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Diffstat (limited to '')
-rw-r--r-- | lib/fields.c | 107 |
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'; + } +} + |