1 /* Native functions for string operations. 2 3 Copyright (C) 2016, 2017 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 size_t ss = strlen(_data->strvalue), os = strlen(other->strvalue); 39 int n = ss + os; 40 char *r = (char *) __ALLOCATE(n + 1, sizeof(char)); 41 42 memcpy(r, s, ss); 43 memcpy(r + ss, o, os); 44 45 /* Return a new string. */ 46 return __new_str(r); 47 } 48 49 __attr __fn_native_str_str_chr(__attr __args[]) 50 { 51 __attr * const _data = &__args[1]; 52 /* _data interpreted as int */ 53 int n = _data->intvalue; 54 char *s = (char *) __ALLOCATE(2, sizeof(char)); 55 56 s[0] = (char) n; 57 return __new_str(s); 58 } 59 60 __attr __fn_native_str_str_lt(__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_gt(__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_eq(__attr __args[]) 85 { 86 __attr * const _data = &__args[1]; 87 __attr * const other = &__args[2]; 88 /* _data, other interpreted as string */ 89 char *s = _data->strvalue; 90 char *o = other->strvalue; 91 92 /* NOTE: Using simple byte-level string operations. */ 93 return strcmp(s, o) == 0 ? __builtins___boolean_True : __builtins___boolean_False; 94 } 95 96 __attr __fn_native_str_str_len(__attr __args[]) 97 { 98 __attr * const _data = &__args[1]; 99 100 /* Return the new integer. */ 101 return __new_int(strlen(_data->strvalue)); 102 } 103 104 __attr __fn_native_str_str_nonempty(__attr __args[]) 105 { 106 __attr * const _data = &__args[1]; 107 108 return _data->strvalue[0] ? __builtins___boolean_True : __builtins___boolean_False; 109 } 110 111 __attr __fn_native_str_str_ord(__attr __args[]) 112 { 113 __attr * const _data = &__args[1]; 114 /* _data interpreted as string */ 115 char *s = _data->strvalue; 116 117 return __new_int((unsigned int) s[0]); 118 } 119 120 __attr __fn_native_str_str_substr(__attr __args[]) 121 { 122 __attr * const _data = &__args[1]; 123 __attr * const start = &__args[2]; 124 __attr * const end = &__args[3]; 125 __attr * const step = &__args[4]; 126 /* _data interpreted as string */ 127 char *s = _data->strvalue, *sub; 128 /* start.__data__ interpreted as int */ 129 int istart = __load_via_object(start->value, __pos___data__).intvalue; 130 /* end.__data__ interpreted as int */ 131 int iend = __load_via_object(end->value, __pos___data__).intvalue; 132 /* step.__data__ interpreted as int */ 133 int istep = __load_via_object(step->value, __pos___data__).intvalue; 134 135 /* Calculate the size of the substring. */ 136 size_t resultsize = ((iend - istart - (istep > 0 ? 1 : -1)) / istep) + 1; 137 int to, from; 138 139 /* Reserve space for a new string. */ 140 sub = (char *) __ALLOCATE(resultsize + 1, sizeof(char)); 141 142 /* Does not null terminate but final byte should be zero. */ 143 if (istep > 0) 144 for (from = istart, to = 0; from < iend; from += istep, to++) 145 sub[to] = s[from]; 146 else if (istep < 0) 147 for (from = istart, to = 0; from > iend; from += istep, to++) 148 sub[to] = s[from]; 149 150 return __new_str(sub); 151 } 152 153 /* Module initialisation. */ 154 155 void __main_native_str() 156 { 157 }