mirror of
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35fadee53d
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@11981 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
939 lines
22 KiB
C
939 lines
22 KiB
C
/**********************************************************************
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util.c -
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$Author$
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$Date$
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created at: Fri Mar 10 17:22:34 JST 1995
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Copyright (C) 1993-2003 Yukihiro Matsumoto
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**********************************************************************/
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#include "ruby.h"
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#include <ctype.h>
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#include <stdio.h>
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#include <errno.h>
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#include <math.h>
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#include <float.h>
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#ifdef _WIN32
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#include "missing/file.h"
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#endif
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#include "util.h"
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unsigned long
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ruby_scan_oct(const char *start, int len, int *retlen)
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{
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register const char *s = start;
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register unsigned long retval = 0;
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while (len-- && *s >= '0' && *s <= '7') {
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retval <<= 3;
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retval |= *s++ - '0';
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}
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*retlen = s - start;
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return retval;
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}
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unsigned long
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ruby_scan_hex(const char *start, int len, int *retlen)
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{
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static char hexdigit[] = "0123456789abcdef0123456789ABCDEF";
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register const char *s = start;
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register unsigned long retval = 0;
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char *tmp;
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while (len-- && *s && (tmp = strchr(hexdigit, *s))) {
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retval <<= 4;
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retval |= (tmp - hexdigit) & 15;
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s++;
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}
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*retlen = s - start;
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return retval;
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}
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#include <sys/types.h>
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#include <sys/stat.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#if defined(HAVE_FCNTL_H)
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#include <fcntl.h>
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#endif
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#ifndef S_ISDIR
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# define S_ISDIR(m) ((m & S_IFMT) == S_IFDIR)
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#endif
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#if defined(MSDOS) || defined(__CYGWIN32__) || defined(_WIN32)
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/*
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* Copyright (c) 1993, Intergraph Corporation
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*
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* You may distribute under the terms of either the GNU General Public
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* License or the Artistic License, as specified in the perl README file.
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*
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* Various Unix compatibility functions and NT specific functions.
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*
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* Some of this code was derived from the MSDOS port(s) and the OS/2 port.
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*
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*/
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/*
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* Suffix appending for in-place editing under MS-DOS and OS/2 (and now NT!).
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*
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* Here are the rules:
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*
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* Style 0: Append the suffix exactly as standard perl would do it.
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* If the filesystem groks it, use it. (HPFS will always
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* grok it. So will NTFS. FAT will rarely accept it.)
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*
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* Style 1: The suffix begins with a '.'. The extension is replaced.
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* If the name matches the original name, use the fallback method.
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*
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* Style 2: The suffix is a single character, not a '.'. Try to add the
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* suffix to the following places, using the first one that works.
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* [1] Append to extension.
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* [2] Append to filename,
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* [3] Replace end of extension,
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* [4] Replace end of filename.
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* If the name matches the original name, use the fallback method.
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*
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* Style 3: Any other case: Ignore the suffix completely and use the
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* fallback method.
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*
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* Fallback method: Change the extension to ".$$$". If that matches the
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* original name, then change the extension to ".~~~".
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*
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* If filename is more than 1000 characters long, we die a horrible
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* death. Sorry.
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*
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* The filename restriction is a cheat so that we can use buf[] to store
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* assorted temporary goo.
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*
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* Examples, assuming style 0 failed.
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*
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* suffix = ".bak" (style 1)
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* foo.bar => foo.bak
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* foo.bak => foo.$$$ (fallback)
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* foo.$$$ => foo.~~~ (fallback)
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* makefile => makefile.bak
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*
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* suffix = "~" (style 2)
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* foo.c => foo.c~
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* foo.c~ => foo.c~~
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* foo.c~~ => foo~.c~~
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* foo~.c~~ => foo~~.c~~
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* foo~~~~~.c~~ => foo~~~~~.$$$ (fallback)
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*
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* foo.pas => foo~.pas
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* makefile => makefile.~
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* longname.fil => longname.fi~
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* longname.fi~ => longnam~.fi~
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* longnam~.fi~ => longnam~.$$$
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*
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*/
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static int valid_filename(const char *s);
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static const char suffix1[] = ".$$$";
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static const char suffix2[] = ".~~~";
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#define ext (&buf[1000])
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#define strEQ(s1,s2) (strcmp(s1,s2) == 0)
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void
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ruby_add_suffix(VALUE str, const char *suffix)
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{
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int baselen;
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int extlen = strlen(suffix);
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char *s, *t, *p;
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long slen;
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char buf[1024];
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if (RSTRING_LEN(str) > 1000)
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rb_fatal("Cannot do inplace edit on long filename (%ld characters)",
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RSTRING_LEN(str));
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#if defined(DJGPP) || defined(__CYGWIN32__) || defined(_WIN32)
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/* Style 0 */
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slen = RSTRING_LEN(str);
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rb_str_cat(str, suffix, extlen);
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#if defined(DJGPP)
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if (_USE_LFN) return;
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#else
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if (valid_filename(RSTRING_PTR(str))) return;
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#endif
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/* Fooey, style 0 failed. Fix str before continuing. */
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rb_str_resize(str, slen);
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#endif
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slen = extlen;
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t = buf; baselen = 0; s = RSTRING_PTR(str);
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while ((*t = *s) && *s != '.') {
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baselen++;
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if (*s == '\\' || *s == '/') baselen = 0;
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s++; t++;
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}
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p = t;
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t = ext; extlen = 0;
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while (*t++ = *s++) extlen++;
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if (extlen == 0) { ext[0] = '.'; ext[1] = 0; extlen++; }
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if (*suffix == '.') { /* Style 1 */
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if (strEQ(ext, suffix)) goto fallback;
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strcpy(p, suffix);
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}
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else if (suffix[1] == '\0') { /* Style 2 */
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if (extlen < 4) {
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ext[extlen] = *suffix;
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ext[++extlen] = '\0';
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}
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else if (baselen < 8) {
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*p++ = *suffix;
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}
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else if (ext[3] != *suffix) {
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ext[3] = *suffix;
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}
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else if (buf[7] != *suffix) {
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buf[7] = *suffix;
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}
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else goto fallback;
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strcpy(p, ext);
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}
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else { /* Style 3: Panic */
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fallback:
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(void)memcpy(p, strEQ(ext, suffix1) ? suffix2 : suffix1, 5);
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}
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rb_str_resize(str, strlen(buf));
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memcpy(RSTRING_PTR(str), buf, RSTRING_LEN(str));
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}
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#if defined(__CYGWIN32__) || defined(_WIN32)
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static int
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valid_filename(const char *s)
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{
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int fd;
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/*
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// if the file exists, then it's a valid filename!
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*/
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if (_access(s, 0) == 0) {
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return 1;
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}
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/*
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// It doesn't exist, so see if we can open it.
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*/
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if ((fd = _open(s, O_CREAT, 0666)) >= 0) {
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_close(fd);
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_unlink(s); /* don't leave it laying around */
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return 1;
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}
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return 0;
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}
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#endif
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#endif
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#if defined __DJGPP__
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#include <dpmi.h>
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static char dbcs_table[256];
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int
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make_dbcs_table()
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{
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__dpmi_regs r;
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struct {
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unsigned char start;
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unsigned char end;
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} vec;
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int offset;
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memset(&r, 0, sizeof(r));
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r.x.ax = 0x6300;
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__dpmi_int(0x21, &r);
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offset = r.x.ds * 16 + r.x.si;
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for (;;) {
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int i;
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dosmemget(offset, sizeof vec, &vec);
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if (!vec.start && !vec.end)
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break;
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for (i = vec.start; i <= vec.end; i++)
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dbcs_table[i] = 1;
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offset += 2;
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}
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}
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int
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mblen(const char *s, size_t n)
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{
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static int need_init = 1;
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if (need_init) {
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make_dbcs_table();
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need_init = 0;
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}
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if (s) {
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if (n == 0 || *s == 0)
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return 0;
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else if (!s[1])
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return 1;
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return dbcs_table[(unsigned char)*s] + 1;
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}
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else
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return 1;
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}
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struct PathList {
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struct PathList *next;
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char *path;
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};
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struct PathInfo {
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struct PathList *head;
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int count;
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};
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static int
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push_element(const char *path, VALUE vinfo)
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{
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struct PathList *p;
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struct PathInfo *info = (struct PathInfo *)vinfo;
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p = ALLOC(struct PathList);
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MEMZERO(p, struct PathList, 1);
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p->path = ruby_strdup(path);
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p->next = info->head;
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info->head = p;
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info->count++;
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return 0;
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}
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#include <dirent.h>
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int __opendir_flags = __OPENDIR_PRESERVE_CASE;
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char **
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__crt0_glob_function(char *path)
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{
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int len = strlen(path);
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int i;
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char **rv;
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char path_buffer[PATH_MAX];
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char *buf = path_buffer;
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char *p;
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struct PathInfo info;
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struct PathList *plist;
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if (PATH_MAX <= len)
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buf = ruby_xmalloc(len + 1);
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strncpy(buf, path, len);
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buf[len] = '\0';
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for (p = buf; *p; p += mblen(p, RUBY_MBCHAR_MAXSIZE))
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if (*p == '\\')
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*p = '/';
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info.count = 0;
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info.head = 0;
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ruby_glob(buf, 0, push_element, (VALUE)&info);
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if (buf != path_buffer)
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ruby_xfree(buf);
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if (info.count == 0)
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return 0;
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rv = ruby_xmalloc((info.count + 1) * sizeof (char *));
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plist = info.head;
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i = 0;
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while (plist) {
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struct PathList *cur;
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rv[i] = plist->path;
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cur = plist;
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plist = plist->next;
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ruby_xfree(cur);
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i++;
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}
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rv[i] = 0;
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return rv;
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}
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#endif
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/* mm.c */
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#define A ((int*)a)
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#define B ((int*)b)
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#define C ((int*)c)
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#define D ((int*)d)
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#define mmprepare(base, size) do {\
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if (((long)base & (0x3)) == 0)\
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if (size >= 16) mmkind = 1;\
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else mmkind = 0;\
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else mmkind = -1;\
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high = (size & (~0xf));\
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low = (size & 0x0c);\
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} while (0)\
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#define mmarg mmkind, size, high, low
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static void mmswap_(a, b, mmarg)
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register char *a, *b;
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int mmarg;
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{
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register int s;
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if (a == b) return;
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if (mmkind >= 0) {
|
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if (mmkind > 0) {
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register char *t = a + high;
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do {
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s = A[0]; A[0] = B[0]; B[0] = s;
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s = A[1]; A[1] = B[1]; B[1] = s;
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s = A[2]; A[2] = B[2]; B[2] = s;
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s = A[3]; A[3] = B[3]; B[3] = s; a += 16; b += 16;
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} while (a < t);
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}
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if (low != 0) { s = A[0]; A[0] = B[0]; B[0] = s;
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if (low >= 8) { s = A[1]; A[1] = B[1]; B[1] = s;
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if (low == 12) {s = A[2]; A[2] = B[2]; B[2] = s;}}}
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}
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else {
|
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register char *t = a + size;
|
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do {s = *a; *a++ = *b; *b++ = s;} while (a < t);
|
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}
|
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}
|
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#define mmswap(a,b) mmswap_((a),(b),mmarg)
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|
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static void mmrot3_(a, b, c, mmarg)
|
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register char *a, *b, *c;
|
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int mmarg;
|
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{
|
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register int s;
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if (mmkind >= 0) {
|
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if (mmkind > 0) {
|
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register char *t = a + high;
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do {
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s = A[0]; A[0] = B[0]; B[0] = C[0]; C[0] = s;
|
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s = A[1]; A[1] = B[1]; B[1] = C[1]; C[1] = s;
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s = A[2]; A[2] = B[2]; B[2] = C[2]; C[2] = s;
|
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s = A[3]; A[3] = B[3]; B[3] = C[3]; C[3] = s; a += 16; b += 16; c += 16;
|
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} while (a < t);
|
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}
|
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if (low != 0) { s = A[0]; A[0] = B[0]; B[0] = C[0]; C[0] = s;
|
|
if (low >= 8) { s = A[1]; A[1] = B[1]; B[1] = C[1]; C[1] = s;
|
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if (low == 12) {s = A[2]; A[2] = B[2]; B[2] = C[2]; C[2] = s;}}}
|
|
}
|
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else {
|
|
register char *t = a + size;
|
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do {s = *a; *a++ = *b; *b++ = *c; *c++ = s;} while (a < t);
|
|
}
|
|
}
|
|
#define mmrot3(a,b,c) mmrot3_((a),(b),(c),mmarg)
|
|
|
|
/* qs6.c */
|
|
/*****************************************************/
|
|
/* */
|
|
/* qs6 (Quick sort function) */
|
|
/* */
|
|
/* by Tomoyuki Kawamura 1995.4.21 */
|
|
/* kawamura@tokuyama.ac.jp */
|
|
/*****************************************************/
|
|
|
|
typedef struct { char *LL, *RR; } stack_node; /* Stack structure for L,l,R,r */
|
|
#define PUSH(ll,rr) do { top->LL = (ll); top->RR = (rr); ++top; } while (0) /* Push L,l,R,r */
|
|
#define POP(ll,rr) do { --top; ll = top->LL; rr = top->RR; } while (0) /* Pop L,l,R,r */
|
|
|
|
#define med3(a,b,c) ((*cmp)(a,b,d)<0 ? \
|
|
((*cmp)(b,c,d)<0 ? b : ((*cmp)(a,c,d)<0 ? c : a)) : \
|
|
((*cmp)(b,c,d)>0 ? b : ((*cmp)(a,c,d)<0 ? a : c)))
|
|
|
|
void
|
|
ruby_qsort(void* base, const int nel, const int size,
|
|
int (*cmp)(const void*, const void*, void*), void *d)
|
|
{
|
|
register char *l, *r, *m; /* l,r:left,right group m:median point */
|
|
register int t, eq_l, eq_r; /* eq_l: all items in left group are equal to S */
|
|
char *L = base; /* left end of curren region */
|
|
char *R = (char*)base + size*(nel-1); /* right end of current region */
|
|
int chklim = 63; /* threshold of ordering element check */
|
|
stack_node stack[32], *top = stack; /* 32 is enough for 32bit CPU */
|
|
int mmkind, high, low;
|
|
|
|
if (nel <= 1) return; /* need not to sort */
|
|
mmprepare(base, size);
|
|
goto start;
|
|
|
|
nxt:
|
|
if (stack == top) return; /* return if stack is empty */
|
|
POP(L,R);
|
|
|
|
for (;;) {
|
|
start:
|
|
if (L + size == R) { /* 2 elements */
|
|
if ((*cmp)(L,R,d) > 0) mmswap(L,R); goto nxt;
|
|
}
|
|
|
|
l = L; r = R;
|
|
t = (r - l + size) / size; /* number of elements */
|
|
m = l + size * (t >> 1); /* calculate median value */
|
|
|
|
if (t >= 60) {
|
|
register char *m1;
|
|
register char *m3;
|
|
if (t >= 200) {
|
|
t = size*(t>>3); /* number of bytes in splitting 8 */
|
|
{
|
|
register char *p1 = l + t;
|
|
register char *p2 = p1 + t;
|
|
register char *p3 = p2 + t;
|
|
m1 = med3(p1, p2, p3);
|
|
p1 = m + t;
|
|
p2 = p1 + t;
|
|
p3 = p2 + t;
|
|
m3 = med3(p1, p2, p3);
|
|
}
|
|
}
|
|
else {
|
|
t = size*(t>>2); /* number of bytes in splitting 4 */
|
|
m1 = l + t;
|
|
m3 = m + t;
|
|
}
|
|
m = med3(m1, m, m3);
|
|
}
|
|
|
|
if ((t = (*cmp)(l,m,d)) < 0) { /*3-5-?*/
|
|
if ((t = (*cmp)(m,r,d)) < 0) { /*3-5-7*/
|
|
if (chklim && nel >= chklim) { /* check if already ascending order */
|
|
char *p;
|
|
chklim = 0;
|
|
for (p=l; p<r; p+=size) if ((*cmp)(p,p+size,d) > 0) goto fail;
|
|
goto nxt;
|
|
}
|
|
fail: goto loopA; /*3-5-7*/
|
|
}
|
|
if (t > 0) {
|
|
if ((*cmp)(l,r,d) <= 0) {mmswap(m,r); goto loopA;} /*3-5-4*/
|
|
mmrot3(r,m,l); goto loopA; /*3-5-2*/
|
|
}
|
|
goto loopB; /*3-5-5*/
|
|
}
|
|
|
|
if (t > 0) { /*7-5-?*/
|
|
if ((t = (*cmp)(m,r,d)) > 0) { /*7-5-3*/
|
|
if (chklim && nel >= chklim) { /* check if already ascending order */
|
|
char *p;
|
|
chklim = 0;
|
|
for (p=l; p<r; p+=size) if ((*cmp)(p,p+size,d) < 0) goto fail2;
|
|
while (l<r) {mmswap(l,r); l+=size; r-=size;} /* reverse region */
|
|
goto nxt;
|
|
}
|
|
fail2: mmswap(l,r); goto loopA; /*7-5-3*/
|
|
}
|
|
if (t < 0) {
|
|
if ((*cmp)(l,r,d) <= 0) {mmswap(l,m); goto loopB;} /*7-5-8*/
|
|
mmrot3(l,m,r); goto loopA; /*7-5-6*/
|
|
}
|
|
mmswap(l,r); goto loopA; /*7-5-5*/
|
|
}
|
|
|
|
if ((t = (*cmp)(m,r,d)) < 0) {goto loopA;} /*5-5-7*/
|
|
if (t > 0) {mmswap(l,r); goto loopB;} /*5-5-3*/
|
|
|
|
/* determining splitting type in case 5-5-5 */ /*5-5-5*/
|
|
for (;;) {
|
|
if ((l += size) == r) goto nxt; /*5-5-5*/
|
|
if (l == m) continue;
|
|
if ((t = (*cmp)(l,m,d)) > 0) {mmswap(l,r); l = L; goto loopA;}/*575-5*/
|
|
if (t < 0) {mmswap(L,l); l = L; goto loopB;} /*535-5*/
|
|
}
|
|
|
|
loopA: eq_l = 1; eq_r = 1; /* splitting type A */ /* left <= median < right */
|
|
for (;;) {
|
|
for (;;) {
|
|
if ((l += size) == r)
|
|
{l -= size; if (l != m) mmswap(m,l); l -= size; goto fin;}
|
|
if (l == m) continue;
|
|
if ((t = (*cmp)(l,m,d)) > 0) {eq_r = 0; break;}
|
|
if (t < 0) eq_l = 0;
|
|
}
|
|
for (;;) {
|
|
if (l == (r -= size))
|
|
{l -= size; if (l != m) mmswap(m,l); l -= size; goto fin;}
|
|
if (r == m) {m = l; break;}
|
|
if ((t = (*cmp)(r,m,d)) < 0) {eq_l = 0; break;}
|
|
if (t == 0) break;
|
|
}
|
|
mmswap(l,r); /* swap left and right */
|
|
}
|
|
|
|
loopB: eq_l = 1; eq_r = 1; /* splitting type B */ /* left < median <= right */
|
|
for (;;) {
|
|
for (;;) {
|
|
if (l == (r -= size))
|
|
{r += size; if (r != m) mmswap(r,m); r += size; goto fin;}
|
|
if (r == m) continue;
|
|
if ((t = (*cmp)(r,m,d)) < 0) {eq_l = 0; break;}
|
|
if (t > 0) eq_r = 0;
|
|
}
|
|
for (;;) {
|
|
if ((l += size) == r)
|
|
{r += size; if (r != m) mmswap(r,m); r += size; goto fin;}
|
|
if (l == m) {m = r; break;}
|
|
if ((t = (*cmp)(l,m,d)) > 0) {eq_r = 0; break;}
|
|
if (t == 0) break;
|
|
}
|
|
mmswap(l,r); /* swap left and right */
|
|
}
|
|
|
|
fin:
|
|
if (eq_l == 0) /* need to sort left side */
|
|
if (eq_r == 0) /* need to sort right side */
|
|
if (l-L < R-r) {PUSH(r,R); R = l;} /* sort left side first */
|
|
else {PUSH(L,l); L = r;} /* sort right side first */
|
|
else R = l; /* need to sort left side only */
|
|
else if (eq_r == 0) L = r; /* need to sort right side only */
|
|
else goto nxt; /* need not to sort both sides */
|
|
}
|
|
}
|
|
|
|
char *
|
|
ruby_strdup(const char *str)
|
|
{
|
|
char *tmp;
|
|
int len = strlen(str) + 1;
|
|
|
|
tmp = xmalloc(len);
|
|
memcpy(tmp, str, len);
|
|
|
|
return tmp;
|
|
}
|
|
|
|
char *
|
|
ruby_getcwd(void)
|
|
{
|
|
#ifdef HAVE_GETCWD
|
|
int size = 200;
|
|
char *buf = xmalloc(size);
|
|
|
|
while (!getcwd(buf, size)) {
|
|
if (errno != ERANGE) {
|
|
free(buf);
|
|
rb_sys_fail("getcwd");
|
|
}
|
|
size *= 2;
|
|
buf = xrealloc(buf, size);
|
|
}
|
|
#else
|
|
# ifndef PATH_MAX
|
|
# define PATH_MAX 8192
|
|
# endif
|
|
char *buf = xmalloc(PATH_MAX+1);
|
|
|
|
if (!getwd(buf)) {
|
|
free(buf);
|
|
rb_sys_fail("getwd");
|
|
}
|
|
#endif
|
|
return buf;
|
|
}
|
|
|
|
/* copyright notice for strtod implementation --
|
|
*
|
|
* Copyright (c) 1988-1993 The Regents of the University of California.
|
|
* Copyright (c) 1994 Sun Microsystems, Inc.
|
|
*
|
|
* Permission to use, copy, modify, and distribute this
|
|
* software and its documentation for any purpose and without
|
|
* fee is hereby granted, provided that the above copyright
|
|
* notice appear in all copies. The University of California
|
|
* makes no representations about the suitability of this
|
|
* software for any purpose. It is provided "as is" without
|
|
* express or implied warranty.
|
|
*
|
|
*/
|
|
|
|
#define MDMINEXPT DBL_MIN_EXP
|
|
#define MDMAXEXPT DBL_MAX_EXP
|
|
|
|
static const double powersOf10[] = { /* Table giving binary powers of 10. Entry */
|
|
10.0, /* is 10^2^i. Used to convert decimal */
|
|
100.0, /* exponents into floating-point numbers. */
|
|
1.0e4,
|
|
1.0e8,
|
|
1.0e16,
|
|
1.0e32,
|
|
1.0e64,
|
|
1.0e128,
|
|
1.0e256
|
|
};
|
|
|
|
/*
|
|
*----------------------------------------------------------------------
|
|
*
|
|
* strtod --
|
|
*
|
|
* This procedure converts a floating-point number from an ASCII
|
|
* decimal representation to internal double-precision format.
|
|
*
|
|
* Results:
|
|
* The return value is the double-precision floating-point
|
|
* representation of the characters in string. If endPtr isn't
|
|
* NULL, then *endPtr is filled in with the address of the
|
|
* next character after the last one that was part of the
|
|
* floating-point number.
|
|
*
|
|
* Side effects:
|
|
* None.
|
|
*
|
|
*----------------------------------------------------------------------
|
|
*/
|
|
|
|
double
|
|
ruby_strtod(
|
|
const char *string, /* A decimal ASCII floating-point number,
|
|
* optionally preceded by white space.
|
|
* Must have form "-I.FE-X", where I is the
|
|
* integer part of the mantissa, F is the
|
|
* fractional part of the mantissa, and X
|
|
* is the exponent. Either of the signs
|
|
* may be "+", "-", or omitted. Either I
|
|
* or F may be omitted, but both cannot be
|
|
* ommitted at once. The decimal
|
|
* point isn't necessary unless F is present.
|
|
* The "E" may actually be an "e". E and X
|
|
* may both be omitted (but not just one).
|
|
*/
|
|
char **endPtr) /* If non-NULL, store terminating character's
|
|
* address here. */
|
|
{
|
|
int sign, expSign = Qfalse;
|
|
double fraction = 0.0, dblExp;
|
|
const double *d;
|
|
register const char *p;
|
|
register int c;
|
|
int exp = 0; /* Exponent read from "EX" field. */
|
|
int fracExp = 0; /* Exponent that derives from the fractional
|
|
* part. Under normal circumstatnces, it is
|
|
* the negative of the number of digits in F.
|
|
* However, if I is very long, the last digits
|
|
* of I get dropped (otherwise a long I with a
|
|
* large negative exponent could cause an
|
|
* unnecessary overflow on I alone). In this
|
|
* case, fracExp is incremented one for each
|
|
* dropped digit. */
|
|
int mantSize = 0; /* Number of digits in mantissa. */
|
|
int hasPoint = Qfalse; /* Decimal point exists. */
|
|
int hasDigit = Qfalse; /* I or F exists. */
|
|
const char *pMant; /* Temporarily holds location of mantissa
|
|
* in string. */
|
|
const char *pExp; /* Temporarily holds location of exponent
|
|
* in string. */
|
|
|
|
/*
|
|
* Strip off leading blanks and check for a sign.
|
|
*/
|
|
|
|
errno = 0;
|
|
p = string;
|
|
while (ISSPACE(*p)) p++;
|
|
if (*p == '-') {
|
|
sign = Qtrue;
|
|
p++;
|
|
}
|
|
else {
|
|
if (*p == '+') p++;
|
|
sign = Qfalse;
|
|
}
|
|
|
|
fraction = 0.;
|
|
exp = 0;
|
|
|
|
/*
|
|
* Count the number of digits in the mantissa
|
|
* and also locate the decimal point.
|
|
*/
|
|
|
|
for ( ; (c = *p) != '\0'; p++) {
|
|
if (!ISDIGIT(c)) {
|
|
if (c != '.' || hasPoint || !ISDIGIT(p[1])) {
|
|
break;
|
|
}
|
|
hasPoint = Qtrue;
|
|
}
|
|
else {
|
|
if (hasPoint) { /* already in fractional part */
|
|
fracExp--;
|
|
}
|
|
if (mantSize) { /* already in mantissa */
|
|
mantSize++;
|
|
}
|
|
else if (c != '0') { /* have entered mantissa */
|
|
mantSize++;
|
|
pMant = p;
|
|
}
|
|
hasDigit = Qtrue;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Now suck up the digits in the mantissa. Use two integers to
|
|
* collect 9 digits each (this is faster than using floating-point).
|
|
* If the mantissa has more than 18 digits, ignore the extras, since
|
|
* they can't affect the value anyway.
|
|
*/
|
|
|
|
pExp = p;
|
|
if (mantSize) {
|
|
p = pMant;
|
|
}
|
|
if (mantSize > 18) {
|
|
fracExp += (mantSize - 18);
|
|
mantSize = 18;
|
|
}
|
|
if (!hasDigit) {
|
|
fraction = 0.0;
|
|
p = string;
|
|
}
|
|
else {
|
|
double frac1, frac2;
|
|
frac1 = 0;
|
|
for ( ; mantSize > 9; mantSize -= 1) {
|
|
c = *p;
|
|
p += 1;
|
|
if (c == '.') {
|
|
c = *p;
|
|
p += 1;
|
|
}
|
|
frac1 = 10*frac1 + (c - '0');
|
|
}
|
|
frac2 = 0;
|
|
for (; mantSize > 0; mantSize -= 1) {
|
|
c = *p;
|
|
p += 1;
|
|
if (c == '.') {
|
|
c = *p;
|
|
p += 1;
|
|
}
|
|
frac2 = 10*frac2 + (c - '0');
|
|
}
|
|
|
|
/*
|
|
* Skim off the exponent.
|
|
*/
|
|
|
|
p = pExp;
|
|
if ((*p == 'E') || (*p == 'e')) {
|
|
p++;
|
|
if (*p == '-') {
|
|
expSign = Qtrue;
|
|
p++;
|
|
}
|
|
else {
|
|
if (*p == '+') {
|
|
p++;
|
|
}
|
|
expSign = Qfalse;
|
|
}
|
|
if (ISDIGIT(*p)) {
|
|
do {
|
|
exp = exp * 10 + (*p++ - '0');
|
|
}
|
|
while (ISDIGIT(*p));
|
|
}
|
|
else {
|
|
p = pExp;
|
|
}
|
|
}
|
|
if (expSign) {
|
|
exp = fracExp - exp;
|
|
}
|
|
else {
|
|
exp = fracExp + exp;
|
|
}
|
|
|
|
/*
|
|
* Generate a floating-point number that represents the exponent.
|
|
* Do this by processing the exponent one bit at a time to combine
|
|
* many powers of 2 of 10. Then combine the exponent with the
|
|
* fraction.
|
|
*/
|
|
|
|
if (exp >= MDMAXEXPT) {
|
|
errno = ERANGE;
|
|
fraction = HUGE_VAL;
|
|
goto ret;
|
|
}
|
|
else if (exp < MDMINEXPT) {
|
|
errno = ERANGE;
|
|
fraction = 0.0;
|
|
goto ret;
|
|
}
|
|
fracExp = exp;
|
|
exp += 9;
|
|
if (exp < 0) {
|
|
expSign = Qtrue;
|
|
exp = -exp;
|
|
}
|
|
else {
|
|
expSign = Qfalse;
|
|
}
|
|
dblExp = 1.0;
|
|
for (d = powersOf10; exp != 0; exp >>= 1, d += 1) {
|
|
if (exp & 01) {
|
|
dblExp *= *d;
|
|
}
|
|
}
|
|
if (expSign) {
|
|
frac1 /= dblExp;
|
|
}
|
|
else {
|
|
frac1 *= dblExp;
|
|
}
|
|
exp = fracExp;
|
|
if (exp < 0) {
|
|
expSign = Qtrue;
|
|
exp = -exp;
|
|
}
|
|
else {
|
|
expSign = Qfalse;
|
|
}
|
|
dblExp = 1.0;
|
|
for (d = powersOf10; exp != 0; exp >>= 1, d += 1) {
|
|
if (exp & 01) {
|
|
dblExp *= *d;
|
|
}
|
|
}
|
|
if (expSign) {
|
|
frac2 /= dblExp;
|
|
}
|
|
else {
|
|
frac2 *= dblExp;
|
|
}
|
|
fraction = frac1 + frac2;
|
|
}
|
|
|
|
ret:
|
|
if (endPtr != NULL) {
|
|
*endPtr = (char *)p;
|
|
}
|
|
if (sign) {
|
|
return -fraction;
|
|
}
|
|
return fraction;
|
|
}
|