1 /* String intrinsics helper functions. 2 Copyright (C) 2008-2019 Free Software Foundation, Inc. 3 4 This file is part of the GNU Fortran runtime library (libgfortran). 5 6 Libgfortran is free software; you can redistribute it and/or 7 modify it under the terms of the GNU General Public 8 License as published by the Free Software Foundation; either 9 version 3 of the License, or (at your option) any later version. 10 11 Libgfortran is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 GNU General Public License for more details. 15 16 Under Section 7 of GPL version 3, you are granted additional 17 permissions described in the GCC Runtime Library Exception, version 18 3.1, as published by the Free Software Foundation. 19 20 You should have received a copy of the GNU General Public License and 21 a copy of the GCC Runtime Library Exception along with this program; 22 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23 <http://www.gnu.org/licenses/>. */ 24 25 26 /* Unlike what the name of this file suggests, we don't actually 27 implement the Fortran intrinsics here. At least, not with the 28 names they have in the standard. The functions here provide all 29 the support we need for the standard string intrinsics, and the 30 compiler translates the actual intrinsics calls to calls to 31 functions in this file. */ 32 33 #include "libgfortran.h" 34 35 #include <string.h> 36 #include <assert.h> 37 38 39 /* Helper function to set parts of wide strings to a constant (usually 40 spaces). */ 41 42 static gfc_char4_t * 43 memset_char4 (gfc_char4_t *b, gfc_char4_t c, size_t len) 44 { 45 size_t i; 46 47 for (i = 0; i < len; i++) 48 b[i] = c; 49 50 return b; 51 } 52 53 /* Compare wide character types, which are handled internally as 54 unsigned 4-byte integers. */ 55 int 56 memcmp_char4 (const void *a, const void *b, size_t len) 57 { 58 const GFC_UINTEGER_4 *pa = a; 59 const GFC_UINTEGER_4 *pb = b; 60 while (len-- > 0) 61 { 62 if (*pa != *pb) 63 return *pa < *pb ? -1 : 1; 64 pa ++; 65 pb ++; 66 } 67 return 0; 68 } 69 70 71 /* All other functions are defined using a few generic macros in 72 string_intrinsics_inc.c, so we avoid code duplication between the 73 various character type kinds. */ 74 75 #undef CHARTYPE 76 #define CHARTYPE char 77 #undef UCHARTYPE 78 #define UCHARTYPE unsigned char 79 #undef SUFFIX 80 #define SUFFIX(x) x 81 #undef MEMSET 82 #define MEMSET memset 83 #undef MEMCMP 84 #define MEMCMP memcmp 85 86 #include "string_intrinsics_inc.c" 87 88 89 #undef CHARTYPE 90 #define CHARTYPE gfc_char4_t 91 #undef UCHARTYPE 92 #define UCHARTYPE gfc_char4_t 93 #undef SUFFIX 94 #define SUFFIX(x) x ## _char4 95 #undef MEMSET 96 #define MEMSET memset_char4 97 #undef MEMCMP 98 #define MEMCMP memcmp_char4 99 100 #include "string_intrinsics_inc.c" 101 102