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.

 */

/*

 * time [time]

 */

/* read a one or two digit number and write it to buff */

static int cmd_time_get_item(char *buff, const char *s) {

  unsigned short i;

  for (i = 0; i < 3; i++) {

    if ((s[i] < '0') || (s[i] > '9')) {

      buff[i] = 0;

      return(0);

    }

    buff[i] = s[i];

  }

  /* err */

  *buff = 0;

  return(-1);

}

/* parse a NULL-terminated string int hour, minutes and seconds, returns 0 on success

 * valid inputs: 0, 7, 5:5, 23:23, 17:54:45, 9p, 9:05, ...

 */

static int cmd_time_parse(const char *s, signed char *ho, signed char *mi, signed char *se, struct nls_patterns *nls) {

  unsigned short i;

  const char *ptrs[2] = {NULL, NULL}; /* minutes, seconds */

  char buff[3];

  char ampm = 0;

  *ho = -1;

  *mi = 0;

  *se = 0;

  /* validate input - must contain only chars 0-9, time separator and 'a' or 'p' */

  for (i = 0; s[i] != 0; i++) {

    switch (s[i]) {

      case '0':

      case '1':

      case '2':

      case '3':

      case '4':

      case '5':

      case '6':

      case '7':

      case '8':

      case '9':

        break;

      case 'a':

      case 'A':

      case 'p':

      case 'P':

        /* these can be only at last position and never at the first */

        if ((s[i + 1] != 0) || (i == 0)) return(-1);

        ampm = s[i];

        if (ampm >= 'a') ampm -= ('a' - 'A');

        break;

      default:

        if ((s[i] != nls->timesep[0]) || (i == 0)) return(-1);

        if (ptrs[0] == NULL) {

          ptrs[0] = s + i + 1;

        } else if (ptrs[1] == NULL) {

          ptrs[1] = s + i + 1;

        } else { /* too many separators */

          return(-1);

        }

        break;

    }

  }

  /* read hour */

  if (cmd_time_get_item(buff, s) != 0) goto FAIL;

  if (atous(&i, buff) != 0) goto FAIL;

  *ho = i;

  /* if minutes provided, read them */

  if (ptrs[0] != NULL) {

    if (cmd_time_get_item(buff, ptrs[0]) != 0) goto FAIL;

    if (atous(&i, buff) != 0) goto FAIL;

    *mi = i;

  }

  /* if seconds provided, read them */

  if (ptrs[1] != NULL) {

    if (cmd_time_get_item(buff, ptrs[1]) != 0) goto FAIL;

    if (atous(&i, buff) != 0) goto FAIL;

    *se = i;

  }

  /* validate ranges */

  if ((*ho > 23) || (*mi > 59) || (*se > 59)) goto FAIL;

  /* am? */

  if ((ampm == 'A') && (*ho > 12)) goto FAIL;

  if ((ampm == 'A') && (*ho == 12)) *ho = 0; /* 12:00am is 00:00 (midnight) */

  /* pm? */

  if (ampm == 'P') {

    if (*ho > 12) goto FAIL;

    if (*ho < 12) *ho += 12;

  }

  return(0);

  FAIL:

  *ho = -1;

  return(-1);

}

static enum cmd_result cmd_time(struct cmd_funcparam *p) {

  struct nls_patterns *nls = (void *)(p->BUFFER);

  char *buff = p->BUFFER + sizeof(*nls);

  unsigned short i;

  signed char ho = -1, mi = -1, se = -1;

  if (cmd_ishlp(p)) {

    outputnl("Displays or sets the system time.");

    outputnl("");

    outputnl("TIME [time]");

    outputnl("");

    outputnl("Type TIME with no parameters to display the current time and a prompt for a");

    outputnl("new one. Press ENTER to keep the same time.");

    return(CMD_OK);

  }

  i = nls_getpatterns(nls);

  if (i != 0) {

    outputnl(doserr(i));

    return(CMD_FAIL);

  }

  /* display current time if no args */

  if (p->argc == 0) {

    /* get cur time */

    _asm {

      push ax

      push bx

      push cx

      push dx

      mov ah, 0x2c  /* DOS 1+ -- Query DOS Time */

      int 0x21      /* CH=hour CL=minutes DH=seconds DL=1/100sec */

      mov [ho], ch

      mov [mi], cl

      mov [se], dh

      pop dx

      pop cx

      pop bx

      pop ax

    }

    buff[0] = ' ';

    nls_format_time(buff + 1, ho, mi, se, nls);

    output("Current time is");

    outputnl(buff);

    ho = -1;

  } else { /* parse time if provided */

    if (cmd_time_parse(p->argv[0], &ho, &mi, &se, nls) != 0) {

      outputnl("Invalid time");

      ho = -1;

    }

  }

  /* ask for time if not provided or if input was malformed */

  while (ho < 0) {

    output("Enter new time:");

    output(" ");

    /* collect user input into buff */

    _asm {

      push ax

      push bx

      push dx

      mov ah, 0x0a   /* DOS 1+ -- Buffered String Input */

      mov bx, buff

      mov dx, bx

      mov al, 16

      mov [bx], al   /* max input length */

      mov al, 1

      mov [bx+1], al /* zero out the "previous entry" length */

      int 0x21

      /* terminate the string with a NULL terminator */

      xor ax, ax

      inc bx

      mov al, [bx] /* read length of input string */

      mov bx, ax

      add bx, dx

      mov [bx+2], ah

      /* output a \n */

      mov ah, 2

      mov dl, 0x0A

      int 0x21

      pop dx

      pop bx

      pop ax

    }

    if (buff[1] == 0) break; /* empty string = do not change time */

    if (cmd_time_parse(buff + 2, &ho, &mi, &se, nls) == 0) break;

    outputnl("Invalid time");

    return(CMD_FAIL);

  }

  if (ho >= 0) {

    /* set time */

    _asm {

      push ax

      push bx

      push cx

      push dx

      mov ah, 0x2d   /* DOS 1+ -- Set DOS Time */

      mov ch, [ho]   /* hour (0-23) */

      mov cl, [mi]   /* minutes (0-59) */

      mov dh, [se]   /* seconds (0-59) */

      mov dl, 0      /* 1/100th seconds (0-99) */

      int 0x21

      pop dx

      pop cx

      pop bx

      pop ax

    }

  }

  return(CMD_OK);

}