1 /**************************************************************** 2 3 The author of this software is David M. Gay. 4 5 Copyright (C) 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 David M. Gay (dmg at acm dot org, 30 * with " at " changed at "@" and " dot " changed to "."). */ 31 32 /* $FreeBSD$ */ 33 34 #include <ctype.h> 35 36 #include "gdtoaimp.h" 37 38 static void 39 #ifdef KR_headers 40 L_shift(x, x1, i) ULong *x; ULong *x1; int i; 41 #else 42 L_shift(ULong *x, ULong *x1, int i) 43 #endif 44 { 45 int j; 46 47 i = 8 - i; 48 i <<= 2; 49 j = ULbits - i; 50 do { 51 *x |= x[1] << j; 52 x[1] >>= i; 53 } while(++x < x1); 54 } 55 56 int 57 #ifdef KR_headers 58 hexnan(sp, fpi, x0) 59 CONST char **sp; FPI *fpi; ULong *x0; 60 #else 61 hexnan( CONST char **sp, FPI *fpi, ULong *x0) 62 #endif 63 { 64 ULong c, h, *x, *x1, *xe; 65 CONST char *s; 66 int havedig, hd0, i, nbits; 67 68 if (!hexdig['0']) 69 hexdig_init_D2A(); 70 nbits = fpi->nbits; 71 x = x0 + (nbits >> kshift); 72 if (nbits & kmask) 73 x++; 74 *--x = 0; 75 x1 = xe = x; 76 havedig = hd0 = i = 0; 77 s = *sp; 78 79 /* FreeBSD local: Accept (but ignore) the '0x' prefix. */ 80 if (s[1] == '0' && (s[2] == 'x' || s[2] == 'X')) 81 s += 2; 82 83 while(c = *(CONST unsigned char*)++s) { 84 if (!(h = hexdig[c])) { 85 #if 0 86 if (c <= ' ') { 87 if (hd0 < havedig) { 88 if (x < x1 && i < 8) 89 L_shift(x, x1, i); 90 if (x <= x0) { 91 i = 8; 92 continue; 93 } 94 hd0 = havedig; 95 *--x = 0; 96 x1 = x; 97 i = 0; 98 } 99 continue; 100 } 101 if (/*(*/ c == ')' && havedig) { 102 *sp = s + 1; 103 break; 104 } 105 #endif 106 break; 107 } 108 havedig++; 109 if (++i > 8) { 110 if (x <= x0) 111 continue; 112 i = 1; 113 *--x = 0; 114 } 115 *x = (*x << 4) | h & 0xf; 116 } 117 if (havedig && x < x1 && i < 8) 118 L_shift(x, x1, i); 119 if (x > x0) { 120 x1 = x0; 121 do *x1++ = *x++; 122 while(x <= xe); 123 do *x1++ = 0; 124 while(x1 <= xe); 125 } 126 else { 127 /* truncate high-order word if necessary */ 128 if ( (i = nbits & (ULbits-1)) !=0) 129 *xe &= ((ULong)0xffffffff) >> (ULbits - i); 130 } 131 if (havedig) { 132 for(x1 = xe;; --x1) { 133 if (*x1 != 0) 134 break; 135 if (x1 == x0) { 136 *x1 = 1; 137 break; 138 } 139 } 140 } 141 142 /* 143 * FreeBSD local: Accept all the sequences allowed by C99 and update 144 * the tail pointer correctly. Don't accept any invalid sequences. 145 */ 146 if (c == '\0') /* nan() calls this, too; tolerate a missing ')' */ 147 return STRTOG_NaNbits; 148 if (c != ')') { 149 while(c = *(CONST unsigned char*)++s) { 150 if (c == ')') 151 break; 152 if (!isalnum(c) && c != '_') 153 return STRTOG_NaNbits; 154 } 155 } 156 *sp = s + 1; 157 return STRTOG_NaNbits; 158 } 159