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Allow negative seek offsets for files that can be seeked upon. It

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makes dd(1) a more complete "filter", even if this functionality is
limited to seekable streams.
This commit is contained in:
Brian Feldman 2000-10-22 23:00:32 +00:00
parent b608e3ff66
commit 53885065b7
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=67451
2 changed files with 10 additions and 2 deletions
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4
bin/dd/args.c
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@ -428,7 +428,7 @@ get_offset(val)
quad_t num;
num = get_num(val);
if (num > QUAD_MAX || num < 0) /* XXX quad_t != off_t */
errx(1, "%s: illegal offset", oper); /* Too big/negative. */
if (num > QUAD_MAX) /* XXX can't happen && quad_t != off_t */
errx(1, "%s: illegal offset", oper); /* Too big. */
return ((off_t)num);
}

8
bin/dd/position.c
View File

@ -76,6 +76,10 @@ pos_in()
return;
}
/* Don't try to read a really weird amount (like negative). */
if (in.offset < 0)
errx(1, "%s: illegal offset", "iseek/skip");
/*
* Read the data. If a pipe, read until satisfy the number of bytes
* being skipped. No differentiation for reading complete and partial
@ -138,6 +142,10 @@ pos_out()
return;
}
/* Don't try to read a really weird amount (like negative). */
if (out.offset < 0)
errx(1, "%s: illegal offset", "oseek/seek");
/* If no read access, try using mtio. */
if (out.flags & NOREAD) {
t_op.mt_op = MTFSR;