ESP32 Forum

Posted: **Wed Sep 23, 2020 12:29 pm**

Hello all,
After a clean installation of Ubuntu 20.04 and a re-installation of Espressif esp-idf I tried to build the example project 'Hello-World'.
It resulted in build errors.

System used: Linux Ubuntu 20.04
Espressif esp-idf installed in ~/esp.
Version: v4.3-dev-1197-g8bc19ba89-dirty
Development board: Espressif ESP32-S2 Soala 1R (WROVER)

To make a long story short. I managed to solve the problem by editing the offending file:
~/esp/esp-idf/components/cbor/tinycbor/src/open_memstream.c

These are the changes / additions i did:

1st error: in line 46: .... # error ..."Cannot implement open..."
a) adding starting at line #31:
#ifndef __linux__
#define __linux__ 1
#endif

b) by changing (the former) line 45 #error...
#else
#error "Cannot implement open_memstream"
#endif

into:
#else
const char *error="Cannot implement open_memstream";
#endif

After these alterations the build process resulted in no error.

See the contents of the edited file below:

Code: [Select all] [Expand/Collapse]

/****************************************************************************
**
** Copyright (C) 2015 Intel Corporation
**
** Permission is hereby granted, free of charge, to any person obtaining a copy
** of this software and associated documentation files (the "Software"), to deal
** in the Software without restriction, including without limitation the rights
** to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
** copies of the Software, and to permit persons to whom the Software is
** furnished to do so, subject to the following conditions:
**
** The above copyright notice and this permission notice shall be included in
** all copies or substantial portions of the Software.
**
** THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
** IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
** FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
** AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
** LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
** OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
** THE SOFTWARE.
**
****************************************************************************/
 
#define _BSD_SOURCE 1
#define _DEFAULT_SOURCE 1
#define _GNU_SOURCE 1
 
// Addition Paulsk (for test) because of (probably) missing define __linux__ 
// because compiler gives errors: unknown type RetType and LenType
#ifndef __linux__
#define __linux__ 1
#endif
 
 
#include <sys/types.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
 
#if defined(__unix__) || defined(__APPLE__)
#include <unistd.h>
#endif
 
#ifdef __APPLE__
typedef int RetType;
typedef int LenType;
#elif __linux__
typedef ssize_t RetType;
typedef size_t LenType;
#else
const char *error="Cannot implement open_memstream!"; // Changed by paulsk 2020-09-23 because of error "#error Cannot ..." (no type def, no '=' and without ; at end of line)
#endif
 
#include "compilersupport_p.h"
 
struct Buffer
{
    char **ptr;
    size_t *len;
    size_t alloc;
};
 
static RetType write_to_buffer(void *cookie, const char *data, LenType len)
{
    struct Buffer *b = (struct Buffer *)cookie;
    char *ptr = *b->ptr;
    size_t newsize;
 
    errno = EFBIG;
    if (unlikely(add_check_overflow(*b->len, len, &newsize)))
        return -1;
 
    if (newsize >= b->alloc) { // NB! one extra byte is needed to avoid buffer overflow at close_buffer
        // make room
        size_t newalloc = newsize + newsize / 2 + 1;    // give 50% more room
        ptr = realloc(ptr, newalloc);
        if (ptr == NULL)
            return -1;
        b->alloc = newalloc;
        *b->ptr = ptr;
    }
 
    memcpy(ptr + *b->len, data, len);
    *b->len = newsize;
    return len;
}
 
static int close_buffer(void *cookie)
{
    struct Buffer *b = (struct Buffer *)cookie;
    if (*b->ptr)
        (*b->ptr)[*b->len] = '\0';
    free(b);
    return 0;
}
 
FILE *open_memstream(char **bufptr, size_t *lenptr)
{
    struct Buffer *b = (struct Buffer *)malloc(sizeof(struct Buffer));
    if (b == NULL)
        return NULL;
    b->alloc = 0;
    b->len = lenptr;
    b->ptr = bufptr;
    *bufptr = NULL;
    *lenptr = 0;
 
#ifdef __APPLE__
    return funopen(b, NULL, write_to_buffer, NULL, close_buffer);
#elif __linux__
    static const cookie_io_functions_t vtable = {
        NULL,
        write_to_buffer,
        NULL,
        close_buffer
    };
    return fopencookie(b, "w", vtable);
#endif
}

ESP32 Forum

error and omission in file open_memstream.c cause of build errors

error and omission in file open_memstream.c cause of build errors