dj(1) - disk jockey #28
@ -57,6 +57,9 @@ test: build
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tests/cc-compat.sh
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tests/posix-compat.sh
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dj: src/dj.c build_dir
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$(CC) $(CFLAGS) -o build/bin/dj src/dj.c
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false: src/false.rs build_dir
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$(RUSTC) $(RUSTCFLAGS) -o build/bin/false src/false.rs
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155
docs/dj.1
Normal file
155
docs/dj.1
Normal file
@ -0,0 +1,155 @@
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.TH dj 1
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.SH NAME
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dj \(en disk jockey
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.SH SYNOPSIS
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dj
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.RB ( -AdHnq )
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.RB ( -a
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.RB [ byte ])
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.RB ( -c
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.RB [ count ])
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.RB ( -i
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.R [
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.B input file
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.R ])
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.RB ( -b
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.R [
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.B input block size
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.R ])
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.RB ( -s
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.R [
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.B input offset
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.R ])
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.RB ( -o
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.R [
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.B output file
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.R ])
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.RB ( -B
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.R [
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.B output block size
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.R ])
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.RB ( -S
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.R [
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.B output offset
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.R ])
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.SH USAGE
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The
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.B -i
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option takes a path as an argument to open and use in place of standard input.
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The
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.B -o
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option does the same in place of standard output. Dj does not truncate output
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files and instead writes over the bytes in the existing file.
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.PP
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The
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.B -b
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option takes a numeric argument as the size in bytes of the input buffer and
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the
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.B -B
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option does the same for the output buffer, the default for both being 1024
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bytes, or one kibibyte (KiB).
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.PP
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The
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.B -s
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option takes a numeric argument as the number of bytes to skip into the input
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before starting to read, and the
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.B -S
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option skips a number of bytes through the output before starting to write from
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the input. If the input is a stream the bytes are read and discarded. If the
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output is a stream, nul characters are printed.
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.PP
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The
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.B -a
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option takes one argument of one byte in length and pads the input buffer with
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that byte in the event that a read doesn't fill the input buffer, and the
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.B -A
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option takes no arguments and pads with nuls.
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The
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.B -c
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option specifies an amount of reads to make, and if 0 (the default) dj will
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continue reading until a partial or empty read.
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.PP
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On a partial or empty read, dj prints a diagnostic message (unless the
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.B -q
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option is specified) and exits (unless the
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.B -n
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option is specified, in which case only two consecutive empty reads will cause
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dj to exit).
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At exit, usage statistics are printed unless the option
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.B -q
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is specified a second time. The
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.B -H
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option will make these diagnostics human-readable.
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.SH DIAGNOSTICS
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The
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.B -d
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option prints all information, user-specified or otherwise, before program
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execution.
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.PP
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When dj exits, by default statistics are printed for input and output to
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standard error in the following format:
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.PP
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.R {records read} {ASCII unit separator} {partial records read}
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.R {ASCII record separator} {records written} {ASCII unit separator}
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.R {partial records written} {ASCII group separator} {bytes read}
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.R {ASCII record separator} {bytes written} {ASCII file separator}
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.PP
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If the
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.B -H
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option is specified dj instead uses this following format:
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.PP
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.R {records read} '+' {partial records read} '>' {records written}
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.R '+' {partial records written} ';' {bytes read} '>' {bytes written}
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.R {ASCII line feed}
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.PP
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The
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.B -q
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option suppresses error messages which print when a read or write is partial or
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empty and when used twice suppresses diagnostic output entirely.
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.PP
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In non-recoverable errors that don't pertain to dj's read-write cycle, a
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diagnostic message is printed and dj exits with the appropriate sysexits(3)
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status.
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.SH BUGS
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If
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.B -n
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is specified along with a specified count, actual byte output may be lower than
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expected (the product of the count multiplied by the input block size). If the
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.B -a
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or
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.B -A
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options are used this could make data written nonsensical.
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.PP
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Many lowercase options have capitalized variants and vice-versa which can be
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confusing. Capitalized options tend to affect output or are more intense
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versions of lowercase options.
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.SH RATIONALE
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Dj was modeled after the dd utility specified in POSIX but adds additional
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features: typical option formatting, allowing seeks to be specified in bytes
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rather than in blocks, allowing arbitrary bytes as padding, and printing in a
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format that's easy to parse for machines. It also neglects character
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conversion, which may be dd's original intent but is irrelevant to its modern
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use.
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.SH COPYRIGHT
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Copyright (C) 2023 DTB. License AGPLv3+: GNU AGPL version 3 or later
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<https://gnu.org/licenses/agpl.html>.
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.SH SEE ALSO
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dd(1)
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429
src/dj.c
Normal file
429
src/dj.c
Normal file
@ -0,0 +1,429 @@
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#include <ctype.h> /* isupper(3), tolower(3) */
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#include <errno.h> /* errno */
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#include <fcntl.h> /* open(2) */
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#include <stdio.h> /* fprintf(3), stderr */
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#include <stdlib.h> /* free(3), malloc(3), strtol(3), size_t */
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#include <string.h> /* memcpy(3), memmove(3), memset(3) */
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#include <sysexits.h> /* EX_OK, EX_USAGE */
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#include <unistd.h> /* close(2), getopt(3), lseek(2), read(2), write(2),
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optarg, optind, STDIN_FILENO, STDOUT_FILENO */
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extern int errno;
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/* dj uses two structures that respectively correspond to the reading and
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* writing ends of its jockeyed "pipe". User-configurable members are noted
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* with their relevant options. */
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struct Io{
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int bs; /* buffer size (-bB) */
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size_t bufuse; /* buffer usage */
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char *buf; /* buffer */
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int bytes; /* bytes processed */
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int fd; /* file descriptor */
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int fl; /* file opening flags */
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char *fn; /* file name (may be stdin_name or stdout_name) (-io) */
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int prec; /* partial records processed */
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int rec; /* records processed */
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long seek; /* bytes to seek/skip (will be 0 after skippage) (-sS) */
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} ep[2]; /* "engineered pipe"; also "extended play", for the deejay */
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/* Additionally, the following global variables are used to store user options.
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*/
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/* (-a) */ static int align; /* Only the lower 8b are used but align is
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* negative if no alignment is being done. */
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/* (-c) */ static int count; /* 0 if dj(1) runs until no more reads are
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* possible. */
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/* ASCII field separator delimited statistics */
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static char *fmt_asv = "%d\037%d\036%d\037%d\035%d\036%d\034";
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/* human-readable statistics */
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static char *fmt_human = "%d+%d > %d+%d; %d > %d\n";
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/* pointer to chosen formatting */
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/* (-H) */ static char *fmt_output; /* fmt_asv (default) or fmt_human (-H) */
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/* (-dq) */ static char debug; /*
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* -d increments dj -qq | 0 - no diagnostic output whatsoever
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* -q decrements dj -q | 1 - typical output without
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* | notifications on partial reads or
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* | writes
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* dj | 2 - typical output (default)
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* dj -d | 3 - verbose status messages */
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/* (-n) */ static char noerror; /* 0 - exits on partial reads or writes
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* (default)
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* 1 - retries on partial reads/writes
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* (-f) */
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/* Non-configurable defaults. */
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#define bs_default 1024 /* GNU dd(1) default; twice POSIX but a neat 2^10 */
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static char *program_name = "<no argv[0]>";
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static char *stdin_name = "<stdin>";
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static char *stdout_name = "<stdout>";
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static int read_flags = O_RDONLY; /* These flags are consistent with Busybox */
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static int write_flags = O_WRONLY | O_CREAT; /* dd(1). */
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/* Macro to set defaults for user-configurable options. */
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#define setdefaults do{ \
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align = -1; \
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count = 0; \
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debug = 2; \
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fmt_output = fmt_asv; \
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noerror = 0; \
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ep[0].fl = read_flags; \
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Io_setdefaults(&ep[0]); \
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ep[1].fl = write_flags; \
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Io_setdefaults(&ep[1]); }while(0)
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#define MIN(a, b) (((a) < (b)) ? (a) : (b))
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/* Macro to check if fd is a std* file, e.g. stdin. */
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#define fdisstd(fd) \
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((fd) == STDIN_FILENO \
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|| (fd) == STDOUT_FILENO \
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|| (fd) == STDERR_FILENO)
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|
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/* Macro to call the cleanup functions that operate on struct io on the
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* particular io[2] used in main. Error conditions are not checked because this
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* is only used when the program is about to terminate (hence its name). */
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#define terminate(io) do{ \
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Io_buffree(&(io)[0]); \
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Io_buffree(&(io)[1]); \
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Io_fdclose(&(io)[0]); \
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Io_fdclose(&(io)[1]); }while(0)
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/* Allocates *io's buffer. Returns NULL if unsuccessful. */
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static void *
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Io_bufalloc(struct Io *io){
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return (io->buf = malloc(io->bs * (sizeof *io->buf)));
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}
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/* Frees *io's buffer. Returns io. */
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static struct Io *
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Io_buffree(struct Io *io){
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free(io->buf);
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return io;
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}
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/* Fills the unused portion of io's buffer with padding, updating io->bufuse.
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* Returns io. */
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static struct Io *
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Io_bufrpad(struct Io *io, int padding){
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memset(io->buf + io->bufuse, padding, io->bs - io->bufuse);
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io->bufuse = io->bs;
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return io;
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}
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|
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/* Copies from the buffer in src as much as possible to the free space in the
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* dest buffer, removing the copied units from src and permuting the remaining
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* units in the src buffer to the start of the buffer, modifying both the src
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* and dest bufuse and returning dest. */
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static struct Io*
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Io_bufxapp(struct Io *dest, struct Io *src){
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int n;
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n = MIN(src->bufuse, dest->bs - dest->bufuse);
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memcpy(dest->buf + dest->bufuse, src->buf, n);
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dest->bufuse += n;
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memmove(src->buf, src->buf + n, src->bs - n);
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src->bufuse -= n;
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return dest;
|
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}
|
||||
|
||||
/* Copies from the buffer in src to the buffer in dest no more than n units,
|
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* removing the copied units from src and permuting the remaining units in the
|
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* src buffer to the start of the buffer, modifying both the src and dest
|
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* bufuse and returning dest. */
|
||||
static struct Io*
|
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Io_bufxfer(struct Io *dest, struct Io *src, int n){
|
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|
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memcpy(dest->buf, src->buf, (dest->bufuse = n));
|
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memmove(src->buf, src->buf + n, (src->bufuse -= n));
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|
||||
return dest;
|
||||
}
|
||||
|
||||
/* Closes io->fn and returns -1 on error, otherwise io->fd. */
|
||||
static int
|
||||
Io_fdclose(struct Io *io){
|
||||
|
||||
return fdisstd(io->fd)
|
||||
? 0
|
||||
: close(io->fd);
|
||||
}
|
||||
|
||||
/* Opens io->fn and saves the file descriptor into io->fd. Returns io->fd,
|
||||
* which will be -1 if an error occured. */
|
||||
static int
|
||||
Io_fdopen(struct Io *io, char *fn){
|
||||
int fd;
|
||||
|
||||
if((fd = open(fn, io->fl,
|
||||
/* these are the flags used by touch(1p) */
|
||||
S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH))
|
||||
!= -1
|
||||
&& Io_fdclose(io) == 0){
|
||||
io->fd = fd;
|
||||
io->fn = fn;
|
||||
}
|
||||
|
||||
return fd;
|
||||
}
|
||||
|
||||
/* Seeks io->seek bytes through *io's file descriptor, (counter-intuitively)
|
||||
* returning -1 if successful and a sysexits.h exit code if an unrecoverable
|
||||
* error occurred. io->buf will be cleared of useful bytes and io->seek will
|
||||
* be set to zero to indicate the seek occurred. */
|
||||
static int
|
||||
Io_fdseek(struct Io *io){
|
||||
int (*op)(int, void *, size_t);
|
||||
|
||||
if(!fdisstd(io->fd) && lseek(io->fd, io->seek, SEEK_SET) != -1)
|
||||
return -1;
|
||||
else if(io->fl == write_flags){
|
||||
memset(io->buf, '\0', io->bs);
|
||||
/* This is a dirty trick; rather than testing conditions and operating
|
||||
* likewise, because the parameters to read or write are going to be
|
||||
* the same either way, just use a function pointer to keep track of
|
||||
* the intended operation. */
|
||||
op = (int (*)(int, void *, size_t))&write;
|
||||
/* Function pointer casts are risky; this works because the difference
|
||||
* is in the second parameter and only that write(2) makes the buffer
|
||||
* const whereas read(2) does not. To avoid even the slightest
|
||||
* undefined behavior comment out the cast, just be ready for a
|
||||
* -Wincompatible-function-pointer-types if your compiler notices it.
|
||||
*/
|
||||
}else
|
||||
op = &read;
|
||||
|
||||
/* We're going to cheat and use bufuse as the retval for write(2), which is
|
||||
* fine because it'll be zeroed as this function returns anyway. */
|
||||
do{ if( (io->bufuse = (*op)(io->fd, io->buf, MIN(io->bs, io->seek))) == 0)
|
||||
/* second chance */
|
||||
io->bufuse = (*op)(io->fd, io->buf, MIN(io->bs, io->seek));
|
||||
}while((io->seek -= io->bufuse) > 0 && io->bufuse != 0);
|
||||
|
||||
io->bufuse = 0;
|
||||
|
||||
return -1;
|
||||
}
|
||||
|
||||
/* Reads io->bs bytes from *io's file descriptor into io->buf, storing the
|
||||
* number of read bytes in io->bufuse and updating io->bytes. If io->bufuse is
|
||||
* 0, errno will probably be set. Returns io. */
|
||||
static struct Io *
|
||||
Io_read(struct Io *io){
|
||||
|
||||
io->bytes += (io->bufuse = read(io->fd, io->buf, io->bs));
|
||||
|
||||
return io;
|
||||
}
|
||||
|
||||
/* Sets the variables in a struct *io to the defaults. Identifies the read/
|
||||
* write ends of the "pipe" by checking io->fl. Returns io. */
|
||||
static struct Io *
|
||||
Io_setdefaults(struct Io *io){
|
||||
|
||||
io->bs = bs_default;
|
||||
io->buf = NULL;
|
||||
io->bytes = 0;
|
||||
io->fd = (io->fl == read_flags) ? STDIN_FILENO : STDOUT_FILENO;
|
||||
io->fn = (io->fl == read_flags) ? stdin_name : stdout_name;
|
||||
io->prec = 0;
|
||||
io->rec = 0;
|
||||
io->seek = 0;
|
||||
|
||||
return io;
|
||||
}
|
||||
|
||||
/* Writes io->bufuse units from io->buf to io->fd, permuting any unwritten
|
||||
* bytes to the start of io->buf and updating io->bufuse. If io->bufuse doesn't
|
||||
* change, errno will probably be set. Returns io. */
|
||||
static struct Io *
|
||||
Io_write(struct Io *io){
|
||||
int t;
|
||||
|
||||
if((t = write(io->fd, io->buf, io->bufuse)) > 0)
|
||||
memmove(io->buf, io->buf + t, (io->bufuse -= t));
|
||||
io->bytes += t;
|
||||
|
||||
return io;
|
||||
}
|
||||
|
||||
/* Prints an error message suitable for the event of an operating system error,
|
||||
* with the error itself to be described in the string s. */
|
||||
static int
|
||||
oserr(char *s){
|
||||
|
||||
fprintf(stderr, "%s: %s: %s\n", program_name, s, strerror(errno));
|
||||
|
||||
return EX_OSERR;
|
||||
}
|
||||
|
||||
/* Prints statistics regarding the use of dj, particularly partially and
|
||||
* completely read and written records, accessing debug, ep, and fmt_output. */
|
||||
static void
|
||||
output(void){
|
||||
|
||||
if(debug >= 1)
|
||||
fprintf(stderr, fmt_output,
|
||||
ep[0].rec, ep[0].prec, ep[1].rec, ep[1].prec,
|
||||
ep[0].bytes, ep[1].bytes);
|
||||
|
||||
return;
|
||||
}
|
||||
|
||||
/* Parses the string s to an integer, returning either the integer or in the
|
||||
* case of an error a negative integer. This is used for argument parsing
|
||||
* (e.g. -B [int]) in dj and no negative integer would be valid anyway. */
|
||||
static long
|
||||
parse(char *s){
|
||||
long r;
|
||||
|
||||
errno = 0;
|
||||
r = strtol(s, &s, 0);
|
||||
return (*s == '\0' /* no chars left unparsed */ && errno == 0)
|
||||
? r
|
||||
: -1;
|
||||
}
|
||||
|
||||
static int
|
||||
usage(void){
|
||||
|
||||
fprintf(stderr, "Usage: %s (-AdfHqQ) (-a [byte]) (-c [count])\n"
|
||||
"\t(-i [input file]) (-b [input block size]) (-s [input offset])\n"
|
||||
"\t(-o [output file]) (-B [output block size]) (-S [output offset])\n",
|
||||
program_name);
|
||||
|
||||
return EX_USAGE;
|
||||
}
|
||||
|
||||
int main(int argc, char *argv[]){
|
||||
int c;
|
||||
int i;
|
||||
|
||||
setdefaults;
|
||||
|
||||
if(argc > 0){
|
||||
program_name = argv[0];
|
||||
while((c = getopt(argc, argv, "a:Ab:B:c:di:fhHqs:S:o:")) != -1)
|
||||
switch(c){
|
||||
case 'i': case 'o':
|
||||
if(Io_fdopen(&ep[c == 'o'], optarg) != -1)
|
||||
break;
|
||||
terminate(ep);
|
||||
return oserr(optarg);
|
||||
case 'A': align = '\0'; break;
|
||||
case 'd': ++debug; break;
|
||||
case 'n': noerror = 1; break;
|
||||
case 'H': fmt_output = fmt_human; break;
|
||||
case 'q': --debug; break;
|
||||
case 'a':
|
||||
if(optarg[0] != '\0' && optarg[1] == '\0'){
|
||||
align = optarg[0];
|
||||
break;
|
||||
}
|
||||
/* FALLTHROUGH */
|
||||
case 'c': case 'b': case 's': case 'B': case 'S':
|
||||
if(c == 'c' && (count = parse(optarg)) >= 0)
|
||||
break;
|
||||
i = isupper(c);
|
||||
c = tolower(c);
|
||||
if((c == 'b' && (ep[i].bs = parse(optarg)) > 0)
|
||||
|| (c == 's' && (ep[i].seek = parse(optarg)) >= 0))
|
||||
break;
|
||||
/* FALLTHROUGH */
|
||||
default:
|
||||
terminate(ep);
|
||||
return usage();
|
||||
}
|
||||
}
|
||||
|
||||
if(debug >= 3)
|
||||
fprintf(stderr,
|
||||
"argv0=%s\n"
|
||||
"in=%s\tibs=%d\tskip=%ld\talign=%hhx\tcount=%d\n"
|
||||
"out=%s\tobs=%d\tseek=%ld\tdebug=%2d\tnoerror=%d\n",
|
||||
program_name,
|
||||
ep[0].fn, ep[0].bs, ep[0].seek, align, count,
|
||||
ep[1].fn, ep[1].bs, ep[1].seek, debug, noerror);
|
||||
|
||||
if(argc > optind){
|
||||
terminate(ep);
|
||||
return usage();
|
||||
}
|
||||
|
||||
for(i = 0; i <= 1; ++i){
|
||||
if(Io_bufalloc(&ep[i]) == NULL){
|
||||
fprintf(stderr, "%s: Failed to allocate %d bytes\n",
|
||||
program_name, ep[i].bs);
|
||||
terminate(ep);
|
||||
return EX_OSERR;
|
||||
}else if(ep[i].seek > 0)
|
||||
switch(Io_fdseek(&ep[i])){
|
||||
case EX_OK:
|
||||
output();
|
||||
terminate(ep);
|
||||
return EX_OK;
|
||||
}
|
||||
}
|
||||
|
||||
do{ /* read */
|
||||
Io_read(&ep[0]);
|
||||
if(!noerror && ep[0].bufuse == 0)
|
||||
Io_read(&ep[0]); /* second chance */
|
||||
if(ep[0].bufuse == 0) /* that's all she wrote */
|
||||
break;
|
||||
else if(ep[0].bufuse < ep[0].bs){
|
||||
++ep[0].prec;
|
||||
if(debug >= 2){
|
||||
fprintf(stderr, "%s: Partial read:\n\t", program_name);
|
||||
output();
|
||||
}
|
||||
if(!noerror)
|
||||
count = 1;
|
||||
if(align >= 0)
|
||||
Io_bufrpad(&ep[0], align);
|
||||
}else
|
||||
++ep[0].rec;
|
||||
|
||||
/* write */
|
||||
do{ if(ep[1].bs > ep[0].bs){ /* io[1].bs > io[0].bs */
|
||||
Io_bufxapp(&ep[1], &ep[0]);
|
||||
if(ep[0].bs + ep[1].bufuse <= ep[1].bs && count != 1)
|
||||
continue; /* we could write more */
|
||||
}else
|
||||
Io_bufxfer(&ep[1], &ep[0], MIN(ep[0].bufuse, ep[1].bs));
|
||||
|
||||
c = ep[1].bufuse;
|
||||
Io_write(&ep[1]);
|
||||
if(!noerror && ep[1].bufuse == c)
|
||||
Io_write(&ep[1]); /* second chance */
|
||||
if(c == ep[1].bufuse){ /* no more love */
|
||||
count = 1;
|
||||
break;
|
||||
}else if(c > ep[1].bufuse && ep[1].bufuse > 0){
|
||||
ep[1].prec += 1;
|
||||
if(debug >= 2){
|
||||
fprintf(stderr, "%s: Partial write:\n\t", program_name);
|
||||
output();
|
||||
}
|
||||
if(!noerror)
|
||||
count = 1;
|
||||
}else if(ep[1].bufuse == 0 && c < ep[1].bs)
|
||||
++ep[1].prec;
|
||||
else
|
||||
++ep[1].rec;
|
||||
}while(ep[0].bufuse > 0);
|
||||
}while(count == 0 || --count > 0);
|
||||
|
||||
output();
|
||||
terminate(ep);
|
||||
|
||||
return EX_OK;
|
||||
}
|
||||
Loading…
x
Reference in New Issue
Block a user