---
name: "wncmp"
section: "3"
platform: "linux"
package: "libwn-dev"
version: "6.0-17"
release: "Debian 4.0 (Etch)"
platforms: ["linux"]
url: "https://new.carta.tech/wncmp"
---

# wncmp(3)

comparison functions for sorting and sorted trees.

## NAME

wn\_intcmp, wn\_ptrcmp, cmp, wn\_boolcmp, wn\_doublecmp, wn\_pdoublecmp, wn\_numstrcmp - comparison functions for sorting and sorted trees.

## SYNOPSIS

```
#include <wn/wncmp.h>

int wn_intcmp(int i1,int i2)

int wn_ptrcmp(ptr p1,ptr p2)

int wn_ptrNULLcmp(bool *success,ptr p1,ptr p2)

int wn_boolcmp(bool b1,bool b2)

int wn_doublecmp(double d1,double d2)

int wn_pdoublecmp(double *pd1,double *pd2)

int wn_numstrcmp(char s1[],s2[])

```

## DESCRIPTION

These routines are designed to assist in sorting (see [wn\_sort\_sll(3)](/wn_sort_sll/3.md)) and in building sorted trees (see [wn\_mkbtree(3)](/wn_mkbtree/3.md)).  They return an int \>, ==, or \< than zero, according to whether arg 1 is \>, ==, or \< than arg 2.

**wn\_numstrcmp** compares strings **s1** that *s2* so that the intuitively correct notion of numerical order is respected.  Thus, the string "var9" is \< "var10", according to **wn\_numstrcmp**. Similarly, "var99" \< "var100", "x99y" \< "x200y", etc.

**wn\_ptrNULLcmp** sets *success* to **TRUE** iff *p1* or *p2* is **NULL**. If *p1* and *p2* are **NULL**, it returns 0.  If *p1* is **NULL** but *p2* is not **NULL**, it returns a number \< 0.  If *p1* is not **NULL** but *p2* is **NULL**, it returns a number \> 0.  This function is useful for constructing complicated linked structure compares where it is possible for some pointers to be **NULL**.

## SEE ALSO

wnsort "(3), " wnbtr "(3), " wnbtrl "(3), " wnhtbl "(3), " wncpy (3)

## AUTHOR

Will Naylor