Implement support for personal units library.

With -f one could read an alternative library but it would replace the
standard units library, not add to it. Allow passing -f multiple times
to read all files and merge them together. Passing the empty string,
i.e. -f '' reads the default units library.

This is implemented in at least FreeBSD and Linux.

OK miod

Change all tame callers to namechange to pledge(2).

tame "stdio rpath" before opening the file, tame "stdio" after that

unsigned char for ctype
ok okan

Include unistd.h as it is the standard location for getopt().

OK millert@

an undocumented feature of units was the ability to specify a prefix
in non-interactive mode. document that now, but also allow for the
prefix to be given without a need to quote it;

code lifted from atatat (netbsd -r1.10); otto helped me paste it in.

ok otto millert

do not search PATH for a units datafile; from pjanzen

just define UNITSFILE directly, and do away with the need for pathnames.h;
ok deraadt

from pjanzen:
Bump MAXPREFIXES (and a few string lengths) prior to units.lib
commit of more prefixes. Add FreeBSD fixes (circa 2001) to prefix
and other units.lib parsing. Do minor obvious code tidying.

sync usage(); from Igor Sobrado

- Don't access buffers with negative indexes.
- Save a ton of strlen calls.
- Return NULL pointer, not 0.

``boy there is a lot of strlen()'' millert@ and OK moritz@.

Change hard coded numbers to sizeof(buf). Also change some
sizeof(buf) - 1 to sizeof(buf), since fgets takes the whole buffer size.

Based on diff from Charles Longeau <chl at tuxfamily dot org> long ago.

OK millert@.

* fix the duplicate prefix and duplicate unit parsing

with suggestion & ok millert

* plug memory leaks in the file parser and in the interactive mode parser

ok otto

cleanup

mostly ansi cleanup; pval ok

use more strlcpy()

typo

- replace some strn?cpy/strn?cat pairs w/ snprintf
- strcpy() -> strncpy()

two fixes from freebsd plus some more by me

rcsid

sync to netbsd 960418

branches: 1.1.1;
Initial revision

Change all tame callers to namechange to pledge(2).

tame "stdio rpath" before opening the file, tame "stdio" after that

unsigned char for ctype
ok okan

Include unistd.h as it is the standard location for getopt().

OK millert@

an undocumented feature of units was the ability to specify a prefix
in non-interactive mode. document that now, but also allow for the
prefix to be given without a need to quote it;

code lifted from atatat (netbsd -r1.10); otto helped me paste it in.

ok otto millert

do not search PATH for a units datafile; from pjanzen

just define UNITSFILE directly, and do away with the need for pathnames.h;
ok deraadt

from pjanzen:
Bump MAXPREFIXES (and a few string lengths) prior to units.lib
commit of more prefixes. Add FreeBSD fixes (circa 2001) to prefix
and other units.lib parsing. Do minor obvious code tidying.

sync usage(); from Igor Sobrado

- Don't access buffers with negative indexes.
- Save a ton of strlen calls.
- Return NULL pointer, not 0.

``boy there is a lot of strlen()'' millert@ and OK moritz@.

Change hard coded numbers to sizeof(buf). Also change some
sizeof(buf) - 1 to sizeof(buf), since fgets takes the whole buffer size.

Based on diff from Charles Longeau <chl at tuxfamily dot org> long ago.

OK millert@.

* fix the duplicate prefix and duplicate unit parsing

with suggestion & ok millert

* plug memory leaks in the file parser and in the interactive mode parser

ok otto

cleanup

mostly ansi cleanup; pval ok

use more strlcpy()

typo

- replace some strn?cpy/strn?cat pairs w/ snprintf
- strcpy() -> strncpy()

two fixes from freebsd plus some more by me

rcsid

sync to netbsd 960418

branches: 1.1.1;
Initial revision