qsort(3)qsort(3)NAMEqsort - Sort a table in place
SYNOPSIS
#include <stdlib.h>
void qsort(
void *base,
size_t nmemb,
size_t size,
int (*compar)(const void *, const void *) );
LIBRARY
Standard C Library (libc)
STANDARDS
Interfaces documented on this reference page conform to industry stan‐
dards as follows:
qsort(): XPG4, XPG4-UNIX
Refer to the standards(5) reference page for more information about
industry standards and associated tags.
PARAMETERS
Points to the first entry in the table. Specifies the number of
entries in the table. Specifies the size in bytes of each table entry.
Points to the user-specified function to be used to compare pairs of
table elements. The comparison function will be called with two parame‐
ters that point to the two elements to be compared. The comparison
function must return an integer less than, equal to, or greater than
zero, depending on whether the first element in the comparison is con‐
sidered less than, equal to, or greater than the second element.
DESCRIPTION
The qsort() function sorts a table having a specified number of
entries. The contents of the table are sorted in ascending order
according to a user-specified comparison function (the strcmp() func‐
tion, for example).
NOTES
The comparison function need not compare every byte, so arbitrary data
may be contained in the elements in addition to the values being com‐
pared.
When two members compare equal, their order in the sorted array is
indeterminate.
SEE ALSO
Functions: bsearch(3)lsearch(3)
Standards: standards(5)qsort(3)
