Simon Poole reports that awk segfaults when environment variables

with no value exist, i.e.

	$ export BOB=''
	% ./busybox awk
	Segmentation fault

This patch teaches awk to not blow chunks on empty env variables.
 -Erik

1 files changed, 4 insertions, 0 deletions

diff --git a/editors/awk.c b/editors/awk.c
index af8958925..c0e1a71fe 100644
--- a/editors/awk.c
+++ b/editors/awk.c
@@ -2670,8 +2670,12 @@ extern int awk_main(int argc, char **argv) {
         for (envp=environ; *envp; envp++) {
                 s = bb_xstrdup(*envp);
                 s1 = strchr(s, '=');
+                if (!s1) {
+                        goto keep_going;
+                }
                 *(s1++) = '\0';
                 setvar_u(findvar(iamarray(V[ENVIRON]), s), s1);
+keep_going:
                 free(s);
         }