1233294Sstas/* Implementation of strtod for systems with atof. 2233294Sstas Copyright (C) 1991, 1995, 2002 Free Software Foundation, Inc. 3233294Sstas 4233294SstasThis file is part of the libiberty library. This library is free 5233294Sstassoftware; you can redistribute it and/or modify it under the 6233294Sstasterms of the GNU General Public License as published by the 7233294SstasFree Software Foundation; either version 2, or (at your option) 8233294Sstasany later version. 9233294Sstas 10233294SstasThis library is distributed in the hope that it will be useful, 11275022Sbaptbut WITHOUT ANY WARRANTY; without even the implied warranty of 12287216SumeMERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13233294SstasGNU General Public License for more details. 14288199Sbdrewery 15288199SbdreweryYou should have received a copy of the GNU General Public License 16236337Sobrienalong with GNU CC; see the file COPYING. If not, write to 17236422Sobrienthe Free Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. 18233294Sstas 19288200SbdreweryAs a special exception, if you link this library with files 20236337Sobriencompiled with a GNU compiler to produce an executable, this does not cause 21233294Sstasthe resulting executable to be covered by the GNU General Public License. 22233294SstasThis exception does not however invalidate any other reasons why 23233294Sstasthe executable file might be covered by the GNU General Public License. */ 24 25/* 26 27@deftypefn Supplemental double strtod (const char *@var{string}, char **@var{endptr}) 28 29This ISO C function converts the initial portion of @var{string} to a 30@code{double}. If @var{endptr} is not @code{NULL}, a pointer to the 31character after the last character used in the conversion is stored in 32the location referenced by @var{endptr}. If no conversion is 33performed, zero is returned and the value of @var{string} is stored in 34the location referenced by @var{endptr}. 35 36@end deftypefn 37 38*/ 39 40#include "ansidecl.h" 41#include "safe-ctype.h" 42 43extern double atof (const char *); 44 45/* Disclaimer: this is currently just used by CHILL in GDB and therefore 46 has not been tested well. It may have been tested for nothing except 47 that it compiles. */ 48 49double 50strtod (char *str, char **ptr) 51{ 52 char *p; 53 54 if (ptr == (char **)0) 55 return atof (str); 56 57 p = str; 58 59 while (ISSPACE (*p)) 60 ++p; 61 62 if (*p == '+' || *p == '-') 63 ++p; 64 65 /* INF or INFINITY. */ 66 if ((p[0] == 'i' || p[0] == 'I') 67 && (p[1] == 'n' || p[1] == 'N') 68 && (p[2] == 'f' || p[2] == 'F')) 69 { 70 if ((p[3] == 'i' || p[3] == 'I') 71 && (p[4] == 'n' || p[4] == 'N') 72 && (p[5] == 'i' || p[5] == 'I') 73 && (p[6] == 't' || p[6] == 'T') 74 && (p[7] == 'y' || p[7] == 'Y')) 75 { 76 *ptr = p + 8; 77 return atof (str); 78 } 79 else 80 { 81 *ptr = p + 3; 82 return atof (str); 83 } 84 } 85 86 /* NAN or NAN(foo). */ 87 if ((p[0] == 'n' || p[0] == 'N') 88 && (p[1] == 'a' || p[1] == 'A') 89 && (p[2] == 'n' || p[2] == 'N')) 90 { 91 p += 3; 92 if (*p == '(') 93 { 94 ++p; 95 while (*p != '\0' && *p != ')') 96 ++p; 97 if (*p == ')') 98 ++p; 99 } 100 *ptr = p; 101 return atof (str); 102 } 103 104 /* digits, with 0 or 1 periods in it. */ 105 if (ISDIGIT (*p) || *p == '.') 106 { 107 int got_dot = 0; 108 while (ISDIGIT (*p) || (!got_dot && *p == '.')) 109 { 110 if (*p == '.') 111 got_dot = 1; 112 ++p; 113 } 114 115 /* Exponent. */ 116 if (*p == 'e' || *p == 'E') 117 { 118 int i; 119 i = 1; 120 if (p[i] == '+' || p[i] == '-') 121 ++i; 122 if (ISDIGIT (p[i])) 123 { 124 while (ISDIGIT (p[i])) 125 ++i; 126 *ptr = p + i; 127 return atof (str); 128 } 129 } 130 *ptr = p; 131 return atof (str); 132 } 133 /* Didn't find any digits. Doesn't look like a number. */ 134 *ptr = str; 135 return 0.0; 136} 137