102 lines
2.7 KiB
C
102 lines
2.7 KiB
C
/* String intrinsics helper functions.
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Copyright (C) 2008-2017 Free Software Foundation, Inc.
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This file is part of the GNU Fortran runtime library (libgfortran).
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Libgfortran is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public
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License as published by the Free Software Foundation; either
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version 3 of the License, or (at your option) any later version.
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Libgfortran is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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/* Unlike what the name of this file suggests, we don't actually
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implement the Fortran intrinsics here. At least, not with the
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names they have in the standard. The functions here provide all
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the support we need for the standard string intrinsics, and the
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compiler translates the actual intrinsics calls to calls to
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functions in this file. */
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#include "libgfortran.h"
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#include <string.h>
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#include <assert.h>
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/* Helper function to set parts of wide strings to a constant (usually
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spaces). */
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static gfc_char4_t *
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memset_char4 (gfc_char4_t *b, gfc_char4_t c, size_t len)
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{
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size_t i;
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for (i = 0; i < len; i++)
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b[i] = c;
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return b;
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}
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/* Compare wide character types, which are handled internally as
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unsigned 4-byte integers. */
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int
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memcmp_char4 (const void *a, const void *b, size_t len)
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{
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const GFC_UINTEGER_4 *pa = a;
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const GFC_UINTEGER_4 *pb = b;
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while (len-- > 0)
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{
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if (*pa != *pb)
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return *pa < *pb ? -1 : 1;
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pa ++;
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pb ++;
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}
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return 0;
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}
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/* All other functions are defined using a few generic macros in
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string_intrinsics_inc.c, so we avoid code duplication between the
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various character type kinds. */
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#undef CHARTYPE
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#define CHARTYPE char
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#undef UCHARTYPE
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#define UCHARTYPE unsigned char
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#undef SUFFIX
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#define SUFFIX(x) x
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#undef MEMSET
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#define MEMSET memset
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#undef MEMCMP
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#define MEMCMP memcmp
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#include "string_intrinsics_inc.c"
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#undef CHARTYPE
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#define CHARTYPE gfc_char4_t
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#undef UCHARTYPE
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#define UCHARTYPE gfc_char4_t
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#undef SUFFIX
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#define SUFFIX(x) x ## _char4
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#undef MEMSET
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#define MEMSET memset_char4
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#undef MEMCMP
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#define MEMCMP memcmp_char4
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#include "string_intrinsics_inc.c"
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