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dd: Always move excess to beginning of buffer after read/write loops

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Otherwise, while we may have enough room for at least one input
block, we may not have enough room for an output block.
This commit is contained in:
Michael Forney 2021-04-28 01:41:26 -07:00
parent 7ef4038fb5
commit 4b76652eff
1 changed files with 3 additions and 4 deletions
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7
dd.c
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@ -222,11 +222,10 @@ main(int argc, char *argv[])
ofull++; ofull++;
opos += ret; opos += ret;
} while ((eof && ipos < opos) || (!eof && ipos - opos >= obs)); } while ((eof && ipos < opos) || (!eof && ipos - opos >= obs));
if (len - ipos < ibs) { if (opos < ipos)
memmove(buf, buf + opos, ipos - opos); memmove(buf, buf + opos, ipos - opos);
ipos -= opos; ipos -= opos;
opos = 0; opos = 0;
}
} }
summary(); summary();