los_seq_buf.c 4.3 KB
Newer Older
W
wenjun 已提交
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156
/*
 * Copyright (c) 2013-2019, Huawei Technologies Co., Ltd. All rights reserved.
 * Copyright (c) 2020, Huawei Device Co., Ltd. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this list of
 *    conditions and the following disclaimer.
 *
 * 2. 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.
 *
 * 3. Neither the name of the copyright holder nor the names of its contributors may be used
 *    to endorse or promote products derived from this software without specific prior written
 *    permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "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 COPYRIGHT HOLDER OR
 * CONTRIBUTORS 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.
 */

#include "los_seq_buf.h"
#include <stdlib.h>

static int ExpandSeqBuf(struct SeqBuf *seqBuf, size_t oldCount)
{
    char *newBuf = NULL;
    int ret;

    if ((seqBuf == NULL) || (seqBuf->buf == NULL)) {
        return -LOS_NOK;
    }

    if (seqBuf->size >= SEQBUF_LIMIT_SIZE) {
        goto EXPAND_FAILED;
    }

    newBuf = (char*)malloc(seqBuf->size <<= 1);
    if (newBuf == NULL) {
        goto EXPAND_FAILED;
    }
    (void)memset_s(newBuf + oldCount, seqBuf->size - oldCount, 0, seqBuf->size - oldCount);

    ret = memcpy_s(newBuf, seqBuf->size, seqBuf->buf, oldCount);
    if (ret != LOS_OK) {
        free(newBuf);
        goto EXPAND_FAILED;
    }
    seqBuf->count = oldCount;

    free(seqBuf->buf);
    seqBuf->buf = newBuf;

    return LOS_OK;
EXPAND_FAILED:
    free(seqBuf->buf);
    seqBuf->buf = NULL;
    seqBuf->count = 0;
    seqBuf->size = 0;

    return -LOS_NOK;
}

struct SeqBuf *LosBufCreat(void)
{
    struct SeqBuf *seqBuf = NULL;

    seqBuf = (struct SeqBuf *)malloc(sizeof(struct SeqBuf));
    if (seqBuf == NULL) {
        errno = -LOS_ENOMEM;
        return NULL;
    }
    (void)memset_s(seqBuf, sizeof(struct SeqBuf), 0, sizeof(struct SeqBuf));

    return seqBuf;
}

int LosBufVprintf(struct SeqBuf *seqBuf, const char *fmt, va_list argList)
{
    bool needreprintf = FALSE;
    int bufLen;

    if (seqBuf == NULL) {
        return -LOS_EPERM;
    }

    if (seqBuf->buf == NULL) {
        seqBuf->size = SEQBUF_PAGE_SIZE;
        seqBuf->buf = (char *)malloc(seqBuf->size);
        if (seqBuf->buf == NULL) {
            return -LOS_ENOMEM;
        }
        (void)memset_s(seqBuf->buf, seqBuf->size, 0, seqBuf->size);
        seqBuf->count = 0;
    }

    do {
        bufLen = vsnprintf_s(seqBuf->buf + seqBuf->count, seqBuf->size - seqBuf->count,
                             seqBuf->size - seqBuf->count - 1, fmt, argList);
        if (bufLen >= 0) {
            /* succeed write. */
            seqBuf->count += bufLen;
            return 0;
        }
        if (seqBuf->buf[seqBuf->count] == '\0') {
            free(seqBuf->buf);
            seqBuf->buf = NULL;
            break;
        }

        needreprintf = TRUE;

        if (ExpandSeqBuf(seqBuf, seqBuf->count) != 0) {
            break;
        }
    } while (needreprintf);

    return -LOS_NOK;
}

int LosBufPrintf(struct SeqBuf *seqBuf, const char *fmt, ...)
{
    va_list argList;
    int ret;

    va_start(argList, fmt);
    ret = LosBufVprintf(seqBuf, fmt, argList);
    va_end(argList);

    return ret;
}

int LosBufRelease(struct SeqBuf *seqBuf)
{
    if (seqBuf == NULL) {
        return -LOS_EPERM;
    }

    if (seqBuf->buf != NULL) {
        free(seqBuf->buf);
        seqBuf->buf = NULL;
    }
    free(seqBuf);

    return LOS_OK;
}