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/* vi: set sw=4 ts=4:
*
* truncate.c - set file length, extending sparsely if necessary
*
* Copyright 2011 Rob Landley <rob@landley.net>
*
* Not in SUSv4
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
*/
#include "toys.h"
DEFINE_GLOBALS(
long size;
)
#define TT this.truncate
static void do_truncate(int fd, char *name)
{
if (fd<0) return;
if (ftruncate(fd, TT.size)) {
perror_msg("failed to set '%s' to '%ld'", name, TT.size);
toys.exitval = EXIT_FAILURE;
}
}
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);
}
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