source: trunk/dll/literal.c@ 1327

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

  $Id: literal.c 1183 2008-09-10 21:56:13Z jbs $

  string quoting utilities
  wildcarding utilities

  Copyright (c) 1993-98 M. Kimes
  Copyright (c) 2004, 2007 Steven H.Levine

  Archive containers

  01 Aug 04 SHL Rework fixup to avoid overflows
  16 Jun 06 SHL liternal: comments
  22 Jul 06 SHL Check more run time errors
  20 Aug 07 GKY Move #pragma alloc_text to end for OpenWatcom compat
  16 Nov 07 SHL Report fixup buffer overflow
  15 Mar 08 KOMH Fix wildcard for multiple dots

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

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

#define INCL_OS2
#define INCL_WIN
#define INCL_LONGLONG                   // dircnrs.h

#include "fm3dll.h"
#include "errutil.h"                    // Dos_Error...
#include "literal.h"
#include "wrappers.h"                   // xmalloc
#include "fortify.h"

static PSZ pszSrcFile = __FILE__;

static INT index(const CHAR * s, const CHAR c);

/* Get index of char in string
 * @parm s string to search
 * @parm c char to search for
 * @return 0 relative index of c in s or -1
 */

static INT index(const CHAR * s, const CHAR c)
{
  CHAR *p;

  p = strchr(s, c);
  if (p == NULL || !*p)
    return -1;
  return (INT) (p - s);
}

/* literal()
 * Translate a string with \ escape tokens to binary equivalent
 * Translates in place
 *
 * 1.  \x1b translates to CHAR(0x1b)
 * 2.  \27  translates to CHAR(27)
 * 3.  \"   translates to "
 * 4.  \'   translates to '
 * 5.  \\   translates to \
 * 6.  \r   translates to carriage return
 * 7.  \n   translates to linefeed
 * 8.  \b   translates to backspace
 * 9.  \t   translates to tab
 * 10. \a   translates to bell
 * 11. \f   translates to formfeed
 *
 * Synopsis
 *    *s = "this\x20is\32a test of \\MSC\\CSM\7"
 *    literal(s);
 *
 *    ( s now equals "this is a test of \MSC\CSM")
 *
 * Return converted character count like strlen()
 * Count does not include terminating nul
 */

#define HEX "0123456789ABCDEF"
#define DEC "0123456789"

UINT literal(PSZ pszBuf)
{
  INT wpos;
  INT iBuf;
  UINT cBufBytes;
  INT iBufSave;
  PSZ pszOut;
  PSZ pszWork;
  CHAR wchar;

  if (!pszBuf || !*pszBuf)
    return 0;
  cBufBytes = strlen(pszBuf) + 1;
  pszWork = pszOut = xmalloc(cBufBytes + 1, pszSrcFile, __LINE__);
  if (!pszWork)
    return 0;

  iBuf = 0;                                /* set index to first character */
  while (pszBuf[iBuf]) {
    switch (pszBuf[iBuf]) {
    case '\\':
      switch (pszBuf[iBuf + 1]) {
      case 'x':                        /* hexadecimal */
        wchar = 0;
        iBuf += 2;                        /* get past "\x" */
        if (index(HEX, (CHAR) toupper(pszBuf[iBuf])) != -1) {
          iBufSave = iBuf;
          while (((wpos = index(HEX, (CHAR) toupper(pszBuf[iBuf]))) != -1) &&
                 iBuf < iBufSave + 2) {
            wchar = (CHAR) (wchar << 4) + (CHAR) wpos;
            iBuf++;
          }
        }
        else
          wchar = 'x';                        /* just an x */
        iBuf--;
        *pszOut++ = wchar;
        break;

      case '\\':                        /* we want a "\" */
        iBuf++;
        *pszOut++ = '\\';
        break;

      case 't':                        /* tab CHAR */
        iBuf++;
        *pszOut++ = '\t';
        break;

      case 'n':                        /* new line */
        iBuf++;
        *pszOut++ = '\n';
        break;

      case 'r':                        /* carr return */
        iBuf++;
        *pszOut++ = '\r';
        break;

      case 'b':                        /* back space */
        iBuf++;
        *pszOut++ = '\b';
        break;

      case 'f':                        /* formfeed */
        iBuf++;
        *pszOut++ = '\x0c';
        break;

      case 'a':                        /* bell */
        iBuf++;
        *pszOut++ = '\07';
        break;

      case '\'':                        /* single quote */
        iBuf++;
        *pszOut++ = '\'';
        break;

      case '\"':                        /* double quote */

        iBuf++;
        *pszOut++ = '\"';
        break;

      default:                                /* decimal */
        iBuf++;                                /* get past "\" */
        wchar = 0;
        if (index(DEC, pszBuf[iBuf]) != -1) {
          iBufSave = iBuf;
          do {                                /* cvt to binary */
            wchar = (CHAR) (wchar * 10 + (pszBuf[iBuf++] - 48));
          } while (index(DEC, pszBuf[iBuf]) != -1 && iBuf < iBufSave + 3);
          iBuf--;
        }
        else
          wchar = pszBuf[iBuf];
        *pszOut++ = wchar;
        break;
      }                                        // switch
      break;

    default:
      *pszOut++ = pszBuf[iBuf];
      break;
    }                                        // switch
    iBuf++;
  }                                        // while
  *pszOut = 0;                                /* Always terminate, even if not string */

  cBufBytes = pszOut - pszWork;                /* Calc string length excluding terminator */
  memcpy(pszBuf, pszWork, cBufBytes + 1);        /* Overwrite including terminator */
  free(pszWork);

  return cBufBytes;                        /* Return string length */
}

/** Check wildcard match
 * @parm pszBuf Buffer to check
 * @parm pszWildCard wildcard to match
 * @parm fNotFileSpec TRUE if generic match else filespec match
 * @return TRUE if matched else FALSE
 */

BOOL wildcard(const PSZ pszBuf, const PSZ pszWildCard,
              const BOOL fNotFileSpec)
{
    PSZ fstr = pszBuf;
    PSZ fcard = pszWildCard;

    while (*fstr && *fcard) {
      switch (*fcard) {
        case '*' :
        {
          PSZ fstr1;

          // find next non-wild character in wildcard
          while (*fcard && ( *fcard == '*' || *fcard == '?'))
            fcard++;

          // if last char of wildcard is *, it matches
          if (!*fcard)
            return TRUE;

          fstr1 = fstr;
          while (*fstr1) {
            // skip until partition, match, or eos
            while (*fstr1 && toupper( *fstr1 ) != toupper( *fcard ) &&
                   (fNotFileSpec || ( *fstr1 != '/' && *fstr1 != '\\')))
              fstr1++;

            if (!*fstr1 || ( !fNotFileSpec && ( *fstr1 == '/' || *fstr1 == '\\')))
              break;

            if (wildcard( fstr1, fcard, fNotFileSpec ) == TRUE)
              return TRUE;

            fstr1++;
          }

          fstr = fstr1;
          break;
        }

        case '?' :          // character substitution
          fcard++;

          if (fNotFileSpec || ( *fstr != '.' && *fstr != '/' && *fstr != '\\'))
            fstr++;     // skip (match) next character
          break;

        default :
          if (fNotFileSpec || (*fstr  != '/' && *fstr  != '\\') ||
              (*fcard != '/' && *fcard != '\\')) {
            if (toupper( *fstr ) != toupper( *fcard))
              return FALSE;
          }

          fcard++;
          fstr++;
          break;
      }
    }

    if (!*fstr) {
        // remove trailing * and ?
      while (*fcard && ( *fcard == '?' || *fcard == '*'))
        fcard++;

      if (!fNotFileSpec) {
        // remove trailing .
        while (*fcard && *fcard == '.')
          fcard++;
      }
    }

    return (*fstr == *fcard);
}

// fixup - quote literal character array

PSZ fixup(const PCH pachIn, PSZ pszOutBuf, const UINT cBufBytes,
          const UINT cInBytes)
{
  PCH pchIn = pachIn;
  PCH pchOut = pszOutBuf;

  // input is a character array, not a string - may not be null terminated
  // cBufBytes is buffer size
  if (pachIn) {
    // 16 Nov 07 SHL fixme to optimize counting and speed
    // Ensure room for null and possible \ escape
    while (pchIn - pachIn < cInBytes) {
      if (pchOut - pszOutBuf + 4 >= cBufBytes) {
        *pchOut = 0;
        Runtime_Error(pszSrcFile, __LINE__, "buffer too small for %s", pszOutBuf);
        break;
      }

      if (!isprint(*pchIn)) {
        if (*pchIn == '\r') {
          *pchOut++ = '\\';
          *pchOut++ = 'r';
        }
        else if (*pchIn == '\n') {
          *pchOut++ = '\\';
          *pchOut++ = 'n';
        }
        else if (*pchIn == '\b') {
          *pchOut++ = '\\';
          *pchOut++ = 'b';
        }
        else {
          sprintf(pchOut, "\\x%02x", (UCHAR)*pchIn);
          pchOut += 4;
        }
        pchIn++;
      }
      else if (*pchIn == '\\') {
        *pchOut++ = '\\';
        *pchOut++ = '\\';
        pchIn++;
      }
      else
        *pchOut++ = *pchIn++;
    } // while

  } // if pachIn
  *pchOut = 0;
  return pszOutBuf;
}

#pragma alloc_text(LITERAL,literal,index,fixup,wildcard)