1 /* 2 * command trees for compile/execute 3 */ 4 5 /* $Id: tree.h,v 1.3 1994/05/31 13:34:34 michael Exp $ */ 6 7 #define NOBLOCK ((struct op *)NULL) 8 #define NOWORD ((char *)NULL) 9 #define NOWORDS ((char **)NULL) 10 11 /* 12 * Description of a command or an operation on commands. 13 */ 14 struct op { 15 short type; /* operation type, see below */ 16 union { /* WARNING: newtp(), tcopy() use evalflags = 0 to clear union */ 17 short evalflags; /* TCOM: arg expansion eval() flags */ 18 short ksh_func; /* TFUNC: function x (vs x()) */ 19 } u; 20 char **args; /* arguments to a command */ 21 char **vars; /* variable assignments */ 22 struct ioword **ioact; /* IO actions (eg, < > >>) */ 23 struct op *left, *right; /* descendents */ 24 char *str; /* word for case; identifier for for, 25 * select, and functions; 26 * path to execute for TEXEC; 27 * time hook for TCOM. 28 */ 29 int lineno; /* TCOM/TFUNC: LINENO for this */ 30 }; 31 32 /* Tree.type values */ 33 #define TEOF 0 34 #define TCOM 1 /* command */ 35 #define TPAREN 2 /* (c-list) */ 36 #define TPIPE 3 /* a | b */ 37 #define TLIST 4 /* a ; b */ 38 #define TOR 5 /* || */ 39 #define TAND 6 /* && */ 40 #define TBANG 7 /* ! */ 41 #define TDBRACKET 8 /* [[ .. ]] */ 42 #define TFOR 9 43 #define TSELECT 10 44 #define TCASE 11 45 #define TIF 12 46 #define TWHILE 13 47 #define TUNTIL 14 48 #define TELIF 15 49 #define TPAT 16 /* pattern in case */ 50 #define TBRACE 17 /* {c-list} */ 51 #define TASYNC 18 /* c & */ 52 #define TFUNCT 19 /* function name { command; } */ 53 #define TTIME 20 /* time pipeline */ 54 #define TEXEC 21 /* fork/exec eval'd TCOM */ 55 #define TCOPROC 22 /* coprocess |& */ 56 57 /* 58 * prefix codes for words in command tree 59 */ 60 #define EOS 0 /* end of string */ 61 #define CHAR 1 /* unquoted character */ 62 #define QCHAR 2 /* quoted character */ 63 #define COMSUB 3 /* $() substitution (0 terminated) */ 64 #define EXPRSUB 4 /* $(()) substitution (0 terminated) */ 65 #define OQUOTE 5 /* opening " or ' */ 66 #define CQUOTE 6 /* closing " or ' */ 67 #define OSUBST 7 /* opening ${ subst (followed by { or X) */ 68 #define CSUBST 8 /* closing } of above (followed by } or X) */ 69 #define OPAT 9 /* open pattern: *(, @(, etc. */ 70 #define SPAT 10 /* separate pattern: | */ 71 #define CPAT 11 /* close pattern: ) */ 72 73 /* 74 * IO redirection 75 */ 76 struct ioword { 77 int unit; /* unit affected */ 78 int flag; /* action (below) */ 79 char *name; /* file name (unused if heredoc) */ 80 char *delim; /* delimiter for <<,<<- */ 81 char *heredoc;/* content of heredoc */ 82 }; 83 84 /* ioword.flag - type of redirection */ 85 #define IOTYPE 0xF /* type: bits 0:3 */ 86 #define IOREAD 0x1 /* < */ 87 #define IOWRITE 0x2 /* > */ 88 #define IORDWR 0x3 /* <>: todo */ 89 #define IOHERE 0x4 /* << (here file) */ 90 #define IOCAT 0x5 /* >> */ 91 #define IODUP 0x6 /* <&/>& */ 92 #define IOEVAL BIT(4) /* expand in << */ 93 #define IOSKIP BIT(5) /* <<-, skip ^\t* */ 94 #define IOCLOB BIT(6) /* >|, override -o noclobber */ 95 #define IORDUP BIT(7) /* x<&y (as opposed to x>&y) */ 96 #define IONAMEXP BIT(8) /* name has been expanded */ 97 98 /* execute/exchild flags */ 99 #define XEXEC BIT(0) /* execute without forking */ 100 #define XFORK BIT(1) /* fork before executing */ 101 #define XBGND BIT(2) /* command & */ 102 #define XPIPEI BIT(3) /* input is pipe */ 103 #define XPIPEO BIT(4) /* output is pipe */ 104 #define XPIPE (XPIPEI|XPIPEO) /* member of pipe */ 105 #define XXCOM BIT(5) /* `...` command */ 106 #define XPCLOSE BIT(6) /* exchild: close close_fd in parent */ 107 #define XCCLOSE BIT(7) /* exchild: close close_fd in child */ 108 #define XERROK BIT(8) /* non-zero exit ok (for set -e) */ 109 #define XCOPROC BIT(9) /* starting a co-process */ 110 #define XTIME BIT(10) /* timeing TCOM command */ 111 #define XINTACT BIT(11) /* OS2: proc started from interactive session */ 112 113 /* 114 * flags to control expansion of words (assumed by t->evalflags to fit 115 * in a short) 116 */ 117 #define DOBLANK BIT(0) /* perform blank interpretation */ 118 #define DOGLOB BIT(1) /* expand [?* */ 119 #define DOPAT BIT(2) /* quote *?[ */ 120 #define DOTILDE BIT(3) /* normal ~ expansion (first char) */ 121 #define DONTRUNCOMMAND BIT(4) /* do not run $(command) things */ 122 #define DOASNTILDE BIT(5) /* assignment ~ expansion (after =, :) */ 123 #define DOBRACE_ BIT(6) /* used by expand(): do brace expansion */ 124 #define DOMAGIC_ BIT(7) /* used by expand(): string contains MAGIC */ 125 #define DOTEMP_ BIT(8) /* ditto : in word part of ${..[%#=?]..} */ 126 #define DOVACHECK BIT(9) /* var assign check (for typeset, set, etc) */ 127 #define DOMARKDIRS BIT(10) /* force markdirs behaviour */ 128 129 /* 130 * The arguments of [[ .. ]] expressions are kept in t->args[] and flags 131 * indicating how the arguments have been munged are kept in t->vars[]. 132 * The contents of t->vars[] are stuffed strings (so they can be treated 133 * like all other t->vars[]) in which the second character is the one that 134 * is examined. The DB_* defines are the values for these second characters. 135 */ 136 #define DB_NORM 1 /* normal argument */ 137 #define DB_OR 2 /* || -> -o conversion */ 138 #define DB_AND 3 /* && -> -a conversion */ 139 #define DB_BE 4 /* an inserted -BE */ 140 #define DB_PAT 5 /* a pattern argument */ 141