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/* String intrinsics helper functions.
Copyright (C) 2008-2024 Free Software Foundation, Inc.
This file is part of the GNU Fortran runtime library (libgfortran).
Libgfortran is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public
License as published by the Free Software Foundation; either
version 3 of the License, or (at your option) any later version.
Libgfortran is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
GNU General Public License for more details.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<>. */
/* Unlike what the name of this file suggests, we don't actually
implement the Fortran intrinsics here. At least, not with the
names they have in the standard. The functions here provide all
the support we need for the standard string intrinsics, and the
compiler translates the actual intrinsics calls to calls to
functions in this file. */
#include "libgfortran.h"
#include <string.h>
#include <assert.h>
/* Helper function to set parts of wide strings to a constant (usually
spaces). */
static gfc_char4_t *
memset_char4 (gfc_char4_t *b, gfc_char4_t c, size_t len)
size_t i;
for (i = 0; i < len; i++)
b[i] = c;
return b;
/* Compare wide character types, which are handled internally as
unsigned 4-byte integers. */
memcmp_char4 (const void *a, const void *b, size_t len)
const GFC_UINTEGER_4 *pa = a;
const GFC_UINTEGER_4 *pb = b;
while (len-- > 0)
if (*pa != *pb)
return *pa < *pb ? -1 : 1;
pa ++;
pb ++;
return 0;
/* All other functions are defined using a few generic macros in
string_intrinsics_inc.c, so we avoid code duplication between the
various character type kinds. */
#define CHARTYPE char
#define UCHARTYPE unsigned char
#undef SUFFIX
#define SUFFIX(x) x
#undef MEMSET
#define MEMSET memset
#undef MEMCMP
#define MEMCMP memcmp
#include "string_intrinsics_inc.c"
#define CHARTYPE gfc_char4_t
#define UCHARTYPE gfc_char4_t
#undef SUFFIX
#define SUFFIX(x) x ## _char4
#undef MEMSET
#define MEMSET memset_char4
#undef MEMCMP
#define MEMCMP memcmp_char4
#include "string_intrinsics_inc.c"