The checksum varies depending on sizeof (int). */
/* SYSV: calculate and print the checksum and the size in 512-byte blocks */
/* Return 1 if successful. */
-static unsigned sum_file(const char *file, const unsigned type)
+static unsigned sum_file(const char *file, unsigned type)
{
#define buf bb_common_bufsiz1
unsigned long long total_bytes = 0;
- int fd = 0, r;
-
+ int fd, r;
/* The sum of all the input bytes, modulo (UINT_MAX + 1). */
unsigned s = 0;
- if (NOT_LONE_DASH(file)) {
- fd = open(file, O_RDONLY);
- if (fd == -1)
- goto ret_bad;
- }
+ fd = open_or_warn_stdin(file);
+ if (fd == -1)
+ return 0;
while (1) {
size_t bytes_read = safe_read(fd, buf, BUFSIZ);
if (!bytes_read && !r)
/* no error */
break;
- ret_bad:
bb_perror_msg(file);
return 0;
}
#undef buf
}
-int sum_main(int argc, char **argv);
-int sum_main(int argc, char **argv)
+int sum_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int sum_main(int argc UNUSED_PARAM, char **argv)
{
unsigned n;
unsigned type = SUM_BSD;
n = getopt32(argv, "sr");
+ argv += optind;
if (n & 1) type = SUM_SYSV;
/* give the bsd priority over sysv func */
if (n & 2) type = SUM_BSD;
- if (argc == optind) {
+ if (!argv[0]) {
/* Do not print the name */
n = sum_file("-", type);
} else {
/* Need to print the name if either
- more than one file given
- doing sysv */
- type += argc - 1 > optind || type == SUM_SYSV;
- for (n = 1; optind < argc; optind++)
- n &= sum_file(argv[optind], type);
+ type += (argv[1] || type == SUM_SYSV);
+ n = 1;
+ do {
+ n &= sum_file(*argv, type);
+ } while (*++argv);
}
return !n;
}