Diffstat (limited to 'libical/src/libical/icalmemory.c') (more/less context) (ignore whitespace changes)
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diff --git a/libical/src/libical/icalmemory.c b/libical/src/libical/icalmemory.c new file mode 100644 index 0000000..297ead8 --- a/dev/null +++ b/libical/src/libical/icalmemory.c @@ -0,0 +1,287 @@ +/* -*- Mode: C -*- + ====================================================================== + FILE: icalmemory.c + CREATOR: eric 30 June 1999 + + $Id$ + $Locker$ + + The contents of this file are subject to the Mozilla Public License + Version 1.0 (the "License"); you may not use this file except in + compliance with the License. You may obtain a copy of the License at + http://www.mozilla.org/MPL/ + + Software distributed under the License is distributed on an "AS IS" + basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See + the License for the specific language governing rights and + limitations under the License. + + + This program is free software; you can redistribute it and/or modify + it under the terms of either: + + The LGPL as published by the Free Software Foundation, version + 2.1, available at: http://www.fsf.org/copyleft/lesser.html + + Or: + + The Mozilla Public License Version 1.0. You may obtain a copy of + the License at http://www.mozilla.org/MPL/ + + The Original Code is icalmemory.h + + ======================================================================*/ + +/* libical often passes strings back to the caller. To make these + * interfaces simple, I did not want the caller to have to pass in a + * memory buffer, but having libical pass out newly allocated memory + * makes it difficult to de-allocate the memory. + * + * The ring buffer in this scheme makes it possible for libical to pass + * out references to memory which the caller does not own, and be able + * to de-allocate the memory later. The ring allows libical to have + * several buffers active simultaneously, which is handy when creating + * string representations of components. */ + +#define ICALMEMORY_C + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#ifdef DMALLOC +#include "dmalloc.h" +#endif + +#include "icalmemory.h" +#include "icalerror.h" + +#include <stdio.h> /* for printf (debugging) */ +#include <stdlib.h> /* for malloc, realloc */ +#include <string.h> /* for memset(), strdup */ + +#define BUFFER_RING_SIZE 25 +#define MIN_BUFFER_SIZE 200 + +void icalmemory_free_tmp_buffer (void* buf); + + +/* HACK. Not threadsafe */ +void* buffer_ring[BUFFER_RING_SIZE]; +int buffer_pos = -1; +int initialized = 0; + +/* Add an existing buffer to the buffer ring */ +void icalmemory_add_tmp_buffer(void* buf) +{ + /* I don't think I need this -- I think static arrays are + initialized to 0 as a standard part of C, but I am not sure. */ + if (initialized == 0){ + int i; + for(i=0; i<BUFFER_RING_SIZE; i++){ + buffer_ring[i] = 0; + } + initialized = 1; + } + + /* Wrap around the ring */ + if(++buffer_pos == BUFFER_RING_SIZE){ + buffer_pos = 0; + } + + /* Free buffers as their slots are overwritten */ + if ( buffer_ring[buffer_pos] != 0){ + free( buffer_ring[buffer_pos]); + buffer_ring[buffer_pos] = 0; + } + + /* Assign the buffer to a slot */ + buffer_ring[buffer_pos] = buf; +} + +/* Create a new temporary buffer on the ring. Libical owns these and + wil deallocate them. */ +void* +icalmemory_tmp_buffer (size_t size) +{ + char *buf; + + if (size < MIN_BUFFER_SIZE){ + size = MIN_BUFFER_SIZE; + } + + buf = (void*)malloc(size); + + if( buf == 0){ + icalerror_set_errno(ICAL_NEWFAILED_ERROR); + return 0; + } + + memset(buf,0,size); + + icalmemory_add_tmp_buffer(buf); + + return buf; +} + +void icalmemory_free_ring() +{ + + int i; + for(i=0; i<BUFFER_RING_SIZE; i++){ + if ( buffer_ring[i] != 0){ + free( buffer_ring[i]); + } + buffer_ring[i] = 0; + } + + initialized = 1; + +} + + + +/* Like strdup, but the buffer is on the ring. */ +char* +icalmemory_tmp_copy(const char* str) +{ + char* b = icalmemory_tmp_buffer(strlen(str)+1); + + strcpy(b,str); + + return b; +} + + +char* icalmemory_strdup(const char *s) +{ + return strdup(s); +} + +void +icalmemory_free_tmp_buffer (void* buf) +{ + if(buf == 0) + { + return; + } + + free(buf); +} + + +/* These buffer routines create memory the old fashioned way -- so the + caller will have to delocate the new memory */ + +void* icalmemory_new_buffer(size_t size) +{ + void *b = malloc(size); + + if( b == 0){ + icalerror_set_errno(ICAL_NEWFAILED_ERROR); + return 0; + } + + memset(b,0,size); + + return b; +} + +void* icalmemory_resize_buffer(void* buf, size_t size) +{ + void *b = realloc(buf, size); + + if( b == 0){ + icalerror_set_errno(ICAL_NEWFAILED_ERROR); + return 0; + } + + return b; +} + +void icalmemory_free_buffer(void* buf) +{ + free(buf); +} + +void +icalmemory_append_string(char** buf, char** pos, size_t* buf_size, + const char* string) +{ + char *new_buf; + char *new_pos; + + size_t data_length, final_length, string_length; + +#ifndef ICAL_NO_INTERNAL_DEBUG + icalerror_check_arg_rv( (buf!=0),"buf"); + icalerror_check_arg_rv( (*buf!=0),"*buf"); + icalerror_check_arg_rv( (pos!=0),"pos"); + icalerror_check_arg_rv( (*pos!=0),"*pos"); + icalerror_check_arg_rv( (buf_size!=0),"buf_size"); + icalerror_check_arg_rv( (*buf_size!=0),"*buf_size"); + icalerror_check_arg_rv( (string!=0),"string"); +#endif + + string_length = strlen(string); + data_length = (size_t)*pos - (size_t)*buf; + final_length = data_length + string_length; + + if ( final_length >= (size_t) *buf_size) { + + + *buf_size = (*buf_size) * 2 + final_length; + + new_buf = realloc(*buf,*buf_size); + + new_pos = (void*)((size_t)new_buf + data_length); + + *pos = new_pos; + *buf = new_buf; + } + + strcpy(*pos, string); + + *pos += string_length; +} + + +void +icalmemory_append_char(char** buf, char** pos, size_t* buf_size, + char ch) +{ + char *new_buf; + char *new_pos; + + size_t data_length, final_length; + +#ifndef ICAL_NO_INTERNAL_DEBUG + icalerror_check_arg_rv( (buf!=0),"buf"); + icalerror_check_arg_rv( (*buf!=0),"*buf"); + icalerror_check_arg_rv( (pos!=0),"pos"); + icalerror_check_arg_rv( (*pos!=0),"*pos"); + icalerror_check_arg_rv( (buf_size!=0),"buf_size"); + icalerror_check_arg_rv( (*buf_size!=0),"*buf_size"); +#endif + + data_length = (size_t)*pos - (size_t)*buf; + + final_length = data_length + 2; + + if ( final_length > (size_t) *buf_size ) { + + + *buf_size = (*buf_size) * 2 + final_length +1; + + new_buf = realloc(*buf,*buf_size); + + new_pos = (void*)((size_t)new_buf + data_length); + + *pos = new_pos; + *buf = new_buf; + } + + **pos = ch; + *pos += 1; + **pos = 0; +} |