crc32: code shrink for !CKSUM config

function                                             old     new   delta
cksum_main                                           215     203     -12

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 17 insertions, 11 deletions

diff --git a/coreutils/cksum.c b/coreutils/cksum.c
index 6b601b752..83b7e3238 100644
--- a/coreutils/cksum.c
+++ b/coreutils/cksum.c
@@ -51,7 +51,7 @@ int cksum_main(int argc UNUSED_PARAM, char **argv)
         setup_common_bufsiz();
         do {
                 uint32_t crc;
-                off_t filesize;
+                IF_CKSUM(off_t filesize;)
                 const char *fname = *argv ? *argv : bb_msg_standard_input;
                 int fd = open_or_warn_stdin(fname);
 
@@ -61,37 +61,43 @@ int cksum_main(int argc UNUSED_PARAM, char **argv)
                 }
 
                 crc = IS_CKSUM ? 0 : 0xffffffff;
-                filesize = 0;
+                IF_CKSUM(filesize = 0;)
 #define read_buf bb_common_bufsiz1
                 for (;;) {
                         int bytes_read = safe_read(fd, read_buf, COMMON_BUFSIZE);
                         if (bytes_read < 0)
                                 bb_simple_perror_msg_and_die(fname);
                         if (bytes_read > 0) {
-                                filesize += bytes_read;
+                                IF_CKSUM(filesize += bytes_read;)
                         } else {
+                                IF_CKSUM(uoff_t t;)
+
                                 close(fd);
+                                if (IS_CRC32)
+                                        break;
+#if ENABLE_CKSUM
                                 fd = -1; /* break flag */
                                 /* Checksum filesize bytes, LSB first */
-                                if (IS_CKSUM) {
-                                        uoff_t t = filesize;
-                                        bytes_read = 0;
-                                        while (t != 0) {
-                                                read_buf[bytes_read++] = (uint8_t)t;
-                                                t >>= 8;
-                                        }
+                                t = filesize;
+                                /*bytes_read = 0; - already is */
+                                while (t != 0) {
+                                        read_buf[bytes_read++] = (uint8_t)t;
+                                        t >>= 8;
                                 }
+#endif
                         }
                         crc = (IS_CKSUM ? crc32_block_endian1 : crc32_block_endian0)(crc, read_buf, bytes_read, crc32_table);
-                        if (fd < 0)
+                        if (ENABLE_CKSUM && fd < 0)
                                 break;
                 }
 
                 crc = ~crc;
+#if ENABLE_CKSUM
                 if (IS_CKSUM)
                         printf((*argv ? "%u %"OFF_FMT"u %s\n" : "%u %"OFF_FMT"u\n"),
                                 (unsigned)crc, filesize, *argv);
                 else
+#endif
                         printf((*argv ? "%08x %s\n" : "%08x\n"),
                                 (unsigned)crc, *argv);
         } while (*argv && *++argv);