Subversion Repositories SvarDOS

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

 * of the MIT license.

 *

 * Copyright (C) 2021-2022 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.

 */

/*

 * set [varname[=value]]

 *

 * value cannot contain any '=' character, but it can contain spaces

 * varname can also contain spaces

 */

static enum cmd_result cmd_set(struct cmd_funcparam *p) {

  char far *env = MK_FP(p->env_seg, 0);

  char *buff = p->BUFFER;

  if (cmd_ishlp(p)) {

    nls_outputnl(23,0); /* "Displays, sets, or removes DOS environment variables"); */

    outputnl("");

    nls_outputnl(23,1); /* "SET [variable=[string]]" */

    outputnl("");

    nls_outputnl(23,2); /* "variable  Specifies the environment-variable name" */

    nls_outputnl(23,3); /* "string    Specifies a series of characters to assign to the variable" */

    outputnl("");

    nls_outputnl(23,4); /* "Type SET without parameters to display the current environment variables." */

    return(CMD_OK);

  }

  /* no arguments - display content */

  if (p->argc == 0) {

    while (*env != 0) {

      unsigned short i;

      /* copy string to local buff for display */

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

        buff[i] = *env;

        env++;

        if (buff[i] == 0) break;

      }

      outputnl(buff);

    }

  } else { /* set variable (do not rely on argv, SET has its own rules...) */

    const char far *ptr;

    unsigned short i;

    /* locate the first space */

    for (ptr = p->cmdline; *ptr != ' '; ptr++);

    /* now locate the first non-space: that's where the variable name begins */

    for (; *ptr == ' '; ptr++);

    /* copy variable to buff and switch it upercase */

    i = 0;

    for (; *ptr != '='; ptr++) {

      if (*ptr == 0) goto syntax_err;

      buff[i] = *ptr;

      if ((buff[i] >= 'a') && (buff[i] <= 'z')) buff[i] -= ('a' - 'A');

      i++;

    }

    /* copy value now */

    while (*ptr != 0) {

      buff[i++] = *ptr;

      ptr++;

    }

    /* terminate buff */

    buff[i] = 0;

    /* commit variable to environment */

    i = env_setvar(p->env_seg, buff);

    if (i == ENV_INVSYNT) goto syntax_err;

    if (i == ENV_NOTENOM) {

      nls_outputnl(23,5); /* "Not enough available space within the environment block" */

      return(CMD_FAIL);

    }

  }

  return(CMD_OK);

  syntax_err:

  nls_outputnl(0,1); /* "Invalid syntax" */

  return(CMD_FAIL);

}