| 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Mini dd implementation for busybox
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| 4 | *
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| 5 | *
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| 6 | * Copyright (C) 2000,2001 Matt Kraai
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| 7 | *
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| 8 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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| 9 | */
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| 10 |
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| 11 | //config:config DD
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| 12 | //config: bool "dd"
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| 13 | //config: default y
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| 14 | //config: help
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| 15 | //config: dd copies a file (from standard input to standard output,
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| 16 | //config: by default) using specific input and output blocksizes,
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| 17 | //config: while optionally performing conversions on it.
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| 18 | //config:
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| 19 | //config:config FEATURE_DD_SIGNAL_HANDLING
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| 20 | //config: bool "Enable signal handling for status reporting"
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| 21 | //config: default y
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| 22 | //config: depends on DD
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| 23 | //config: help
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| 24 | //config: Sending a SIGUSR1 signal to a running `dd' process makes it
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| 25 | //config: print to standard error the number of records read and written
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| 26 | //config: so far, then to resume copying.
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| 27 | //config:
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| 28 | //config: $ dd if=/dev/zero of=/dev/null &
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| 29 | //config: $ pid=$!; kill -USR1 $pid; sleep 1; kill $pid
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| 30 | //config: 10899206+0 records in
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| 31 | //config: 10899206+0 records out
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| 32 | //config:
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| 33 | //config:config FEATURE_DD_THIRD_STATUS_LINE
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| 34 | //config: bool "Enable the third status line upon signal"
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| 35 | //config: default y
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| 36 | //config: depends on DD && FEATURE_DD_SIGNAL_HANDLING
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| 37 | //config: help
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| 38 | //config: Displays a coreutils-like third status line with transferred bytes,
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| 39 | //config: elapsed time and speed.
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| 40 | //config:
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| 41 | //config:config FEATURE_DD_IBS_OBS
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| 42 | //config: bool "Enable ibs, obs and conv options"
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| 43 | //config: default y
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| 44 | //config: depends on DD
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| 45 | //config: help
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| 46 | //config: Enables support for writing a certain number of bytes in and out,
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| 47 | //config: at a time, and performing conversions on the data stream.
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| 48 | //config:
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| 49 | //config:config FEATURE_DD_STATUS
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| 50 | //config: bool "Enable status display options"
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| 51 | //config: default y
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| 52 | //config: depends on DD
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| 53 | //config: help
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| 54 | //config: Enables support for status=noxfer/none option.
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| 55 |
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| 56 | //usage:#define dd_trivial_usage
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| 57 | //usage: "[if=FILE] [of=FILE] " IF_FEATURE_DD_IBS_OBS("[ibs=N] [obs=N] ") "[bs=N] [count=N] [skip=N]\n"
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| 58 | //usage: " [seek=N]" IF_FEATURE_DD_IBS_OBS(" [conv=notrunc|noerror|sync|fsync] [iflag=skip_bytes]")
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| 59 | //usage:#define dd_full_usage "\n\n"
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| 60 | //usage: "Copy a file with converting and formatting\n"
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| 61 | //usage: "\n if=FILE Read from FILE instead of stdin"
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| 62 | //usage: "\n of=FILE Write to FILE instead of stdout"
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| 63 | //usage: "\n bs=N Read and write N bytes at a time"
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| 64 | //usage: IF_FEATURE_DD_IBS_OBS(
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| 65 | //usage: "\n ibs=N Read N bytes at a time"
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| 66 | //usage: )
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| 67 | //usage: IF_FEATURE_DD_IBS_OBS(
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| 68 | //usage: "\n obs=N Write N bytes at a time"
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| 69 | //usage: )
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| 70 | //usage: "\n count=N Copy only N input blocks"
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| 71 | //usage: "\n skip=N Skip N input blocks"
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| 72 | //usage: "\n seek=N Skip N output blocks"
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| 73 | //usage: IF_FEATURE_DD_IBS_OBS(
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| 74 | //usage: "\n conv=notrunc Don't truncate output file"
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| 75 | //usage: "\n conv=noerror Continue after read errors"
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| 76 | //usage: "\n conv=sync Pad blocks with zeros"
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| 77 | //usage: "\n conv=fsync Physically write data out before finishing"
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| 78 | //usage: "\n conv=swab Swap every pair of bytes"
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| 79 | //usage: "\n iflag=skip_bytes skip=N is in bytes"
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| 80 | //usage: )
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| 81 | //usage: IF_FEATURE_DD_STATUS(
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| 82 | //usage: "\n status=noxfer Suppress rate output"
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| 83 | //usage: "\n status=none Suppress all output"
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| 84 | //usage: )
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| 85 | //usage: "\n"
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| 86 | //usage: "\nN may be suffixed by c (1), w (2), b (512), kB (1000), k (1024), MB, M, GB, G"
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| 87 | //usage:
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| 88 | //usage:#define dd_example_usage
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| 89 | //usage: "$ dd if=/dev/zero of=/dev/ram1 bs=1M count=4\n"
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| 90 | //usage: "4+0 records in\n"
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| 91 | //usage: "4+0 records out\n"
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| 92 |
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| 93 | #include "libbb.h"
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| 94 | #include "common_bufsiz.h"
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| 95 |
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| 96 | /* This is a NOEXEC applet. Be very careful! */
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| 97 |
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| 98 |
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| 99 | enum {
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| 100 | ifd = STDIN_FILENO,
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| 101 | ofd = STDOUT_FILENO,
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| 102 | };
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| 103 |
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| 104 | struct globals {
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| 105 | off_t out_full, out_part, in_full, in_part;
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| 106 | #if ENABLE_FEATURE_DD_THIRD_STATUS_LINE
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| 107 | unsigned long long total_bytes;
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| 108 | unsigned long long begin_time_us;
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| 109 | #endif
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| 110 | int flags;
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| 111 | } FIX_ALIASING;
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| 112 | #define G (*(struct globals*)bb_common_bufsiz1)
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| 113 | #define INIT_G() do { \
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| 114 | setup_common_bufsiz(); \
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| 115 | /* we have to zero it out because of NOEXEC */ \
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| 116 | memset(&G, 0, sizeof(G)); \
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| 117 | } while (0)
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| 118 |
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| 119 | enum {
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| 120 | /* Must be in the same order as OP_conv_XXX! */
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| 121 | /* (see "flags |= (1 << what)" below) */
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| 122 | FLAG_NOTRUNC = (1 << 0) * ENABLE_FEATURE_DD_IBS_OBS,
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| 123 | FLAG_SYNC = (1 << 1) * ENABLE_FEATURE_DD_IBS_OBS,
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| 124 | FLAG_NOERROR = (1 << 2) * ENABLE_FEATURE_DD_IBS_OBS,
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| 125 | FLAG_FSYNC = (1 << 3) * ENABLE_FEATURE_DD_IBS_OBS,
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| 126 | FLAG_SWAB = (1 << 4) * ENABLE_FEATURE_DD_IBS_OBS,
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| 127 | /* end of conv flags */
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| 128 | /* start of input flags */
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| 129 | FLAG_IFLAG_SHIFT = 5,
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| 130 | FLAG_SKIP_BYTES = (1 << 5) * ENABLE_FEATURE_DD_IBS_OBS,
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| 131 | /* end of input flags */
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| 132 | FLAG_TWOBUFS = (1 << 6) * ENABLE_FEATURE_DD_IBS_OBS,
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| 133 | FLAG_COUNT = 1 << 7,
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| 134 | FLAG_STATUS = 1 << 8,
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| 135 | FLAG_STATUS_NONE = 1 << 9,
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| 136 | FLAG_STATUS_NOXFER = 1 << 10,
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| 137 | };
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| 138 |
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| 139 | static void dd_output_status(int UNUSED_PARAM cur_signal)
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| 140 | {
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| 141 | #if ENABLE_FEATURE_DD_THIRD_STATUS_LINE
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| 142 | double seconds;
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| 143 | unsigned long long bytes_sec;
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| 144 | unsigned long long now_us = monotonic_us(); /* before fprintf */
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| 145 | #endif
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| 146 |
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| 147 | /* Deliberately using %u, not %d */
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| 148 | fprintf(stderr, "%"OFF_FMT"u+%"OFF_FMT"u records in\n"
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| 149 | "%"OFF_FMT"u+%"OFF_FMT"u records out\n",
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| 150 | G.in_full, G.in_part,
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| 151 | G.out_full, G.out_part);
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| 152 |
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| 153 | #if ENABLE_FEATURE_DD_THIRD_STATUS_LINE
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| 154 | # if ENABLE_FEATURE_DD_STATUS
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| 155 | if (G.flags & FLAG_STATUS_NOXFER) /* status=noxfer active? */
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| 156 | return;
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| 157 | //TODO: should status=none make dd stop reacting to USR1 entirely?
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| 158 | //So far we react to it (we print the stats),
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| 159 | //status=none only suppresses final, non-USR1 generated status message.
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| 160 | # endif
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| 161 | fprintf(stderr, "%llu bytes (%sB) copied, ",
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| 162 | G.total_bytes,
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| 163 | /* show fractional digit, use suffixes */
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| 164 | make_human_readable_str(G.total_bytes, 1, 0)
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| 165 | );
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| 166 | /* Corner cases:
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| 167 | * ./busybox dd </dev/null >/dev/null
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| 168 | * ./busybox dd bs=1M count=2000 </dev/zero >/dev/null
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| 169 | * (echo DONE) | ./busybox dd >/dev/null
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| 170 | * (sleep 1; echo DONE) | ./busybox dd >/dev/null
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| 171 | */
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| 172 | seconds = (now_us - G.begin_time_us) / 1000000.0;
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| 173 | bytes_sec = G.total_bytes / seconds;
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| 174 | fprintf(stderr, "%f seconds, %sB/s\n",
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| 175 | seconds,
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| 176 | /* show fractional digit, use suffixes */
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| 177 | make_human_readable_str(bytes_sec, 1, 0)
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| 178 | );
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| 179 | #endif
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| 180 | }
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| 181 |
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| 182 | static ssize_t full_write_or_warn(const void *buf, size_t len,
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| 183 | const char *const filename)
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| 184 | {
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| 185 | ssize_t n = full_write(ofd, buf, len);
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| 186 | if (n < 0)
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| 187 | bb_perror_msg("writing '%s'", filename);
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| 188 | return n;
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| 189 | }
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| 190 |
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| 191 | static bool write_and_stats(const void *buf, size_t len, size_t obs,
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| 192 | const char *filename)
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| 193 | {
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| 194 | ssize_t n = full_write_or_warn(buf, len, filename);
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| 195 | if (n < 0)
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| 196 | return 1;
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| 197 | if ((size_t)n == obs)
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| 198 | G.out_full++;
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| 199 | else if (n) /* > 0 */
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| 200 | G.out_part++;
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| 201 | #if ENABLE_FEATURE_DD_THIRD_STATUS_LINE
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| 202 | G.total_bytes += n;
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| 203 | #endif
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| 204 | return 0;
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| 205 | }
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| 206 |
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| 207 | #if ENABLE_LFS
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| 208 | # define XATOU_SFX xatoull_sfx
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| 209 | #else
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| 210 | # define XATOU_SFX xatoul_sfx
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| 211 | #endif
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| 212 |
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| 213 | #if ENABLE_FEATURE_DD_IBS_OBS
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| 214 | static int parse_comma_flags(char *val, const char *words, const char *error_in)
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| 215 | {
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| 216 | int flags = 0;
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| 217 | while (1) {
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| 218 | int n;
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| 219 | char *arg;
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| 220 | /* find ',', replace them with NUL so we can use val for
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| 221 | * index_in_strings() without copying.
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| 222 | * We rely on val being non-null, else strchr would fault.
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| 223 | */
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| 224 | arg = strchr(val, ',');
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| 225 | if (arg)
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| 226 | *arg = '\0';
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| 227 | n = index_in_strings(words, val);
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| 228 | if (n < 0)
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| 229 | bb_error_msg_and_die(bb_msg_invalid_arg_to, val, error_in);
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| 230 | flags |= (1 << n);
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| 231 | if (!arg) /* no ',' left, so this was the last specifier */
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| 232 | break;
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| 233 | *arg = ','; /* to preserve ps listing */
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| 234 | val = arg + 1; /* skip this keyword and ',' */
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| 235 | }
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| 236 | return flags;
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| 237 | }
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| 238 | #endif
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| 239 |
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| 240 | int dd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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| 241 | int dd_main(int argc UNUSED_PARAM, char **argv)
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| 242 | {
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| 243 | static const char keywords[] ALIGN1 =
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| 244 | "bs\0""count\0""seek\0""skip\0""if\0""of\0"IF_FEATURE_DD_STATUS("status\0")
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| 245 | #if ENABLE_FEATURE_DD_IBS_OBS
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| 246 | "ibs\0""obs\0""conv\0""iflag\0"
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| 247 | #endif
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| 248 | ;
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| 249 | #if ENABLE_FEATURE_DD_IBS_OBS
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| 250 | static const char conv_words[] ALIGN1 =
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| 251 | "notrunc\0""sync\0""noerror\0""fsync\0""swab\0";
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| 252 | static const char iflag_words[] ALIGN1 =
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| 253 | "skip_bytes\0";
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| 254 | #endif
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| 255 | #if ENABLE_FEATURE_DD_STATUS
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| 256 | static const char status_words[] ALIGN1 =
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| 257 | "none\0""noxfer\0";
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| 258 | #endif
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| 259 | enum {
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| 260 | OP_bs = 0,
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| 261 | OP_count,
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| 262 | OP_seek,
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| 263 | OP_skip,
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| 264 | OP_if,
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| 265 | OP_of,
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| 266 | IF_FEATURE_DD_STATUS(OP_status,)
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| 267 | #if ENABLE_FEATURE_DD_IBS_OBS
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| 268 | OP_ibs,
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| 269 | OP_obs,
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| 270 | OP_conv,
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| 271 | OP_iflag,
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| 272 | /* Must be in the same order as FLAG_XXX! */
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| 273 | OP_conv_notrunc = 0,
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| 274 | OP_conv_sync,
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| 275 | OP_conv_noerror,
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| 276 | OP_conv_fsync,
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| 277 | OP_conv_swab,
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| 278 | /* Unimplemented conv=XXX: */
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| 279 | //nocreat do not create the output file
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| 280 | //excl fail if the output file already exists
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| 281 | //fdatasync physically write output file data before finishing
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| 282 | //lcase change upper case to lower case
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| 283 | //ucase change lower case to upper case
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| 284 | //block pad newline-terminated records with spaces to cbs-size
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| 285 | //unblock replace trailing spaces in cbs-size records with newline
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| 286 | //ascii from EBCDIC to ASCII
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| 287 | //ebcdic from ASCII to EBCDIC
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| 288 | //ibm from ASCII to alternate EBCDIC
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| 289 | /* Partially implemented: */
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| 290 | //swab swap every pair of input bytes: will abort on non-even reads
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| 291 | OP_iflag_skip_bytes,
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| 292 | #endif
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| 293 | };
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| 294 | smallint exitcode = EXIT_FAILURE;
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| 295 | int i;
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| 296 | size_t ibs = 512;
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| 297 | char *ibuf;
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| 298 | #if ENABLE_FEATURE_DD_IBS_OBS
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| 299 | size_t obs = 512;
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| 300 | char *obuf;
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| 301 | #else
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| 302 | # define obs ibs
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| 303 | # define obuf ibuf
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| 304 | #endif
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| 305 | /* These are all zeroed at once! */
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| 306 | struct {
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| 307 | size_t oc;
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| 308 | ssize_t prev_read_size; /* for detecting swab failure */
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| 309 | off_t count;
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| 310 | off_t seek, skip;
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| 311 | const char *infile, *outfile;
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| 312 | } Z;
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| 313 | #define oc (Z.oc )
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| 314 | #define prev_read_size (Z.prev_read_size)
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| 315 | #define count (Z.count )
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| 316 | #define seek (Z.seek )
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| 317 | #define skip (Z.skip )
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| 318 | #define infile (Z.infile )
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| 319 | #define outfile (Z.outfile)
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| 320 |
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| 321 | memset(&Z, 0, sizeof(Z));
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| 322 | INIT_G();
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| 323 | //fflush_all(); - is this needed because of NOEXEC?
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| 324 |
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| 325 | for (i = 1; argv[i]; i++) {
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| 326 | int what;
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| 327 | char *val;
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| 328 | char *arg = argv[i];
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| 329 |
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| 330 | #if ENABLE_DESKTOP
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| 331 | /* "dd --". NB: coreutils 6.9 will complain if they see
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| 332 | * more than one of them. We wouldn't. */
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| 333 | if (arg[0] == '-' && arg[1] == '-' && arg[2] == '\0')
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| 334 | continue;
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| 335 | #endif
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| 336 | val = strchr(arg, '=');
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| 337 | if (val == NULL)
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| 338 | bb_show_usage();
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| 339 | *val = '\0';
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| 340 | what = index_in_strings(keywords, arg);
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| 341 | if (what < 0)
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| 342 | bb_show_usage();
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| 343 | /* *val = '='; - to preserve ps listing? */
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| 344 | val++;
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| 345 | #if ENABLE_FEATURE_DD_IBS_OBS
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| 346 | if (what == OP_ibs) {
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| 347 | /* Must fit into positive ssize_t */
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| 348 | ibs = xatoul_range_sfx(val, 1, ((size_t)-1L)/2, cwbkMG_suffixes);
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| 349 | /*continue;*/
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| 350 | }
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| 351 | if (what == OP_obs) {
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| 352 | obs = xatoul_range_sfx(val, 1, ((size_t)-1L)/2, cwbkMG_suffixes);
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| 353 | /*continue;*/
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| 354 | }
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| 355 | if (what == OP_conv) {
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| 356 | G.flags |= parse_comma_flags(val, conv_words, "conv");
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| 357 | /*continue;*/
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| 358 | }
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| 359 | if (what == OP_iflag) {
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| 360 | G.flags |= parse_comma_flags(val, iflag_words, "iflag") << FLAG_IFLAG_SHIFT;
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| 361 | /*continue;*/
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| 362 | }
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| 363 | #endif
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| 364 | if (what == OP_bs) {
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| 365 | ibs = xatoul_range_sfx(val, 1, ((size_t)-1L)/2, cwbkMG_suffixes);
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| 366 | obs = ibs;
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| 367 | /*continue;*/
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| 368 | }
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| 369 | /* These can be large: */
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| 370 | if (what == OP_count) {
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| 371 | G.flags |= FLAG_COUNT;
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| 372 | count = XATOU_SFX(val, cwbkMG_suffixes);
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| 373 | /*continue;*/
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| 374 | }
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| 375 | if (what == OP_seek) {
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| 376 | seek = XATOU_SFX(val, cwbkMG_suffixes);
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| 377 | /*continue;*/
|
|---|
| 378 | }
|
|---|
| 379 | if (what == OP_skip) {
|
|---|
| 380 | skip = XATOU_SFX(val, cwbkMG_suffixes);
|
|---|
| 381 | /*continue;*/
|
|---|
| 382 | }
|
|---|
| 383 | if (what == OP_if) {
|
|---|
| 384 | infile = val;
|
|---|
| 385 | /*continue;*/
|
|---|
| 386 | }
|
|---|
| 387 | if (what == OP_of) {
|
|---|
| 388 | outfile = val;
|
|---|
| 389 | /*continue;*/
|
|---|
| 390 | }
|
|---|
| 391 | #if ENABLE_FEATURE_DD_STATUS
|
|---|
| 392 | if (what == OP_status) {
|
|---|
| 393 | int n;
|
|---|
| 394 | n = index_in_strings(status_words, val);
|
|---|
| 395 | if (n < 0)
|
|---|
| 396 | bb_error_msg_and_die(bb_msg_invalid_arg_to, val, "status");
|
|---|
| 397 | G.flags |= FLAG_STATUS << n;
|
|---|
| 398 | /*continue;*/
|
|---|
| 399 | }
|
|---|
| 400 | #endif
|
|---|
| 401 | } /* end of "for (argv[i])" */
|
|---|
| 402 |
|
|---|
| 403 | //XXX:FIXME for huge ibs or obs, malloc'ing them isn't the brightest idea ever
|
|---|
| 404 | ibuf = xmalloc(ibs);
|
|---|
| 405 | obuf = ibuf;
|
|---|
| 406 | #if ENABLE_FEATURE_DD_IBS_OBS
|
|---|
| 407 | if (ibs != obs) {
|
|---|
| 408 | G.flags |= FLAG_TWOBUFS;
|
|---|
| 409 | obuf = xmalloc(obs);
|
|---|
| 410 | }
|
|---|
| 411 | #endif
|
|---|
| 412 |
|
|---|
| 413 | #if ENABLE_FEATURE_DD_SIGNAL_HANDLING
|
|---|
| 414 | signal_SA_RESTART_empty_mask(SIGUSR1, dd_output_status);
|
|---|
| 415 | #endif
|
|---|
| 416 | #if ENABLE_FEATURE_DD_THIRD_STATUS_LINE
|
|---|
| 417 | G.begin_time_us = monotonic_us();
|
|---|
| 418 | #endif
|
|---|
| 419 |
|
|---|
| 420 | if (infile) {
|
|---|
| 421 | xmove_fd(xopen(infile, O_RDONLY), ifd);
|
|---|
| 422 | } else {
|
|---|
| 423 | infile = bb_msg_standard_input;
|
|---|
| 424 | }
|
|---|
| 425 | if (outfile) {
|
|---|
| 426 | int oflag = O_WRONLY | O_CREAT;
|
|---|
| 427 |
|
|---|
| 428 | if (!seek && !(G.flags & FLAG_NOTRUNC))
|
|---|
| 429 | oflag |= O_TRUNC;
|
|---|
| 430 |
|
|---|
| 431 | xmove_fd(xopen(outfile, oflag), ofd);
|
|---|
| 432 |
|
|---|
| 433 | if (seek && !(G.flags & FLAG_NOTRUNC)) {
|
|---|
| 434 | if (ftruncate(ofd, seek * obs) < 0) {
|
|---|
| 435 | struct stat st;
|
|---|
| 436 |
|
|---|
| 437 | if (fstat(ofd, &st) < 0
|
|---|
| 438 | || S_ISREG(st.st_mode)
|
|---|
| 439 | || S_ISDIR(st.st_mode)
|
|---|
| 440 | ) {
|
|---|
| 441 | goto die_outfile;
|
|---|
| 442 | }
|
|---|
| 443 | }
|
|---|
| 444 | }
|
|---|
| 445 | } else {
|
|---|
| 446 | outfile = bb_msg_standard_output;
|
|---|
| 447 | }
|
|---|
| 448 | if (skip) {
|
|---|
| 449 | size_t blocksz = (G.flags & FLAG_SKIP_BYTES) ? 1 : ibs;
|
|---|
| 450 | if (lseek(ifd, skip * blocksz, SEEK_CUR) < 0) {
|
|---|
| 451 | do {
|
|---|
| 452 | ssize_t n = safe_read(ifd, ibuf, blocksz);
|
|---|
| 453 | if (n < 0)
|
|---|
| 454 | goto die_infile;
|
|---|
| 455 | if (n == 0)
|
|---|
| 456 | break;
|
|---|
| 457 | } while (--skip != 0);
|
|---|
| 458 | }
|
|---|
| 459 | }
|
|---|
| 460 | if (seek) {
|
|---|
| 461 | if (lseek(ofd, seek * obs, SEEK_CUR) < 0)
|
|---|
| 462 | goto die_outfile;
|
|---|
| 463 | }
|
|---|
| 464 |
|
|---|
| 465 | while (!(G.flags & FLAG_COUNT) || (G.in_full + G.in_part != count)) {
|
|---|
| 466 | ssize_t n;
|
|---|
| 467 |
|
|---|
| 468 | n = safe_read(ifd, ibuf, ibs);
|
|---|
| 469 | if (n == 0)
|
|---|
| 470 | break;
|
|---|
| 471 | if (n < 0) {
|
|---|
| 472 | /* "Bad block" */
|
|---|
| 473 | if (!(G.flags & FLAG_NOERROR))
|
|---|
| 474 | goto die_infile;
|
|---|
| 475 | bb_simple_perror_msg(infile);
|
|---|
| 476 | /* GNU dd with conv=noerror skips over bad blocks */
|
|---|
| 477 | xlseek(ifd, ibs, SEEK_CUR);
|
|---|
| 478 | /* conv=noerror,sync writes NULs,
|
|---|
| 479 | * conv=noerror just ignores input bad blocks */
|
|---|
| 480 | n = 0;
|
|---|
| 481 | }
|
|---|
| 482 | if (G.flags & FLAG_SWAB) {
|
|---|
| 483 | uint16_t *p16;
|
|---|
| 484 | ssize_t n2;
|
|---|
| 485 |
|
|---|
| 486 | /* Our code allows only last read to be odd-sized */
|
|---|
| 487 | if (prev_read_size & 1)
|
|---|
| 488 | bb_error_msg_and_die("can't swab %lu byte buffer",
|
|---|
| 489 | (unsigned long)prev_read_size);
|
|---|
| 490 | prev_read_size = n;
|
|---|
| 491 |
|
|---|
| 492 | /* If n is odd, last byte is not swapped:
|
|---|
| 493 | * echo -n "qwe" | dd conv=swab
|
|---|
| 494 | * prints "wqe".
|
|---|
| 495 | */
|
|---|
| 496 | p16 = (void*) ibuf;
|
|---|
| 497 | n2 = (n >> 1);
|
|---|
| 498 | while (--n2 >= 0) {
|
|---|
| 499 | *p16 = bswap_16(*p16);
|
|---|
| 500 | p16++;
|
|---|
| 501 | }
|
|---|
| 502 | }
|
|---|
| 503 | if ((size_t)n == ibs)
|
|---|
| 504 | G.in_full++;
|
|---|
| 505 | else {
|
|---|
| 506 | G.in_part++;
|
|---|
| 507 | if (G.flags & FLAG_SYNC) {
|
|---|
| 508 | memset(ibuf + n, 0, ibs - n);
|
|---|
| 509 | n = ibs;
|
|---|
| 510 | }
|
|---|
| 511 | }
|
|---|
| 512 | if (G.flags & FLAG_TWOBUFS) {
|
|---|
| 513 | char *tmp = ibuf;
|
|---|
| 514 | while (n) {
|
|---|
| 515 | size_t d = obs - oc;
|
|---|
| 516 |
|
|---|
| 517 | if (d > (size_t)n)
|
|---|
| 518 | d = n;
|
|---|
| 519 | memcpy(obuf + oc, tmp, d);
|
|---|
| 520 | n -= d;
|
|---|
| 521 | tmp += d;
|
|---|
| 522 | oc += d;
|
|---|
| 523 | if (oc == obs) {
|
|---|
| 524 | if (write_and_stats(obuf, obs, obs, outfile))
|
|---|
| 525 | goto out_status;
|
|---|
| 526 | oc = 0;
|
|---|
| 527 | }
|
|---|
| 528 | }
|
|---|
| 529 | } else {
|
|---|
| 530 | if (write_and_stats(ibuf, n, obs, outfile))
|
|---|
| 531 | goto out_status;
|
|---|
| 532 | }
|
|---|
| 533 |
|
|---|
| 534 | if (G.flags & FLAG_FSYNC) {
|
|---|
| 535 | if (fsync(ofd) < 0)
|
|---|
| 536 | goto die_outfile;
|
|---|
| 537 | }
|
|---|
| 538 | }
|
|---|
| 539 |
|
|---|
| 540 | if (ENABLE_FEATURE_DD_IBS_OBS && oc) {
|
|---|
| 541 | if (write_and_stats(obuf, oc, obs, outfile))
|
|---|
| 542 | goto out_status;
|
|---|
| 543 | }
|
|---|
| 544 | if (close(ifd) < 0) {
|
|---|
| 545 | die_infile:
|
|---|
| 546 | bb_simple_perror_msg_and_die(infile);
|
|---|
| 547 | }
|
|---|
| 548 |
|
|---|
| 549 | if (close(ofd) < 0) {
|
|---|
| 550 | die_outfile:
|
|---|
| 551 | bb_simple_perror_msg_and_die(outfile);
|
|---|
| 552 | }
|
|---|
| 553 |
|
|---|
| 554 | exitcode = EXIT_SUCCESS;
|
|---|
| 555 | out_status:
|
|---|
| 556 | if (!ENABLE_FEATURE_DD_STATUS || !(G.flags & FLAG_STATUS_NONE))
|
|---|
| 557 | dd_output_status(0);
|
|---|
| 558 |
|
|---|
| 559 | if (ENABLE_FEATURE_CLEAN_UP) {
|
|---|
| 560 | free(obuf);
|
|---|
| 561 | if (G.flags & FLAG_TWOBUFS)
|
|---|
| 562 | free(ibuf);
|
|---|
| 563 | }
|
|---|
| 564 |
|
|---|
| 565 | return exitcode;
|
|---|
| 566 | }
|
|---|
