diff options
Diffstat (limited to 'misc')
| -rw-r--r-- | misc/Makefile | 2 | ||||
| -rw-r--r-- | misc/insremque.c | 22 | ||||
| -rw-r--r-- | misc/tst-insremque.c | 61 |
3 files changed, 77 insertions, 8 deletions
diff --git a/misc/Makefile b/misc/Makefile index 63b6d413b3..f9ad0b76fc 100644 --- a/misc/Makefile +++ b/misc/Makefile @@ -78,7 +78,7 @@ endif gpl2lgpl := error.c error.h tests := tst-dirname tst-tsearch tst-fdset tst-efgcvt tst-mntent tst-hsearch \ - tst-error1 tst-pselect + tst-error1 tst-pselect tst-insremque ifeq (no,$(cross-compiling)) tests: $(objpfx)tst-error1-mem endif diff --git a/misc/insremque.c b/misc/insremque.c index e366ac8063..7f086cd392 100644 --- a/misc/insremque.c +++ b/misc/insremque.c @@ -1,4 +1,4 @@ -/* Copyright (C) 1992, 1995, 1996 Free Software Foundation, Inc. +/* Copyright (C) 1992, 1995, 1996, 2006 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or @@ -24,12 +24,20 @@ void insque (void *elem, void *prev) { - struct qelem *next = ((struct qelem *) prev)->q_forw; - ((struct qelem *) prev)->q_forw = (struct qelem *) elem; - if (next != NULL) - next->q_back = (struct qelem *) elem; - ((struct qelem *) elem)->q_forw = next; - ((struct qelem *) elem)->q_back = (struct qelem *) prev; + if (prev == NULL) + { + ((struct qelem *) elem)->q_forw = NULL; + ((struct qelem *) elem)->q_back = NULL; + } + else + { + struct qelem *next = ((struct qelem *) prev)->q_forw; + ((struct qelem *) prev)->q_forw = (struct qelem *) elem; + if (next != NULL) + next->q_back = (struct qelem *) elem; + ((struct qelem *) elem)->q_forw = next; + ((struct qelem *) elem)->q_back = (struct qelem *) prev; + } } /* Unlink ELEM from the doubly-linked list that it is in. */ diff --git a/misc/tst-insremque.c b/misc/tst-insremque.c new file mode 100644 index 0000000000..9f17055ef5 --- /dev/null +++ b/misc/tst-insremque.c @@ -0,0 +1,61 @@ +#include <search.h> +#include <stdio.h> +#include <string.h> + +#define CHECK(cond) \ + do \ + if (! (cond)) \ + { \ + printf ("Condition " #cond " not true on line %d\n", __LINE__); \ + ret = 1; \ + } \ + while (0) + +static int +do_test (void) +{ + struct qelem elements[4]; + int ret = 0; + + /* Linear list. */ + memset (elements, 0xff, sizeof (elements)); + insque (&elements[0], NULL); + remque (&elements[0]); + insque (&elements[0], NULL); + insque (&elements[2], &elements[0]); + insque (&elements[1], &elements[0]); + insque (&elements[3], &elements[2]); + remque (&elements[2]); + insque (&elements[2], &elements[0]); + CHECK (elements[0].q_back == NULL); + CHECK (elements[0].q_forw == &elements[2]); + CHECK (elements[1].q_back == &elements[2]); + CHECK (elements[1].q_forw == &elements[3]); + CHECK (elements[2].q_back == &elements[0]); + CHECK (elements[2].q_forw == &elements[1]); + CHECK (elements[3].q_back == &elements[1]); + CHECK (elements[3].q_forw == NULL); + + /* Circular list. */ + memset (elements, 0xff, sizeof (elements)); + elements[0].q_back = &elements[0]; + elements[0].q_forw = &elements[0]; + insque (&elements[2], &elements[0]); + insque (&elements[1], &elements[0]); + insque (&elements[3], &elements[2]); + remque (&elements[2]); + insque (&elements[2], &elements[0]); + CHECK (elements[0].q_back == &elements[3]); + CHECK (elements[0].q_forw == &elements[2]); + CHECK (elements[1].q_back == &elements[2]); + CHECK (elements[1].q_forw == &elements[3]); + CHECK (elements[2].q_back == &elements[0]); + CHECK (elements[2].q_forw == &elements[1]); + CHECK (elements[3].q_back == &elements[1]); + CHECK (elements[3].q_forw == &elements[0]); + + return ret; +} + +#define TEST_FUNCTION do_test () +#include "../test-skeleton.c" |