ENH: Added C String utilities to KWSys. Implemented strcasecmp and strncasecmp.

1 files changed, 107 insertions, 0 deletions

diff --git a/Source/kwsys/String.c b/Source/kwsys/String.c
new file mode 100644
index 0000000000..1aade1261c
--- /dev/null
+++ b/Source/kwsys/String.c
@@ -0,0 +1,107 @@
+/*=========================================================================
+
+  Program:   KWSys - Kitware System Library
+  Module:    $RCSfile$
+
+  Copyright (c) Kitware, Inc., Insight Consortium.  All rights reserved.
+  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
+
+     This software is distributed WITHOUT ANY WARRANTY; without even
+     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+     PURPOSE.  See the above copyright notices for more information.
+
+=========================================================================*/
+#include "kwsysPrivate.h"
+#include KWSYS_HEADER(String.h)
+
+/* Work-around CMake dependency scanning limitation.  This must
+   duplicate the above list of headers.  */
+#if 0
+# include "String.h.in"
+#endif
+
+/* Select an implementation for strcasecmp.  */
+#if defined(_MSC_VER)
+# define KWSYS_STRING_USE_STRICMP
+# include <string.h>
+#elif defined(__GNUC__)
+# define KWSYS_STRING_USE_STRCASECMP
+# include <strings.h>
+#else
+/* Table to convert upper case letters to lower case and leave all
+   other characters alone.  */
+static char kwsysString_strcasecmp_tolower[] =
+{
+  '\000', '\001', '\002', '\003', '\004', '\005', '\006', '\007',
+  '\010', '\011', '\012', '\013', '\014', '\015', '\016', '\017',
+  '\020', '\021', '\022', '\023', '\024', '\025', '\026', '\027',
+  '\030', '\031', '\032', '\033', '\034', '\035', '\036', '\037',
+  '\040', '\041', '\042', '\043', '\044', '\045', '\046', '\047',
+  '\050', '\051', '\052', '\053', '\054', '\055', '\056', '\057',
+  '\060', '\061', '\062', '\063', '\064', '\065', '\066', '\067',
+  '\070', '\071', '\072', '\073', '\074', '\075', '\076', '\077',
+  '\100', '\141', '\142', '\143', '\144', '\145', '\146', '\147',
+  '\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157',
+  '\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167',
+  '\170', '\171', '\172', '\133', '\134', '\135', '\136', '\137',
+  '\140', '\141', '\142', '\143', '\144', '\145', '\146', '\147',
+  '\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157',
+  '\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167',
+  '\170', '\171', '\172', '\173', '\174', '\175', '\176', '\177',
+  '\200', '\201', '\202', '\203', '\204', '\205', '\206', '\207',
+  '\210', '\211', '\212', '\213', '\214', '\215', '\216', '\217',
+  '\220', '\221', '\222', '\223', '\224', '\225', '\226', '\227',
+  '\230', '\231', '\232', '\233', '\234', '\235', '\236', '\237',
+  '\240', '\241', '\242', '\243', '\244', '\245', '\246', '\247',
+  '\250', '\251', '\252', '\253', '\254', '\255', '\256', '\257',
+  '\260', '\261', '\262', '\263', '\264', '\265', '\266', '\267',
+  '\270', '\271', '\272', '\273', '\274', '\275', '\276', '\277',
+  '\300', '\301', '\302', '\303', '\304', '\305', '\306', '\307',
+  '\310', '\311', '\312', '\313', '\314', '\315', '\316', '\317',
+  '\320', '\321', '\322', '\323', '\324', '\325', '\326', '\327',
+  '\330', '\331', '\332', '\333', '\334', '\335', '\336', '\337',
+  '\340', '\341', '\342', '\343', '\344', '\345', '\346', '\347',
+  '\350', '\351', '\352', '\353', '\354', '\355', '\356', '\357',
+  '\360', '\361', '\362', '\363', '\364', '\365', '\366', '\367',
+  '\370', '\371', '\372', '\373', '\374', '\375', '\376', '\377'
+};
+#endif
+
+/*--------------------------------------------------------------------------*/
+int kwsysString_strcasecmp(const char* lhs, const char* rhs)
+{
+#if defined(KWSYS_STRING_USE_STRICMP)
+  return _stricmp(lhs, rhs);
+#elif defined(KWSYS_STRING_USE_STRCASECMP)
+  return strcasecmp(lhs, rhs);
+#else
+  const char* const lower = kwsysString_strcasecmp_tolower;
+  unsigned char const* us1 = (unsigned char const*)lhs;
+  unsigned char const* us2 = (unsigned char const*)rhs;
+  int result = 0;
+  while((result = lower[*us1] - lower[*us2++], result == 0) && *us1++)
+    {
+    }
+  return result;
+#endif
+}
+
+/*--------------------------------------------------------------------------*/
+int kwsysString_strncasecmp(const char* lhs, const char* rhs, size_t n)
+{
+#if defined(KWSYS_STRING_USE_STRICMP)
+  return _strnicmp(lhs, rhs, n);
+#elif defined(KWSYS_STRING_USE_STRCASECMP)
+  return strncasecmp(lhs, rhs, n);
+#else
+  const char* const lower = kwsysString_strcasecmp_tolower;
+  unsigned char const* us1 = (unsigned char const*)lhs;
+  unsigned char const* us2 = (unsigned char const*)rhs;
+  int result = 0;
+  while(n && (result = lower[*us1] - lower[*us2++], result == 0) && *us1++)
+    {
+    --n;
+    }
+  return result;
+#endif
+}