strsep: check for availability (Solaris support)

Solaris does not ship a version of the strsep() function.  This change
adds a check to "configure" to see whether notmuch needs to provide its
own implementation, and if so, it uses the new version in
"compat/strsep.c" (which was copied from Mutt, and apparently before
that from glibc).

Signed-off-by: Vladimir Marek <vlmarek@volny.cz>

1 files changed, 65 insertions, 0 deletions

diff --git a/compat/strsep.c b/compat/strsep.c
new file mode 100644
index 00000000..78ab9e71
--- /dev/null
+++ b/compat/strsep.c
@@ -0,0 +1,65 @@
+/* Copyright (C) 1992, 93, 96, 97, 98, 99, 2004 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   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 <string.h>
+
+/* Taken from glibc 2.6.1 */
+
+char *strsep (char **stringp, const char *delim)
+{
+  char *begin, *end;
+
+  begin = *stringp;
+  if (begin == NULL)
+    return NULL;
+
+  /* A frequent case is when the delimiter string contains only one
+     character.  Here we don't need to call the expensive `strpbrk'
+     function and instead work using `strchr'.  */
+  if (delim[0] == '\0' || delim[1] == '\0')
+    {
+      char ch = delim[0];
+
+      if (ch == '\0')
+	end = NULL;
+      else
+	{
+	  if (*begin == ch)
+	    end = begin;
+	  else if (*begin == '\0')
+	    end = NULL;
+	  else
+	    end = strchr (begin + 1, ch);
+	}
+    }
+  else
+    /* Find the end of the token.  */
+    end = strpbrk (begin, delim);
+
+  if (end)
+    {
+      /* Terminate the token and set *STRINGP past NUL character.  */
+      *end++ = '\0';
+      *stringp = end;
+    }
+  else
+    /* No more delimiters; this is the last token.  */
+    *stringp = NULL;
+
+  return begin;
+}