| Elliott Hughes | 7f0849f | 2016-08-26 16:17:17 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2016 The Android Open Source Project |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * * Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * * Redistributions in binary form must reproduce the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer in |
| 12 | * the documentation and/or other materials provided with the |
| 13 | * distribution. |
| 14 | * |
| 15 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 16 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 17 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| 18 | * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
| 19 | * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 20 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
| 21 | * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS |
| 22 | * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
| 23 | * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| 24 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| 25 | * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 26 | * SUCH DAMAGE. |
| 27 | */ |
| 28 | |
| 29 | #include<wchar.h> |
| 30 | |
| 31 | #include<stdlib.h> |
| Dan Albert | 1c78cb0 | 2017-10-11 11:25:25 -0700 | [diff] [blame] | 32 | #include<string.h> |
| Elliott Hughes | 7f0849f | 2016-08-26 16:17:17 -0700 | [diff] [blame] | 33 | |
| 34 | #include"local.h" |
| 35 | |
| Dan Albert | f634655 | 2016-12-02 12:02:03 -0800 | [diff] [blame] | 36 | /// Performs wide-character string to floating point conversion. |
| 37 | template<typename float_type> |
| 38 | float_type wcstod(constwchar_t* str,wchar_t** end, float_type strtod_fn(constchar*,char**)){ |
| 39 | constwchar_t* original_str= str; |
| 40 | while(iswspace(*str)){ |
| 41 | str++; |
| 42 | } |
| 43 | |
| Elliott Hughes | 7f0849f | 2016-08-26 16:17:17 -0700 | [diff] [blame] | 44 | // What's the longest span of the input that might be part of the float? |
| 45 | size_t max_len= wcsspn(str, L"-+0123456789.xXeEpP()nNaAiIfFtTyY"); |
| 46 | |
| 47 | // We know the only valid characters are ASCII, so convert them by brute force. |
| 48 | char* ascii_str=newchar[max_len+1]; |
| 49 | if(!ascii_str)return float_type(); |
| 50 | for(size_t i=0; i< max_len;++i){ |
| 51 | ascii_str[i]= str[i]&0xff; |
| 52 | } |
| 53 | ascii_str[max_len]=0; |
| 54 | |
| 55 | // Set up a fake FILE that points to those ASCII characters, for `parsefloat`. |
| 56 | FILE f; |
| 57 | __sfileext fext; |
| 58 | _FILEEXT_SETUP(&f,&fext); |
| 59 | f._flags= __SRD; |
| 60 | f._bf._base= f._p=reinterpret_cast<unsignedchar*>(ascii_str); |
| 61 | f._bf._size= f._r= max_len; |
| 62 | f._read=[](void*,char*,int){return0;};// aka `eofread`, aka "no more data". |
| Yi Kong | 32bc0fc | 2018-08-02 17:31:13 -0700 | [diff] [blame] | 63 | f._lb._base=nullptr; |
| Elliott Hughes | 7f0849f | 2016-08-26 16:17:17 -0700 | [diff] [blame] | 64 | |
| 65 | // Ask `parsefloat` to look at the same data more carefully. |
| 66 | |
| 67 | // We can't just do this straight away because we can't construct a suitable FILE* |
| 68 | // in the absence of any `fwmemopen` analogous to `fmemopen`. And we don't want to |
| 69 | // duplicate the `parsefloat` logic. We also don't want to actually have to have wchar_t |
| 70 | // implementations of the ASCII `strtod` logic (though if you were designing a libc |
| 71 | // from scratch, you'd probably want to just make that more generic and lose all the |
| 72 | // cruft on top). |
| 73 | size_t actual_len= parsefloat(&f, ascii_str, ascii_str+ max_len); |
| 74 | |
| 75 | // Finally let the ASCII conversion function do the work. |
| 76 | char* ascii_end; |
| 77 | float_type result= strtod_fn(ascii_str,&ascii_end); |
| 78 | if(ascii_end!= ascii_str+ actual_len) abort(); |
| 79 | |
| Dan Albert | f634655 | 2016-12-02 12:02:03 -0800 | [diff] [blame] | 80 | if(end){ |
| 81 | if(actual_len==0){ |
| 82 | // There was an error. We need to set the end pointer back to the original string, not the |
| 83 | // one we advanced past the leading whitespace. |
| 84 | *end=const_cast<wchar_t*>(original_str); |
| 85 | }else{ |
| 86 | *end=const_cast<wchar_t*>(str)+ actual_len; |
| 87 | } |
| 88 | } |
| Elliott Hughes | 7f0849f | 2016-08-26 16:17:17 -0700 | [diff] [blame] | 89 | |
| 90 | delete[] ascii_str; |
| 91 | return result; |
| 92 | } |
| 93 | |
| 94 | float wcstof(constwchar_t* s,wchar_t** end){ |
| 95 | return wcstod<float>(s, end, strtof); |
| 96 | } |
| Elliott Hughes | 1fc68c7 | 2024-08-13 15:48:00 +0000 | [diff] [blame] | 97 | __strong_alias(wcstof_l, wcstof); |
| Elliott Hughes | 7f0849f | 2016-08-26 16:17:17 -0700 | [diff] [blame] | 98 | |
| 99 | double wcstod(constwchar_t* s,wchar_t** end){ |
| 100 | return wcstod<double>(s, end, strtod); |
| 101 | } |
| Elliott Hughes | 1fc68c7 | 2024-08-13 15:48:00 +0000 | [diff] [blame] | 102 | __strong_alias(wcstod_l, wcstod); |
| Elliott Hughes | 7f0849f | 2016-08-26 16:17:17 -0700 | [diff] [blame] | 103 | |
| 104 | longdouble wcstold(constwchar_t* s,wchar_t** end){ |
| 105 | return wcstod<longdouble>(s, end, strtold); |
| 106 | } |
| Elliott Hughes | 1fc68c7 | 2024-08-13 15:48:00 +0000 | [diff] [blame] | 107 | __strong_alias(wcstold_l, wcstold); |
