1 files changed, 107 insertions, 0 deletions
diff --git a/lib/fields.c b/lib/fields.c
new file mode 100644
index 0000000..8a56035
--- /dev/null
+++ b/lib/fields.c
@@ -0,0 +1,107 @@
+/*
+ * SPDX-FileCopyrightText: 1990       , Julianne Frances Haugh
+ * SPDX-FileCopyrightText: 1996 - 1997, Marek Michałkiewicz
+ * SPDX-FileCopyrightText: 2003 - 2005, Tomasz Kłoczko
+ * SPDX-FileCopyrightText: 2007       , Nicolas François
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#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-printable and other illegal
+ * characters.
+ *  + -1 is returned if an illegal character is present.
+ *  +  1 is returned if no illegal characters are present, but the field
+ *       contains a non-printable character.
+ *  +  0 is returned otherwise.
+ */
+int valid_field (const char *field, const char *illegal)
+{
+	const char *cp;
+	int err = 0;
+
+	if (NULL == field) {
+		return -1;
+	}
+
+	/* For each character of field, search if it appears in the list
+	 * of illegal characters. */
+	for (cp = field; '\0' != *cp; cp++) {
+		if (strchr (illegal, *cp) != NULL) {
+			err = -1;
+			break;
+		}
+	}
+
+	if (0 == err) {
+		/* Search if there are some non-printable characters */
+		for (cp = field; '\0' != *cp; cp++) {
+			if (!isprint (*cp)) {
+				err = 1;
+				break;
+			}
+		}
+	}
+
+	return err;
+}
+
+/*
+ * 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);
+	(void) fflush (stdout);
+	if (fgets (newf, (int) maxsize, stdin) != newf) {
+		return;
+	}
+
+	cp = strchr (newf, '\n');
+	if (NULL == cp) {
+		return;
+	}
+	*cp = '\0';
+
+	if ('\0' != 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++;
+		*cp = '\0';
+
+		cp = newf;
+		while (('\0' != *cp) && isspace (*cp)) {
+			cp++;
+		}
+
+		strncpy (buf, cp, maxsize - 1);
+		buf[maxsize - 1] = '\0';
+	}
+}
+