gc: avoid fixed length buffer cleanbuf

R=rsc
CC=golang-dev
https://golang.org/cl/302042

diff --git a/src/cmd/gc/lex.c b/src/cmd/gc/lex.c
index ccde1c4dac9bc1b1d30f5fdd3c57946ed7f0a80b..c3a430665bbd612555cd6bfc51acd7d9e6297456 100644 (file)
--- a/src/cmd/gc/lex.c
+++ b/src/cmd/gc/lex.c
@@ -290,7 +290,7 @@ importfile(Val *f, int line)
        int32 c;
        int len;
        Strlit *path;
-       char cleanbuf[1024];
+       char *cleanbuf;
 
        // TODO(rsc): don't bother reloading imports more than once?
 
@@ -310,7 +310,8 @@ importfile(Val *f, int line)
 
        path = f->u.sval;
        if(islocalname(path)) {
-               snprint(cleanbuf, sizeof cleanbuf, "%s/%s", pathname, path->s);
+               cleanbuf = mal(strlen(pathname) + strlen(path->s) + 2);
+               sprint(cleanbuf, "%s/%s", pathname, path->s);
                cleanname(cleanbuf);
                path = strlit(cleanbuf);
        }