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fields.c

/*
 * Copyright 1990, Julianne Frances Haugh
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of Julianne F. Haugh nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY JULIE HAUGH AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL JULIE HAUGH OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <config.h>

#include "rcsid.h"
RCSID("$Id: fields.c 6 2005-03-20 15:34:28Z bubulle $")

#include <ctype.h>
#include <string.h>
#include <stdio.h>
#include "prototypes.h"

/*
 * valid_field - insure that a field contains all legal characters
 *
 * The supplied field is scanned for non-printing and other illegal
 * characters.  If any illegal characters are found, valid_field
 * returns -1.  Zero is returned for success.
 */

int
valid_field(const char *field, const char *illegal)
{
      const char *cp;

      for (cp = field; *cp && isprint(*cp & 0x7F) && !strchr(illegal, *cp); cp++)
            ;

      if (*cp)
            return -1;
      else
            return 0;
}

/*
 * change_field - change a single field if a new value is given.
 *
 * prompt the user with the name of the field being changed and the
 * current value.
 */

void
change_field(char *buf, size_t maxsize, const char *prompt)
{
      char newf[200];
      char *cp;

      if (maxsize > sizeof(newf))
            maxsize = sizeof(newf);

      printf ("\t%s [%s]: ", prompt, buf);
      if (fgets(newf, maxsize, stdin) != newf)
            return;

      if (!(cp = strchr(newf, '\n')))
            return;
      *cp = '\0';

      if (newf[0]) {
            /*
             * Remove leading and trailing whitespace.  This also
             * makes it possible to change the field to empty, by
             * entering a space.  --marekm
             */

            while (--cp >= newf && isspace(*cp))
                  ;
            *++cp = '\0';

            cp = newf;
            while (*cp && isspace(*cp))
                  cp++;

            strncpy(buf, cp, maxsize - 1);
            buf[maxsize - 1] = '\0';
      }
}

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