简单的文件读写

文件到buffer

char* from_file_to_buf(char *file_path)
{
    FILE *f = NULL;
    unsigned long len = 0;
    char prefix_buf[64] = {0};
    int add_len = 0;
    int f_len = 0;
    char *data = NULL;
    f=fopen(file_path, "rb");
    if (f == NULL)
    {
        return NULL;
    }
    fseek(f, 0, SEEK_END);
    len=ftell(f);
    fseek(f, 0, SEEK_SET);

    data=(char*)malloc(len + 512);
    if (data == NULL)
    {
        fclose(f);
        return NULL;
    }

    f_len = fread(data,1,len,f);
    if(f_len <= 0)
    {
        fclose(f);
        free(data);
        data = NULL;
        return NULL;
    }
    fclose(f);
    return data;
}

buffer到文件

int from_buf_to_file(char *file_path, char *file_content)
{
    FILE *f;
    long len;

    f=fopen(file_path,"w");
    if(f == NULL)
    {
        printf("ERROR:%s\n", "Open file failed.");
        return -1;
    }

    len = strlen(file_content);
    file_content[len] = '\0';
    fwrite(file_content,1,len,f);
    fclose(f);
}

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