provide a workaround for missing strnlen #25

[mojca]

The strnlen function is only defined in POSIX.1-2008. It is missing on Solaris 10 or Mac OS X 10.6 for example.

[gdraheim]

I have read up about and it seems to be supported even on Windows (atleast back to MSVC6). There are hints that malloc(3) might be defined in but commentators do point out that it is a non-standard location with a possibly non-standard declaration.

I'll not roll a release by tomorrow - but the patch looks great with a real autoconf check being added. All further enhancement should be based on it. Thanks a lot!

[mojca]

Thanks for the quick patch.

To criticise my own patch, here's a bunch of warnings (along with a few unrelated ones)

../../zziplib/zzip/__string.h: In function `_zzip_strnlen':
../../zziplib/zzip/__string.h:26: warning: signed and unsigned type in conditional expression
../../zziplib/zzip/__string.h: In function `_zzip_strndup':
../../zziplib/zzip/__string.h:41: warning: return discards qualifiers from pointer target type

../../zziplib/zzip/mmapped.c: In function `zzip_disk_findfirst':
../../zziplib/zzip/mmapped.c:447: warning: ISO C90 forbids mixed declarations and code

../../zziplib/zzip/memdisk.c: In function `zzip_mem_disk_fdopen':
../../zziplib/zzip/memdisk.c:112: warning: format argument is not a pointer (arg 4)
../../zziplib/zzip/memdisk.c: In function `zzip_mem_entry_new':
../../zziplib/zzip/memdisk.c:240: warning: comparison of distinct pointer types lacks a cast
../../zziplib/zzip/memdisk.c:254: warning: comparison of distinct pointer types lacks a cast
../../zziplib/zzip/memdisk.c: In function `zzip_mem_entry_find_extra_block':
../../zziplib/zzip/memdisk.c:330: warning: comparison between signed and unsigned

../../zziplib/bins/unzzipcat-big.c: In function `unzzip_cat':
../../zziplib/bins/unzzipcat-big.c:109: warning: passing arg 2 of `create_fopen' discards qualifiers from pointer target type
../../zziplib/bins/unzzipcat-big.c:142: warning: passing arg 2 of `create_fopen' discards qualifiers from pointer target type

../../zziplib/bins/unzzipcat-zip.c:127: warning: passing arg 2 of `create_fopen' discards qualifiers from pointer target type
../../zziplib/bins/unzzipcat-zip.c:149: warning: passing arg 2 of `create_fopen' discards qualifiers from pointer target type

../../zziplib/bins/unzzipcat-mix.c: In function `unzzip_cat':
../../zziplib/bins/unzzipcat-mix.c:127: warning: passing arg 2 of `create_fopen' discards qualifiers from pointer target type
../../zziplib/bins/unzzipcat-mix.c:158: warning: passing arg 2 of `create_fopen' discards qualifiers from pointer target type

../../zziplib/bins/unzzipcat-mem.c:117: warning: passing arg 2 of `create_fopen' discards qualifiers from pointer target type
../../zziplib/bins/unzzipcat-mem.c:149: warning: passing arg 2 of `create_fopen' discards qualifiers from pointer target type
../../zziplib/bins/unzzipcat-mem.c:92: warning: 'done' might be used uninitialized in this function

../../zziplib/bins/unzzip.c: In function `main':
../../zziplib/bins/unzzip.c:38: warning: unused variable `argn'
../../zziplib/bins/unzzip.c:39: warning: unused variable `exitcode'
../../zziplib/bins/unzzip.c:40: warning: unused variable `error'

../../zziplib/bins/zzip.c: In function `main':
../../zziplib/bins/zzip.c:32: warning: unused variable `argn'
../../zziplib/bins/zzip.c:33: warning: unused variable `exitcode'
../../zziplib/bins/zzip.c:34: warning: unused variable `dir'

cp ../../zziplib/docs/zziplib-manpages.tar manpages.tar
cp: cannot access ../../zziplib/docs/zziplib-manpages.tar
*** Error code 2