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authorEric Andersen <andersen@codepoet.org>2000-11-29 22:33:02 +0000
committerEric Andersen <andersen@codepoet.org>2000-11-29 22:33:02 +0000
commitddea368dbe50bd9bb3ca129037aa4ca1e28515ed (patch)
tree335749b651c96092554e01b9912d14680533bac2 /coreutils
parent618e8ed4c4bdb27875abdd725ddf342c5de19ac2 (diff)
downloadbusybox-ddea368dbe50bd9bb3ca129037aa4ca1e28515ed.tar.gz
Apply rev #2 of dd fix from Gennady Feldman.
Diffstat (limited to 'coreutils')
-rw-r--r--coreutils/dd.c28
1 files changed, 21 insertions, 7 deletions
diff --git a/coreutils/dd.c b/coreutils/dd.c
index 6868a913e..2b77ea6a5 100644
--- a/coreutils/dd.c
+++ b/coreutils/dd.c
@@ -49,14 +49,15 @@ extern int dd_main(int argc, char **argv)
int inCc = 0;
int outCc;
int trunc=TRUE;
- long blockSize = 512;
+ int sync=FALSE;
+ long blockSize = 512,ibs;
uintmax_t skipBlocks = 0;
uintmax_t seekBlocks = 0;
uintmax_t count = (uintmax_t) - 1;
uintmax_t inTotal = 0;
uintmax_t outTotal = 0;
uintmax_t totalSize;
- uintmax_t readSize;
+
unsigned char buf[BUFSIZ];
char *keyword = NULL;
@@ -98,6 +99,8 @@ extern int dd_main(int argc, char **argv)
keyword = (strchr(*argv, '=') + 1);
if (strcmp(keyword, "notrunc") == 0)
trunc=FALSE;
+ if (strcmp(keyword, "sync") == 0)
+ sync=TRUE;
} else {
goto usage;
}
@@ -137,13 +140,24 @@ extern int dd_main(int argc, char **argv)
lseek(inFd, (off_t) (skipBlocks * blockSize), SEEK_SET);
lseek(outFd, (off_t) (seekBlocks * blockSize), SEEK_SET);
totalSize=count*blockSize;
- while ((readSize = totalSize - inTotal) > 0) {
- if (readSize > BUFSIZ)
- readSize=BUFSIZ;
- inCc = fullRead(inFd, buf, readSize);
+
+ ibs=blockSize;
+ if (ibs > BUFSIZ)
+ ibs=BUFSIZ;
+
+ while (totalSize > outTotal) {
+ inCc = fullRead(inFd, buf, ibs);
inTotal += inCc;
- if ((outCc = fullWrite(outFd, buf, inCc)) < 1)
+ if ( (sync==TRUE) && (inCc>0) )
+ while (inCc<ibs)
+ buf[inCc++]='\0';
+
+ if ((outCc = fullWrite(outFd, buf, inCc)) < 1){
+ if (outCc < 0 ){
+ perror("Error during write");
+ }
break;
+ }
outTotal += outCc;
}
if (trunc == TRUE) {