source: mainline/uspace/lib/c/generic/adt/measured_strings.c@ 7390870

/*
 * Copyright (c) 2009 Lukas Mejdrech
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - 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.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
 */

/** @addtogroup net
 *  @{
 */

/** @file
 *  Character string with measured length implementation.
 *  @see measured_strings.h
 */

#include <adt/measured_strings.h>
#include <malloc.h>
#include <mem.h>
#include <unistd.h>
#include <errno.h>
#include <err.h>
#include <async.h>


measured_string_ref measured_string_create_bulk(const char * string, size_t length){
        measured_string_ref new;

        if(length == 0){
                while(string[length]){
                        ++ length;
                }
        }
        new = (measured_string_ref) malloc(sizeof(measured_string_t) + (sizeof(char) * (length + 1)));
        if(! new){
                return NULL;
        }
        new->length = length;
        new->value = ((char *) new) + sizeof(measured_string_t);
        // append terminating zero explicitly - to be safe
        memcpy(new->value, string, new->length);
        new->value[new->length] = '\0';
        return new;
}

measured_string_ref measured_string_copy(measured_string_ref source){
        measured_string_ref new;

        if(! source){
                return NULL;
        }
        new = (measured_string_ref) malloc(sizeof(measured_string_t));
        if(new){
                new->value = (char *) malloc(source->length + 1);
                if(new->value){
                        new->length = source->length;
                        memcpy(new->value, source->value, new->length);
                        new->value[new->length] = '\0';
                        return new;
                }else{
                        free(new);
                }
        }
        return NULL;
}

int measured_strings_receive(measured_string_ref * strings, char ** data, size_t count){
        ERROR_DECLARE;

        size_t * lengths;
        size_t index;
        size_t length;
        char * next;
        ipc_callid_t callid;

        if((! strings) || (! data) || (count <= 0)){
                return EINVAL;
        }
        lengths = (size_t *) malloc(sizeof(size_t) * (count + 1));
        if(! lengths){
                return ENOMEM;
        }
        if((! async_data_write_receive(&callid, &length))
                || (length != sizeof(size_t) * (count + 1))){
                free(lengths);
                return EINVAL;
        }
        if(ERROR_OCCURRED(async_data_write_finalize(callid, lengths, sizeof(size_t) * (count + 1)))){
                free(lengths);
                return ERROR_CODE;
        }
        *data = malloc(lengths[count]);
        if(!(*data)){
                return ENOMEM;
        }
        (*data)[lengths[count] - 1] = '\0';
        *strings = (measured_string_ref) malloc(sizeof(measured_string_t) * count);
        if(!(*strings)){
                free(lengths);
                free(*data);
                return ENOMEM;
        }
        next = * data;
        for(index = 0; index < count; ++ index){
                (*strings)[index].length = lengths[index];
                if(lengths[index] > 0){
                        if((! async_data_write_receive(&callid, &length))
                                || (length != lengths[index])){
                                free(*data);
                                free(*strings);
                                free(lengths);
                                return EINVAL;
                        }
                        ERROR_PROPAGATE(async_data_write_finalize(callid, next, lengths[index]));
                        (*strings)[index].value = next;
                        next += lengths[index];
                        *next = '\0';
                        ++ next;
                }else{
                        (*strings)[index].value = NULL;
                }
        }
        free(lengths);
        return EOK;
}

/** Computes the lengths of the measured strings in the given array.
 *  @param[in] strings The measured strings array to be processed.
 *  @param[in] count The measured strings array size.
 *  @returns The computed sizes array.
 *  @returns NULL if there is not enough memory left.
 */
static size_t * prepare_lengths(const measured_string_ref strings, size_t count){
        size_t * lengths;
        size_t index;
        size_t length;

        lengths = (size_t *) malloc(sizeof(size_t) * (count + 1));
        if(! lengths){
                return NULL;
        }
        length = 0;
        for(index = 0; index < count; ++ index){
                lengths[index] = strings[index].length;
                length += lengths[index] + 1;
        }
        lengths[count] = length;
        return lengths;
}

int measured_strings_reply(const measured_string_ref strings, size_t count){
        ERROR_DECLARE;

        size_t * lengths;
        size_t index;
        size_t length;
        ipc_callid_t callid;

        if((! strings) || (count <= 0)){
                return EINVAL;
        }
        lengths = prepare_lengths(strings, count);
        if(! lengths){
                return ENOMEM;
        }
        if((! async_data_read_receive(&callid, &length))
                || (length != sizeof(size_t) * (count + 1))){
                free(lengths);
                return EINVAL;
        }
        if(ERROR_OCCURRED(async_data_read_finalize(callid, lengths, sizeof(size_t) * (count + 1)))){
                free(lengths);
                return ERROR_CODE;
        }
        free(lengths);
        for(index = 0; index < count; ++ index){
                if(strings[index].length > 0){
                        if((! async_data_read_receive(&callid, &length))
                                || (length != strings[index].length)){
                                return EINVAL;
                        }
                        ERROR_PROPAGATE(async_data_read_finalize(callid, strings[index].value, strings[index].length));
                }
        }
        return EOK;
}

int measured_strings_return(int phone, measured_string_ref * strings, char ** data, size_t count){
        ERROR_DECLARE;

        size_t * lengths;
        size_t index;
        char * next;

        if((phone <= 0) || (! strings) || (! data) || (count <= 0)){
                return EINVAL;
        }
        lengths = (size_t *) malloc(sizeof(size_t) * (count + 1));
        if(! lengths){
                return ENOMEM;
        }
        if(ERROR_OCCURRED(async_data_read_start(phone, lengths, sizeof(size_t) * (count + 1)))){
                free(lengths);
                return ERROR_CODE;
        }
        *data = malloc(lengths[count]);
        if(!(*data)){
                return ENOMEM;
        }
        *strings = (measured_string_ref) malloc(sizeof(measured_string_t) * count);
        if(!(*strings)){
                free(lengths);
                free(*data);
                return ENOMEM;
        }
        next = * data;
        for(index = 0; index < count; ++ index){
                (*strings)[index].length = lengths[index];
                if(lengths[index] > 0){
                        ERROR_PROPAGATE(async_data_read_start(phone, next, lengths[index]));
                        (*strings)[index].value = next;
                        next += lengths[index];
                        *next = '\0';
                        ++ next;
                }else{
                        (*strings)[index].value = NULL;
                }
        }
        free(lengths);
        return EOK;
}

int measured_strings_send(int phone, const measured_string_ref strings, size_t count){
        ERROR_DECLARE;

        size_t * lengths;
        size_t index;

        if((phone <= 0) || (! strings) || (count <= 0)){
                return EINVAL;
        }
        lengths = prepare_lengths(strings, count);
        if(! lengths){
                return ENOMEM;
        }
        if(ERROR_OCCURRED(async_data_write_start(phone, lengths, sizeof(size_t) * (count + 1)))){
                free(lengths);
                return ERROR_CODE;
        }
        free(lengths);
        for(index = 0; index < count; ++ index){
                if(strings[index].length > 0){
                        ERROR_PROPAGATE(async_data_write_start(phone, strings[index].value, strings[index].length));
                }
        }
        return EOK;
}

/** @}
 */