projects / apple / libc.git / blame
| Commit | Line | Data |
|---|---|---|
| 9385eb3d A |
1 | /**************************************************************** |
| 2 | ||
| 3 | The author of this software is David M. Gay. | |
| 4 | ||
| 5 | Copyright (C) 1998, 2000 by Lucent Technologies | |
| 6 | All Rights Reserved | |
| 7 | ||
| 8 | Permission to use, copy, modify, and distribute this software and | |
| 9 | its documentation for any purpose and without fee is hereby | |
| 10 | granted, provided that the above copyright notice appear in all | |
| 11 | copies and that both that the copyright notice and this | |
| 12 | permission notice and warranty disclaimer appear in supporting | |
| 13 | documentation, and that the name of Lucent or any of its entities | |
| 14 | not be used in advertising or publicity pertaining to | |
| 15 | distribution of the software without specific, written prior | |
| 16 | permission. | |
| 17 | ||
| 18 | LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, | |
| 19 | INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. | |
| 20 | IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY | |
| 21 | SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | |
| 22 | WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER | |
| 23 | IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, | |
| 24 | ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF | |
| 25 | THIS SOFTWARE. | |
| 26 | ||
| 27 | ****************************************************************/ | |
| 28 | ||
| 29 | /* Please send bug reports to | |
| 30 | David M. Gay | |
| 31 | Bell Laboratories, Room 2C-463 | |
| 32 | 600 Mountain Avenue | |
| 33 | Murray Hill, NJ 07974-0636 | |
| 34 | U.S.A. | |
| 35 | dmg@bell-labs.com | |
| 36 | */ | |
| 37 | ||
| 38 | #include "gdtoaimp.h" | |
| 39 | ||
| 40 | float | |
| 41 | #ifdef KR_headers | |
| 42 | strtof(s, sp) CONST char *s; char **sp; | |
| 43 | #else | |
| 44 | strtof(CONST char *s, char **sp) | |
| 45 | #endif | |
| 46 | { | |
| 47 | #ifdef Sudden_Underflow | |
| 48 | static FPI fpi = { 24, 1-127-24+1, 254-127-24+1, 1, 1 }; | |
| 49 | #else | |
| 50 | static FPI fpi = { 24, 1-127-24+1, 254-127-24+1, 1, 0 }; | |
| 51 | #endif | |
| 52 | ULong bits[1]; | |
| 53 | Long exp; | |
| 54 | int k; | |
| 55 | union { ULong L[1]; float f; } u; | |
| 56 | ||
| 57 | k = strtodg(s, sp, &fpi, &exp, bits); | |
| 58 | switch(k & STRTOG_Retmask) { | |
| 59 | case STRTOG_NoNumber: | |
| 60 | case STRTOG_Zero: | |
| 61 | u.L[0] = 0; | |
| 62 | break; | |
| 63 | ||
| 64 | case STRTOG_Normal: | |
| 65 | case STRTOG_NaNbits: | |
| 66 | u.L[0] = bits[0] & 0x7fffff | exp + 0x7f + 23 << 23; | |
| 67 | break; | |
| 68 | ||
| 69 | case STRTOG_Denormal: | |
| 70 | u.L[0] = bits[0]; | |
| 71 | break; | |
| 72 | ||
| 73 | case STRTOG_Infinite: | |
| 74 | u.L[0] = 0x7f800000; | |
| 75 | break; | |
| 76 | ||
| 77 | case STRTOG_NaN: | |
| 78 | u.L[0] = 0x7fffffff; | |
| 79 | } | |
| 80 | if (k & STRTOG_Neg) | |
| 81 | u.L[0] |= 0x80000000L; | |
| 82 | return u.f; | |
| 83 | } |