Add ascii_strcasecmp() and ascii_strncasecmp() functions which do

locale-independent and case-insensitive string comparisons.  Needed
for mutt to work in iso-8859-9 environments, where tolower('I') !=
'i'.

1 files changed, 97 insertions, 0 deletions

diff --git a/ascii.c b/ascii.c
new file mode 100644
index 00000000..d4553f68
--- /dev/null
+++ b/ascii.c
@@ -0,0 +1,97 @@
+/*
+ * Copyright (C) 2001 Thomas Roessler <roessler@does-not-exist.org>
+ * 
+ *     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 of the License, or (at your option) any later
+ *     version.
+ * 
+ *     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 General Public License for more
+ *     details.
+ * 
+ *     You should have received a copy of the GNU General Public
+ *     License along with this program; if not, write to the Free
+ *     Software Foundation, Inc., 59 Temple Place - Suite 330,
+ *     Boston, MA 02111, USA.
+ * 
+ */
+
+
+/* 
+ * Versions of the string comparison functions which are
+ * locale-insensitive.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include "ascii.h"
+
+int ascii_isupper (int c)
+{
+  return (c >= 'A') && (c <= 'Z');
+}
+
+int ascii_islower (int c)
+{
+  return (c >= 'a') && (c <= 'z');
+}
+
+int ascii_toupper (int c)
+{
+  if (ascii_islower (c))
+    return c & ~32;
+  
+  return c;
+}
+
+int ascii_tolower (int c)
+{
+  if (ascii_isupper (c))
+    return c | 32;
+  
+  return c;
+}
+
+int ascii_strcasecmp (const char *a, const char *b)
+{
+  int i;
+  
+  if (a == b)
+    return 0;
+  if (a == NULL && b)
+    return -1;
+  if (b == NULL && a)
+    return 1;
+  
+  for (; *a || *b; a++, b++)
+  {
+    if ((i = ascii_tolower (*a) - ascii_tolower (*b)))
+      return i;
+  }
+  
+  return 0;
+}
+
+int ascii_strncasecmp (const char *a, const char *b, int n)
+{
+  int i, j;
+  
+  if (a == b)
+    return 0;
+  if (a == NULL && b)
+    return -1;
+  if (b == NULL && a)
+    return 1;
+  
+  for (j = 0; (*a || *b) && j < n; a++, b++, j++)
+  {
+    if ((i = ascii_tolower (*a) - ascii_tolower (*b)))
+      return i;
+  }
+  
+  return 0;
+}