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Audit cksum(1)

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1) Reorder local variables.
2) Cleanup error messages, use %zu for size_t.
3) combine putchar(' ') and fputs to substitute printf(" %s", s).
4) Fix usage().
5) argv-argc-usage-fix.
6) Add empty line before return.
This commit is contained in:
FRIGN 2015-03-11 00:13:48 +01:00
parent 3c33abc520
commit d6818a3c5f
2 changed files with 19 additions and 17 deletions
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2
README
View File

@ -16,7 +16,7 @@ The following tools are implemented ('*' == finished, '#' == UTF-8 support,
=*| chmod yes none
=*| chown yes none
=*| chroot non-posix none
=* cksum yes none
=*| cksum yes none
=* cmp yes none
#*| cols non-posix none
col yes none

34
cksum.c
View File

@ -61,32 +61,33 @@ static const unsigned long crctab[] = { 0x00000000,
static void
cksum(FILE *fp, const char *s)
{
unsigned char buf[BUFSIZ];
size_t len = 0, i, n;
uint32_t ck = 0;
size_t len = 0;
size_t i, n;
unsigned char buf[BUFSIZ];
while ((n = fread(buf, 1, sizeof(buf), fp)) > 0) {
while ((n = fread(buf, 1, sizeof(buf), fp))) {
for (i = 0; i < n; i++)
ck = (ck << 8) ^ crctab[(ck >> 24) ^ buf[i]];
len += n;
}
if (ferror(fp))
eprintf("%s: read error:", s ? s : "<stdin>");
eprintf("fread %s:", s ? s : "<stdin>");
for (i = len; i > 0; i >>= 8)
for (i = len; i; i >>= 8)
ck = (ck << 8) ^ crctab[(ck >> 24) ^ (i & 0xFF)];
printf("%"PRIu32" %lu", ~ck, (unsigned long)len);
if (s)
printf(" %s", s);
printf("%"PRIu32" %zu", ~ck, len);
if (s) {
putchar(' ');
fputs(s, stdout);
}
putchar('\n');
}
static void
usage(void)
{
eprintf("usage: %s [files ...]\n", argv0);
eprintf("usage: %s [file ...]\n", argv0);
}
int
@ -99,17 +100,18 @@ main(int argc, char *argv[])
usage();
} ARGEND;
if (argc == 0)
if (!argc) {
cksum(stdin, NULL);
else {
for (; argc > 0; argc--, argv++) {
if (!(fp = fopen(argv[0], "r"))) {
weprintf("fopen %s:", argv[0]);
} else {
for (; *argv; argc--, argv++) {
if (!(fp = fopen(*argv, "r"))) {
weprintf("fopen %s:", *argv);
continue;
}
cksum(fp, argv[0]);
cksum(fp, *argv);
fclose(fp);
}
}
return 0;
}