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35 static char sccsid[] = "@(#)alias.c 8.3 (Berkeley) 5/4/95";
38 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD$");
48 #include "options.h" /* XXX for argptr (should remove?) */
53 static struct alias *atab[ATABSIZE];
56 static void setalias(const char *, const char *);
57 static int unalias(const char *);
58 static struct alias **hashalias(const char *);
62 setalias(const char *name, const char *val)
64 struct alias *ap, **app;
66 app = hashalias(name);
67 for (ap = *app; ap; ap = ap->next) {
68 if (equal(name, ap->name)) {
71 ap->val = savestr(val);
78 ap = ckmalloc(sizeof (struct alias));
79 ap->name = savestr(name);
80 ap->val = savestr(val);
89 unalias(const char *name)
91 struct alias *ap, **app;
93 app = hashalias(name);
95 for (ap = *app; ap; app = &(ap->next), ap = ap->next) {
96 if (equal(name, ap->name)) {
98 * if the alias is currently in use (i.e. its
99 * buffer is being used by the input routine) we
100 * just null out the name instead of freeing it.
101 * We could clear it out later, but this situation
102 * is so rare that it hardly seems worth it.
104 if (ap->flag & ALIASINUSE)
125 struct alias *ap, *tmp;
129 for (i = 0; i < ATABSIZE; i++) {
145 lookupalias(const char *name, int check)
151 for (ap = *hashalias(name); ap; ap = ap->next) {
152 if (equal(name, ap->name)) {
153 if (check && (ap->flag & ALIASINUSE))
163 comparealiases(const void *p1, const void *p2)
165 const struct alias *const *a1 = p1;
166 const struct alias *const *a2 = p2;
168 return strcmp((*a1)->name, (*a2)->name);
172 printalias(const struct alias *a)
174 out1fmt("%s=", a->name);
183 struct alias **sorted, *ap;
186 sorted = ckmalloc(aliases * sizeof(*sorted));
188 for (i = 0; i < ATABSIZE; i++)
189 for (ap = atab[i]; ap; ap = ap->next)
190 if (*ap->name != '\0')
192 qsort(sorted, aliases, sizeof(*sorted), comparealiases);
193 for (i = 0; i < aliases; i++) {
194 printalias(sorted[i]);
203 aliascmd(int argc __unused, char **argv __unused)
211 if (*argptr == NULL) {
215 while ((n = *argptr++) != NULL) {
216 if ((v = strchr(n+1, '=')) == NULL) /* n+1: funny ksh stuff */
217 if ((ap = lookupalias(n, 0)) == NULL) {
218 warning("%s: not found", n);
232 unaliascmd(int argc __unused, char **argv __unused)
236 while ((i = nextopt("a")) != '\0') {
242 for (i = 0; *argptr; argptr++)
243 i |= unalias(*argptr);
248 static struct alias **
249 hashalias(const char *p)
251 unsigned int hashval;
253 hashval = (unsigned char)*p << 4;
256 return &atab[hashval % ATABSIZE];