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LSEARCH(3) Linux Programmer's Manual LSEARCH(3)
NAME
lfind, lsearch - linear search of an array
SYNOPSIS
#include <search.h>
void *lfind(const void *key, const void *base, size_t *nmemb,
size_t size, int(*compar)(const void *, const void *));
void *lsearch(const void *key, void *base, size_t *nmemb,
size_t size, int(*compar)(const void *, const void *));
DESCRIPTION
lfind() and lsearch() perform a linear search for key in the array base which has *nmemb elements of size bytes each. The comparison function referenced by com‐
par is expected to have two arguments which point to the key object and to an array member, in that order, and which returns zero if the key object matches the
array member, and nonzero otherwise.
If lsearch() does not find a matching element, then the key object is inserted at the end of the table, and *nmemb is incremented. In particular, one should
know that a matching element exists, or that more room is available.
RETURN VALUE
lfind() returns a pointer to a matching member of the array, or NULL if no match is found. lsearch() returns a pointer to a matching member of the array, or to
the newly added member if no match is found.
ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7).
┌──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┬───────────────┬─────────┐
│Interface │ Attribute │ Value │
├──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┼───────────────┼─────────┤
│lfind(), lsearch() │ Thread safety │ MT-Safe │
└──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┴───────────────┴─────────┘
CONFORMING TO
POSIX.1-2001, POSIX.1-2008, SVr4, 4.3BSD. Present in libc since libc-4.6.27.
BUGS
The naming is unfortunate.
SEE ALSO
bsearch(3), hsearch(3), tsearch(3)
GNU 2021-03-22 LSEARCH(3)