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.

 */

/*

 * copy

 */

/* /A - Used to copy ASCII files. Applies to the filename preceding it and to

 * all following filenames. Files will be copied until an end-of-file mark is

 * encountered in the file being copied. If an end-of-file mark is encountered

 * in the file, the rest of the file is not copied. DOS will append an EOF

 * mark at the end of the copied file.

 *

 * /B - Used to copy binary files. Applies to the filename preceding it and to

 * all following filenames. Copied files will be read by size (according to

 * the number of bytes indicated in the file`s directory listing). An EOF mark

 * is not placed at the end of the copied file.

 *

 * /V - Checks after the copy to assure that a file was copied correctly. If

 * the copy cannot be verified, the program will display an error message.

 * Using this option will result in a slower copying process.

 *

 * special case: "COPY A+B+C+D" means "append B, C and D files to the A file"

 * if A does not exist, then "append C and D to B", etc.

 */

struct copy_setup {

  const char *src[64];

  unsigned short src_count; /* how many sources are declared */

  char dst[256];

  unsigned short dstlen;

  char src_asciimode[64];

  char dst_asciimode;

  char last_asciimode; /* /A or /B impacts the file preceding it and becomes the new default for all files that follow */

  char verifyflag;

  char lastitemwasplus;

  unsigned short databufsz;

  char databuf[1];

};

/* copies src to dst, overwriting or appending to the destination.

 * - copy is performed in ASCII mode if asciiflag set (stop at first EOF in src

 *   and append an EOF in dst).

 * - returns zero on success, DOS error code on error */

unsigned short cmd_copy_internal(const char *dst, char dstascii, const char *src, char srcascii, unsigned char appendflag, void *buff, unsigned short buffsz) {

  unsigned short errcode = 0;

  unsigned short srch = 0xffff, dsth = 0xffff;

  _asm {

    /* open src */

    OPENSRC:

    mov ax, 0x3d00 /* DOS 2+ -- open an existing file, read access mode */

    mov dx, src    /* ASCIIZ fname */

    int 0x21       /* CF clear on success, handle in AX */

    mov [srch], ax /* store src handle in memory */

    /* check appendflag so I know if I have to try opening dst for append */

    xor al, al

    or al, [appendflag]

    jz CREATEDST

    /* try opening dst first if appendflag set */

    mov ax, 0x3d01 /* DOS 2+ -- open an existing file, write access mode */

    mov dx, dst    /* ASCIIZ fname */

    int 0x21       /* CF clear on success, handle in AX */

    jc CREATEDST   /* failed to open file (file does not exist) */

    mov [dsth], ax /* store dst handle in memory */

    /* got file open, LSEEK to end of it now so future data is appended */

    mov bx, ax     /* file handle in BX (was still in AX) */

    mov ax, 0x4202 /* DOS 2+ -- set file pointer to end of file + CX:DX */

    xor cx, cx     /* offset zero */

    xor dx, dx     /* offset zero */

    int 0x21       /* CF set on error */

    jc FAIL

    jmp COPY

    /* create dst */

    CREATEDST:

    mov ah, 0x3c   /* DOS 2+ -- create a file */

    mov dx, dst

    xor cx, cx     /* zero out attributes */

    int 0x21       /* handle in AX on success, CF set on error */

    jc FAIL

    mov [dsth], ax /* store dst handle in memory */

    /* perform actual copy */

    COPY:

    /* read a block from src */

    mov ah, 0x3f   /* DOS 2+ -- read from file */

    mov bx, [srch]

    mov cx, [buffsz]

    mov dx, [buff] /* DX points to buffer */

    int 0x21       /* CF set on error, bytes read in AX (0=EOF) */

    jc FAIL        /* abort on error */

    /* EOF? (ax == 0) */

    test ax, ax

    jz ENDOFFILE

    /* write block of AX bytes to dst */

    mov cx, ax     /* block length */

    mov ah, 0x40   /* DOS 2+ -- write to file (CX bytes from DS:DX) */

    mov bx, [dsth] /* file handle */

    /* mov dx, [buff] */ /* DX points to buffer already */

    int 0x21       /* CF clear and AX=CX on success */

    jc FAIL

    cmp ax, cx     /* sould be equal, otherwise failed */

    mov ax, 0x08   /* preset to DOS error "Insufficient memory" */

    jne FAIL

    jmp COPY

    ENDOFFILE:

    /* if dst ascii mode -> add an EOF (ASCII mode not supported for the time being) */

    jmp CLOSESRC

    FAIL:

    mov [errcode], ax

    CLOSESRC:

    /* close src and dst */

    mov bx, [srch]

    cmp bx, 0xffff

    je CLOSEDST

    mov ah, 0x3e   /* DOS 2+ -- close a file handle */

    int 0x21

    CLOSEDST:

    mov bx, [dsth]

    cmp bx, 0xffff

    je DONE

    mov ah, 0x3e   /* DOS 2+ -- close a file handle */

    int 0x21

    DONE:

  }

  return(errcode);

}

static int cmd_copy(struct cmd_funcparam *p) {

  struct copy_setup *setup = (void *)(p->BUFFER);

  unsigned short i;

  unsigned short copiedcount_in = 0, copiedcount_out = 0; /* number of input/output copied files */

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

  if (cmd_ishlp(p)) {

    outputnl("Copies one or more files to another location.");

    outputnl("");

    outputnl("COPY [/A|/B] source [/A|/B] [+source [/A|/B] [+...]] [destination [/A|/B]] [/V]");

    outputnl("");

    outputnl("source       Specifies the file or files to be copied");

    outputnl("/A           Indicates an ASCII text file");

    outputnl("/B           Indicates a binary file");

    outputnl("destination  Specifies the directory and/or filename for the new file(s)");

    outputnl("/V           Verifies that new files are written correctly");

    outputnl("");

    outputnl("To append files, specify a single file for destination, but multiple files");

    outputnl("for source (using wildcards or file1+file2+file3 format).");

    outputnl("");

    outputnl("NOTE: /A and /B are no-ops (ignored), provided only for compatibility reasons.");

    return(-1);

  }

  /* parse cmdline and fill the setup struct accordingly */

  memset(setup, 0, sizeof(*setup));

  setup->databufsz = p->BUFFERSZ - sizeof(*setup);

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

    /* switch? */

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

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

        setup->last_asciimode = 'b';

        if (imatch(p->argv[i], "/a")) setup->last_asciimode = 'a';

        /* */

        if (setup->dst[0] != 0) {

          setup->dst_asciimode = setup->last_asciimode;

        } else if (setup->src_count != 0) {

          setup->src_asciimode[setup->src_count - 1] = setup->last_asciimode;

        }

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

        setup->verifyflag = 1;

      } else {

        outputnl("Invalid switch");

        return(-1);

      }

      continue;

    }

    /* not a switch - must be either a source, a destination or a + */

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

      /* a plus cannot appear after destination or before first source */

      if ((setup->dst[0] != 0) || (setup->src_count == 0)) {

        outputnl("Invalid syntax");

        return(-1);

      }

      setup->lastitemwasplus = 1;

      /* a plus may be immediately followed by a filename - if so, emulate

       * a new argument */

      if (p->argv[i][1] != 0) {

        p->argv[i] += 1;

        i--;

      }

      continue;

    }

    /* src? (first non-switch or something that follows a +) */

    if ((setup->lastitemwasplus) || (setup->src_count == 0)) {

      setup->src[setup->src_count] = p->argv[i];

      setup->src_asciimode[setup->src_count] = setup->last_asciimode;

      setup->src_count++;

      setup->lastitemwasplus = 0;

      continue;

    }

    /* must be a dst then */

    if (setup->dst[0] != 0) {

      outputnl("Invalid syntax");

      return(-1);

    }

    if (file_truename(p->argv[i], setup->dst) != 0) {

      outputnl("Invalid destination");

      return(-1);

    }

    setup->dst_asciimode = setup->last_asciimode;

    /* if dst is a directory then append a backslash */

    setup->dstlen = path_appendbkslash_if_dir(setup->dst);

  }

  /* DEBUG: output setup content ("if 1" to enable) */

  #if 0

  printf("src: ");

  for (i = 0; i < setup->src_count; i++) {

    if (i != 0) printf(", ");

    printf("%s [%c]", setup->src[i], setup->src_asciimode[i]);

  }

  printf("\r\n");

  printf("dst: %s [%c]\r\n", setup->dst, setup->dst_asciimode);

  printf("verify: %s\r\n", (setup->verifyflag)?"ON":"OFF");

  #endif

  /* must have at least one source */

  if (setup->src_count == 0) {

    outputnl("Required parameter missing");

    return(-1);

  }

  /* perform the operation based on setup directives:

   * iterate over every source and copy it to dest */

  for (i = 0; i < setup->src_count; i++) {

    unsigned short t;

    unsigned short databuflen;

    unsigned short pathendoffset;

    /* resolve truename of src and write it to buffer */

    t = file_truename(setup->src[i], setup->databuf);

    if (t != 0) {

      output(setup->src[i]);

      output(" - ");

      outputnl(doserr(t));

      continue;

    }

    databuflen = strlen(setup->databuf); /* remember databuf length */

    /* if length zero, skip (not sure why this would be possible, though) */

    if (databuflen == 0) continue;

    /* if src does not end with a backslash AND it is a directory then append a backslash */

    databuflen = path_appendbkslash_if_dir(setup->databuf);

    /* if src ends with a '\' then append *.* */

    if (setup->databuf[databuflen - 1] == '\\') {

      strcat(setup->databuf, "*.*");

    }

    /* remember where the path in databuf ends */

    for (t = 0; setup->databuf[t] != 0; t++) {

      if (setup->databuf[t] == '\\') pathendoffset = t + 1;

    }

    /* */

    if (findfirst(dta, setup->databuf, 0) != 0) {

      continue;

    }

    do {

      char appendflag;

      if (dta->attr & DOS_ATTR_DIR) continue; /* skip directories */

      /* compute full path/name of the file */

      strcpy(setup->databuf + pathendoffset, dta->fname);

      /* if there was no destination, then YOU are the destination now!

       * this handles situations like COPY a.txt+b.txt+c.txt */

      if (setup->dst[0] == NULL) {

        strcpy(setup->dst, setup->databuf);

        setup->dstlen = strlen(setup->dst);

        copiedcount_in++;

        copiedcount_out++;

        continue;

      }

      /* is dst ending with a backslash? then append fname to it */

      if (setup->dst[setup->dstlen - 1] == '\\') strcpy(setup->dst + setup->dstlen, dta->fname);

      /* now databuf contains the full source and dst contains the full dest... COPY TIME! */

      /* if dst file exists already -> overwrite it or append?

          - if dst is a dir (dstlen-1 points at a \\) -> overwrite

          - otherwise: if copiedcount_in==0 overwrite, else append */

      output(setup->databuf);

      if ((setup->dst[setup->dstlen - 1] == '\\') || (copiedcount_in == 0)) {

        appendflag = 0;

        output(" > ");

        copiedcount_out++;

      } else {

        appendflag = 1;

        output(" >> ");

      }

      outputnl(setup->dst);

      // TODO: reusing setup->databuf not good idea: when 2+ files are being copied, the content of the first one overwrites the pathname of the second one!

      t = cmd_copy_internal(setup->dst, 0, setup->databuf, 0, appendflag, setup->databuf, setup->databufsz);

      if (t != 0) {

        outputnl(doserr(t));

        return(-1);

      }

      copiedcount_in++;

    } while (findnext(dta) == 0);

  }

  sprintf(setup->databuf, "%u file(s) copied", copiedcount_out);

  outputnl(setup->databuf);

  return(-1);

}