table.h revision 1.1
1 /* $Id: table.h,v 1.1 1996/09/21 23:35:17 jtc Exp $ */ 2 3 /* 4 * generic hashed associative table for commands and variables. 5 */ 6 7 struct table { 8 Area *areap; /* area to allocate entries */ 9 short size, nfree; /* hash size (always 2^^n), free entries */ 10 struct tbl **tbls; /* hashed table items */ 11 }; 12 13 struct tbl { /* table item */ 14 Tflag flag; /* flags */ 15 int type; /* command type (see below), base (if INTEGER), 16 * or offset from val.s of value (if EXPORT) */ 17 Area *areap; /* area to allocate from */ 18 union { 19 char *s; /* string */ 20 long i; /* integer */ 21 int (*f) ARGS((char **)); /* int function */ 22 struct op *t; /* "function" tree */ 23 } val; /* value */ 24 int index; /* index for an array */ 25 union { 26 int field; /* field with for -L/-R/-Z */ 27 int errno_; /* CEXEC/CTALIAS */ 28 } u2; 29 union { 30 struct tbl *array; /* array values */ 31 char *fpath; /* temporary path to undef function */ 32 } u; 33 char name[4]; /* name -- variable length */ 34 }; 35 36 /* common flag bits */ 37 #define ALLOC BIT(0) /* val.s has been allocated */ 38 #define DEFINED BIT(1) /* is defined in block */ 39 #define ISSET BIT(2) /* has value, vp->val.[si] */ 40 #define EXPORT BIT(3) /* exported variable/function */ 41 #define TRACE BIT(4) /* var: user flagged, func: execution tracing */ 42 /* (start non-common flags at 8) */ 43 /* flag bits used for variables */ 44 #define SPECIAL BIT(8) /* PATH, IFS, SECONDS, etc */ 45 #define INTEGER BIT(9) /* val.i contains integer value */ 46 #define RDONLY BIT(10) /* read-only variable */ 47 #define LOCAL BIT(11) /* for local typeset() */ 48 #define ARRAY BIT(13) /* array */ 49 #define LJUST BIT(14) /* left justify */ 50 #define RJUST BIT(15) /* right justify */ 51 #define ZEROFIL BIT(16) /* 0 filled if RJUSTIFY, strip 0s if LJUSTIFY */ 52 #define LCASEV BIT(17) /* convert to lower case */ 53 #define UCASEV_AL BIT(18)/* convert to upper case / autoload function */ 54 #define INT_U BIT(19) /* unsigned integer */ 55 #define INT_L BIT(20) /* long integer (no-op) */ 56 #define IMPORT BIT(21) /* flag to typeset(): no arrays, must have = */ 57 #define LOCAL_COPY BIT(22) /* with LOCAL - copy attrs from existing var */ 58 #define EXPRINEVAL BIT(23) /* contents currently being evaluated */ 59 #define EXPRLVALUE BIT(24) /* useable as lvalue (temp flag) */ 60 /* flag bits used for taliases/builtins/aliases/keywords/functions */ 61 #define KEEPASN BIT(8) /* keep command assignments (eg, var=x cmd) */ 62 #define FINUSE BIT(9) /* function being executed */ 63 #define FDELETE BIT(10) /* function deleted while it was executing */ 64 #define FKSH BIT(11) /* function defined with function x (vs x()) */ 65 #define SPEC_BI BIT(12) /* a POSIX special builtin */ 66 #define REG_BI BIT(13) /* a POSIX regular builtin */ 67 68 /* command types */ 69 #define CNONE 0 /* undefined */ 70 #define CSHELL 1 /* built-in */ 71 #define CFUNC 2 /* function */ 72 #define CEXEC 4 /* executable command */ 73 #define CALIAS 5 /* alias */ 74 #define CKEYWD 6 /* keyword */ 75 #define CTALIAS 7 /* tracked alias */ 76 77 /* Flags for findcom()/comexec() */ 78 #define FC_SPECBI BIT(0) /* special builtin */ 79 #define FC_FUNC BIT(1) /* function builtin */ 80 #define FC_REGBI BIT(2) /* regular builtin */ 81 #define FC_UNREGBI BIT(3) /* un-regular builtin (!special,!regular) */ 82 #define FC_BI (FC_SPECBI|FC_REGBI|FC_UNREGBI) 83 #define FC_PATH BIT(4) /* do path search */ 84 #define FC_DEFPATH BIT(5) /* use default path in path search */ 85 86 87 #define AF_ARGV_ALLOC 0x1 /* argv[] array allocated */ 88 #define AF_ARGS_ALLOCED 0x2 /* argument strings allocated */ 89 #define AI_ARGV(a, i) ((i) == 0 ? (a).argv[0] : (a).argv[(i) - (a).skip]) 90 #define AI_ARGC(a) ((a).argc_ - (a).skip) 91 92 /* Argument info. Used for $#, $* for shell, functions, includes, etc. */ 93 struct arg_info { 94 int flags; /* AF_* */ 95 char **argv; 96 int argc_; 97 int skip; /* first arg is argv[0], second is argv[1 + skip] */ 98 }; 99 100 /* 101 * activation record for function blocks 102 */ 103 struct block { 104 Area area; /* area to allocate things */ 105 /*struct arg_info argi;*/ 106 char **argv; 107 int argc; 108 struct table vars; /* local variables */ 109 struct table funs; /* local functions */ 110 #if 1 111 char * error; /* error handler */ 112 char * exit; /* exit handler */ 113 #else 114 Trap error, exit; 115 #endif 116 struct block *next; /* enclosing block */ 117 }; 118 119 /* 120 * Used by twalk() and tnext() routines. 121 */ 122 struct tstate { 123 int left; 124 struct tbl **next; 125 }; 126 127 128 EXTERN struct table taliases; /* tracked aliases */ 129 EXTERN struct table builtins; /* built-in commands */ 130 EXTERN struct table aliases; /* aliases */ 131 EXTERN struct table keywords; /* keywords */ 132 EXTERN struct table homedirs; /* homedir() cache */ 133 134 struct builtin { 135 const char *name; 136 int (*func) ARGS((char **)); 137 }; 138 139 /* these really are externs! Look in table.c for them */ 140 extern const struct builtin shbuiltins [], kshbuiltins []; 141 142 /* var spec values */ 143 #define V_NONE 0 144 #define V_PATH 1 145 #define V_IFS 2 146 #define V_SECONDS 3 147 #define V_OPTIND 4 148 #define V_MAIL 5 149 #define V_MAILPATH 6 150 #define V_MAILCHECK 7 151 #define V_RANDOM 8 152 #define V_HISTSIZE 9 153 #define V_HISTFILE 10 154 #define V_VISUAL 11 155 #define V_EDITOR 12 156 #define V_COLUMNS 13 157 #define V_POSIXLY_CORRECT 14 158 #define V_TMOUT 15 159 #define V_TMPDIR 16 160 161 /* values for set_prompt() */ 162 #define PS1 0 /* command */ 163 #define PS2 1 /* command continuation */ 164 165 EXTERN const char *path; /* PATH value */ 166 EXTERN const char *def_path; /* path to use if PATH not set */ 167 EXTERN char *tmpdir; /* TMPDIR value */ 168 EXTERN const char *prompt; 169 EXTERN int cur_prompt; /* PS1 or PS2 */ 170
Indexes created Wed Oct 15 16:09:53 GMT 2025