[vlc-commits] Add strverscmp from glibc 2.14.1 to compat.

[Antoine Cellerier]

vlc | branch: master | Antoine Cellerier <dionoea at videolan.org> | Sat Feb  4 17:39:01 2012 +0100| [44432d8f51b5af1bd7f08c02ce0a5cb911260faf] | committer: Antoine Cellerier

Add strverscmp from glibc 2.14.1 to compat.

> http://git.videolan.org/gitweb.cgi/vlc.git/?a=commit;h=44432d8f51b5af1bd7f08c02ce0a5cb911260faf
---

 compat/strverscmp.c  |  105 ++++++++++++++++++++++++++++++++++++++++++++++++++
 configure.ac         |    2 +-
 include/vlc_fixups.h |    4 ++
 3 files changed, 110 insertions(+), 1 deletions(-)

diff --git a/compat/strverscmp.c b/compat/strverscmp.c
new file mode 100644
index 0000000..0487592
--- /dev/null
+++ b/compat/strverscmp.c
@@ -0,0 +1,105 @@
+/* Compare strings while treating digits characters numerically.
+   Copyright (C) 1997, 2002, 2009 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Jean-François Bignolles <bignolle at 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 Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <stdint.h>
+#include <string.h>
+#include <ctype.h>
+
+/* states: S_N: normal, S_I: comparing integral part, S_F: comparing
+           fractionnal parts, S_Z: idem but with leading Zeroes only */
+#define  S_N    0x0
+#define  S_I    0x3
+#define  S_F    0x6
+#define  S_Z    0x9
+
+/* result_type: CMP: return diff; LEN: compare using len_diff/diff */
+#define  CMP    2
+#define  LEN    3
+
+
+/* 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 (const char *s1, const char *s2)
+{
+  const unsigned char *p1 = (const unsigned char *) s1;
+  const unsigned char *p2 = (const unsigned char *) s2;
+
+  /* Symbol(s)    0       [1-9]   others
+     Transition   (10) 0  (01) d  (00) x   */
+  static const uint8_t next_state[] =
+  {
+      /* state    x    d    0  */
+      /* S_N */  S_N, S_I, S_Z,
+      /* S_I */  S_N, S_I, S_I,
+      /* S_F */  S_N, S_F, S_F,
+      /* S_Z */  S_N, S_F, S_Z
+  };
+
+  static const int8_t result_type[] =
+  {
+      /* state   x/x  x/d  x/0  d/x  d/d  d/0  0/x  0/d  0/0  */
+
+      /* S_N */  CMP, CMP, CMP, CMP, LEN, CMP, CMP, CMP, CMP,
+      /* S_I */  CMP, -1,  -1,  +1,  LEN, LEN, +1,  LEN, LEN,
+      /* S_F */  CMP, CMP, CMP, CMP, CMP, CMP, CMP, CMP, CMP,
+      /* S_Z */  CMP, +1,  +1,  -1,  CMP, CMP, -1,  CMP, CMP
+  };
+
+  if (p1 == p2)
+    return 0;
+
+  unsigned char c1 = *p1++;
+  unsigned char c2 = *p2++;
+  /* Hint: '0' is a digit too.  */
+  int state = S_N + ((c1 == '0') + (isdigit (c1) != 0));
+
+  int diff;
+  while ((diff = c1 - c2) == 0)
+    {
+      if (c1 == '\0')
+	return diff;
+
+      state = next_state[state];
+      c1 = *p1++;
+      c2 = *p2++;
+      state += (c1 == '0') + (isdigit (c1) != 0);
+    }
+
+  state = result_type[state * 3 + (((c2 == '0') + (isdigit (c2) != 0)))];
+
+  switch (state)
+  {
+    case CMP:
+      return diff;
+
+    case LEN:
+      while (isdigit (*p1++))
+	if (!isdigit (*p2++))
+	  return 1;
+
+      return isdigit (*p2) ? -1 : diff;
+
+    default:
+      return state;
+  }
+}
diff --git a/configure.ac b/configure.ac
index bf9fc3f..51f5656 100644
--- a/configure.ac
+++ b/configure.ac
@@ -491,7 +491,7 @@ need_libc=false
 dnl Check for usual libc functions
 AC_CHECK_DECLS([nanosleep],,,[#include <time.h>])
 AC_CHECK_FUNCS([daemon fcntl fstatvfs fork getenv getpwuid_r if_nameindex if_nametoindex isatty lstat memalign mmap openat pread posix_fadvise posix_madvise setlocale stricmp strnicmp strptime uselocale])
-AC_REPLACE_FUNCS([atof atoll dirfd fdopendir flockfile fsync getdelim getpid gmtime_r inet_pton lldiv localtime_r nrand48 poll rewind setenv strcasecmp strcasestr strdup strlcpy strncasecmp strndup strnlen strsep strtof strtok_r strtoll swab tdestroy])
+AC_REPLACE_FUNCS([atof atoll dirfd fdopendir flockfile fsync getdelim getpid gmtime_r inet_pton lldiv localtime_r nrand48 poll rewind setenv strcasecmp strcasestr strdup strlcpy strncasecmp strndup strnlen strsep strtof strtok_r strtoll swab tdestroy strverscmp])
 AC_CHECK_FUNCS(fdatasync,,
   [AC_DEFINE(fdatasync, fsync, [Alias fdatasync() to fsync() if missing.])
 ])
diff --git a/include/vlc_fixups.h b/include/vlc_fixups.h
index a78750b..9b6ac21 100644
--- a/include/vlc_fixups.h
+++ b/include/vlc_fixups.h
@@ -118,6 +118,10 @@ char *strdup (const char *);
 int strncasecmp (const char *, const char *, size_t);
 #endif
 
+#ifndef HAVE_STRVERSCMP
+int strverscmp (const char *, const char *);
+#endif
+
 #ifndef HAVE_STRNLEN
 size_t strnlen (const char *, size_t);
 #endif