[svn-upgrade] Integrating new upstream version, shadow (19990709)

libmisc/fields.c

@@ -0,0 +1,104 @@
+/*
+ * 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,v 1.5 1997/12/07 23:27:04 marekm Exp $")
+
+#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';
+	}
+}