Fix xargs to obey POSIX's ARG_MAX restrictions.

This avoids "xargs: exec echo: Argument list too long" errors in practice.

find(1) needs to be fixed too, but that's a bit more complicated and a working
xargs provides a workaround.

Bug: http://b/65818597
Test: find /proc | strace -f -e execve ./toybox xargs echo > /dev/null

1 files changed, 1 insertions, 0 deletions

diff --git a/lib/lib.h b/lib/lib.h
index a9a92fd9..889430bd 100644
--- a/lib/lib.h
+++ b/lib/lib.h
@@ -241,6 +241,7 @@ int regexec0(regex_t *preg, char *string, long len, int nmatch,
 char *getusername(uid_t uid);
 char *getgroupname(gid_t gid);
 void do_lines(int fd, void (*call)(char **pline, long len));
+long environ_bytes();
 
 #define HR_SPACE 1 // Space between number and units
 #define HR_B     2 // Use "B" for single byte units