| 1 | /* Implementation of strtod for systems with atof. |
| 2 | Copyright (C) 1991-2019 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of the libiberty library. This library is free |
| 5 | software; you can redistribute it and/or modify it under the |
| 6 | terms of the GNU General Public License as published by the |
| 7 | Free Software Foundation; either version 2, or (at your option) |
| 8 | any later version. |
| 9 | |
| 10 | This library is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | GNU General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU General Public License |
| 16 | along with GNU CC; see the file COPYING. If not, write to |
| 17 | the Free Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. |
| 18 | |
| 19 | As a special exception, if you link this library with files |
| 20 | compiled with a GNU compiler to produce an executable, this does not cause |
| 21 | the resulting executable to be covered by the GNU General Public License. |
| 22 | This exception does not however invalidate any other reasons why |
| 23 | the executable file might be covered by the GNU General Public License. */ |
| 24 | |
| 25 | /* |
| 26 | |
| 27 | @deftypefn Supplemental double strtod (const char *@var{string}, @ |
| 28 | char **@var{endptr}) |
| 29 | |
| 30 | This ISO C function converts the initial portion of @var{string} to a |
| 31 | @code{double}. If @var{endptr} is not @code{NULL}, a pointer to the |
| 32 | character after the last character used in the conversion is stored in |
| 33 | the location referenced by @var{endptr}. If no conversion is |
| 34 | performed, zero is returned and the value of @var{string} is stored in |
| 35 | the location referenced by @var{endptr}. |
| 36 | |
| 37 | @end deftypefn |
| 38 | |
| 39 | */ |
| 40 | |
| 41 | #include "ansidecl.h" |
| 42 | #include "safe-ctype.h" |
| 43 | |
| 44 | extern double atof (const char *); |
| 45 | |
| 46 | /* Disclaimer: this is currently just used by CHILL in GDB and therefore |
| 47 | has not been tested well. It may have been tested for nothing except |
| 48 | that it compiles. */ |
| 49 | |
| 50 | double |
| 51 | strtod (char *str, char **ptr) |
| 52 | { |
| 53 | char *p; |
| 54 | |
| 55 | if (ptr == (char **)0) |
| 56 | return atof (str); |
| 57 | |
| 58 | p = str; |
| 59 | |
| 60 | while (ISSPACE (*p)) |
| 61 | ++p; |
| 62 | |
| 63 | if (*p == '+' || *p == '-') |
| 64 | ++p; |
| 65 | |
| 66 | /* INF or INFINITY. */ |
| 67 | if ((p[0] == 'i' || p[0] == 'I') |
| 68 | && (p[1] == 'n' || p[1] == 'N') |
| 69 | && (p[2] == 'f' || p[2] == 'F')) |
| 70 | { |
| 71 | if ((p[3] == 'i' || p[3] == 'I') |
| 72 | && (p[4] == 'n' || p[4] == 'N') |
| 73 | && (p[5] == 'i' || p[5] == 'I') |
| 74 | && (p[6] == 't' || p[6] == 'T') |
| 75 | && (p[7] == 'y' || p[7] == 'Y')) |
| 76 | { |
| 77 | *ptr = p + 8; |
| 78 | return atof (str); |
| 79 | } |
| 80 | else |
| 81 | { |
| 82 | *ptr = p + 3; |
| 83 | return atof (str); |
| 84 | } |
| 85 | } |
| 86 | |
| 87 | /* NAN or NAN(foo). */ |
| 88 | if ((p[0] == 'n' || p[0] == 'N') |
| 89 | && (p[1] == 'a' || p[1] == 'A') |
| 90 | && (p[2] == 'n' || p[2] == 'N')) |
| 91 | { |
| 92 | p += 3; |
| 93 | if (*p == '(') |
| 94 | { |
| 95 | ++p; |
| 96 | while (*p != '\0' && *p != ')') |
| 97 | ++p; |
| 98 | if (*p == ')') |
| 99 | ++p; |
| 100 | } |
| 101 | *ptr = p; |
| 102 | return atof (str); |
| 103 | } |
| 104 | |
| 105 | /* digits, with 0 or 1 periods in it. */ |
| 106 | if (ISDIGIT (*p) || *p == '.') |
| 107 | { |
| 108 | int got_dot = 0; |
| 109 | while (ISDIGIT (*p) || (!got_dot && *p == '.')) |
| 110 | { |
| 111 | if (*p == '.') |
| 112 | got_dot = 1; |
| 113 | ++p; |
| 114 | } |
| 115 | |
| 116 | /* Exponent. */ |
| 117 | if (*p == 'e' || *p == 'E') |
| 118 | { |
| 119 | int i; |
| 120 | i = 1; |
| 121 | if (p[i] == '+' || p[i] == '-') |
| 122 | ++i; |
| 123 | if (ISDIGIT (p[i])) |
| 124 | { |
| 125 | while (ISDIGIT (p[i])) |
| 126 | ++i; |
| 127 | *ptr = p + i; |
| 128 | return atof (str); |
| 129 | } |
| 130 | } |
| 131 | *ptr = p; |
| 132 | return atof (str); |
| 133 | } |
| 134 | /* Didn't find any digits. Doesn't look like a number. */ |
| 135 | *ptr = str; |
| 136 | return 0.0; |
| 137 | } |