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authorAlexis Menard <alexis.menard@nokia.com>2010-03-29 06:01:09 (GMT)
committerAlexis Menard <alexis.menard@nokia.com>2010-03-29 06:03:47 (GMT)
commit51a444a789ff5f3ba72d3f817f4cdf427d2ff91d (patch)
tree075d06f1a5c6bd0159af201847f1353f63a455bd /doc/src/snippets/textdocument-frames/xmlwriter.cpp
parentd8265f2edd89cc5a9ff0a490177fa6ce3e0b7785 (diff)
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Use QSKIP rather than commenting a failure.
Reviewed-by:TrustMe
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/***************************************************************************
 *                                  _   _ ____  _
 *  Project                     ___| | | |  _ \| |
 *                             / __| | | | |_) | |
 *                            | (__| |_| |  _ <| |___
 *                             \___|\___/|_| \_\_____|
 *
 * Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
 *
 * This software is licensed as described in the file COPYING, which
 * you should have received as part of this distribution. The terms
 * are also available at https://curl.haxx.se/docs/copyright.html.
 *
 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
 * copies of the Software, and permit persons to whom the Software is
 * furnished to do so, under the terms of the COPYING file.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 ***************************************************************************/

#include "curl_setup.h"

#ifdef CURLDEBUG

#include <curl/curl.h>

#include "urldata.h"

#define MEMDEBUG_NODEFINES /* don't redefine the standard functions */

/* The last 3 #include files should be in this order */
#include "curl_printf.h"
#include "curl_memory.h"
#include "memdebug.h"

/*
 * Until 2011-08-17 libcurl's Memory Tracking feature also performed
 * automatic malloc and free filling operations using 0xA5 and 0x13
 * values. Our own preinitialization of dynamically allocated memory
 * might be useful when not using third party memory debuggers, but
 * on the other hand this would fool memory debuggers into thinking
 * that all dynamically allocated memory is properly initialized.
 *
 * As a default setting, libcurl's Memory Tracking feature no longer
 * performs preinitialization of dynamically allocated memory on its
 * own. If you know what you are doing, and really want to retain old
 * behavior, you can achieve this compiling with preprocessor symbols
 * CURL_MT_MALLOC_FILL and CURL_MT_FREE_FILL defined with appropriate
 * values.
 */

#ifdef CURL_MT_MALLOC_FILL
# if (CURL_MT_MALLOC_FILL < 0) || (CURL_MT_MALLOC_FILL > 0xff)
#   error "invalid CURL_MT_MALLOC_FILL or out of range"
# endif
#endif

#ifdef CURL_MT_FREE_FILL
# if (CURL_MT_FREE_FILL < 0) || (CURL_MT_FREE_FILL > 0xff)
#   error "invalid CURL_MT_FREE_FILL or out of range"
# endif
#endif

#if defined(CURL_MT_MALLOC_FILL) && defined(CURL_MT_FREE_FILL)
# if (CURL_MT_MALLOC_FILL == CURL_MT_FREE_FILL)
#   error "CURL_MT_MALLOC_FILL same as CURL_MT_FREE_FILL"
# endif
#endif

#ifdef CURL_MT_MALLOC_FILL
#  define mt_malloc_fill(buf,len) memset((buf), CURL_MT_MALLOC_FILL, (len))
#else
#  define mt_malloc_fill(buf,len) Curl_nop_stmt
#endif

#ifdef CURL_MT_FREE_FILL
#  define mt_free_fill(buf,len) memset((buf), CURL_MT_FREE_FILL, (len))
#else
#  define mt_free_fill(buf,len) Curl_nop_stmt
#endif

struct memdebug {
  size_t size;
  union {
    curl_off_t o;
    double d;
    void *p;
  } mem[1];
  /* I'm hoping this is the thing with the strictest alignment
   * requirements.  That also means we waste some space :-( */
};

/*
 * Note that these debug functions are very simple and they are meant to
 * remain so. For advanced analysis, record a log file and write perl scripts
 * to analyze them!
 *
 * Don't use these with multithreaded test programs!
 */

FILE *curl_dbg_logfile = NULL;
static bool memlimit = FALSE; /* enable memory limit */
static long memsize = 0;  /* set number of mallocs allowed */

/* this sets the log file name */
void curl_dbg_memdebug(const char *logname)
{
  if(!curl_dbg_logfile) {
    if(logname && *logname)
      curl_dbg_logfile = fopen(logname, FOPEN_WRITETEXT);
    else
      curl_dbg_logfile = stderr;
#ifdef MEMDEBUG_LOG_SYNC
    /* Flush the log file after every line so the log isn't lost in a crash */
    if(curl_dbg_logfile)
      setbuf(curl_dbg_logfile, (char *)NULL);
#endif
  }
}

/* This function sets the number of malloc() calls that should return
   successfully! */
void curl_dbg_memlimit(long limit)
{
  if(!memlimit) {
    memlimit = TRUE;
    memsize = limit;
  }
}

/* returns TRUE if this isn't allowed! */
static bool countcheck(const char *func, int line, const char *source)
{
  /* if source is NULL, then the call is made internally and this check
     should not be made */
  if(memlimit && source) {
    if(!memsize) {
      if(source) {
        /* log to file */
        curl_dbg_log("LIMIT %s:%d %s reached memlimit\n",
                     source, line, func);
        /* log to stderr also */
        fprintf(stderr, "LIMIT %s:%d %s reached memlimit\n",
                source, line, func);
        fflush(curl_dbg_logfile); /* because it might crash now */
      }
      errno = ENOMEM;
      return TRUE; /* RETURN ERROR! */
    }
    else
      memsize--; /* countdown */


  }

  return FALSE; /* allow this */
}

void *curl_dbg_malloc(size_t wantedsize, int line, const char *source)
{
  struct memdebug *mem;
  size_t size;

  DEBUGASSERT(wantedsize != 0);

  if(countcheck("malloc", line, source))
    return NULL;

  /* alloc at least 64 bytes */
  size = sizeof(struct memdebug) + wantedsize;

  mem = (Curl_cmalloc)(size);
  if(mem) {
    /* fill memory with junk */
    mt_malloc_fill(mem->mem, wantedsize);
    mem->size = wantedsize;
  }

  if(source)
    curl_dbg_log("MEM %s:%d malloc(%zu) = %p\n",
                 source, line, wantedsize,
                 mem ? (void *)mem->mem : (void *)0);

  return (mem ? mem->mem : NULL);
}

void *curl_dbg_calloc(size_t wanted_elements, size_t wanted_size,
                      int line, const char *source)
{
  struct memdebug *mem;
  size_t size, user_size;

  DEBUGASSERT(wanted_elements != 0);
  DEBUGASSERT(wanted_size != 0);

  if(countcheck("calloc", line, source))
    return NULL;

  /* alloc at least 64 bytes */
  user_size = wanted_size * wanted_elements;
  size = sizeof(struct memdebug) + user_size;

  mem = (Curl_ccalloc)(1, size);
  if(mem)
    mem->size = user_size;

  if(source)
    curl_dbg_log("MEM %s:%d calloc(%zu,%zu) = %p\n",
                 source, line, wanted_elements, wanted_size,
                 mem ? (void *)mem->mem : (void *)0);

  return (mem ? mem->mem : NULL);
}

char *curl_dbg_strdup(const char *str, int line, const char *source)
{
  char *mem;
  size_t len;

  DEBUGASSERT(str != NULL);

  if(countcheck("strdup", line, source))
    return NULL;

  len = strlen(str) + 1;

  mem = curl_dbg_malloc(len, 0, NULL); /* NULL prevents logging */
  if(mem)
    memcpy(mem, str, len);

  if(source)
    curl_dbg_log("MEM %s:%d strdup(%p) (%zu) = %p\n",
                 source, line, (const void *)str, len, (const void *)mem);

  return mem;
}

#if defined(WIN32) && defined(UNICODE)
wchar_t *curl_dbg_wcsdup(const wchar_t *str, int line, const char *source)
{
  wchar_t *mem;
  size_t wsiz, bsiz;

  DEBUGASSERT(str != NULL);

  if(countcheck("wcsdup", line, source))
    return NULL;

  wsiz = wcslen(str) + 1;
  bsiz = wsiz * sizeof(wchar_t);