shadow/libmisc/fields.c

99 lines
2.9 KiB
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>
#ident "$Id$"
#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';
}
}