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authorGravatar Denis Vlasenko <vda.linux@googlemail.com>2006-12-23 15:58:11 +0000
committerGravatar Denis Vlasenko <vda.linux@googlemail.com>2006-12-23 15:58:11 +0000
commit9ac9e55e3c1dd11bf007623ea672f7569366c186 (patch)
tree7f3b46d7f2f01fed698b569b3217ab5b52413aac /coreutils
parente13a537795751bee8e2b7fe2b88c75436acd9da0 (diff)
downloadbusybox-9ac9e55e3c1dd11bf007623ea672f7569366c186.tar.gz
busybox-9ac9e55e3c1dd11bf007623ea672f7569366c186.tar.bz2
sum: 40% size reduction (-300 bytes)
find: one_char -> LONE_CHAR
Diffstat (limited to 'coreutils')
-rw-r--r--coreutils/sum.c155
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;
}