64 lines
2.3 KiB
Diff
64 lines
2.3 KiB
Diff
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2007-07-21 Jerry DeLisle <jvdelisle@gcc.gnu.org>
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PR libgfortran/32678
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* io/transfer.c (formatted_transfer_scalar): Fix off by one error in
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calculation of pos and skips. Don't allow pending_spaces to go
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negative.
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PR fortran/32678
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* gfortran.dg/fmt_t_5.f90: New test.
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--- libgfortran/io/transfer.c (revision 126821)
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+++ libgfortran/io/transfer.c (revision 126823)
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@@ -893,9 +893,9 @@ formatted_transfer_scalar (st_parameter_
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case FMT_TR:
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consume_data_flag = 0 ;
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- pos = bytes_used + f->u.n + dtp->u.p.skips;
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- dtp->u.p.skips = f->u.n + dtp->u.p.skips;
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- dtp->u.p.pending_spaces = pos - dtp->u.p.max_pos;
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+ dtp->u.p.skips += f->u.n;
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+ pos = bytes_used + dtp->u.p.skips - 1;
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+ dtp->u.p.pending_spaces = pos - dtp->u.p.max_pos + 1;
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/* Writes occur just before the switch on f->format, above, so
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that trailing blanks are suppressed, unless we are doing a
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@@ -922,8 +922,6 @@ formatted_transfer_scalar (st_parameter_
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if (bytes_used == 0)
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{
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dtp->u.p.pending_spaces -= f->u.n;
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- dtp->u.p.pending_spaces = dtp->u.p.pending_spaces < 0 ? 0
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- : dtp->u.p.pending_spaces;
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dtp->u.p.skips -= f->u.n;
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dtp->u.p.skips = dtp->u.p.skips < 0 ? 0 : dtp->u.p.skips;
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}
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@@ -945,6 +943,8 @@ formatted_transfer_scalar (st_parameter_
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dtp->u.p.skips = dtp->u.p.skips + pos - bytes_used;
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dtp->u.p.pending_spaces = dtp->u.p.pending_spaces
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+ pos - dtp->u.p.max_pos;
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+ dtp->u.p.pending_spaces = dtp->u.p.pending_spaces < 0
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+ ? 0 : dtp->u.p.pending_spaces;
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if (dtp->u.p.skips == 0)
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break;
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--- gcc/testsuite/gfortran.dg/fmt_t_5.f90 (revision 126821)
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+++ gcc/testsuite/gfortran.dg/fmt_t_5.f90 (revision 126823)
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@@ -0,0 +1,17 @@
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+! { dg-do run }
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+! PR32678 GFortan works incorrectly when writing with FORMAT Tx
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+! Before patch, NULLs were inserted in output.
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+! Test case from reporter enhanced to detect this problem.
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+ character(25) :: output
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+ character(1) :: c
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+ output = ""
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+ open (unit=10, file="pr32678testfile", status="replace")
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+ write (10,10) '12','a','b'
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+ close (10, status="keep")
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+ open (unit=10, file="pr32678testfile")
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+ read(10,20) output(1:21)
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+ if (output(1:21).ne."ab x") call abort
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+ close (10, status="delete")
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+ 10 format (a2,t1,a1,t2,a1,t20,' x')
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+ 20 format (a21)
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+ end
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