commit - 733ef4c81519fe89ae3faa5320469f35e3a5cc0f
commit + ebbf92898e749da9341ebe3b7e71b96362161043
blob - /dev/null
blob + 8b83c2c4ba767b52034f35bfb6be4d83ba8f15f4 (mode 644)
--- /dev/null
+++ src/ngircd/array.c
+/*
+ * 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.
+ * Please read the file COPYING, README and AUTHORS for more information.
+ *
+ * functions to dynamically allocate arrays.
+ * Copyright (c) 2005 Florian Westphal (westphal@foo.fh-furtwangen.de)
+ *
+ */
+
+#include "array.h"
+
+static char UNUSED id[] = "$Id: array.c,v 1.1 2005/07/07 18:38:14 fw Exp $";
+
+#include <assert.h>
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "log.h"
+
+#define array_UNUSABLE(x) ( ! x->mem || (0 == x->allocated) )
+
+#define ALIGN_32U(x) ((x | 0x1fU) +1)
+#define ALIGN_1024U(x) ((x | 0x3ffU) +1)
+#define ALIGN_4096U(x) ((x | 0xfffU) +1)
+
+
+static int
+safemult_uint(unsigned int a, unsigned int b, unsigned int *res)
+{
+ unsigned int tmp;
+
+ if (!a || !b) {
+ *res = 0;
+ return 1;
+ }
+
+ tmp = a * b;
+
+ if (tmp / b != a)
+ return 0;
+
+ *res = tmp;
+ return 1;
+}
+
+
+/* if realloc() fails, array_alloc return NULL. otherwise return pointer to elem pos in array */
+void *
+array_alloc(array * a, unsigned int size, unsigned int pos)
+{
+ unsigned int alloc, pos_plus1 = pos + 1;
+ unsigned int aligned = 0;
+ char *tmp;
+
+ assert(size);
+
+ if (pos_plus1 < pos)
+ return NULL;
+
+ if (!safemult_uint(size, pos_plus1, &alloc))
+ return NULL;
+
+ if (a->allocated < alloc) {
+ if (alloc < 128) {
+ aligned = ALIGN_32U(alloc);
+ } else {
+ if (alloc < 4096) {
+ aligned = ALIGN_1024U(alloc);
+ } else {
+ aligned = ALIGN_4096U(alloc);
+ }
+ }
+#ifdef DEBUG
+ Log(LOG_DEBUG, "Rounded %u to %u byte.", alloc, aligned);
+#endif
+
+ assert(aligned >= alloc);
+
+ if (aligned < alloc) /* rounding overflow */
+ return NULL;
+
+ alloc = aligned;
+#ifdef DEBUG
+ Log(LOG_DEBUG, "array_alloc: changing size from %u to %u byte",
+ a->allocated, aligned);
+#endif
+
+ tmp = realloc(a->mem, alloc);
+ if (!tmp)
+ return NULL;
+
+ a->mem = tmp;
+ a->allocated = alloc;
+
+ assert(a->allocated > a->used);
+
+ memset(a->mem + a->used, 0, a->allocated - a->used);
+
+ a->used = alloc;
+ }
+ return a->mem + (pos * size);
+}
+
+
+/*return number of initialized ELEMS in a. */
+unsigned int
+array_length(const array * const a, unsigned int membersize)
+{
+ assert(a);
+ assert(membersize);
+
+ if (array_UNUSABLE(a))
+ return 0;
+
+ return membersize ? a->used / membersize : 0;
+}
+
+
+/* copy array src to array dest */
+bool
+array_copy(array * dest, const array * const src)
+{
+ if (array_UNUSABLE(src))
+ return false;
+
+ return array_copyb(dest, src->mem, src->used);
+}
+
+
+/* return false if we could not append src (realloc failure, invalid src/dest array) */
+bool
+array_copyb(array * dest, const char *src, unsigned int len)
+{
+ assert(dest);
+ assert(src);
+
+ if (!len || !src)
+ return true;
+
+ if (!array_alloc(dest, 1, len))
+ return false;
+
+ dest->used = len;
+ memcpy(dest->mem, src, len);
+#ifdef DEBUG
+ Log(LOG_DEBUG,
+ "array_copyb: copied %u bytes to array (%u total bytes allocated)",
+ len, dest->allocated);
+#endif
+ return true;
+}
+
+
+/* copy string to dest */
+bool
+array_copys(array * dest, const char *src)
+{
+ return array_copyb(dest, src, strlen(src));
+}
+
+
+/* append len bytes from src to the array dest.
+return false if we could not append all bytes (realloc failure, invalid src/dest array) */
+bool
+array_catb(array * dest, const char *src, unsigned int len)
+{
+ unsigned int tmp;
+ unsigned int used;
+ char *ptr;
+
+ assert(dest);
+ assert(src);
+
+ if (!len)
+ return true;
+
+ if (!src || !dest)
+ return false;
+
+ used = dest->used;
+ tmp = used + len;
+
+ if (tmp < used || tmp < len) /* integer overflow */
+ return false;
+
+ if (!array_alloc(dest, 1, tmp))
+ return false;
+
+ ptr = dest->mem;
+
+ assert(ptr);
+
+#ifdef DEBUG
+ Log(LOG_DEBUG,
+ "array_catb: appending %u bytes to array (now %u total bytes in array)",
+ len, tmp);
+#endif
+ memcpy(ptr + used, src, len);
+ dest->used = tmp;
+ return true;
+}
+
+
+/* append string to dest */
+bool
+array_cats(array * dest, const char *src)
+{
+ return array_catb(dest, src, strlen(src));
+}
+
+
+/* append trailing NUL byte to array */
+bool
+array_cat0(array * a)
+{
+ return array_catb(a, "", 1);
+}
+
+
+/* add contents of array src to array dest. */
+bool
+array_cat(array * dest, const array * const src)
+{
+ if (array_UNUSABLE(src))
+ return false;
+
+ return array_catb(dest, src->mem, src->used);
+}
+
+
+/* return pointer to the element at pos.
+ return NULL if the array is unallocated, or if pos is larger than
+ the number of elements stored int the array. */
+void *
+array_get(array * a, unsigned int membersize, unsigned int pos)
+{
+ unsigned int totalsize;
+
+ assert(membersize);
+ assert(a);
+
+ if (array_UNUSABLE(a))
+ return NULL;
+
+ if (!safemult_uint(pos, membersize, &totalsize))
+ return NULL;
+
+ if (a->allocated < totalsize)
+ return NULL;
+
+ return a->mem + pos * membersize;
+}
+
+
+void
+array_free(array * a)
+{
+ assert(a);
+#ifdef DEBUG
+ Log(LOG_DEBUG,
+ "array_free: %u bytes free'd (%u bytes still used at time of free())",
+ a->allocated, a->used);
+#endif
+ free(a->mem);
+ a->mem = NULL;
+ a->allocated = 0;
+ a->used = 0;
+}
+
+
+void
+array_free_wipe(array * a)
+{
+ if (!array_UNUSABLE(a))
+ memset(a->mem, 0, a->allocated);
+
+ array_free(a);
+}
+
+
+void *
+array_start(const array * const a)
+{
+ assert(a);
+ return a->mem;
+}
+
+
+void
+array_trunc(array * a)
+{
+ assert(a);
+ a->used = 0;
+}
+
+
+void
+array_truncate(array * a, unsigned int membersize, unsigned int len)
+{
+ unsigned int newlen;
+ assert(a);
+ if (!safemult_uint(membersize, len, &newlen))
+ return;
+
+ if (newlen <= a->allocated)
+ a->used = newlen;
+}
+
+
+/* move elements starting at pos to beginning of array */
+void
+array_moveleft(array * a, unsigned int membersize, unsigned int pos)
+{
+ unsigned int bytepos;
+
+ assert(a);
+ assert(membersize);
+
+ if (!pos)
+ return;
+
+ if (!safemult_uint(membersize, pos, &bytepos)) {
+ a->used = 0;
+ return;
+ }
+
+ if (!bytepos)
+ return; /* nothing to do */
+
+#ifdef DEBUG
+ Log(LOG_DEBUG,
+ "array_moveleft: %u used bytes in array, move to beginning, starting at pos %u",
+ a->used, bytepos);
+#endif
+ if (a->used <= bytepos) {
+ a->used = 0;
+ return;
+ }
+
+ a->used -= bytepos;
+ memmove(a->mem, a->mem + bytepos, a->used);
+}
+
+/* -eof- */
blob - /dev/null
blob + 7a7e0d830c91d91323835575d68cb317e837ae45 (mode 644)
--- /dev/null
+++ src/ngircd/array.h
+/*
+ * 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.
+ * Please read the file COPYING, README and AUTHORS for more information.
+ *
+ * libarray - dynamically allocate arrays.
+ * Copyright (c) 2005 Florian Westphal (westphal@foo.fh-furtwangen.de)
+ *
+ * $Id: array.h,v 1.1 2005/07/07 18:38:14 fw Exp $
+ */
+
+#ifndef array_h_included
+#define array_h_included
+
+#include "portab.h"
+
+typedef struct {
+ char * mem;
+ unsigned int allocated;
+ unsigned int used;
+} array;
+
+/* allocated: mem != NULL, used >= 0 && used <= allocated, allocated > 0
+ unallocated: mem == NULL, allocated == 0, used == 0 */
+
+
+#define array_unallocated(x) (array_bytes(x)==0)
+#define INIT_ARRAY { NULL, 0, 0 }
+
+/* allocates space for at least nmemb+1 elements of size bytes each.
+ return pointer to elem at pos, or NULL if realloc() fails */
+extern void * array_alloc PARAMS((array *a, unsigned int size, unsigned int pos));
+
+/* returns the number of initialized BYTES in a. */
+#define array_bytes(array) ( (array)->used )
+
+/* returns the number of initialized ELEMS in a. */
+extern unsigned int array_length PARAMS((const array* const a, unsigned int elemsize));
+
+/* _copy functions: copy src to dest.
+return true if OK, else false. (e.g. realloc failure, invalid src/dest array, ..)
+In that case dest is left unchanged. */
+
+/* copy array src to dest */
+extern bool array_copy PARAMS((array* dest, const array* const src));
+
+/* copy len bytes from src to array dest. */
+extern bool array_copyb PARAMS((array* dest, const char* src, unsigned int len));
+
+/* copy string to dest */
+extern bool array_copys PARAMS((array* dest, const char* src));
+
+/* _cat functions: append src to dest.
+return true if OK, else false. (e.g. realloc failure, invalid src/dest array, ..)
+In that case dest is left unchanged. */
+
+/* append len bytes from src to array dest. */
+extern bool array_catb PARAMS((array* dest, const char* src, unsigned int len));
+
+/* append string to dest */
+extern bool array_cats PARAMS((array* dest, const char* src));
+
+/* append NUL byte to dest */
+extern bool array_cat0 PARAMS((array* dest));
+
+/* append contents of array src to array dest. */
+extern bool array_cat PARAMS((array* dest, const array* const src));
+
+/* return pointer to element at pos.
+ return NULL if the array is unallocated or if pos is larger than the number
+ of elements stored int the array. */
+extern void* array_get PARAMS((array* a, unsigned int membersize, unsigned int pos));
+
+/* free the contents of this array. */
+extern void array_free PARAMS((array* a));
+
+/* overwrite array with zeroes before free */
+extern void array_free_wipe PARAMS((array* a));
+
+/* return pointer to first element in this array */
+extern void* array_start PARAMS((const array* const a));
+
+/* reset this array (the memory is not free'd */
+extern void array_trunc PARAMS((array* a));
+
+/* set number of used elements in this array to len */
+extern void array_truncate PARAMS((array* a, unsigned int membersize, unsigned int len));
+
+/* move elements starting at pos to beginning of array */
+extern void array_moveleft PARAMS((array* a, unsigned int membersize, unsigned int pos));
+
+#endif
+/* -eof- */
