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Diffstat (limited to '')
| -rw-r--r-- | lib/vector.c | 212 |
1 files changed, 212 insertions, 0 deletions
diff --git a/lib/vector.c b/lib/vector.c new file mode 100644 index 0000000..bbea67c --- /dev/null +++ b/lib/vector.c @@ -0,0 +1,212 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* Generic vector interface routine + * Copyright (C) 1997 Kunihiro Ishiguro + */ + +#include <zebra.h> + +#include "vector.h" +#include "memory.h" + +DEFINE_MTYPE_STATIC(LIB, VECTOR, "Vector"); +DEFINE_MTYPE_STATIC(LIB, VECTOR_INDEX, "Vector index"); + +/* Initialize vector : allocate memory and return vector. */ +vector vector_init(unsigned int size) +{ + vector v = XCALLOC(MTYPE_VECTOR, sizeof(struct _vector)); + + /* allocate at least one slot */ + if (size == 0) + size = 1; + + v->alloced = size; + v->active = 0; + v->count = 0; + v->index = XCALLOC(MTYPE_VECTOR_INDEX, sizeof(void *) * size); + return v; +} + +void vector_free(vector v) +{ + XFREE(MTYPE_VECTOR_INDEX, v->index); + XFREE(MTYPE_VECTOR, v); +} + +vector vector_copy(vector v) +{ + unsigned int size; + vector new = XCALLOC(MTYPE_VECTOR, sizeof(struct _vector)); + + new->active = v->active; + new->alloced = v->alloced; + new->count = v->count; + + size = sizeof(void *) * (v->alloced); + new->index = XCALLOC(MTYPE_VECTOR_INDEX, size); + memcpy(new->index, v->index, size); + + return new; +} + +/* Check assigned index, and if it runs short double index pointer */ +void vector_ensure(vector v, unsigned int num) +{ + if (v->alloced > num) + return; + + v->index = XREALLOC(MTYPE_VECTOR_INDEX, v->index, + sizeof(void *) * (v->alloced * 2)); + memset(&v->index[v->alloced], 0, sizeof(void *) * v->alloced); + v->alloced *= 2; + + if (v->alloced <= num) + vector_ensure(v, num); +} + +/* This function only returns next empty slot index. It dose not mean + the slot's index memory is assigned, please call vector_ensure() + after calling this function. */ +int vector_empty_slot(vector v) +{ + unsigned int i; + + if (v->active == v->count) + return v->active; + + if (v->active == 0) + return 0; + + for (i = 0; i < v->active; i++) + if (v->index[i] == 0) + return i; + + return i; +} + +/* Set value to the smallest empty slot. */ +int vector_set(vector v, void *val) +{ + unsigned int i; + + i = vector_empty_slot(v); + vector_ensure(v, i); + + if (v->index[i]) + v->count--; + if (val) + v->count++; + v->index[i] = val; + + if (v->active <= i) + v->active = i + 1; + + return i; +} + +/* Set value to specified index slot. */ +int vector_set_index(vector v, unsigned int i, void *val) +{ + vector_ensure(v, i); + + if (v->index[i]) + v->count--; + if (val) + v->count++; + v->index[i] = val; + + if (v->active <= i) + v->active = i + 1; + + return i; +} + +/* Look up vector. */ +void *vector_lookup(vector v, unsigned int i) +{ + if (i >= v->active) + return NULL; + return v->index[i]; +} + +/* Lookup vector, ensure it. */ +void *vector_lookup_ensure(vector v, unsigned int i) +{ + vector_ensure(v, i); + return v->index[i]; +} + +/* Unset value at specified index slot. */ +void vector_unset(vector v, unsigned int i) +{ + if (i >= v->alloced) + return; + + if (v->index[i]) + v->count--; + + v->index[i] = NULL; + + if (i + 1 == v->active) { + v->active--; + while (i && v->index[--i] == NULL && v->active--) + ; /* Is this ugly ? */ + } +} + +void vector_remove(vector v, unsigned int ix) +{ + if (ix >= v->active) + return; + + if (v->index[ix]) + v->count--; + + int n = (--v->active) - ix; + + memmove(&v->index[ix], &v->index[ix + 1], n * sizeof(void *)); + v->index[v->active] = NULL; +} + +void vector_compact(vector v) +{ + for (unsigned int i = 0; i < vector_active(v); ++i) { + if (vector_slot(v, i) == NULL) { + vector_remove(v, i); + --i; + } + } +} + +void vector_unset_value(vector v, void *val) +{ + size_t i; + + for (i = 0; i < v->active; i++) + if (v->index[i] == val) { + v->index[i] = NULL; + v->count--; + break; + } + + if (i + 1 == v->active) + do + v->active--; + while (i && v->index[--i] == NULL); +} + +void vector_to_array(vector v, void ***dest, int *argc) +{ + *dest = XCALLOC(MTYPE_TMP, sizeof(void *) * v->active); + memcpy(*dest, v->index, sizeof(void *) * v->active); + *argc = v->active; +} + +vector array_to_vector(void **src, int argc) +{ + vector v = vector_init(VECTOR_MIN_SIZE); + + for (int i = 0; i < argc; i++) + vector_set_index(v, i, src[i]); + return v; +} |