Subversion Repositories SvarDOS

/* This file is part of the SvarCOM project and is published under the terms

 * of the MIT license.

 *

 * Copyright (C) 2021 Mateusz Viste

 *

 * 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.

 */

/*

 * del/erase

 */

static enum cmd_result cmd_del(struct cmd_funcparam *p) {

  const char *delspec = NULL;

  unsigned short err = 0;

  unsigned short confirmflag = 0;

  unsigned short i;

  unsigned short pathlimit = 0;

  char *buff = p->BUFFER;

  struct DTA *dta = (void *)0x80; /* use the default DTA at location 80h in PSP */

  char *fname = dta->fname;

  if (cmd_ishlp(p)) {

    outputnl("Deletes one or more files.");

    outputnl("");

    outputnl("DEL [drive:][path]filename [/P]");

    outputnl("ERASE [drive:][path]filename [/P]");

    outputnl("");

    outputnl("[drive:][path]filename  Specifies the file(s) to delete.");

    outputnl("/P  Prompts for confirmation before deleting each file.");

    return(CMD_OK);

  }

  if (p->argc == 0) {

    outputnl("Required parameter missing");

    return(CMD_FAIL);

  }

  /* scan argv for delspec and possible /p or /v */

  for (i = 0; i < p->argc; i++) {

    /* delspec? */

    if (p->argv[i][0] == '/') {

      if (imatch(p->argv[i], "/p")) {

        confirmflag = 1;

      } else {

        output("Invalid switch:");

        output(" ");

        outputnl(p->argv[i]);

        return(CMD_FAIL);

      }

    } else if (delspec != NULL) { /* otherwise its a delspec */

      outputnl("Too many parameters");

      return(CMD_FAIL);

    } else {

      delspec = p->argv[i];

    }

  }

  /* convert path to canonical form */

  file_truename(delspec, buff);

  /* is delspec pointing at a directory? if so, add a \*.* */

  i = path_appendbkslash_if_dir(buff);

  if (buff[i - 1] == '\\') strcat(buff, "????????.???");

  /* parse delspec in buff and remember where last backslash or slash is */

  for (i = 0; buff[i] != 0; i++) if (buff[i] == '\\') pathlimit = i + 1;

  /* is this about deleting all content inside a directory? if no per-file

   * confirmation set, ask for a global confirmation */

  if ((confirmflag == 0) && (imatch(buff + pathlimit, "????????.???"))) {

    outputnl("All files in directory will be deleted!");

    if (askchoice("Are you sure (Y/N)?", "YN") != 0) return(CMD_FAIL);

  }

  for (i = 0;; i = 1) {

    /* exec FindFirst or FindNext */

    if (i == 0) {

      err = findfirst(dta, buff, DOS_ATTR_RO | DOS_ATTR_SYS | DOS_ATTR_HID);

      if (err != 0) { /* report the error only if query had no wildcards */

        for (i = 0; buff[i] != 0; i++) if (buff[i] == '?') break;

        if (buff[i] == 0) outputnl(doserr(err));

        break;

      }

    } else {

      if (findnext(dta) != 0) break; /* do not report errors on findnext() */

    }

    /* prep the full path/name of the file in buff */

    /* NOTE: buff contained the search pattern but it is no longer needed so I

     * can reuse it now */

    strcpy(buff + pathlimit, fname);

    /* ask if confirmation required: PLIK.TXT  Delete (Y/N)? */

    if (confirmflag) {

      output(buff);

      output(" \t");

      if (askchoice("Delete (Y/N)?", "YN") != 0) continue;

    }

    /* del found file */

    _asm {

      push ax

      push dx

      mov ah, 0x41      /* delete a file, DS:DX points to an ASCIIZ filespec (no wildcards allowed) */

      mov dx, buff

      int 0x21

      jnc DONE

      mov [err], ax

      DONE:

      pop dx

      pop ax

    }

    if (err != 0) {

      output(fname);

      output(": ");

      outputnl(doserr(err));

      break;

    }

  }

  if (err == 0) return(CMD_OK);

  return(CMD_FAIL);

}