[gcc(refs/users/mikael/heads/refactor_descriptor_v05)] Correction régression arrayio_16

[Mikael Morin]

https://gcc.gnu.org/g:23de2e883600d01fbfbbe82407c470be55cfe0f5

commit 23de2e883600d01fbfbbe82407c470be55cfe0f5
Author: Mikael Morin <mikael@gcc.gnu.org>
Date:   Thu Apr 24 13:30:07 2025 +0200

    Correction régression arrayio_16

Diff:
---
 gcc/fortran/libgfortran.h   |  1 +
 libgfortran/io/list_read.c  | 12 ++++++++++++
 libgfortran/io/unix.c       |  2 +-
 libgfortran/runtime/error.c |  4 ++++
 4 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/gcc/fortran/libgfortran.h b/gcc/fortran/libgfortran.h
index 9de5afb6c83e..b592c1477879 100644
--- a/gcc/fortran/libgfortran.h
+++ b/gcc/fortran/libgfortran.h
@@ -143,6 +143,7 @@ typedef enum
   LIBERROR_INQUIRE_INTERNAL_UNIT, /* Must be different from STAT_STOPPED_IMAGE.  */
   LIBERROR_BAD_WAIT_ID,
   LIBERROR_NO_MEMORY,
+  LIBERROR_MISALIGNED_INTERNAL_UNIT,
   LIBERROR_LAST			/* Not a real error, the last error # + 1.  */
 }
 libgfortran_error_codes;
diff --git a/libgfortran/io/list_read.c b/libgfortran/io/list_read.c
index 21a935bc4c4d..a8658c61b5df 100644
--- a/libgfortran/io/list_read.c
+++ b/libgfortran/io/list_read.c
@@ -251,6 +251,18 @@ next_char_internal (st_parameter_dt *dtp)
 	      goto done;
 	    }
 
+	  if (unlikely (is_char4_unit(dtp)))
+	    {
+	      if (unlikely (record % sizeof (gfc_char4_t) != 0))
+		{
+		  generate_error (&dtp->common,
+				  LIBERROR_MISALIGNED_INTERNAL_UNIT, NULL);
+		  return '\0';
+		}
+	      else
+		record /= sizeof (gfc_char4_t);
+	    }
+
 	  if (sseek (dtp->u.p.current_unit->s, record, SEEK_SET) < 0)
 	    return EOF;
 
diff --git a/libgfortran/io/unix.c b/libgfortran/io/unix.c
index 129e2dbf0916..68afb0ad627c 100644
--- a/libgfortran/io/unix.c
+++ b/libgfortran/io/unix.c
@@ -1098,7 +1098,7 @@ open_internal4 (char *base, size_t length, gfc_offset offset)
   s->buffer = base;
   s->buffer_offset = offset;
 
-  s->active = s->file_length = length * sizeof (gfc_char4_t);
+  s->active = s->file_length = length;
 
   s->st.vptr = &mem4_vtable;
 
diff --git a/libgfortran/runtime/error.c b/libgfortran/runtime/error.c
index d2ae7be16f41..444bb38bcdb5 100644
--- a/libgfortran/runtime/error.c
+++ b/libgfortran/runtime/error.c
@@ -633,6 +633,10 @@ translate_error (int code)
       p = "Bad ID in WAIT statement";
       break;
 
+    case LIBERROR_MISALIGNED_INTERNAL_UNIT:
+      p = "Misaligned offset reading internal file";
+      break;
+
     default:
       p = "Unknown error code";
       break;