", TOYFLAG_BIN))
config TRUNCATE
bool "truncate"
default y
help
usage: truncate [-c] -s file...
Set length of file(s), extending sparsely if necessary.
-c Don't create file if it doesn't exist.
-s New size
*/
#define FOR_truncate
#include "toys.h"
GLOBALS(
long size;
)
static void do_truncate(int fd, char *name)
{
if (fd<0) return;
if (ftruncate(fd, TT.size)) perror_msg("'%s' to '%ld'", name, TT.size);
}
void truncate_main(void)
{
int cr = !(toys.optflags&1);
// Create files with mask rwrwrw.
// Nonexistent files are only an error if we're supposed to create them.
loopfiles_rw(toys.optargs, O_WRONLY|(cr ? O_CREAT : 0), 0666, cr,
do_truncate);
}
|
