diff options
Diffstat (limited to 'contrib/csup/attrstack.c')
-rw-r--r-- | contrib/csup/attrstack.c | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/contrib/csup/attrstack.c b/contrib/csup/attrstack.c new file mode 100644 index 0000000..f5f56b3 --- /dev/null +++ b/contrib/csup/attrstack.c @@ -0,0 +1,90 @@ +/*- + * Copyright (c) 2006, Maxime Henrion <mux@FreeBSD.org> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * $Id$ + */ + +#include <assert.h> +#include <stdlib.h> + +#include "attrstack.h" +#include "fattr.h" +#include "misc.h" + +#define ATTRSTACK_DEFSIZE 16 /* Initial size of the stack. */ + +struct attrstack { + struct fattr **stack; + size_t cur; + size_t size; +}; + +struct attrstack * +attrstack_new(void) +{ + struct attrstack *as; + + as = xmalloc(sizeof(struct attrstack)); + as->stack = xmalloc(sizeof(struct fattr *) * ATTRSTACK_DEFSIZE); + as->size = ATTRSTACK_DEFSIZE; + as->cur = 0; + return (as); +} + +struct fattr * +attrstack_pop(struct attrstack *as) +{ + + assert(as->cur > 0); + return (as->stack[--as->cur]); +} + +void +attrstack_push(struct attrstack *as, struct fattr *fa) +{ + + if (as->cur >= as->size) { + as->size *= 2; + as->stack = xrealloc(as->stack, + sizeof(struct fattr *) * as->size); + } + as->stack[as->cur++] = fa; +} + +size_t +attrstack_size(struct attrstack *as) +{ + + return (as->cur); +} + +void +attrstack_free(struct attrstack *as) +{ + + assert(as->cur == 0); + free(as->stack); + free(as); +} |