1 /* Native functions for string operations. 2 3 Copyright (C) 2016 Paul Boddie <paul@boddie.org.uk> 4 5 This program is free software; you can redistribute it and/or modify it under 6 the terms of the GNU General Public License as published by the Free Software 7 Foundation; either version 3 of the License, or (at your option) any later 8 version. 9 10 This program is distributed in the hope that it will be useful, but WITHOUT 11 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 12 FOR A PARTICULAR PURPOSE. See the GNU General Public License for more 13 details. 14 15 You should have received a copy of the GNU General Public License along with 16 this program. If not, see <http://www.gnu.org/licenses/>. 17 */ 18 19 #include <string.h> /* strcmp, memcpy */ 20 #include "native/common.h" 21 #include "types.h" 22 #include "exceptions.h" 23 #include "ops.h" 24 #include "progconsts.h" 25 #include "progops.h" 26 #include "progtypes.h" 27 #include "main.h" 28 29 /* String operations. */ 30 31 __attr __fn_native_str_str_add(__attr __args[]) 32 { 33 __attr * const _data = &__args[1]; 34 __attr * const other = &__args[2]; 35 /* _data, other interpreted as string */ 36 char *s = _data->strvalue; 37 char *o = other->strvalue; 38 int n = _data->size + other->size; 39 char *r = (char *) __ALLOCATE(n + 1, sizeof(char)); 40 41 memcpy(r, s, _data->size); 42 memcpy(r + _data->size, o, other->size); 43 44 /* Return a new string. */ 45 return __new_str(r, n); 46 } 47 48 __attr __fn_native_str_str_lt(__attr __args[]) 49 { 50 __attr * const _data = &__args[1]; 51 __attr * const other = &__args[2]; 52 /* _data, other interpreted as string */ 53 char *s = _data->strvalue; 54 char *o = other->strvalue; 55 56 /* NOTE: Using simple byte-level string operations. */ 57 return strcmp(s, o) < 0 ? __builtins___boolean_True : __builtins___boolean_False; 58 } 59 60 __attr __fn_native_str_str_gt(__attr __args[]) 61 { 62 __attr * const _data = &__args[1]; 63 __attr * const other = &__args[2]; 64 /* _data, other interpreted as string */ 65 char *s = _data->strvalue; 66 char *o = other->strvalue; 67 68 /* NOTE: Using simple byte-level string operations. */ 69 return strcmp(s, o) > 0 ? __builtins___boolean_True : __builtins___boolean_False; 70 } 71 72 __attr __fn_native_str_str_eq(__attr __args[]) 73 { 74 __attr * const _data = &__args[1]; 75 __attr * const other = &__args[2]; 76 /* _data, other interpreted as string */ 77 char *s = _data->strvalue; 78 char *o = other->strvalue; 79 80 /* NOTE: Using simple byte-level string operations. */ 81 return strcmp(s, o) == 0 ? __builtins___boolean_True : __builtins___boolean_False; 82 } 83 84 __attr __fn_native_str_str_len(__attr __args[]) 85 { 86 __attr * const _data = &__args[1]; 87 88 /* Return the new integer. */ 89 return __new_int(_data->size); 90 } 91 92 __attr __fn_native_str_str_nonempty(__attr __args[]) 93 { 94 __attr * const _data = &__args[1]; 95 96 return _data->size ? __builtins___boolean_True : __builtins___boolean_False; 97 } 98 99 __attr __fn_native_str_str_ord(__attr __args[]) 100 { 101 __attr * const _data = &__args[1]; 102 /* _data interpreted as string */ 103 char *s = _data->strvalue; 104 105 return __new_int((unsigned int) s[0]); 106 } 107 108 __attr __fn_native_str_str_substr(__attr __args[]) 109 { 110 __attr * const _data = &__args[1]; 111 __attr * const start = &__args[2]; 112 __attr * const end = &__args[3]; 113 __attr * const step = &__args[4]; 114 /* _data interpreted as string */ 115 char *s = _data->strvalue, *sub; 116 /* start.__data__ interpreted as int */ 117 int istart = __load_via_object(start->value, __pos___data__).intvalue; 118 /* end.__data__ interpreted as int */ 119 int iend = __load_via_object(end->value, __pos___data__).intvalue; 120 /* step.__data__ interpreted as int */ 121 int istep = __load_via_object(step->value, __pos___data__).intvalue; 122 123 /* Calculate the size of the substring. */ 124 size_t resultsize = ((iend - istart - (istep > 0 ? 1 : -1)) / istep) + 1; 125 int to, from; 126 127 /* Reserve space for a new string. */ 128 sub = (char *) __ALLOCATE(resultsize + 1, sizeof(char)); 129 130 /* Does not null terminate but final byte should be zero. */ 131 if (istep > 0) 132 for (from = istart, to = 0; from < iend; from += istep, to++) 133 sub[to] = s[from]; 134 else if (istep < 0) 135 for (from = istart, to = 0; from > iend; from += istep, to++) 136 sub[to] = s[from]; 137 138 return __new_str(sub, resultsize); 139 } 140 141 /* Module initialisation. */ 142 143 void __main_native_str() 144 { 145 }