aboutsummaryrefslogtreecommitdiff
path: root/libiberty/strtod.c
diff options
context:
space:
mode:
authorRichard Henderson <rth@redhat.com>1999-05-03 07:29:11 +0000
committerRichard Henderson <rth@redhat.com>1999-05-03 07:29:11 +0000
commit252b5132c753830d5fd56823373aed85f2a0db63 (patch)
tree1af963bfd8d3e55167b81def4207f175eaff3a56 /libiberty/strtod.c
downloadgdb-252b5132c753830d5fd56823373aed85f2a0db63.zip
gdb-252b5132c753830d5fd56823373aed85f2a0db63.tar.gz
gdb-252b5132c753830d5fd56823373aed85f2a0db63.tar.bz2
19990502 sourceware importbinu_ss_19990502
Diffstat (limited to 'libiberty/strtod.c')
-rw-r--r--libiberty/strtod.c122
1 files changed, 122 insertions, 0 deletions
diff --git a/libiberty/strtod.c b/libiberty/strtod.c
new file mode 100644
index 0000000..c86c73d
--- /dev/null
+++ b/libiberty/strtod.c
@@ -0,0 +1,122 @@
+/* Implementation of strtod for systems with atof.
+ Copyright (C) 1991, 1995 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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. */
+
+#include <ctype.h>
+
+extern double atof ();
+
+/* 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 (str, ptr)
+ 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 + 7;
+ 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;
+}