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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)) {
73 ap->val = savestr(val);
76 size_t len = strlen(val);
77 ap->val = ckmalloc(len + 2);
78 memcpy(ap->val, val, len);
80 ap->val[len+1] = '\0';
89 ap = ckmalloc(sizeof (struct alias));
90 ap->name = savestr(name);
92 * XXX - HACK: in order that the parser will not finish reading the
93 * alias value off the input before processing the next alias, we
94 * dummy up an extra space at the end of the alias. This is a crock
95 * and should be re-thought. The idea (if you feel inclined to help)
96 * is to avoid alias recursions. The mechanism used is: when
97 * expanding an alias, the value of the alias is pushed back on the
98 * input as a string and a pointer to the alias is stored with the
99 * string. The alias is marked as being in use. When the input
100 * routine finishes reading the string, it marks the alias not
101 * in use. The problem is synchronization with the parser. Since
102 * it reads ahead, the alias is marked not in use before the
103 * resulting token(s) is next checked for further alias sub. The
104 * H A C K is that we add a little fluff after the alias value
105 * so that the string will not be exhausted. This is a good
106 * idea ------- ***NOT***
109 ap->val = savestr(val);
112 size_t len = strlen(val);
113 ap->val = ckmalloc(len + 2);
114 memcpy(ap->val, val, len);
115 ap->val[len] = ' '; /* fluff */
116 ap->val[len+1] = '\0';
127 unalias(const char *name)
129 struct alias *ap, **app;
131 app = hashalias(name);
133 for (ap = *app; ap; app = &(ap->next), ap = ap->next) {
134 if (equal(name, ap->name)) {
136 * if the alias is currently in use (i.e. its
137 * buffer is being used by the input routine) we
138 * just null out the name instead of freeing it.
139 * We could clear it out later, but this situation
140 * is so rare that it hardly seems worth it.
142 if (ap->flag & ALIASINUSE)
163 struct alias *ap, *tmp;
167 for (i = 0; i < ATABSIZE; i++) {
183 lookupalias(const char *name, int check)
185 struct alias *ap = *hashalias(name);
187 for (; ap; ap = ap->next) {
188 if (equal(name, ap->name)) {
189 if (check && (ap->flag & ALIASINUSE))
199 comparealiases(const void *p1, const void *p2)
201 const struct alias *const *a1 = p1;
202 const struct alias *const *a2 = p2;
204 return strcmp((*a1)->name, (*a2)->name);
208 printalias(const struct alias *a)
212 out1fmt("%s=", a->name);
213 /* Don't print the space added above. */
214 p = a->val + strlen(a->val) - 1;
225 struct alias **sorted, *ap;
228 sorted = ckmalloc(aliases * sizeof(*sorted));
230 for (i = 0; i < ATABSIZE; i++)
231 for (ap = atab[i]; ap; ap = ap->next)
232 if (*ap->name != '\0')
234 qsort(sorted, aliases, sizeof(*sorted), comparealiases);
235 for (i = 0; i < aliases; i++) {
236 printalias(sorted[i]);
245 aliascmd(int argc, char **argv)
255 while ((n = *++argv) != NULL) {
256 if ((v = strchr(n+1, '=')) == NULL) /* n+1: funny ksh stuff */
257 if ((ap = lookupalias(n, 0)) == NULL) {
258 warning("%s: not found", n);
272 unaliascmd(int argc __unused, char **argv __unused)
276 while ((i = nextopt("a")) != '\0') {
282 for (i = 0; *argptr; argptr++)
283 i |= unalias(*argptr);
288 static struct alias **
289 hashalias(const char *p)
291 unsigned int hashval;
296 return &atab[hashval % ATABSIZE];