ref: 440ccbc06007422f04943378260f250f9efa5331
dir: /sys/src/cmd/upas/send/dest.c/
#include "common.h"
#include "send.h"
/* exports */
dest *dlist;
dest*
d_new(String *addr)
{
dest *dp;
dp = (dest *)mallocz(sizeof(dest), 1);
if (dp == 0)
sysfatal("malloc: %r");
dp->same = dp;
dp->nsame = 1;
dp->nchar = 0;
dp->next = dp;
dp->addr = escapespecial(addr);
dp->parent = 0;
dp->repl1 = dp->repl2 = 0;
dp->status = d_undefined;
return dp;
}
void
d_free(dest *dp)
{
if (dp != 0) {
s_free(dp->addr);
s_free(dp->repl1);
s_free(dp->repl2);
free((char *)dp);
}
}
/* The following routines manipulate an ordered list of items. Insertions
* are always to the end of the list. Deletions are from the beginning.
*
* The list are circular witht the `head' of the list being the last item
* added.
*/
/* Get first element from a circular list linked via 'next'. */
dest*
d_rm(dest **listp)
{
dest *dp;
if (*listp == 0)
return 0;
dp = (*listp)->next;
if (dp == *listp)
*listp = 0;
else
(*listp)->next = dp->next;
dp->next = dp;
return dp;
}
/* Insert a new entry at the end of the list linked via 'next'. */
void
d_insert(dest **listp, dest *new)
{
dest *head;
if (*listp == 0) {
*listp = new;
return;
}
if (new == 0)
return;
head = new->next;
new->next = (*listp)->next;
(*listp)->next = head;
*listp = new;
return;
}
/* Get first element from a circular list linked via 'same'. */
dest*
d_rm_same(dest **listp)
{
dest *dp;
if (*listp == 0)
return 0;
dp = (*listp)->same;
if (dp == *listp)
*listp = 0;
else
(*listp)->same = dp->same;
dp->same = dp;
return dp;
}
/* Look for a duplicate on the same list */
int
d_same_dup(dest *dp, dest *new)
{
dest *first = dp;
if(new->repl2 == 0)
return 1;
do {
if(strcmp(s_to_c(dp->repl2), s_to_c(new->repl2))==0)
return 1;
dp = dp->same;
} while(dp != first);
return 0;
}
/*
* Insert an entry into the corresponding list linked by 'same'. Note that
* the basic structure is a list of lists.
*/
void
d_same_insert(dest **listp, dest *new)
{
dest *dp;
int len;
if(new->status == d_pipe || new->status == d_cat) {
len = 0;
if(new->repl2)
len = strlen(s_to_c(new->repl2));
if(*listp != 0){
dp = (*listp)->next;
do {
if(dp->status == new->status
&& strcmp(s_to_c(dp->repl1), s_to_c(new->repl1))==0){
/* remove duplicates */
if(d_same_dup(dp, new))
return;
/* add to chain if chain small enough */
if(dp->nsame < MAXSAME
&& dp->nchar + len < MAXSAMECHAR){
new->same = dp->same;
dp->same = new;
dp->nchar += len + 1;
dp->nsame++;
return;
}
}
dp = dp->next;
} while (dp != (*listp)->next);
}
if(s_to_c(new->repl1))
new->nchar = strlen(s_to_c(new->repl1)) + len + 1;
else
new->nchar = 0;
}
new->next = new;
d_insert(listp, new);
}
/*
* Form a To: if multiple destinations.
* The local! and !local! checks are artificial intelligence,
* there should be a better way.
*/
String*
d_to(dest *list)
{
dest *np, *sp;
String *s;
int i, n;
char *cp;
s = s_new();
s_append(s, "To: ");
np = list;
i = n = 0;
do {
np = np->next;
sp = np;
do {
sp = sp->same;
cp = s_to_c(sp->addr);
/* hack to get local! out of the names */
if(strncmp(cp, "local!", 6) == 0)
cp += 6;
if(n > 20){ /* 20 to appease mailers complaining about long lines */
s_append(s, "\n\t");
n = 0;
}
if(i != 0){
s_append(s, ", ");
n += 2;
}
s_append(s, cp);
n += strlen(cp);
i++;
} while(sp != np);
} while(np != list);
return unescapespecial(s);
}
#define isspace(c) ((c)==' ' || (c)=='\t' || (c)=='\n')
/* Get the next field from a String. The field is delimited by white space.
* Anything delimited by double quotes is included in the string.
*/
static String*
s_parseq(String *from, String *to)
{
int c;
if (*from->ptr == '\0')
return 0;
if (to == 0)
to = s_new();
for (c = *from->ptr;!isspace(c) && c != 0; c = *(++from->ptr)){
s_putc(to, c);
if(c == '"'){
for (c = *(++from->ptr); c && c != '"'; c = *(++from->ptr))
s_putc(to, *from->ptr);
s_putc(to, '"');
if(c == 0)
break;
}
}
s_terminate(to);
/* crunch trailing white */
while(isspace(*from->ptr))
from->ptr++;
return to;
}
/* expand a String of destinations into a linked list of destiniations */
dest*
s_to_dest(String *sp, dest *parent)
{
String *addr;
dest *list=0;
dest *new;
if (sp == 0)
return 0;
addr = s_new();
while (s_parseq(sp, addr)!=0) {
addr = escapespecial(addr);
if(shellchars(s_to_c(addr))){
while(new = d_rm(&list))
d_free(new);
break;
}
new = d_new(addr);
new->parent = parent;
new->authorized = parent->authorized;
d_insert(&list, new);
addr = s_new();
}
s_free(addr);
return list;
}