wordlist *
cp_bquote(wordlist *wlist)
{
wordlist *wl, *nwl;
char *s, *t, buf[BSIZE_SP], wbuf[BSIZE_SP], tbuf[BSIZE_SP];
int i;
for (wl = wlist; wl; wl = wl->wl_next) {
t = wl->wl_word;
if (!t)
continue;
i = 0;
loop:
s = strchr(t, cp_back);
if (s == NULL)
continue;
while (t < s)
wbuf[i++] = *t++;
wbuf[i] = '\0';
t++;
s = buf;
/* Get s and t past the next backquote. */
while (*t && (*t != cp_back))
*s++ = *t++;
/* What the heck, let "echo `foo" work... */
*s = '\0';
t++; /* Get past the second ` */
if ((nwl = backeval(buf)) == NULL) {
wlist->wl_word = NULL;
return (wlist);
}
(void) strcpy(buf, wbuf);
if (nwl->wl_word) {
(void) strcat(buf, nwl->wl_word);
tfree(nwl->wl_word);
}
nwl->wl_word = copy(buf);
(void) strcpy(tbuf, t);
wl = wl_splice(wl, nwl);
for (wlist = wl; wlist->wl_prev; wlist = wlist->wl_prev)
;
/* MW. We must move to the begging of new wordlist. */
(void) strcpy(buf, wl->wl_word);
i = (int) strlen(buf);
(void) strcat(buf, tbuf);
tfree(wl->wl_word);
wl->wl_word = copy(buf);
t = &wl->wl_word[i];
s = wl->wl_word;
for (i = 0; s < t; s++)
wbuf[i++] = *s;
goto loop;
}
return (wlist);
}
/* Substitute variable name by its value and restore to wordlist */
wordlist *
cp_variablesubst(wordlist *wlist)
{
wordlist *wl;
for (wl = wlist; wl; wl = wl->wl_next) {
char *s_dollar;
int i = 0;
while ((s_dollar = strchr(wl->wl_word + i, cp_dol)) != NULL) {
int prefix_len = (int) (s_dollar - wl->wl_word);
char *tail = span_var_expr(s_dollar + 1);
char *var = copy_substring(s_dollar + 1, tail);
wordlist *nwl = vareval(var);
tfree(var);
if (nwl) {
char *x = nwl->wl_word;
char *tail_ = copy(tail);
nwl->wl_word = tprintf("%.*s%s", prefix_len, wl->wl_word, nwl->wl_word);
free(x);
if (wlist == wl)
wlist = nwl;
wl = wl_splice(wl, nwl);
i = (int) strlen(wl->wl_word);
x = wl->wl_word;
wl->wl_word = tprintf("%s%s", wl->wl_word, tail_);
free(x);
free(tail_);
} else if (prefix_len || *tail) {
char *x = wl->wl_word;
wl->wl_word = tprintf("%.*s%s", prefix_len, wl->wl_word, tail);
i = prefix_len;
free(x);
} else {
wordlist *next = wl->wl_next;
if (wlist == wl)
wlist = next;
wl_delete_slice(wl, next);
if (!next)
return wlist;
wl = next;
i = 0;
}
}
}
return (wlist);
}