diff options
Diffstat (limited to 'gcc-4.7/libiberty/strtod.c')
| -rw-r--r-- | gcc-4.7/libiberty/strtod.c | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/gcc-4.7/libiberty/strtod.c b/gcc-4.7/libiberty/strtod.c new file mode 100644 index 000000000..e4da2113f --- /dev/null +++ b/gcc-4.7/libiberty/strtod.c @@ -0,0 +1,137 @@ +/* Implementation of strtod for systems with atof. + Copyright (C) 1991, 1995, 2002, 2011 Free Software Foundation, Inc. + +This file is part of the libiberty library. This library is free +software; you can redistribute it and/or modify it under the +terms of the GNU General Public License as published by the +Free Software Foundation; either version 2, or (at your option) +any later version. + +This library is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU CC; see the file COPYING. If not, write to +the Free Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. + +As a special exception, if you link this library with files +compiled with a GNU compiler to produce an executable, this does not cause +the resulting executable to be covered by the GNU General Public License. +This exception does not however invalidate any other reasons why +the executable file might be covered by the GNU General Public License. */ + +/* + +@deftypefn Supplemental double strtod (const char *@var{string}, @ + char **@var{endptr}) + +This ISO C function converts the initial portion of @var{string} to a +@code{double}. If @var{endptr} is not @code{NULL}, a pointer to the +character after the last character used in the conversion is stored in +the location referenced by @var{endptr}. If no conversion is +performed, zero is returned and the value of @var{string} is stored in +the location referenced by @var{endptr}. + +@end deftypefn + +*/ + +#include "ansidecl.h" +#include "safe-ctype.h" + +extern double atof (const char *); + +/* Disclaimer: this is currently just used by CHILL in GDB and therefore + has not been tested well. It may have been tested for nothing except + that it compiles. */ + +double +strtod (char *str, char **ptr) +{ + char *p; + + if (ptr == (char **)0) + return atof (str); + + p = str; + + while (ISSPACE (*p)) + ++p; + + if (*p == '+' || *p == '-') + ++p; + + /* INF or INFINITY. */ + if ((p[0] == 'i' || p[0] == 'I') + && (p[1] == 'n' || p[1] == 'N') + && (p[2] == 'f' || p[2] == 'F')) + { + if ((p[3] == 'i' || p[3] == 'I') + && (p[4] == 'n' || p[4] == 'N') + && (p[5] == 'i' || p[5] == 'I') + && (p[6] == 't' || p[6] == 'T') + && (p[7] == 'y' || p[7] == 'Y')) + { + *ptr = p + 8; + return atof (str); + } + else + { + *ptr = p + 3; + return atof (str); + } + } + + /* NAN or NAN(foo). */ + if ((p[0] == 'n' || p[0] == 'N') + && (p[1] == 'a' || p[1] == 'A') + && (p[2] == 'n' || p[2] == 'N')) + { + p += 3; + if (*p == '(') + { + ++p; + while (*p != '\0' && *p != ')') + ++p; + if (*p == ')') + ++p; + } + *ptr = p; + return atof (str); + } + + /* digits, with 0 or 1 periods in it. */ + if (ISDIGIT (*p) || *p == '.') + { + int got_dot = 0; + while (ISDIGIT (*p) || (!got_dot && *p == '.')) + { + if (*p == '.') + got_dot = 1; + ++p; + } + + /* Exponent. */ + if (*p == 'e' || *p == 'E') + { + int i; + i = 1; + if (p[i] == '+' || p[i] == '-') + ++i; + if (ISDIGIT (p[i])) + { + while (ISDIGIT (p[i])) + ++i; + *ptr = p + i; + return atof (str); + } + } + *ptr = p; + return atof (str); + } + /* Didn't find any digits. Doesn't look like a number. */ + *ptr = str; + return 0.0; +} |