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String Parameters

String capabilities sometimes require parameters. Normally this just involves replacing the parameter with a supplied variable; however, there are cases where the variable needs to be manipulated or used in conditional expressions. A stack is also provided for simple pop and push operations.

The below % encodings have the following meanings:

%%

outputs %

%[[:]flags][width[.precision]][doxXs]

flags are “[-+#]”. Prefix with ‘:’ to avoid interpreting “%-” as an operator.

%c

pop a parameter and print the character representation of it.

%s

pop a parameter and print the string representation of it.

%p[1-9]

push the parameter [1-9].

%P[a-z]

pop a parameter and push it to dynamic variable [a-z].

%g[a-z]

push the dynamic variable [a-z].

%P[A-Z]

pop a parameter and push it to static variable [a-z].

%g[A-Z]

push the static variable [a-z].

Static variables persist over tparm() whereas dynamic variables do not.

%'c'

char constant c.

%{nn}

integer constant nn.

%l

push the string length of the previously popped parameter.

%+ %- %* %/ %m

arithmetic: pop two parameters and push the result.

%& %| %^

bit operations: pop two parameters and push the result.

%! %~

unary operations: pop two parameters and push the result.

%i

add 1 to parameters 1 and 2.

%? expr %t then %e else %;

If expr equates to zero then control passes to the optional else part.

Boolean Capabilities

Numeric Capabilities

String Capabilities

A Sample Entry

vt100|dec vt100 (w/advanced video),
am, xenl, msgr, mc5i, xon,
cols#80, it#8, lines#24, vt#3,
acsc=``aaffggjjkkllmmnnooppqqrrssttuuvvwwxxyyzz{{||}}~~, bel=^G,
cr=^M, csr=\E[%i%p1%d;%p2%dr, tbc=\E[3g, clear=\E[H\E[J$<50>,
el1=\E[1K$<3>, el=\E[K$<3>, ed=\E[J$<50>,
cup=\E[%i%p1%d;%p2%dH$<5>, cud1=^J, home=\E[H, cub1=^H,
cuf1=\E[C$<2>, cuu1=\E[A$<2>, enacs=\E(B\E)0, smacs=^N,
smam=\E[?7h, blink=\E[5m$<2>, bold=\E[1m$<2>, rev=\E[7m$<2>,
smso=\E[7m$<2>, smul=\E[4m$<2>, rmacs=^O, rmam=\E[?7l,
sgr0=\E[m017$<2>, rmso=\E[m$<2>, rmul=\E[m$<2>, ka1=\EOq,
ka3=\EOs, kb2=\EOr, kbs=^H, kc1=\EOp, kc3=\EOn, kcud1=\EOB,
kent=\EOM, kf0=\EOy, kf1=\EOP, kf2=\EOQ, kf3=\EOR, kf4=\EOS,
kf5=\EOt, kf6=\EOu, kf7=\EOv, kf8=\EOl, kf9=\EOw, kf10=\EOx,
kcub1=\EOD, kcuf1=\EOC, kcuu1=\EOA, rmkx=\E[?1l\E>,
smkx=\E[?1h\E=, lf1=pf1, lf2=pf2, lf3=pf3, lf4=pf4,
cud=\E[%p1%dB, cub=\E[%p1%dD, cuf=\E[%p1%dC, cuu=\E[%p1%dA,
mc0=\E[0i, mc4=\E[4i, mc5=\E[5i,
rs2=\E>\E[?3l\E[?4l\E[?5l\E[?7h\E[?8h, rc=\E8, sc=\E7,
ind=^J, ri=\EM$<5>,
sgr=\E[0%?%p1%p6%|%t;1%;%?%p2%t;4%;%?%p1%p3%|%t;7%;%?%p4%t;5%;m%?%p9%t016%e017%;$<2>,
hts=\EH, ht=^I,

Fetching Compiled Descriptions

This implementation uses hashed databases managed by cdb(5) instead of directories. To maintain compatibility with other implementations, .cdb is appended to each file checked.

If the environment variable TERMINFO is available, does not begin with (‘/’), can be compiled with the above rules and whose name matches TERM then it is used.

If the environment variable TERMCAP is available and does not begin with a slash (‘/’) then it will be translated into terminfo and compiled as above. If its name matches TERM then it is used.

If the environment variable TERMINFO is available and begins with a slash (‘/’) then only this file is searched. Otherwise terminfo will first look for $HOME/.terminfo, followed by /usr/share/misc/terminfo unless TERMINFO_DIRS is available. If a matching description is not found then a small embedded database is searched, which currently holds descriptions for ansi, dumb, vt100, vt220, wsvt25, and xterm.