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author | Brad Bishop <bradleyb@us.ibm.com> | 2014-06-30 22:10:16 -0500 |
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committer | Patrick Williams <iawillia@us.ibm.com> | 2014-07-02 22:49:29 -0500 |
commit | bf4630076762d9c20c16c80c1c791f352b046dd1 (patch) | |
tree | efc67bad010a28fd1abf5aeeefda2a969514fd97 /clib/src/array_iter.c | |
download | ffs-bf4630076762d9c20c16c80c1c791f352b046dd1.tar.gz ffs-bf4630076762d9c20c16c80c1c791f352b046dd1.zip |
Port FFS tools over from Building Block repository.
Diffstat (limited to 'clib/src/array_iter.c')
-rw-r--r-- | clib/src/array_iter.c | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/clib/src/array_iter.c b/clib/src/array_iter.c new file mode 100644 index 0000000..921bf97 --- /dev/null +++ b/clib/src/array_iter.c @@ -0,0 +1,180 @@ +/* + * Copyright (c) International Business Machines Corp., 2014 + * + * 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, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +/* + * File: array_iter.c + * Author: Shaun Wetzstein <shaun@us.ibm.com> + * Descr: dynamic array + * Note: + * Date: 10/22/10 + */ + +#include <unistd.h> +#include <stdarg.h> +#include <stdlib.h> +#include <malloc.h> +#include <stdint.h> +#include <stdio.h> +#include <string.h> +#include <errno.h> +#include <limits.h> + +#include "assert.h" +#include "misc.h" +#include "hash.h" +#include "nargs.h" +#include "array_iter.h" + +/* ======================================================================= */ + +const char *__array_iter_msg[] = { + "array_iter: unexpected NULL pointer", + "array_iter: index out-of-range", +}; + +#define ARRAY_ITER_NULL (__array_iter_msg[0]) +#define ARRAY_ITER_RANGE (__array_iter_msg[1]) + +/* ======================================================================= */ + +static inline const void *__array_iter_bwd(array_iter_t * self) +{ + size_t low = array_low(self->array); + const void *ret = NULL; + + if (low < self->idx) + self->idx--; + + while (low < self->idx) { + if (array_status(self->array, self->idx)) + break; + self->idx--; + } + + if (low < self->idx) + ret = array_at(self->array, self->idx); + + return ret; +} + +static inline const void *__array_iter_fwd(array_iter_t * self) +{ + size_t high = array_high(self->array); + const void *ret = NULL; + + if (self->idx < high) + self->idx++; + + while (self->idx < high) { + if (array_status(self->array, self->idx)) + break; + self->idx++; + } + + if (self->idx < high) + ret = array_at(self->array, self->idx); + + return ret; +} + +void array_iter_init(array_iter_t * self, array_t * array, uint32_t flags) +{ + if (unlikely(self == NULL)) + throw_unexpected(ARRAY_ITER_NULL); + if (unlikely(array == NULL)) + throw_unexpected(ARRAY_ITER_NULL); + + self->flags = flags; + self->array = array; + + if (self->flags & AI_FLAG_BWD) { + self->idx = array_high(self->array); + __array_iter_bwd(self); + } else { + self->idx = array_low(self->array); + __array_iter_fwd(self); + } +} + +void array_iter_clear(array_iter_t * self) +{ + if (unlikely(self == NULL)) + throw_unexpected(ARRAY_ITER_NULL); + + if (self->flags & AI_FLAG_BWD) + self->idx = array_high(self->array); + else + self->idx = array_low(self->array); + + self->array = NULL; +} + +const void *array_iter_elem(array_iter_t * self) +{ + if (unlikely(self == NULL)) + throw_unexpected(ARRAY_ITER_NULL); + if (self->idx < array_low(self->array)) + throw_unexpected(ARRAY_ITER_RANGE); + if (array_high(self->array) <= self->idx) + throw_unexpected(ARRAY_ITER_RANGE); + + return array_status(self->array, self->idx) ? + array_at(self->array, self->idx) : NULL; +} + +const void *array_iter_inc1(array_iter_t * self) +{ + return array_iter_inc2(self, 1); +} + +const void *array_iter_inc2(array_iter_t * self, size_t inc) +{ + if (unlikely(self == NULL)) + throw_unexpected(ARRAY_ITER_NULL); + + const void *ret = NULL; + + if (self->flags & AI_FLAG_BWD) + ret = __array_iter_bwd(self); + else + ret = __array_iter_fwd(self); + + return ret; +} + +const void *array_iter_dec1(array_iter_t * self) +{ + return array_iter_dec2(self, 1); +} + +const void *array_iter_dec2(array_iter_t * self, size_t dec) +{ + if (unlikely(self == NULL)) + throw_unexpected(ARRAY_ITER_NULL); + + const void *ret = NULL; + + if (self->flags & AI_FLAG_BWD) + ret = __array_iter_fwd(self); + else + ret = __array_iter_bwd(self); + + return ret; +} + +/* ======================================================================= */ |