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/*
* Copyright (c) 1999-2016 Apple Inc. All rights reserved.
*
* @APPLE_LICENSE_HEADER_START@
*
* "Portions Copyright (c) 1999 Apple Computer, Inc. All Rights
* Reserved. This file contains Original Code and/or Modifications of
* Original Code as defined in and that are subject to the Apple Public
* Source License Version 1.0 (the 'License'). You may not use this file
* except in compliance with the License. Please obtain a copy of the
* License at http://www.apple.com/publicsource and read it before using
* this file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
* License for the specific language governing rights and limitations
* under the License."
*
* @APPLE_LICENSE_HEADER_END@
*/
/*
* Copyright (c) 1997 Apple Computer, Inc. All Rights Reserved
*
* HISTORY
* 29-Aug-97 Daniel Wade (danielw) at Apple
* Created.
*
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <ctype.h>
#include <err.h>
#define BF_SZ 512 /* Size of write chunks */
extern void usage(char *, char *);
extern void create_file(char *, quad_t, int, int);
extern void err_rm(char *, char *);
int
main(int argc, char **argv)
{
char *b_num, *prog_name;
char *options = "nv";
char c;
off_t multiplier = 1;
off_t file_size;
size_t len;
int empty = 0;
int verbose = 0;
char* endptr = NULL;
prog_name = argv[0]; /* Get program name */
if (1 == argc)
usage(prog_name, options);
/* Get options */
opterr=1;
while ((c=getopt(argc, argv, options)) != EOF)
switch (c) {
case 'v': /* Turn on verbose setting */
verbose = 1;
break;
case 'n': /* Create an empty file */
empty = 1;
break;
default:
usage(prog_name, options);
break;
}
/* Stop getting options
*/
argv += optind;
if (*argv == NULL) /* Is there a size given? */
usage(prog_name, options);
b_num = *argv++; /* Size of file and byte multiplier */
len = strlen(b_num) - 1;
if (!isdigit(b_num[len])) {
switch(b_num[len]) { /* Figure out multiplier */
case 'B':
case 'b':
multiplier = 512;
break;
case 'K':
case 'k':
multiplier = 1024;
break;
case 'M':
case 'm':
multiplier = 1024 * 1024;
break;
case 'G':
case 'g':
multiplier = 1024 * 1024 * 1024;
break;
default:
usage(prog_name, options);
}
}
if (*argv == NULL) /* Was a file name given? */
usage(prog_name, options);
if ((file_size = strtoll(b_num, &endptr, 10)) == 0 &&
(*endptr != 0 && endptr != &b_num[len])) {
err(1, "Bad file size!");
}
while ( *argv != NULL ) { /* Create file for each file_name */
create_file(*argv, file_size*multiplier, empty, verbose);
argv++;
}
return (0);
}
/* Create a file and make it empty (lseek) or zero'd */
void
create_file(char *file_name, quad_t size, int empty, int verbose)
{
char buff[BF_SZ];
int fd;
ssize_t bytes_written = BF_SZ;
quad_t i;
mode_t mode = S_IRUSR | S_IWUSR;
/* If superuser, then set sticky bit */
if (!geteuid()) mode |= S_ISVTX;
if ((fd = open(file_name, O_RDWR | O_CREAT | O_TRUNC, mode)) == -1)
err(1, NULL);
if (empty) { /* Create an empty file */
lseek(fd, (off_t)size-1, SEEK_SET);
if ( 1 != write(fd, "\0", 1))
err_rm(file_name, "Write Error");
}
else {
bzero(buff, BF_SZ);
/*
* First loop: write BF_SZ chunks until you have
* less then BF_SZ bytes to write.
* Second loop: write the remaining bytes.
* ERRORS in the write process will cause the
* file to be removed before the error is
* reported.
*/
for (i = size; i > BF_SZ; i -= bytes_written) {
bytes_written = write (fd, buff, BF_SZ);
if ( bytes_written == -1 )
err_rm (file_name, "Write Error");
}
for (; i > 0; i -= bytes_written) {
bytes_written = write (fd, buff, (size_t)i);
if ( bytes_written == -1 )
err_rm (file_name, "Write Error");
}
}
if (fchmod(fd, mode)) /* Change permissions */
err_rm(file_name, NULL);
if ((close(fd)) == -1)
err_rm(file_name, NULL);
if (verbose)
(void)fprintf(stderr, "%s %qd bytes\n", file_name, size);
}
/* On error remove the file */
void
err_rm(char *filename, char *msg)
{
unlink(filename);
err(1, "(%s removed) %s", filename, msg);
}
/* Print usage string */
void
usage(char *prog_name, char *options)
{
(void)fprintf(stderr,
"usage: %s [-%s] size[b|k|m|g] filename ...\n", prog_name, options);
exit(1);
}
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