a926a26f0c
* lib/fields.c (change_field): Don't point before array start; that has undefined behavior. Signed-off-by: Paul Eggert <eggert@cs.ucla.edu> Signed-off-by: Alejandro Colomar <alx@kernel.org> Reviewed-by: Iker Pedrosa <ipedrosa@redhat.com>
107 lines
2.1 KiB
C
107 lines
2.1 KiB
C
/*
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* SPDX-FileCopyrightText: 1990 , Julianne Frances Haugh
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* SPDX-FileCopyrightText: 1996 - 1997, Marek Michałkiewicz
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* SPDX-FileCopyrightText: 2003 - 2005, Tomasz Kłoczko
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* SPDX-FileCopyrightText: 2007 , Nicolas François
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <config.h>
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#ident "$Id$"
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#include <ctype.h>
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#include <string.h>
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#include <stdio.h>
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#include "prototypes.h"
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/*
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* valid_field - insure that a field contains all legal characters
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*
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* The supplied field is scanned for non-printable and other illegal
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* characters.
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* + -1 is returned if an illegal character is present.
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* + 1 is returned if no illegal characters are present, but the field
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* contains a non-printable character.
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* + 0 is returned otherwise.
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*/
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int valid_field (const char *field, const char *illegal)
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{
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const char *cp;
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int err = 0;
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if (NULL == field) {
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return -1;
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}
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/* For each character of field, search if it appears in the list
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* of illegal characters. */
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for (cp = field; '\0' != *cp; cp++) {
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if (strchr (illegal, *cp) != NULL) {
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err = -1;
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break;
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}
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}
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if (0 == err) {
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/* Search if there are some non-printable characters */
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for (cp = field; '\0' != *cp; cp++) {
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if (!isprint (*cp)) {
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err = 1;
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break;
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}
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}
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}
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return err;
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}
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/*
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* change_field - change a single field if a new value is given.
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*
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* prompt the user with the name of the field being changed and the
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* current value.
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*/
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void change_field (char *buf, size_t maxsize, const char *prompt)
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{
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char newf[200];
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char *cp;
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if (maxsize > sizeof (newf)) {
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maxsize = sizeof (newf);
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}
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printf ("\t%s [%s]: ", prompt, buf);
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(void) fflush (stdout);
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if (fgets (newf, maxsize, stdin) != newf) {
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return;
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}
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cp = strchr (newf, '\n');
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if (NULL == cp) {
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return;
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}
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*cp = '\0';
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if ('\0' != newf[0]) {
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/*
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* Remove leading and trailing whitespace. This also
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* makes it possible to change the field to empty, by
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* entering a space. --marekm
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*/
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while (newf < cp && isspace (cp[-1])) {
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cp--;
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}
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*cp = '\0';
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cp = newf;
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while (isspace (*cp)) {
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cp++;
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}
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strcpy (buf, cp);
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}
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}
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