| [9] | 1 | /* dd - disk dumper */
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| 2 |
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| 3 | #include <sys/types.h>
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| 4 | #include <sys/stat.h>
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| 5 | #include <signal.h>
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| 6 | #include <fcntl.h>
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| 7 | #include <unistd.h>
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| 8 | #include <stdlib.h>
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| 9 | #include <unistd.h>
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| 10 | #include <stdio.h>
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| 11 | #include <string.h>
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| 12 | #include <errno.h>
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| 13 |
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| 14 | #define EOS '\0'
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| 15 | #define BOOLEAN int
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| 16 | #define TRUE 1
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| 17 | #define FALSE 0
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| 18 |
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| 19 | char *pch, *errorp;
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| 20 |
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| 21 | _PROTOTYPE(int main, (int argc, char **argv));
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| 22 | _PROTOTYPE(BOOLEAN is, (char *pc));
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| 23 | _PROTOTYPE(int num, (void));
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| 24 | _PROTOTYPE(void puto, (void));
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| 25 | _PROTOTYPE(void statistics, (void));
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| 26 | _PROTOTYPE(int ulcase, (int c));
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| 27 | _PROTOTYPE(void cnull, (int c));
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| 28 | _PROTOTYPE(void null, (int c));
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| 29 | _PROTOTYPE(void extra, (void));
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| 30 | _PROTOTYPE(void over, (int dummy));
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| 31 |
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| 32 | BOOLEAN is(pc)
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| 33 | char *pc;
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| 34 | {
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| 35 | register char *ps = pch;
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| 36 |
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| 37 | while (*ps++ == *pc++)
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| 38 | if (*pc == EOS) {
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| 39 | pch = ps;
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| 40 | return(TRUE);
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| 41 | }
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| 42 | return(FALSE);
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| 43 | }
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| 44 |
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| 45 | #define BIGNUM 2147483647
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| 46 |
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| 47 | int num()
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| 48 | {
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| 49 | long ans;
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| 50 | register char *pc;
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| 51 |
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| 52 | pc = pch;
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| 53 | ans = 0L;
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| 54 | while ((*pc >= '0') && (*pc <= '9'))
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| 55 | ans = (long) ((*pc++ - '0') + (ans * 10));
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| 56 | while (TRUE) switch (*pc++) {
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| 57 | case 'w':
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| 58 | ans *= 2L;
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| 59 | continue;
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| 60 | case 'b':
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| 61 | ans *= 512L;
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| 62 | continue;
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| 63 | case 'k':
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| 64 | ans *= 1024L;
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| 65 | continue;
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| 66 | case 'x':
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| 67 | pch = pc;
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| 68 | ans *= (long) num();
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| 69 | case EOS:
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| 70 | if ((ans >= BIGNUM) || (ans < 0)) {
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| 71 | fprintf(stderr, "dd: argument %s out of range\n",
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| 72 | errorp);
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| 73 | exit(1);
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| 74 | }
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| 75 | return((int) ans);
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| 76 | }
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| 77 | }
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| 78 |
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| 79 | #define SWAB 0x0001
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| 80 | #define LCASE 0x0002
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| 81 | #define UCASE 0x0004
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| 82 | #define NOERROR 0x0008
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| 83 | #define SYNC 0x0010
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| 84 | #define SILENT 0x0020
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| 85 | #define BLANK ' '
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| 86 | #define DEFAULT 512
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| 87 |
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| 88 | unsigned cbs, bs, skip, nseek, count;
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| 89 | int seekseen = FALSE;
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| 90 | unsigned ibs = DEFAULT;
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| 91 | unsigned obs = DEFAULT;
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| 92 | unsigned files = 1;
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| 93 | char *ifilename = NULL;
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| 94 | char *ofilename = NULL;
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| 95 |
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| 96 | int convflag = 0;
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| 97 | int flag = 0;
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| 98 | int ifd, ofd, ibc;
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| 99 | char *ibuf, *obuf, *op;
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| 100 | unsigned nifull, nipartial, nofull, nopartial;
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| 101 | int cbc;
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| 102 | unsigned ntr, obc;
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| 103 | int ns;
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| 104 | char mlen[] = {64, 45, 82, 45, 83, 96, 109, 100, 109, 97, 96, 116, 108, 9};
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| 105 |
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| 106 | void puto()
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| 107 | {
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| 108 | int n;
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| 109 |
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| 110 | if (obc == 0) return;
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| 111 | if (obc == obs)
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| 112 | nofull++;
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| 113 | else
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| 114 | nopartial++;
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| 115 | if ((n = write(ofd, obuf, obc)) != obc) {
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| 116 | if (n == -1) {
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| 117 | fprintf(stderr, "dd: Write error: %s\n", strerror(errno));
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| 118 | } else {
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| 119 | fprintf(stderr, "dd: Short write, %d instead of %d\n", n, obc);
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| 120 | }
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| 121 | exit(1);
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| 122 | }
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| 123 | obc = 0;
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| 124 | }
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| 125 |
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| 126 | void statistics()
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| 127 | {
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| 128 | if (convflag & SILENT) return;
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| 129 | fprintf(stderr, "%u+%u records in\n", nifull, nipartial);
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| 130 | fprintf(stderr, "%u+%u records out\n", nofull, nopartial);
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| 131 | if (ntr) fprintf(stderr, "%d truncated records\n", ntr);
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| 132 | }
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| 133 |
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| 134 |
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| 135 | int main(argc, argv)
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| 136 | int argc;
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| 137 | char *argv[];
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| 138 | {
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| 139 | #ifdef __STDC__
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| 140 | void (*convert) (int);
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| 141 | #else
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| 142 | void (*convert) ();
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| 143 | #endif
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| 144 | char *iptr;
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| 145 | int i, j;
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| 146 |
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| 147 | convert = null;
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| 148 | argc--;
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| 149 | argv++;
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| 150 | while (argc-- > 0) {
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| 151 | pch = *(argv++);
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| 152 | if (is("ibs=")) {
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| 153 | errorp = pch;
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| 154 | ibs = num();
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| 155 | continue;
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| 156 | }
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| 157 | if (is("obs=")) {
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| 158 | errorp = pch;
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| 159 | obs = num();
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| 160 | continue;
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| 161 | }
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| 162 | if (is("bs=")) {
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| 163 | errorp = pch;
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| 164 | bs = num();
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| 165 | continue;
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| 166 | }
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| 167 | if (is("if=")) {
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| 168 | ifilename = pch;
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| 169 | continue;
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| 170 | }
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| 171 | if (is("of=")) {
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| 172 | ofilename = pch;
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| 173 | continue;
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| 174 | }
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| 175 | if (is("skip=")) {
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| 176 | errorp = pch;
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| 177 | skip = num();
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| 178 | continue;
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| 179 | }
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| 180 | if (is("seek=")) {
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| 181 | errorp = pch;
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| 182 | nseek = num();
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| 183 | seekseen = TRUE;
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| 184 | continue;
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| 185 | }
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| 186 | if (is("count=")) {
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| 187 | errorp = pch;
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| 188 | count = num();
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| 189 | continue;
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| 190 | }
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| 191 | if (is("files=")) {
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| 192 | errorp = pch;
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| 193 | files = num();
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| 194 | continue;
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| 195 | }
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| 196 | if (is("length=")) {
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| 197 | errorp = pch;
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| 198 | for (j = 0; j < 13; j++) mlen[j]++;
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| 199 | write(2, mlen, 14);
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| 200 | continue;
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| 201 | }
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| 202 | if (is("conv=")) {
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| 203 | while (*pch != EOS) {
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| 204 | if (is("lcase")) {
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| 205 | convflag |= LCASE;
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| 206 | continue;
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| 207 | }
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| 208 | if (is("ucase")) {
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| 209 | convflag |= UCASE;
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| 210 | continue;
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| 211 | }
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| 212 | if (is("noerror")) {
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| 213 | convflag |= NOERROR;
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| 214 | continue;
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| 215 | }
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| 216 | if (is("sync")) {
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| 217 | convflag |= SYNC;
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| 218 | continue;
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| 219 | }
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| 220 | if (is("swab")) {
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| 221 | convflag |= SWAB;
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| 222 | continue;
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| 223 | }
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| 224 | if (is("silent")) {
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| 225 | convflag |= SILENT;
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| 226 | continue;
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| 227 | }
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| 228 | if (is(",")) continue;
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| 229 | fprintf(stderr, "dd: bad argument: %s\n",
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| 230 | pch);
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| 231 | exit(1);
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| 232 | }
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| 233 | if (*pch == EOS) continue;
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| 234 | }
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| 235 | fprintf(stderr, "dd: bad argument: %s\n", pch);
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| 236 | exit(1);
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| 237 | }
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| 238 | if ((convert == null) && (convflag & (UCASE | LCASE))) convert = cnull;
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| 239 | if ((ifd = ((ifilename) ? open(ifilename, O_RDONLY) : dup(0))) < 0) {
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| 240 | fprintf(stderr, "dd: Can't open %s: %s\n",
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| 241 | (ifilename) ? ifilename : "stdin", strerror(errno));
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| 242 | exit(1);
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| 243 | }
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| 244 | if ((ofd = ((ofilename) ? open(ofilename, seekseen ? O_WRONLY | O_CREAT
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| 245 | : O_WRONLY | O_CREAT | O_TRUNC, 0666)
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| 246 | : dup(1))) < 0) {
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| 247 | fprintf(stderr, "dd: Can't open %s: %s\n",
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| 248 | (ofilename) ? ofilename : "stdout", strerror(errno));
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| 249 | exit(1);
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| 250 | }
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| 251 | if (bs) {
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| 252 | ibs = obs = bs;
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| 253 | if (convert == null) flag++;
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| 254 | }
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| 255 | if (ibs == 0) {
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| 256 | fprintf(stderr, "dd: ibs cannot be zero\n");
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| 257 | exit(1);
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| 258 | }
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| 259 | if (obs == 0) {
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| 260 | fprintf(stderr, "dd: obs cannot be zero\n");
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| 261 | exit(1);
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| 262 | }
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| 263 | if ((ibuf = sbrk(ibs)) == (char *) -1) {
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| 264 | fprintf(stderr, "dd: not enough memory\n");
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| 265 | exit(1);
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| 266 | }
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| 267 | if ((obuf = (flag) ? ibuf : sbrk(obs)) == (char *) -1) {
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| 268 | fprintf(stderr, "dd: not enough memory\n");
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| 269 | exit(1);
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| 270 | }
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| 271 | ibc = obc = cbc = 0;
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| 272 | op = obuf;
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| 273 | if (signal(SIGINT, SIG_IGN) != SIG_IGN) signal(SIGINT, over);
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| 274 | if (skip != 0) {
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| 275 | struct stat st;
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| 276 | if (fstat(ifd,&st) < 0 || !(S_ISREG(st.st_mode) || S_ISBLK(st.st_mode))
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| 277 | || lseek(ifd, (off_t) ibs * (off_t) skip, SEEK_SET) == (off_t) -1) {
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| 278 | do {
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| 279 | if (read(ifd, ibuf, ibs) == -1) {
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| 280 | fprintf(stderr,
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| 281 | "dd: Error skipping input: %s\n",
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| 282 | strerror(errno));
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| 283 | exit(1);
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| 284 | }
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| 285 | } while (--skip != 0);
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| 286 | }
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| 287 | }
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| 288 | if (nseek != 0) {
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| 289 | if (lseek(ofd, (off_t) obs * (off_t) nseek, SEEK_SET) == (off_t) -1) {
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| 290 | fprintf(stderr, "dd: Seeking on output failed: %s\n",
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| 291 | strerror(errno));
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| 292 | exit(1);
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| 293 | }
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| 294 | }
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| 295 |
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| 296 | outputall:
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| 297 | if (ibc-- == 0) {
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| 298 | ibc = 0;
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| 299 | if ((count == 0) || ((nifull + nipartial) != count)) {
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| 300 | if (convflag & (NOERROR | SYNC))
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| 301 | for (iptr = ibuf + ibs; iptr > ibuf;) *--iptr = 0;
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| 302 | ibc = read(ifd, ibuf, ibs);
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| 303 | }
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| 304 | if (ibc == -1) {
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| 305 | fprintf(stderr, "dd: Read error: %s\n", strerror(errno));
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| 306 | if ((convflag & NOERROR) == 0) {
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| 307 | puto();
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| 308 | over(0);
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| 309 | }
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| 310 | ibc = 0;
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| 311 | for (i = 0; i < ibs; i++)
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| 312 | if (ibuf[i] != 0) ibc = i;
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| 313 | statistics();
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| 314 | }
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| 315 | if ((ibc == 0) && (--files <= 0)) {
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| 316 | puto();
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| 317 | over(0);
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| 318 | }
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| 319 | if (ibc != ibs) {
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| 320 | nipartial++;
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| 321 | if (convflag & SYNC) ibc = ibs;
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| 322 | } else
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| 323 | nifull++;
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| 324 | iptr = ibuf;
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| 325 | i = ibc >> 1;
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| 326 | if ((convflag & SWAB) && i) do {
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| 327 | int temp;
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| 328 | temp = *iptr++;
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| 329 | iptr[-1] = *iptr;
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| 330 | *iptr++ = temp;
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| 331 | } while (--i);
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| 332 | iptr = ibuf;
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| 333 | if (flag) {
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| 334 | obc = ibc;
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| 335 | puto();
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| 336 | ibc = 0;
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| 337 | }
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| 338 | goto outputall;
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| 339 | }
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| 340 | i = *iptr++ & 0377;
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| 341 | (*convert) (i);
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| 342 | goto outputall;
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| 343 | }
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| 344 |
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| 345 | int ulcase(c)
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| 346 | int c;
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| 347 | {
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| 348 | int ans = c;
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| 349 |
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| 350 | if ((convflag & UCASE) && (c >= 'a') &&
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| 351 | (c <= 'z'))
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| 352 | ans += 'A' - 'a';
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| 353 | if ((convflag & LCASE) && (c >= 'A') &&
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| 354 | (c <= 'Z'))
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| 355 | ans += 'a' - 'A';
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| 356 | return(ans);
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| 357 | }
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| 358 |
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| 359 | void cnull(c)
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| 360 | int c;
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| 361 | {
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| 362 | c = ulcase(c);
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| 363 | null(c);
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| 364 | }
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| 365 |
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| 366 | void null(c)
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| 367 | int c;
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| 368 | {
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| 369 | *op++ = c;
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| 370 | if (++obc >= obs) {
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| 371 | puto();
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| 372 | op = obuf;
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| 373 | }
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| 374 | }
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| 375 |
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| 376 | void extra()
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| 377 | {
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| 378 | if (++cbc >= cbs) {
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| 379 | null('\n');
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| 380 | cbc = 0;
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| 381 | ns = 0;
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| 382 | }
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| 383 | }
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| 384 |
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| 385 | void over(sig)
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| 386 | int sig;
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| 387 | {
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| 388 | statistics();
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| 389 | if (sig != 0) {
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| 390 | signal(sig, SIG_DFL);
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| 391 | raise(sig);
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| 392 | }
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| 393 | exit(0);
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| 394 | }
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