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Diffstat (limited to 'REORG.TODO/manual/examples/search.c')
-rw-r--r-- | REORG.TODO/manual/examples/search.c | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/REORG.TODO/manual/examples/search.c b/REORG.TODO/manual/examples/search.c new file mode 100644 index 0000000000..c434c11f8c --- /dev/null +++ b/REORG.TODO/manual/examples/search.c @@ -0,0 +1,113 @@ +/* Searching and Sorting Example + Copyright (C) 1991-2017 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or + modify it under the terms of the GNU General Public License + as published by the Free Software Foundation; either version 2 + of the License, or (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, if not, see <http://www.gnu.org/licenses/>. +*/ + +#include <stdlib.h> +#include <stdio.h> +#include <string.h> + +/* Define an array of critters to sort. */ + +struct critter + { + const char *name; + const char *species; + }; + +struct critter muppets[] = + { + {"Kermit", "frog"}, + {"Piggy", "pig"}, + {"Gonzo", "whatever"}, + {"Fozzie", "bear"}, + {"Sam", "eagle"}, + {"Robin", "frog"}, + {"Animal", "animal"}, + {"Camilla", "chicken"}, + {"Sweetums", "monster"}, + {"Dr. Strangepork", "pig"}, + {"Link Hogthrob", "pig"}, + {"Zoot", "human"}, + {"Dr. Bunsen Honeydew", "human"}, + {"Beaker", "human"}, + {"Swedish Chef", "human"} + }; + +int count = sizeof (muppets) / sizeof (struct critter); + + + +/* This is the comparison function used for sorting and searching. */ + +int +critter_cmp (const void *v1, const void *v2) +{ + const struct critter *c1 = v1; + const struct critter *c2 = v2; + + return strcmp (c1->name, c2->name); +} + + +/* Print information about a critter. */ + +void +print_critter (const struct critter *c) +{ + printf ("%s, the %s\n", c->name, c->species); +} + + +/*@group*/ +/* Do the lookup into the sorted array. */ + +void +find_critter (const char *name) +{ + struct critter target, *result; + target.name = name; + result = bsearch (&target, muppets, count, sizeof (struct critter), + critter_cmp); + if (result) + print_critter (result); + else + printf ("Couldn't find %s.\n", name); +} +/*@end group*/ + +/* Main program. */ + +int +main (void) +{ + int i; + + for (i = 0; i < count; i++) + print_critter (&muppets[i]); + printf ("\n"); + + qsort (muppets, count, sizeof (struct critter), critter_cmp); + + for (i = 0; i < count; i++) + print_critter (&muppets[i]); + printf ("\n"); + + find_critter ("Kermit"); + find_critter ("Gonzo"); + find_critter ("Janice"); + + return 0; +} |