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BSEARCH(3)                 Linux Programmer's Manual                BSEARCH(3)

       bsearch - binary search of a sorted array

       #include <stdlib.h>

       void *bsearch(const void *key, const void *base,
                     size_t nmemb, size_t size,
                     int (*compar)(const void *, const void *));

       The  bsearch() function searches an array of nmemb objects, the initial
       member of which is pointed to by base, for a member  that  matches  the
       object  pointed  to  by  key.   The size of each member of the array is
       specified by size.

       The contents of the array should be in ascending sorted order according
       to the comparison function referenced by compar.  The compar routine is
       expected to have two arguments which point to the key object and to  an
       array  member,  in  that order, and should return an integer less than,
       equal to, or greater than zero if the  key  object  is  found,  respec-
       tively, to be less than, to match, or be greater than the array member.

       The  bsearch()  function  returns a pointer to a matching member of the
       array, or NULL if no match is found.  If there  are  multiple  elements
       that match the key, the element returned is unspecified.

       SVr4, 4.3BSD, POSIX.1-2001, C89, C99.

       The  example  below  first sorts an array of structures using qsort(3),
       then retrieves desired elements using bsearch().

       #include <stdio.h>
       #include <stdlib.h>
       #include <string.h>

       struct mi {
           int nr;
           char *name;
       } months[] = {
           { 1, "jan" }, { 2, "feb" }, { 3, "mar" }, { 4, "apr" },
           { 5, "may" }, { 6, "jun" }, { 7, "jul" }, { 8, "aug" },
           { 9, "sep" }, {10, "oct" }, {11, "nov" }, {12, "dec" }

       #define nr_of_months (sizeof(months)/sizeof(months[0]))

       static int
       compmi(const void *m1, const void *m2)
           struct mi *mi1 = (struct mi *) m1;
           struct mi *mi2 = (struct mi *) m2;
           return strcmp(mi1->name, mi2->name);

       main(int argc, char **argv)
           int i;

           qsort(months, nr_of_months, sizeof(struct mi), compmi);
           for (i = 1; i < argc; i++) {
               struct mi key, *res;
      = argv[i];
               res = bsearch(&key, months, nr_of_months,
                             sizeof(struct mi), compmi);
               if (res == NULL)
                   printf("'%s': unknown month\n", argv[i]);
                   printf("%s: month #%d\n", res->name, res->nr);

       hsearch(3), lsearch(3), qsort(3), tsearch(3)

       This page is part of release 3.74 of the Linux  man-pages  project.   A
       description  of  the project, information about reporting bugs, and the
       latest    version    of    this    page,    can     be     found     at

                                  2003-11-01                        BSEARCH(3)

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