/***********************************************************************

  $Id: wrappers.c 827 2007-09-02 18:32:14Z stevenhl $

  Wrappers with error checking

  Copyright (c) 2006 Steven H.Levine

  22 Jul 06 SHL Baseline
  29 Jul 06 SHL Add xgets_stripped
  18 Aug 06 SHL Correct Runtime_Error line number report
  20 Aug 07 GKY Move #pragma alloc_text to end for OpenWatcom compat
  01 Sep 07 GKY Add xDosSetPathInfo to fix case where FS3 buffer crosses 64k boundry

***********************************************************************/

#define INCL_WIN
#define INCL_DOS
#define INCL_DOSERRORS
#include <os2.h>

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "fm3dll.h"
#include "fm3str.h"

static PSZ pszSrcFile = __FILE__;

/**
 * Wrap DosSetPathInfo to avoid spurious ERROR_INVALID_NAME returns
 * Some kernels to do not correctly handle FILESTATUS3 and PEAOP2 buffers
 * that cross a 64K boundary.
 * When this occurs, they return ERROR_INVALID_NAME.
 * This code works around the problem because if the passed buffer crosses
 * the boundary the alternate buffer will not because both are on the stack
 * and we don't put enough additional data on the stack for this to occur.
 * It is caller's responsitibility to report errors
 * @param pInfoBuf pointer to FILESTATUS3 or EAOP2 buffer
 * @param ulInfoLevel FIL_STANDARD or FIL_QUERYEASIZE
 * @returns Same as DosSetPathInfo
 */

APIRET APIENTRY xDosSetPathInfo(PSZ pszPathName,
				ULONG ulInfoLevel,
				PVOID pInfoBuf,
				ULONG cbInfoBuf,
				ULONG flOptions)
{
    APIRET rc = DosSetPathInfo(pszPathName, ulInfoLevel, pInfoBuf, cbInfoBuf, flOptions);
    FILESTATUS3 alt_fs3;
    EAOP2 alt_eaop2;
    if (rc == ERROR_INVALID_NAME) {
      switch (ulInfoLevel) {
      case FIL_STANDARD:
	alt_fs3 = *(PFILESTATUS3)pInfoBuf;	// Copy
	rc = DosSetPathInfo(pszPathName, ulInfoLevel, &alt_fs3, sizeof(alt_fs3), flOptions);
	break;
      case FIL_QUERYEASIZE:
	alt_eaop2 = *(PEAOP2)pInfoBuf;	// Copy
	rc = DosSetPathInfo(pszPathName, ulInfoLevel, &alt_eaop2, sizeof(alt_eaop2), flOptions);
	break;
      default:
	Runtime_Error(pszSrcFile, __LINE__, "ulInfoLevel %u unexpected", ulInfoLevel);
	rc = ERROR_INVALID_PARAMETER;
      } // switch
    }
    return rc;
}

PSZ xfgets(PSZ pszBuf, size_t cMaxBytes, FILE * fp, PCSZ pszSrcFile,
	   UINT uiLineNumber)
{
  PSZ psz = fgets(pszBuf, cMaxBytes, fp);

  if (!psz) {
    if (ferror(fp))
      Runtime_Error(pszSrcFile, uiLineNumber, "fgets");
  }
  else {
    size_t c = strlen(psz);

    if (c + 1 > cMaxBytes)
      Runtime_Error(pszSrcFile, uiLineNumber, "buffer overflow");
    else if (!c || (psz[c - 1] != '\n' && psz[c - 1] != '\r'))
      Runtime_Error(pszSrcFile, uiLineNumber, "missing EOL");
  }
  return psz;
}

PSZ xfgets_bstripcr(PSZ pszBuf, size_t cMaxBytes, FILE * fp, PCSZ pszSrcFile,
		    UINT uiLineNumber)
{
  PSZ psz = xfgets(pszBuf, cMaxBytes, fp, pszSrcFile, uiLineNumber);

  if (psz)
    bstripcr(psz);
  return psz;
}

FILE *xfopen(PCSZ pszFileName, PCSZ pszMode, PCSZ pszSrcFile,
	     UINT uiLineNumber)
{
  FILE *fp = fopen(pszFileName, pszMode);

  if (!fp)
    Runtime_Error(pszSrcFile, uiLineNumber, "fopen");
  return fp;
}

FILE *xfsopen(PCSZ pszFileName, PCSZ pszMode, INT fSharemode, PCSZ pszSrcFile,
	      UINT uiLineNumber)
{
  FILE *fp = _fsopen((PSZ) pszFileName, (PSZ) pszMode, fSharemode);

  if (!fp)
    Runtime_Error(pszSrcFile, uiLineNumber, "_fsopen");
  return fp;
}

//== xfree - safe free ==

VOID xfree(PVOID pv)
{
  if (pv)
    free(pv);
}

//== xmalloc() malloc with error checking ==

PVOID xmalloc(size_t cBytes, PCSZ pszSrcFile, UINT uiLineNumber)
{
  PVOID pv = malloc(cBytes);

  if (!pv)
    Runtime_Error(pszSrcFile, uiLineNumber, GetPString(IDS_OUTOFMEMORY));

  return pv;
}

//== xmallocz() malloc and zero with error checking ==

PVOID xmallocz(size_t cBytes, PCSZ pszSrcFile, UINT uiLineNumber)
{
  PVOID pv = malloc(cBytes);

  if (!pv)
    Runtime_Error(pszSrcFile, uiLineNumber, GetPString(IDS_OUTOFMEMORY));
  else
    memset(pv, 0, cBytes);

  return pv;
}

//== xrealloc() realloc with error checking ==

PVOID xrealloc(PVOID pvIn, size_t cBytes, PCSZ pszSrcFile, UINT uiLineNumber)
{
  PVOID pv = realloc(pvIn, cBytes);

  if (!pv && cBytes)
    Runtime_Error(pszSrcFile, uiLineNumber, GetPString(IDS_OUTOFMEMORY));

  return pv;

}

//== xstrdup() strdup with error checking ==

PVOID xstrdup(PCSZ pszIn, PCSZ pszSrcFile, UINT uiLineNumber)
{
  PSZ psz = strdup(pszIn);

  if (!psz)
    Runtime_Error(pszSrcFile, uiLineNumber, GetPString(IDS_OUTOFMEMORY));

  return psz;
}

#pragma alloc_text(WRAPPERS1,xfree,xfopen,xfsopen,xmalloc,xrealloc, xstrdup)