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strnatcmp.h

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+/* -*- mode: c; c-file-style: "k&r" -*-
+
+  strnatcmp.c -- Perform 'natural order' comparisons of strings in C.
+  Copyright (C) 2000, 2004 by Martin Pool <mbp sourcefrog net>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+
+/***********************************************************************
+ * Now let's make some changes:
+ * 
+ * 1. std::string support
+ * 2. usable with std::sort and std::vectors
+ * 
+ * ********************************************************************/
+
+#ifndef __STRNATCMP_HPP
+#define __STRNATCMP_HPP
+
+#include <cstddef>	/* size_t */
+#include <cctype>
+#include <string>
+
+typedef char nat_char;
+
+int strnatcmp(nat_char const *a, nat_char const *b);
+int strnatcasecmp(nat_char const *a, nat_char const *b);
+
+
+static inline int nat_isdigit(nat_char a){
+     return isdigit((unsigned char) a);
+}
+
+
+static inline int nat_isspace(nat_char a){
+     return isspace((unsigned char) a);
+}
+
+
+static inline nat_char nat_toupper(nat_char a){
+     return toupper((unsigned char) a);
+}
+
+
+static int compare_right(nat_char const *a, nat_char const *b){
+     int bias = 0;
+     
+     /* The longest run of digits wins.  That aside, the greatest
+	value wins, but we can't know that it will until we've scanned
+	both numbers to know that they have the same magnitude, so we
+	remember it in BIAS. */
+     for (;; a++, b++) {
+	  if (!nat_isdigit(*a)  &&  !nat_isdigit(*b))
+	       return bias;
+	  if (!nat_isdigit(*a))
+	       return -1;
+	  if (!nat_isdigit(*b))
+	       return +1;
+	  if (*a < *b) {
+	       if (!bias)
+		    bias = -1;
+	  } else if (*a > *b) {
+	       if (!bias)
+		    bias = +1;
+	  } else if (!*a  &&  !*b)
+	       return bias;
+     }
+
+     return 0;
+}
+
+
+static int compare_left(nat_char const *a, nat_char const *b){
+     /* Compare two left-aligned numbers: the first to have a
+        different value wins. */
+     for (;; a++, b++) {
+	  if (!nat_isdigit(*a)  &&  !nat_isdigit(*b))
+	       return 0;
+	  if (!nat_isdigit(*a))
+	       return -1;
+	  if (!nat_isdigit(*b))
+	       return +1;
+	  if (*a < *b)
+	       return -1;
+	  if (*a > *b)
+	       return +1;
+     }
+
+     return 0;
+}
+
+
+static int strnatcmp0(nat_char const *a, nat_char const *b, int fold_case){
+     int ai, bi;
+     nat_char ca, cb;
+     int fractional, result;
+
+     ai = bi = 0;
+     while (1) {
+	  ca = a[ai]; cb = b[bi];
+
+	  /* skip over leading spaces or zeros */
+	  while (nat_isspace(ca))
+	       ca = a[++ai];
+
+	  while (nat_isspace(cb))
+	       cb = b[++bi];
+
+	  /* process run of digits */
+	  if (nat_isdigit(ca)  &&  nat_isdigit(cb)) {
+	       fractional = (ca == '0' || cb == '0');
+
+	       if (fractional) {
+		    if ((result = compare_left(a+ai, b+bi)) != 0)
+			 return result;
+	       } else {
+		    if ((result = compare_right(a+ai, b+bi)) != 0)
+			 return result;
+	       }
+	  }
+
+	  if (!ca && !cb) {
+	       /* The strings compare the same.  Perhaps the caller
+                  will want to call strcmp to break the tie. */
+	       return 0;
+	  }
+
+	  if (fold_case) {
+	       ca = nat_toupper(ca);
+	       cb = nat_toupper(cb);
+	  }
+
+	  if (ca < cb)
+	       return -1;
+
+	  if (ca > cb)
+	       return +1;
+
+	  ++ai; ++bi;
+     }
+}
+
+/*The following doesn't consider case of string*/
+int strnatcmp(nat_char const *a, nat_char const *b) {
+     return strnatcmp0(a, b, 0);
+}
+
+
+/* Compare, recognizing numeric string and ignoring case.
+ * This one is the general case where lower-case and upper-
+ * case are considered as same.
+ *  */
+int strnatcasecmp(nat_char const *a, nat_char const *b) {
+     return strnatcmp0(a, b, 1);
+}
+
+//You can use this function with std::sort and vector
+bool compareNat(const std::string& a,const std::string& b){
+    if(strnatcasecmp(a.c_str(),b.c_str())==-1) return true;
+    else return false;
+    }
+
+//You can use this function with qsort
+int compareNatq(const void *a, const void *b){
+    char const *pa = *(char const **)a, *pb = *(char const **)b;
+    return strnatcasecmp(pa, pb);
+}
+
+
+#endif