maint: update copyright

[gnulib.git] / lib / strverscmp.c

diff --git a/lib/strverscmp.c b/lib/strverscmp.c
index b3926f2..e9fba93 100644 (file)
--- a/lib/strverscmp.c
+++ b/lib/strverscmp.c
@@ -1,24 +1,23 @@
 /* Compare strings while treating digits characters numerically.
-   Copyright (C) 1997 Free Software Foundation, Inc.
+   Copyright (C) 1997, 2000, 2002, 2004, 2006, 2009-2014 Free Software
+   Foundation, Inc.
    This file is part of the GNU C Library.
-   Contributed by Jean-Francois Bignolles <bignolle@ecoledoc.ibp.fr>, 1997.
+   Contributed by Jean-François Bignolles <bignolle@ecoledoc.ibp.fr>, 1997.
 
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Library General Public License as
-   published by the Free Software Foundation; either version 2 of the
-   License, or (at your option) any later version.
+   This program 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.
 
-   The GNU C Library is distributed in the hope that it will be useful,
+   This program 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
-   Library General Public License for more details.
+   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 Library General Public
-   License along with the GNU C Library; see the file COPYING.LIB.  If not,
-   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-   Boston, MA 02111-1307, USA.  */
+   You should have received a copy of the GNU General Public License along
+   with this program; if not, see <http://www.gnu.org/licenses/>.  */
 
-#if HAVE_CONFIG_H
+#if !_LIBC
 # include <config.h>
 #endif
 
@@ -26,7 +25,7 @@
 #include <ctype.h>
 
 /* states: S_N: normal, S_I: comparing integral part, S_F: comparing
-           Fractional parts, S_Z: idem but with leading Zeroes only */
+           fractional parts, S_Z: idem but with leading Zeroes only */
 #define S_N    0x0
 #define S_I    0x4
 #define S_F    0x8
@@ -37,15 +36,29 @@
 #define LEN    3
 
 
+/* ISDIGIT differs from isdigit, as follows:
+   - Its arg may be any int or unsigned int; it need not be an unsigned char
+     or EOF.
+   - It's typically faster.
+   POSIX says that only '0' through '9' are digits.  Prefer ISDIGIT to
+   isdigit unless it's important to use the locale's definition
+   of "digit" even when the host does not conform to POSIX.  */
+#define ISDIGIT(c) ((unsigned int) (c) - '0' <= 9)
+
+#undef __strverscmp
+#undef strverscmp
+
+#ifndef weak_alias
+# define __strverscmp strverscmp
+#endif
+
 /* Compare S1 and S2 as strings holding indices/version numbers,
    returning less than, equal to or greater than zero if S1 is less than,
    equal to or greater than S2 (for more info, see the texinfo doc).
 */
 
 int
-strverscmp (s1, s2)
-     const char *s1;
-     const char *s2;
+__strverscmp (const char *s1, const char *s2)
 {
   const unsigned char *p1 = (const unsigned char *) s1;
   const unsigned char *p2 = (const unsigned char *) s2;
@@ -71,11 +84,11 @@ strverscmp (s1, s2)
 
       /* S_N */  CMP, CMP, CMP, CMP, CMP, LEN, CMP, CMP,
                  CMP, CMP, CMP, CMP, CMP, CMP, CMP, CMP,
-      /* S_I */  CMP, -1,  -1,  CMP, +1,  LEN, LEN, CMP,
-                 +1,  LEN, LEN, CMP, CMP, CMP, CMP, CMP,
+      /* S_I */  CMP, -1,  -1,  CMP,  1,  LEN, LEN, CMP,
+                  1,  LEN, LEN, CMP, CMP, CMP, CMP, CMP,
       /* S_F */  CMP, CMP, CMP, CMP, CMP, LEN, CMP, CMP,
                  CMP, CMP, CMP, CMP, CMP, CMP, CMP, CMP,
-      /* S_Z */  CMP, +1,  +1,  CMP, -1,  CMP, CMP, CMP,
+      /* S_Z */  CMP,  1,   1,  CMP, -1,  CMP, CMP, CMP,
                  -1,  CMP, CMP, CMP
   };
 
@@ -85,17 +98,17 @@ strverscmp (s1, s2)
   c1 = *p1++;
   c2 = *p2++;
   /* Hint: '0' is a digit too.  */
-  state = S_N | ((c1 == '0') + (isdigit (c1) != 0));
+  state = S_N | ((c1 == '0') + (ISDIGIT (c1) != 0));
 
   while ((diff = c1 - c2) == 0 && c1 != '\0')
     {
       state = next_state[state];
       c1 = *p1++;
       c2 = *p2++;
-      state |= (c1 == '0') + (isdigit (c1) != 0);
+      state |= (c1 == '0') + (ISDIGIT (c1) != 0);
     }
 
-  state = result_type[state << 2 | ((c2 == '0') + (isdigit (c2) != 0))];
+  state = result_type[state << 2 | ((c2 == '0') + (ISDIGIT (c2) != 0))];
 
   switch (state)
     {
@@ -103,13 +116,16 @@ strverscmp (s1, s2)
       return diff;
 
     case LEN:
-      while (isdigit (*p1++))
-       if (!isdigit (*p2++))
-         return 1;
+      while (ISDIGIT (*p1++))
+        if (!ISDIGIT (*p2++))
+          return 1;
 
-      return isdigit (*p2) ? -1 : diff;
+      return ISDIGIT (*p2) ? -1 : diff;
 
     default:
       return state;
     }
 }
+#ifdef weak_alias
+weak_alias (__strverscmp, strverscmp)
+#endif