busybox/coreutils/sum.c
Bernhard Reutner-Fischer 73561cc75a - pull from busybox_scratch: r15829:15850
Various fixes, cleanups and shrinkage:
saves 952 Bytes:
   text    data     bss     dec     hex filename
1087742   15853  790632 1894227  1ce753 ../busybox/busybox.old
1086790   15853  790632 1893275  1ce39b busybox
via:
# scripts/bloat-o-meter ../busybox/busybox_unstripped.old busybox_unstripped 
function                                             old     new   delta
ipcrm_main                                           756     822     +66
getval                                                 -      61     +61
maybe_set_utc                                          -      40     +40
udhcpc_main                                         2896    2912     +16
md5_hash_block                                       428     437      +9
opt                                                    8      16      +8
qgravechar                                           106     110      +4
make_bitmap                                          292     295      +3
inflate_unzip                                       2056    2059      +3
add_partition                                       1412    1414      +2
__parsespent                                         156     158      +2
qrealloc                                              41      42      +1
format                                                 -       1      +1
catv_main                                            313     314      +1
watch_main                                           293     292      -1
varunset                                              81      80      -1
part                                                   1       -      -1
check_if_skip                                        837     836      -1
start_stop_daemon_main                               840     837      -3
create_lost_and_found                                175     172      -3
supress_non_delimited_lines                            4       -      -4
static.l                                               4       -      -4
static.c                                               5       1      -4
bsd_sum_file                                         237     233      -4
eval2                                                338     332      -6
arithmetic_common                                    166     158      -8
cmpfunc                                               22       5     -17
cksum_main                                           294     275     -19
cmp_main                                             465     439     -26
dd_main                                             1535    1508     -27
rmmod_main                                           376     333     -43
cut_file                                             727     644     -83
ipcs_main                                           3809    3721     -88
cut_main                                             722     614    -108
date_main                                           1443    1263    -180
remove_ids                                           222       -    -222
------------------------------------------------------------------------------
(add/remove: 3/4 grow/shrink: 11/18 up/down: 217/-853)       Total: -636 bytes
2006-08-28 23:31:54 +00:00

157 lines
3.7 KiB
C

/* vi: set sw=4 ts=4: */
/*
* sum -- checksum and count the blocks in a file
* Like BSD sum or SysV sum -r, except like SysV sum if -s option is given.
*
* Copyright (C) 86, 89, 91, 1995-2002, 2004 Free Software Foundation, Inc.
* Copyright (C) 2005 by Erik Andersen <andersen@codepoet.org>
* Copyright (C) 2005 by Mike Frysinger <vapier@gentoo.org>
*
* Written by Kayvan Aghaiepour and David MacKenzie
* Taken from coreutils and turned into a busybox applet by Mike Frysinger
*
* Licensed under the GPL v2, see the file LICENSE in this tarball.
*/
#include "busybox.h"
/* 1 if any of the files read were the standard input */
static int have_read_stdin;
/* make a little more readable and avoid using strcmp for just 2 bytes */
#define IS_STDIN(s) (s[0] == '-' && s[1] == '\0')
/* Calculate and print the rotated checksum and the size in 1K blocks
of file FILE, or of the standard input if FILE is "-".
If PRINT_NAME is >1, print FILE next to the checksum and size.
The checksum varies depending on sizeof (int).
Return 1 if successful. */
static int bsd_sum_file(const char *file, int print_name)
{
FILE *fp;
int checksum = 0; /* The checksum mod 2^16. */
uintmax_t total_bytes = 0; /* The number of bytes. */
int ch; /* Each character read. */
int ret = 0;
if (IS_STDIN(file)) {
fp = stdin;
have_read_stdin++;
} else {
fp = bb_wfopen(file, "r");
if (fp == NULL)
goto out;
}
while ((ch = getc(fp)) != EOF) {
++total_bytes;
checksum = (checksum >> 1) + ((checksum & 1) << 15);
checksum += ch;
checksum &= 0xffff; /* Keep it within bounds. */
}
if (ferror(fp)) {
bb_perror_msg(file);
bb_fclose_nonstdin(fp);
goto out;
}
if (bb_fclose_nonstdin(fp) == EOF) {
bb_perror_msg(file);
goto out;
}
ret++;
printf("%05d %5ju ", checksum, (total_bytes+1023)/1024);
if (print_name > 1)
puts(file);
else
printf("\n");
out:
return ret;
}
/* Calculate and print the checksum and the size in 512-byte blocks
of file FILE, or of the standard input if FILE is "-".
If PRINT_NAME is >0, print FILE next to the checksum and size.
Return 1 if successful. */
#define MY_BUF_SIZE 8192
static int sysv_sum_file(const char *file, int print_name)
{
RESERVE_CONFIG_BUFFER(buf, MY_BUF_SIZE);
int fd;
uintmax_t total_bytes = 0;
/* The sum of all the input bytes, modulo (UINT_MAX + 1). */
unsigned int s = 0;
if (IS_STDIN(file)) {
fd = 0;
have_read_stdin = 1;
} else {
fd = open(file, O_RDONLY);
if (fd == -1)
goto release_and_ret;
}
while (1) {
size_t bytes_read = safe_read(fd, buf, MY_BUF_SIZE);
if (bytes_read == 0)
break;
if (bytes_read == -1) {
release_and_ret:
bb_perror_msg(file);
RELEASE_CONFIG_BUFFER(buf);
if (!IS_STDIN(file))
close(fd);
return 0;
}
total_bytes += bytes_read;
while (bytes_read--)
s += buf[bytes_read];
}
if (!IS_STDIN(file) && close(fd) == -1)
goto release_and_ret;
else
RELEASE_CONFIG_BUFFER(buf);
{
int r = (s & 0xffff) + ((s & 0xffffffff) >> 16);
s = (r & 0xffff) + (r >> 16);
printf("%d %ju ", s, (total_bytes+511)/512);
}
puts(print_name ? file : "");
return 1;
}
int sum_main(int argc, char **argv)
{
int flags;
int ok;
int (*sum_func)(const char *, int) = bsd_sum_file;
/* give the bsd func priority over sysv func */
flags = bb_getopt_ulflags(argc, argv, "sr");
if (flags & 1)
sum_func = sysv_sum_file;
if (flags & 2)
sum_func = bsd_sum_file;
have_read_stdin = 0;
if ((argc - optind) == 0)
ok = sum_func("-", 0);
else
for (ok = 1; optind < argc; optind++)
ok &= sum_func(argv[optind], 1);
if (have_read_stdin && fclose(stdin) == EOF)
bb_perror_msg_and_die("-");
exit(ok ? EXIT_SUCCESS : EXIT_FAILURE);
}