Subversion Repositories SvarDOS

/*

 * set [varname[=value]]

 *

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

 * varname can also contain spaces

 */

static int cmd_set(struct cmd_funcparam *p) {

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

  char *buff = p->BUFFER;

  if (cmd_ishlp(p)) {

    outputnl("Displays, sets, or removes DOS environment variables");

    outputnl("");

    outputnl("SET [variable=[string]]");

    outputnl("");

    outputnl("variable  Specifies the environment-variable name");

    outputnl("string    Specifies a series of characters to assign to the variable");

    outputnl("");

    outputnl("Type SET without parameters to display the current environment variables.");

  }

  /* 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 == '\r') goto syntax_err;

      buff[i] = *ptr;

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

      i++;

    }

    /* copy value now */

    while (*ptr != '\r') {

      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) outputnl("Not enough available space within the environment block");

  }

  return(-1);

  syntax_err:

  outputnl("Syntax error");

  return(-1);

}