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* [gcc r14-8983] Fortran: Implement read_x for UTF-8 encoded files.
@ 2024-02-14 15:58 Jerry DeLisle
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From: Jerry DeLisle @ 2024-02-14 15:58 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:b79d3e6a9284703b70688122f7d4955e7c50804a
commit r14-8983-gb79d3e6a9284703b70688122f7d4955e7c50804a
Author: Jerry DeLisle <jvdelisle@gcc.gnu.org>
Date: Tue Feb 13 14:32:21 2024 -0800
Fortran: Implement read_x for UTF-8 encoded files.
PR fortran/99210
libgfortran/ChangeLog:
* io/read.c (read_x): If UTF-8 encoding is enabled, use
read_utf8 to move one character over in the read buffer.
gcc/testsuite/ChangeLog:
* gfortran.dg/pr99210.f90: New test.
Diff:
---
gcc/testsuite/gfortran.dg/pr99210.f90 | 29 +++++++++++++++++++++++++++++
libgfortran/io/read.c | 17 +++++++++++++++++
2 files changed, 46 insertions(+)
diff --git a/gcc/testsuite/gfortran.dg/pr99210.f90 b/gcc/testsuite/gfortran.dg/pr99210.f90
new file mode 100644
index 000000000000..9fd2fb468df0
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/pr99210.f90
@@ -0,0 +1,29 @@
+! { dg-do run }
+! PR99210 X editing for reading file with encoding='utf-8'
+program test_bug_format_x
+ use iso_fortran_env
+ integer, parameter :: u = selected_char_kind('ISO_10646')
+
+ character(kind=u, len=1) a, b, a1, b1, b2
+
+ open(unit=10, file='test_bug_format_x.tmp', encoding='UTF-8')
+
+ a = char(int(z'03B1'), u)
+ b = char(int(z'03B2'), u)
+ write(10, '(a1, a1)') a, b
+
+ rewind(10)
+ read(10, '(a1, a1)') a1, b1
+
+ rewind(10)
+ read(10, '(1x, a1)') b2
+
+ close (10, status="delete")
+ if(a /= a1 .or. b /= b1) then
+ error stop 1
+ end if
+
+ if(b /= b2) then
+ error stop 2
+ end if
+end program test_bug_format_x
diff --git a/libgfortran/io/read.c b/libgfortran/io/read.c
index 0ffcf76fd387..e2d2f8be8065 100644
--- a/libgfortran/io/read.c
+++ b/libgfortran/io/read.c
@@ -1307,6 +1307,23 @@ read_x (st_parameter_dt *dtp, size_t n)
if (n == 0)
return;
+
+ if (dtp->u.p.current_unit->flags.encoding == ENCODING_UTF8)
+ {
+ gfc_char4_t c;
+ size_t nbytes, j;
+
+ /* Proceed with decoding one character at a time. */
+ for (j = 0; j < n; j++)
+ {
+ c = read_utf8 (dtp, &nbytes);
+
+ /* Check for a short read and if so, break out. */
+ if (nbytes == 0 || c == (gfc_char4_t)0)
+ break;
+ }
+ return;
+ }
length = n;
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