diff options
Diffstat (limited to 'usr.bin/cksum/sum1.c')
| -rw-r--r-- | usr.bin/cksum/sum1.c | 22 |
1 files changed, 12 insertions, 10 deletions
diff --git a/usr.bin/cksum/sum1.c b/usr.bin/cksum/sum1.c index bcdeb30..aaba1e8 100644 --- a/usr.bin/cksum/sum1.c +++ b/usr.bin/cksum/sum1.c @@ -42,32 +42,34 @@ static const char rcsid[] = #include <sys/types.h> #include <unistd.h> +#include "extern.h" + int csum1(fd, cval, clen) - register int fd; + int fd; u_int32_t *cval, *clen; { - register u_int32_t total; - register int nr; - register u_int crc; - register u_char *p; + u_int32_t total; + int nr; + u_int lcrc; + u_char *p; u_char buf[8192]; /* * 16-bit checksum, rotating right before each addition; * overflow is discarded. */ - crc = total = 0; + lcrc = total = 0; while ((nr = read(fd, buf, sizeof(buf))) > 0) for (total += nr, p = buf; nr--; ++p) { - if (crc & 1) - crc |= 0x10000; - crc = ((crc >> 1) + *p) & 0xffff; + if (lcrc & 1) + lcrc |= 0x10000; + lcrc = ((lcrc >> 1) + *p) & 0xffff; } if (nr < 0) return(1); - *cval = crc; + *cval = lcrc; *clen = total; return(0); } |
