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-rw-r--r--lib/fields.c107
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
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+/*
+ * 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';
+ }
+}
+