env: re-add support for auto-completion

Currently, only basic completion is supported (no globs), but this is
what we had previously.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>

1 files changed, 15 insertions, 25 deletions

diff --git a/common/env_common.c b/common/env_common.c
index ae710e5e6..c3e6388ac 100644
--- a/common/env_common.c
+++ b/common/env_common.c
@@ -246,42 +246,32 @@ void env_relocate (void)
 	}
 }
 
-#if 0 /* need to reimplement - def CONFIG_AUTO_COMPLETE */
+#ifdef CONFIG_AUTO_COMPLETE
 int env_complete(char *var, int maxv, char *cmdv[], int bufsz, char *buf)
 {
-	int i, nxt, len, vallen, found;
-	const char *lval, *rval;
+	ENTRY *match;
+	int found, idx;
 
+	idx = 0;
 	found = 0;
 	cmdv[0] = NULL;
 
-	len = strlen(var);
-	/* now iterate over the variables and select those that match */
-	for (i=0; env_get_char(i) != '\0'; i=nxt+1) {
+	while ((idx = hmatch_r(var, idx, &match, &env_htab))) {
+		int vallen = strlen(match->key) + 1;
 
-		for (nxt=i; env_get_char(nxt) != '\0'; ++nxt)
-			;
-
-		lval = (char *)env_get_addr(i);
-		rval = strchr(lval, '=');
-		if (rval != NULL) {
-			vallen = rval - lval;
-			rval++;
-		} else
-			vallen = strlen(lval);
-
-		if (len > 0 && (vallen < len || memcmp(lval, var, len) != 0))
-			continue;
-
-		if (found >= maxv - 2 || bufsz < vallen + 1) {
-			cmdv[found++] = "...";
+		if (found >= maxv - 2 || bufsz < vallen)
 			break;
-		}
+
 		cmdv[found++] = buf;
-		memcpy(buf, lval, vallen); buf += vallen; bufsz -= vallen;
-		*buf++ = '\0'; bufsz--;
+		memcpy(buf, match->key, vallen);
+		buf += vallen;
+		bufsz -= vallen;
 	}
 
+	qsort(cmdv, found, sizeof(cmdv[0]), strcmp_compar);
+
+	if (idx)
+		cmdv[found++] = "...";
 	cmdv[found] = NULL;
 	return found;
 }