diff options
| -rw-r--r-- | coreutils/Config.in | 6 | ||||
| -rw-r--r-- | coreutils/Makefile.in | 1 | ||||
| -rw-r--r-- | coreutils/sum.c | 182 |
3 files changed, 189 insertions, 0 deletions
diff --git a/coreutils/Config.in b/coreutils/Config.in index 466e8b880..677970d1f 100644 --- a/coreutils/Config.in +++ b/coreutils/Config.in @@ -428,6 +428,12 @@ config CONFIG_STTY help stty is used to change and print terminal line settings. +config CONFIG_SUM + bool "sum" + default n + help + checksum and count the blocks in a file + config CONFIG_SYNC bool "sync" default n diff --git a/coreutils/Makefile.in b/coreutils/Makefile.in index 130bdf48b..c9c42e091 100644 --- a/coreutils/Makefile.in +++ b/coreutils/Makefile.in @@ -71,6 +71,7 @@ COREUTILS-$(CONFIG_SHA1SUM) += md5_sha1_sum.o COREUTILS-$(CONFIG_SLEEP) += sleep.o COREUTILS-$(CONFIG_SORT) += sort.o COREUTILS-$(CONFIG_STTY) += stty.o +COREUTILS-$(CONFIG_SUM) += sum.o COREUTILS-$(CONFIG_SYNC) += sync.o COREUTILS-$(CONFIG_TAIL) += tail.o COREUTILS-$(CONFIG_TEE) += tee.o diff --git a/coreutils/sum.c b/coreutils/sum.c new file mode 100644 index 000000000..2618648b2 --- /dev/null +++ b/coreutils/sum.c @@ -0,0 +1,182 @@ +/* + * sum -- checksum and count the blocks in a file + * Like BSD sum or SysV sum -r, except like SysV sum if -s option is given. + * + * Copyright (C) 86, 89, 91, 1995-2002, 2004 Free Software Foundation, Inc. + * Copyright (C) 2005 by Erik Andersen <andersen@codepoet.org> + * Copyright (C) 2005 by Mike Frysinger <vapier@gentoo.org> + * + * Written by Kayvan Aghaiepour and David MacKenzie + * Taken from coreutils and turned into a busybox applet by Mike Frysinger + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + */ + +#include <stdio.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <fcntl.h> +#include <unistd.h> +#include <getopt.h> + +#include "libbb.h" + +/* 1 if any of the files read were the standard input */ +static int have_read_stdin; + +/* make a little more readable and avoid using strcmp for just 2 bytes */ +#define IS_STDIN(s) (s[0] == '-' && s[1] == '\0') + +/* 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) +{ + register FILE *fp; + register int checksum = 0; /* The checksum mod 2^16. */ + register uintmax_t total_bytes = 0; /* The number of bytes. */ + register int ch; /* Each character read. */ + + if (IS_STDIN(file)) { + fp = stdin; + have_read_stdin = 1; + } else { + fp = fopen(file, "r"); + if (fp == NULL) { + bb_perror_msg("%s", file); + return 0; + } + } + + 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("%s", file); + if (!IS_STDIN(file)) + fclose(fp); + return 0; + } + + if (!IS_STDIN(file) && fclose(fp) == EOF) { + bb_perror_msg("%s", file); + return 0; + } + + printf("%05d %5s", checksum, + make_human_readable_str(total_bytes, 1, 1024)); + if (print_name > 1) + printf(" %s", file); + putchar('\n'); + + return 1; +} + +/* 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. */ +static int sysv_sum_file(const char *file, int print_name) +{ + int fd; + unsigned char buf[8192]; + uintmax_t total_bytes = 0; + int r; + int checksum; + + /* The sum of all the input bytes, modulo (UINT_MAX + 1). */ + unsigned int s = 0; + + if (IS_STDIN(file)) { + fd = 0; + have_read_stdin = 1; + } else { + fd = open(file, O_RDONLY); + if (fd == -1) { + bb_perror_msg("%s", file); + return 0; + } + } + + while (1) { + size_t i; + size_t bytes_read = safe_read(fd, buf, sizeof(buf)); + + if (bytes_read == 0) + break; + + if (bytes_read == -1) { + bb_perror_msg("%s", file); + if (!IS_STDIN(file)) + close(fd); + return 0; + } + + for (i = 0; i < bytes_read; i++) + s += buf[i]; + total_bytes += bytes_read; + } + + if (!IS_STDIN(file) && close(fd) == -1) { + bb_perror_msg("%s", file); + return 0; + } + + r = (s & 0xffff) + ((s & 0xffffffff) >> 16); + checksum = (r & 0xffff) + (r >> 16); + + printf("%d %s", checksum, + make_human_readable_str(total_bytes, 1, 512)); + if (print_name) + printf(" %s", file); + putchar('\n'); + + return 1; +} + +int sum_main(int argc, char **argv) +{ + int flags; + int ok; + int files_given; + int (*sum_func)(const char *, int) = bsd_sum_file; + + /* give the bsd func priority over sysv func */ + flags = bb_getopt_ulflags(argc, argv, "sr"); + if (flags & 1) + sum_func = sysv_sum_file; + if (flags & 2) + sum_func = bsd_sum_file; + + have_read_stdin = 0; + files_given = argc - optind; + if (files_given <= 0) + ok = sum_func("-", files_given); + else + for (ok = 1; optind < argc; optind++) + ok &= sum_func(argv[optind], files_given); + + if (have_read_stdin && fclose(stdin) == EOF) + bb_perror_msg_and_die("-"); + + exit(ok ? EXIT_SUCCESS : EXIT_FAILURE); +} |