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LP20 emulation was overwriting existing files

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When an LP20 is attached to an existing file, the file is opened in
update mode.  Since the initial file position is zero, any existing
output is over-written.  This is not intuitive.

This edit makes the LP20 seek to EOF on attach.

N.B. Other devices may have cousin issues.
This commit is contained in:
Timothe Litt 2013-05-29 13:43:12 -04:00
parent 27dac1ade2
commit f5de2f4d22
1 changed files with 6 additions and 0 deletions
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6
PDP10/pdp10_lp20.c
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@ -25,6 +25,8 @@
lp20 line printer
29-May-13 TL Force append when an existing file is attached. Previously
over-wrote file from the top.
19-Jan-07 RMS Added UNIT_TEXT flag
04-Sep-05 RMS Fixed missing return (found by Peter Schorn)
07-Jul-05 RMS Removed extraneous externs
@ -657,6 +659,10 @@ t_stat lp20_attach (UNIT *uptr, char *cptr)
t_stat reason;
reason = attach_unit (uptr, cptr); /* attach file */
if (reason == SCPE_OK) {
sim_fseek (uptr->fileref, 0, SEEK_END);
uptr->pos = ftell (uptr->fileref);
}
if (lpcsa & CSA_ONL) /* just file chg? */
return reason;
if (sim_is_active (&lp20_unit)) /* busy? no int */