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49 lines
1.6 KiB
C
49 lines
1.6 KiB
C
/*
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FUNCTION
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<<qsort_r>>---sort an array
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INDEX
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qsort_r
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SYNOPSIS
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#define _BSD_SOURCE
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#include <stdlib.h>
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void qsort_r(void *<[base]>, size_t <[nmemb]>, size_t <[size]>,
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void *<[thunk]>,
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int (*<[compar]>)(void*, const void *, const void *));
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#define _GNU_SOURCE
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#include <stdlib.h>
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void qsort_r(void *<[base]>, size_t <[nmemb]>, size_t <[size]>,
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int (*<[compar]>)(const void *, const void *, void *),
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void *<[thunk]>);
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DESCRIPTION
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<<qsort_r>> sorts an array (beginning at <[base]>) of <[nmemb]> objects.
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<[size]> describes the size of each element of the array.
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You must supply a pointer to a comparison function, using the argument
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shown as <[compar]>. (This permits sorting objects of unknown
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properties.) There are two forms of this function, in each the
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comparison function is defined to accept three arguments, but in a
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different order. Two are pointers to an element of the array starting at
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<[base]>, and another being an arbitrary pointer <[thunk]>. The
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result of <<(*<[compar]>)>> must be negative if the first argument is
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less than the second, zero if the two arguments match, and positive if
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the first argument is greater than the second (where ``less than'' and
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``greater than'' refer to whatever arbitrary ordering is appropriate).
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The array is sorted in place; that is, when <<qsort_r>> returns, the
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array elements beginning at <[base]> have been reordered.
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RETURNS
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<<qsort_r>> does not return a result.
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PORTABILITY
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<<qsort_r>>, in various forms, appears in both BSD and glibc.
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*/
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#define _GNU_SOURCE
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#define I_AM_GNU_QSORT_R
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#include "qsort.c"
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