sum: 40% size reduction (-300 bytes)

find: one_char -> LONE_CHAR

1 files changed, 48 insertions, 107 deletions

diff --git a/coreutils/sum.c b/coreutils/sum.c
index 68a857816..df5804899 100644
--- a/coreutils/sum.c
+++ b/coreutils/sum.c
@@ -15,139 +15,80 @@
 
 #include "busybox.h"
 
-/* 1 if any of the files read were the standard input */
-static int have_read_stdin;
+enum { sysv_sum, bsd_sum };
 
-/* 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)
+/* BSD: calculate and print the rotated checksum and the size in 1K blocks
+   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 int sum_file(const char *file, int type, 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 (LONE_DASH(file)) {
-		fp = stdin;
-		have_read_stdin++;
-	} else {
-		fp = fopen_or_warn(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);
-		fclose_if_not_stdin(fp);
-		goto out;
-	}
-
-	if (fclose_if_not_stdin(fp) == EOF) {
-		bb_perror_msg(file);
-		goto out;
-	}
-	ret++;
-	printf("%05d %5ju ", checksum, (total_bytes+1023)/1024);
-	if (print_name > 1)
-		puts(file);
-	else
-		puts("");
-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;
+#define buf bb_common_bufsiz1
+	int r, fd;
 	uintmax_t total_bytes = 0;
 
 	/* The sum of all the input bytes, modulo (UINT_MAX + 1).  */
-	unsigned int s = 0;
+	unsigned s = 0;
 
-	if (LONE_DASH(file)) {
-		fd = 0;
-		have_read_stdin = 1;
-	} else {
+	fd = 0;
+	if (NOT_LONE_DASH(file)) {
 		fd = open(file, O_RDONLY);
 		if (fd == -1)
-			goto release_and_ret;
+			goto ret_bad;
 	}
 
 	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:
+		size_t bytes_read = safe_read(fd, buf, BUFSIZ);
+
+		if ((ssize_t)bytes_read <= 0) {
+			r = (fd && close(fd) != 0);
+			if (!bytes_read && !r)
+				/* no error */
+				break;
+ ret_bad:
 			bb_perror_msg(file);
-			RELEASE_CONFIG_BUFFER(buf);
-			if (NOT_LONE_DASH(file))
-				close(fd);
 			return 0;
 		}
 
 		total_bytes += bytes_read;
-		while (bytes_read--)
-			s += buf[bytes_read];
+		if (type == sysv_sum) {
+			do s += buf[--bytes_read]; while (bytes_read);
+		} else {
+			r = 0;
+			do {
+				s = (s >> 1) + ((s & 1) << 15);
+				s += buf[r++];
+				s &= 0xffff; /* Keep it within bounds. */
+			} while (--bytes_read);
+		}
 	}
 
-	if (NOT_LONE_DASH(file) && close(fd) == -1)
-		goto release_and_ret;
-	else
-		RELEASE_CONFIG_BUFFER(buf);
-
-	{
-		int r = (s & 0xffff) + ((s & 0xffffffff) >> 16);
+	if (!print_name) file = "";
+	if (type == sysv_sum) {
+		r = (s & 0xffff) + ((s & 0xffffffff) >> 16);
 		s = (r & 0xffff) + (r >> 16);
-
-		printf("%d %ju ", s, (total_bytes+511)/512);
-	}
-	puts(print_name ? file : "");
-
+		printf("%d %ju %s\n", s, (total_bytes+511)/512, file);
+	} else
+		printf("%05d %5ju %s\n", s, (total_bytes+1023)/1024, file);
 	return 1;
+#undef buf
 }
 
 int sum_main(int argc, char **argv)
 {
-	int flags;
-	int ok;
-	int (*sum_func)(const char *, int) = bsd_sum_file;
+	int n;
+	int type = bsd_sum;
 
-	/* give the bsd func priority over sysv func */
-	flags = getopt32(argc, argv, "sr");
-	if (flags & 1)
-		sum_func = sysv_sum_file;
-	if (flags & 2)
-		sum_func = bsd_sum_file;
+	n = getopt32(argc, argv, "sr");
+	if (n & 1) type = sysv_sum;
+	/* give the bsd priority over sysv func */
+	if (n & 2) type = bsd_sum;
 
-	have_read_stdin = 0;
-	if ((argc - optind) == 0)
-		ok = sum_func("-", 0);
+	if (argc == optind)
+		n = sum_file("-", type, 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("-");
+		for (n = 1; optind < argc; optind++)
+			n &= sum_file(argv[optind], type, 1);
 
-	exit(ok ? EXIT_SUCCESS : EXIT_FAILURE);
+	return !n;
 }