diff options
Diffstat (limited to 'tree.h')
| -rw-r--r-- | tree.h | 141 |
1 files changed, 141 insertions, 0 deletions
@@ -0,0 +1,141 @@ +/* $NetBSD: tree.h,v 1.7 2017/06/22 14:20:46 kamil Exp $ */ + +/* + * command trees for compile/execute + */ + +/* $Id: tree.h,v 1.7 2017/06/22 14:20:46 kamil Exp $ */ + +#define NOBLOCK ((struct op *)NULL) +#define NOWORD ((char *)NULL) +#define NOWORDS ((char **)NULL) + +/* + * Description of a command or an operation on commands. + */ +struct op { + short type; /* operation type, see below */ + union { /* WARNING: newtp(), tcopy() use evalflags = 0 to clear union */ + short evalflags; /* TCOM: arg expansion eval() flags */ + short ksh_func; /* TFUNC: function x (vs x()) */ + } u; + char **args; /* arguments to a command */ + char **vars; /* variable assignments */ + struct ioword **ioact; /* IO actions (eg, < > >>) */ + struct op *left, *right; /* descendents */ + char *str; /* word for case; identifier for for, + * select, and functions; + * path to execute for TEXEC; + * time hook for TCOM. + */ + int lineno; /* TCOM/TFUNC: LINENO for this */ +}; + +/* Tree.type values */ +#define TEOF 0 +#define TCOM 1 /* command */ +#define TPAREN 2 /* (c-list) */ +#define TPIPE 3 /* a | b */ +#define TLIST 4 /* a ; b */ +#define TOR 5 /* || */ +#define TAND 6 /* && */ +#define TBANG 7 /* ! */ +#define TDBRACKET 8 /* [[ .. ]] */ +#define TFOR 9 +#define TSELECT 10 +#define TCASE 11 +#define TIF 12 +#define TWHILE 13 +#define TUNTIL 14 +#define TELIF 15 +#define TPAT 16 /* pattern in case */ +#define TBRACE 17 /* {c-list} */ +#define TASYNC 18 /* c & */ +#define TFUNCT 19 /* function name { command; } */ +#define TTIME 20 /* time pipeline */ +#define TEXEC 21 /* fork/exec eval'd TCOM */ +#define TCOPROC 22 /* coprocess |& */ + +/* + * prefix codes for words in command tree + */ +#define EOS 0 /* end of string */ +#define CHAR 1 /* unquoted character */ +#define QCHAR 2 /* quoted character */ +#define COMSUB 3 /* $() substitution (0 terminated) */ +#define EXPRSUB 4 /* $(()) substitution (0 terminated) */ +#define OQUOTE 5 /* opening " or ' */ +#define CQUOTE 6 /* closing " or ' */ +#define OSUBST 7 /* opening ${ subst (followed by { or X) */ +#define CSUBST 8 /* closing } of above (followed by } or X) */ +#define OPAT 9 /* open pattern: *(, @(, etc. */ +#define SPAT 10 /* separate pattern: | */ +#define CPAT 11 /* close pattern: ) */ + +/* + * IO redirection + */ +struct ioword { + int unit; /* unit affected */ + int flag; /* action (below) */ + char *name; /* file name (unused if heredoc) */ + char *delim; /* delimiter for <<,<<- */ + char *heredoc;/* content of heredoc */ +}; + +/* ioword.flag - type of redirection */ +#define IOTYPE 0xF /* type: bits 0:3 */ +#define IOREAD 0x1 /* < */ +#define IOWRITE 0x2 /* > */ +#define IORDWR 0x3 /* <>: todo */ +#define IOHERE 0x4 /* << (here file) */ +#define IOCAT 0x5 /* >> */ +#define IODUP 0x6 /* <&/>& */ +#define IOEVAL BIT(4) /* expand in << */ +#define IOSKIP BIT(5) /* <<-, skip ^\t* */ +#define IOCLOB BIT(6) /* >|, override -o noclobber */ +#define IORDUP BIT(7) /* x<&y (as opposed to x>&y) */ +#define IONAMEXP BIT(8) /* name has been expanded */ + +/* execute/exchild flags */ +#define XEXEC BIT(0) /* execute without forking */ +#define XFORK BIT(1) /* fork before executing */ +#define XBGND BIT(2) /* command & */ +#define XPIPEI BIT(3) /* input is pipe */ +#define XPIPEO BIT(4) /* output is pipe */ +#define XPIPE (XPIPEI|XPIPEO) /* member of pipe */ +#define XXCOM BIT(5) /* `...` command */ +#define XPCLOSE BIT(6) /* exchild: close close_fd in parent */ +#define XCCLOSE BIT(7) /* exchild: close close_fd in child */ +#define XERROK BIT(8) /* non-zero exit ok (for set -e) */ +#define XCOPROC BIT(9) /* starting a co-process */ +#define XTIME BIT(10) /* timing TCOM command */ + +/* + * flags to control expansion of words (assumed by t->evalflags to fit + * in a short) + */ +#define DOBLANK BIT(0) /* perform blank interpretation */ +#define DOGLOB BIT(1) /* expand [?* */ +#define DOPAT BIT(2) /* quote *?[ */ +#define DOTILDE BIT(3) /* normal ~ expansion (first char) */ +#define DONTRUNCOMMAND BIT(4) /* do not run $(command) things */ +#define DOASNTILDE BIT(5) /* assignment ~ expansion (after =, :) */ +#define DOBRACE_ BIT(6) /* used by expand(): do brace expansion */ +#define DOMAGIC_ BIT(7) /* used by expand(): string contains MAGIC */ +#define DOTEMP_ BIT(8) /* ditto : in word part of ${..[%#=?]..} */ +#define DOVACHECK BIT(9) /* var assign check (for typeset, set, etc) */ +#define DOMARKDIRS BIT(10) /* force markdirs behaviour */ + +/* + * The arguments of [[ .. ]] expressions are kept in t->args[] and flags + * indicating how the arguments have been munged are kept in t->vars[]. + * The contents of t->vars[] are stuffed strings (so they can be treated + * like all other t->vars[]) in which the second character is the one that + * is examined. The DB_* defines are the values for these second characters. + */ +#define DB_NORM 1 /* normal argument */ +#define DB_OR 2 /* || -> -o conversion */ +#define DB_AND 3 /* && -> -a conversion */ +#define DB_BE 4 /* an inserted -BE */ +#define DB_PAT 5 /* a pattern argument */ |