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- /* $Header: /home/hyperion/mu/christos/src/sys/tcsh-6.00/RCS/tw.spell.c,v 3.2 1991/07/15 19:37:24 christos Exp $ */
- /*
- * tw.spell.c: Spell check words
- */
- /*-
- * Copyright (c) 1980, 1991 The Regents of the University of California.
- * 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. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University 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 THE REGENTS 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 THE REGENTS 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"
- RCSID("$Id: tw.spell.c,v 3.2 1991/07/15 19:37:24 christos Exp $")
-
- #include "sh.h"
- #include "tw.h"
-
- #ifdef __MINT__
- extern Char *Lastslash();
- #endif
-
- extern Char **command_list;
- extern int numcommands;
-
- /* spell_me : return corrrectly spelled filename. From K&P spname */
- int
- spell_me(oldname, oldsize, looking_for_cmd)
- Char *oldname;
- int oldsize, looking_for_cmd;
- {
- /* The +1 is to fool hp's optimizer */
- Char guess[FILSIZ + 1], newname[FILSIZ + 1];
- register Char *new = newname, *old = oldname;
- register Char *p, *cp, *ws;
- bool foundslash = 0;
- int retval;
-
- #ifdef __MINT__
- /* skip drive specification, if any */
- if (*old && old[1] == ':' && is_dirsep(old[2])) {
- *new++ = *old++; *new++ = *old++;
- }
- #endif
-
- for (;;) {
- #ifdef __MINT__
- while (is_dirsep(*old)) {
- #else
- while (*old == '/') { /* skip '/' */
- #endif
- *new++ = *old++;
- foundslash = 1;
- }
- /* do not try to correct spelling of single letter words */
- if (*old != '\0' && old[1] == '\0')
- *new++ = *old++;
- *new = '\0';
- if (*old == '\0') {
- retval = (StrQcmp(oldname, newname) != 0);
- copyn(oldname, newname, oldsize); /* shove it back. */
- return retval;
- }
- p = guess; /* start at beginning of buf */
- if (newname[0]) /* add current dir if any */
- for (cp = newname; *cp; cp++)
- if (p < guess + FILSIZ)
- *p++ = *cp;
- ws = p;
- #ifdef __MINT__
- for (; !is_dirsep(*old) && *old != '\0'; old++)
- #else
- for (; *old != '/' && *old != '\0'; old++)/* add current file name */
- #endif
- if (p < guess + FILSIZ)
- *p++ = *old;
- *p = '\0'; /* terminate it */
-
- /*
- * Don't tell t_search we're looking for cmd if no '/' in the name so
- * far but there are later - or it will look for *all* commands
- */
- /* (*should* say "looking for directory" whenever '/' is next...) */
- #ifdef __MINT__
- retval = t_search(guess, p, SPELL, FILSIZ,
- looking_for_cmd && (foundslash || !is_dirsep(*old)), 1);
- #else
- retval = t_search(guess, p, SPELL, FILSIZ,
- looking_for_cmd && (foundslash || *old != '/'), 1);
- #endif
- if (retval >= 4 || retval < 0)
- return -1; /* hopeless */
- for (p = ws; *new = *p++;)
- new++;
- }
- /*NOTREACHED*/
- #ifdef notdef
- return (0); /* lint on the vax under mtXinu complains! */
- #endif
- }
-
- #define EQ(s,t) (StrQcmp(s,t) == 0)
-
- /*
- * spdist() is taken from Kernighan & Pike,
- * _The_UNIX_Programming_Environment_
- * and adapted somewhat to correspond better to psychological reality.
- * (Note the changes to the return values)
- *
- * According to Pollock and Zamora, CACM April 1984 (V. 27, No. 4),
- * page 363, the correct order for this is:
- * OMISSION = TRANSPOSITION > INSERTION > SUBSTITUTION
- * thus, it was exactly backwards in the old version. -- PWP
- */
-
- int
- spdist(s, t)
- register Char *s, *t;
- {
- for (; (*s & TRIM) == (*t & TRIM); t++, s++)
- if (*t == '\0')
- return 0; /* exact match */
- if (*s) {
- if (*t) {
- if (s[1] && t[1] && (*s & TRIM) == (t[1] & TRIM) &&
- (*t & TRIM) == (s[1] & TRIM) && EQ(s + 2, t + 2))
- return 1; /* transposition */
- if (EQ(s + 1, t + 1))
- return 3; /* 1 char mismatch */
- }
- if (EQ(s + 1, t))
- return 2; /* extra character */
- }
- if (*t && EQ(s, t + 1))
- return 1; /* missing character */
- return 4;
- }
-
- int
- spdir(extended_name, tilded_dir, entry, name)
- Char *extended_name;
- Char *tilded_dir;
- Char *entry;
- Char *name;
- {
- Char path[1024];
- Char *s;
- Char oldch;
-
- for (s = name; *s != 0 && (*s & TRIM) == (*entry & TRIM); s++, entry++);
- if (*s == 0 || s[1] == 0 || *entry != 0)
- return 0;
-
- (void) Strcpy(path, tilded_dir);
- oldch = *s;
- *s = '/';
- catn(path, name, sizeof(path) / sizeof(Char));
- if (access(short2str(path), F_OK) == 0) {
- (void) Strcpy(extended_name, name);
- return 1;
- }
- *s = oldch;
- return 0;
- }
-