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Index: lib/libc/stdlib/bsearch.3
===================================================================
--- lib/libc/stdlib/bsearch.3
+++ lib/libc/stdlib/bsearch.3
@@ -93,26 +93,28 @@
#include <string.h>
struct person {
- char name[5];
- int age;
+ const char *name;
+ int age;
};
int
-compare(const void *key, const void *array_member)
+compare(const void *a, const void *b)
{
- int age = (intptr_t) key;
- struct person person = *(struct person *) array_member;
+ int age;
+ struct person person_b;
- return (age - person.age);
+ age = *(const int *)a;
+ person_b = *(const struct person *)b;
+
+ return (age - person_b.age);
}
int
-main()
+main(void)
{
struct person *friend;
-
/* Sorted array */
- struct person friends[6] = {
+ const struct person friends[] = {
{ "paul", 22 },
{ "anne", 25 },
{ "fred", 25 },
@@ -121,21 +123,27 @@
{ "bill", 50 }
};
- size_t array_size = sizeof(friends) / sizeof(struct person);
+ const size_t len = sizeof(friends) / sizeof(friends[0]);
- friend = bsearch((void *)22, &friends, array_size, sizeof(struct person), compare);
+ int age = 22;
+ friend = bsearch(&age, friends, len, sizeof(friends[0]), compare);
assert(strcmp(friend->name, "paul") == 0);
printf("name: %s\enage: %d\en", friend->name, friend->age);
- friend = bsearch((void *)25, &friends, array_size, sizeof(struct person), compare);
+ age = 25;
+ friend = bsearch(&age, friends, len, sizeof(friends[0]), compare);
+
+ /*
+ * For multiple elements with the same key, it is implementation
+ * defined which will be returned
+ */
assert(strcmp(friend->name, "fred") == 0 || strcmp(friend->name, "anne") == 0);
printf("name: %s\enage: %d\en", friend->name, friend->age);
- friend = bsearch((void *)30, &friends, array_size, sizeof(struct person), compare);
+ age = 30;
+ friend = bsearch(&age, friends, len, sizeof(friends[0]), compare);
assert(friend == NULL);
printf("friend aged 30 not found\en");
-
- return (EXIT_SUCCESS);
}
.Ed
.Sh SEE ALSO

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