[src/trunk]: src/sys/dev/ofw Rewrite of_compatible() using strlist_match().

[thorpej <thorpej%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/45771705b6c5
branches:  trunk
changeset: 958920:45771705b6c5
user:      thorpej <thorpej%NetBSD.org@localhost>
date:      Sun Jan 24 19:38:37 2021 +0000

description:
Rewrite of_compatible() using strlist_match().

diffstat:

 sys/dev/ofw/ofw_subr.c |  67 ++++++++++++++-----------------------------------
 1 files changed, 19 insertions(+), 48 deletions(-)

diffs (96 lines):

diff -r 4c5b7ea2f2bd -r 45771705b6c5 sys/dev/ofw/ofw_subr.c
--- a/sys/dev/ofw/ofw_subr.c    Sun Jan 24 19:35:21 2021 +0000
+++ b/sys/dev/ofw/ofw_subr.c    Sun Jan 24 19:38:37 2021 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: ofw_subr.c,v 1.46 2021/01/24 17:44:16 thorpej Exp $    */
+/*     $NetBSD: ofw_subr.c,v 1.47 2021/01/24 19:38:37 thorpej Exp $    */
 
 /*
  * Copyright 1998
@@ -34,7 +34,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: ofw_subr.c,v 1.46 2021/01/24 17:44:16 thorpej Exp $");
+__KERNEL_RCSID(0, "$NetBSD: ofw_subr.c,v 1.47 2021/01/24 19:38:37 thorpej Exp $");
 
 #include <sys/param.h>
 #include <sys/device.h>
@@ -101,60 +101,31 @@
 int
 of_compatible(int phandle, const char * const *strings)
 {
-
-       int len, olen, allocated, nstr, cstr, rv;
-       char *buf, sbuf[OFW_MAX_STACK_BUF_SIZE];
-       const char *sp, *nsp;
+       char *prop, propbuf[OFW_MAX_STACK_BUF_SIZE];
+       const char *cp;
+       int proplen, match, rv = -1;
 
-       len = OF_getproplen(phandle, "compatible");
-       if (len <= 0)
-               return (-1);
-
-       if (len > sizeof(sbuf)) {
-               buf = malloc(len, M_TEMP, M_WAITOK);
-               allocated = 1;
-       } else {
-               buf = sbuf;
-               allocated = 0;
+       proplen = OF_getproplen(phandle, "compatible");
+       if (proplen <= 0) {
+               return -1;
        }
 
-       /* 'compatible' size should not change. */
-       if (OF_getprop(phandle, "compatible", buf, len) != len) {
-               rv = -1;
+       prop = kmem_tmpbuf_alloc(proplen, propbuf, sizeof(propbuf), KM_SLEEP);
+
+       if (OF_getprop(phandle, "compatible", prop, proplen) != proplen) {
                goto out;
        }
 
-       /* count 'compatible' strings */
-       sp = buf;
-       nstr = 0;
-       olen = len;
-       while (len && (nsp = memchr(sp, 0, len)) != NULL) {
-               nsp++;                  /* skip over NUL char */
-               len -= (nsp - sp);
-               sp = nsp;
-               nstr++;
+       for (; (cp = *strings) != NULL; strings++) {
+               if ((match = strlist_match(prop, proplen, cp)) != 0) {
+                       rv = match - 1;
+                       break;
+               }
        }
-       len = olen;
 
-       sp = buf;
-       rv = nstr;
-       while (len && (nsp = memchr(sp, 0, len)) != NULL) {
-               rv--;
-               /* look for a match among the strings provided */
-               for (cstr = 0; strings[cstr] != NULL; cstr++)
-                       if (strcmp(sp, strings[cstr]) == 0)
-                               goto out;
-
-               nsp++;                  /* skip over NUL char */
-               len -= (nsp - sp);
-               sp = nsp;
-       }
-       rv = -1;
-
-out:
-       if (allocated)
-               free(buf, M_TEMP);
-       return (rv);
+ out:
+       kmem_tmpbuf_free(prop, proplen, propbuf);
+       return rv;
 }
 
 /*