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Diffstat (limited to 'table.h')
| -rw-r--r-- | table.h | 181 |
1 files changed, 181 insertions, 0 deletions
@@ -0,0 +1,181 @@ +/* $NetBSD: table.h,v 1.4 2018/06/03 12:18:29 kamil Exp $ */ + +/* + * generic hashed associative table for commands and variables. + */ + +struct table { + Area *areap; /* area to allocate entries */ + short size, nfree; /* hash size (always 2^^n), free entries */ + struct tbl **tbls; /* hashed table items */ +}; + +struct tbl { /* table item */ + Tflag flag; /* flags */ + int type; /* command type (see below), base (if INTEGER), + * or offset from val.s of value (if EXPORT) */ + Area *areap; /* area to allocate from */ + union { + char *s; /* string */ + long i; /* integer */ + int (*f) ARGS((char **)); /* int function */ + struct op *t; /* "function" tree */ + } val; /* value */ + int index; /* index for an array */ + union { + int field; /* field with for -L/-R/-Z */ + int errno_; /* CEXEC/CTALIAS */ + } u2; + union { + struct tbl *array; /* array values */ + char *fpath; /* temporary path to undef function */ + } u; + char name[4]; /* name -- variable length */ +}; + +/* common flag bits */ +#define ALLOC BIT(0) /* val.s has been allocated */ +#define DEFINED BIT(1) /* is defined in block */ +#define ISSET BIT(2) /* has value, vp->val.[si] */ +#define EXPORT BIT(3) /* exported variable/function */ +#define TRACE BIT(4) /* var: user flagged, func: execution tracing */ +/* (start non-common flags at 8) */ +/* flag bits used for variables */ +#define SPECIAL BIT(8) /* PATH, IFS, SECONDS, etc */ +#define INTEGER BIT(9) /* val.i contains integer value */ +#define RDONLY BIT(10) /* read-only variable */ +#define LOCAL BIT(11) /* for local typeset() */ +#define ARRAY BIT(13) /* array */ +#define LJUST BIT(14) /* left justify */ +#define RJUST BIT(15) /* right justify */ +#define ZEROFIL BIT(16) /* 0 filled if RJUSTIFY, strip 0s if LJUSTIFY */ +#define LCASEV BIT(17) /* convert to lower case */ +#define UCASEV_AL BIT(18)/* convert to upper case / autoload function */ +#define INT_U BIT(19) /* unsigned integer */ +#define INT_L BIT(20) /* long integer (no-op) */ +#define IMPORT BIT(21) /* flag to typeset(): no arrays, must have = */ +#define LOCAL_COPY BIT(22) /* with LOCAL - copy attrs from existing var */ +#define EXPRINEVAL BIT(23) /* contents currently being evaluated */ +#define EXPRLVALUE BIT(24) /* useable as lvalue (temp flag) */ +/* flag bits used for taliases/builtins/aliases/keywords/functions */ +#define KEEPASN BIT(8) /* keep command assignments (eg, var=x cmd) */ +#define FINUSE BIT(9) /* function being executed */ +#define FDELETE BIT(10) /* function deleted while it was executing */ +#define FKSH BIT(11) /* function defined with function x (vs x()) */ +#define SPEC_BI BIT(12) /* a POSIX special builtin */ +#define REG_BI BIT(13) /* a POSIX regular builtin */ +/* Attributes that can be set by the user (used to decide if an unset param + * should be repoted by set/typeset). Does not include ARRAY or LOCAL. + */ +#define USERATTRIB (EXPORT|INTEGER|RDONLY|LJUST|RJUST|ZEROFIL\ + |LCASEV|UCASEV_AL|INT_U|INT_L) + +/* command types */ +#define CNONE 0 /* undefined */ +#define CSHELL 1 /* built-in */ +#define CFUNC 2 /* function */ +#define CEXEC 4 /* executable command */ +#define CALIAS 5 /* alias */ +#define CKEYWD 6 /* keyword */ +#define CTALIAS 7 /* tracked alias */ + +/* Flags for findcom()/comexec() */ +#define FC_SPECBI BIT(0) /* special builtin */ +#define FC_FUNC BIT(1) /* function builtin */ +#define FC_REGBI BIT(2) /* regular builtin */ +#define FC_UNREGBI BIT(3) /* un-regular builtin (!special,!regular) */ +#define FC_BI (FC_SPECBI|FC_REGBI|FC_UNREGBI) +#define FC_PATH BIT(4) /* do path search */ +#define FC_DEFPATH BIT(5) /* use default path in path search */ + + +#define AF_ARGV_ALLOC 0x1 /* argv[] array allocated */ +#define AF_ARGS_ALLOCED 0x2 /* argument strings allocated */ +#define AI_ARGV(a, i) ((i) == 0 ? (a).argv[0] : (a).argv[(i) - (a).skip]) +#define AI_ARGC(a) ((a).argc_ - (a).skip) + +/* Argument info. Used for $#, $* for shell, functions, includes, etc. */ +struct arg_info { + int flags; /* AF_* */ + char **argv; + int argc_; + int skip; /* first arg is argv[0], second is argv[1 + skip] */ +}; + +/* + * activation record for function blocks + */ +struct block { + Area area; /* area to allocate things */ + /*struct arg_info argi;*/ + char **argv; + int argc; + int flags; /* see BF_* */ + struct table vars; /* local variables */ + struct table funs; /* local functions */ + Getopt getopts_state; +#if 1 + char * error; /* error handler */ + char * exit; /* exit handler */ +#else + Trap error, exit; +#endif + struct block *next; /* enclosing block */ +}; + +/* Values for struct block.flags */ +#define BF_DOGETOPTS BIT(0) /* save/restore getopts state */ + +/* + * Used by ksh_twalk() and tnext() routines. + */ +struct tstate { + int left; + struct tbl **next; +}; + + +EXTERN struct table taliases; /* tracked aliases */ +EXTERN struct table builtins; /* built-in commands */ +EXTERN struct table aliases; /* aliases */ +EXTERN struct table keywords; /* keywords */ +EXTERN struct table homedirs; /* homedir() cache */ + +struct builtin { + const char *name; + int (*func) ARGS((char **)); +}; + +/* these really are externs! Look in table.c for them */ +extern const struct builtin shbuiltins [], kshbuiltins []; + +/* var spec values */ +#define V_NONE 0 +#define V_PATH 1 +#define V_IFS 2 +#define V_SECONDS 3 +#define V_OPTIND 4 +#define V_MAIL 5 +#define V_MAILPATH 6 +#define V_MAILCHECK 7 +#define V_RANDOM 8 +#define V_HISTSIZE 9 +#define V_HISTFILE 10 +#define V_VISUAL 11 +#define V_EDITOR 12 +#define V_COLUMNS 13 +#define V_POSIXLY_CORRECT 14 +#define V_TMOUT 15 +#define V_TMPDIR 16 +#define V_LINENO 17 + +/* values for set_prompt() */ +#define PS1 0 /* command */ +#define PS2 1 /* command continuation */ + +EXTERN char *path; /* copy of either PATH or def_path */ +EXTERN const char *def_path; /* path to use if PATH not set */ +EXTERN char *tmpdir; /* TMPDIR value */ +EXTERN const char *prompt; +EXTERN int cur_prompt; /* PS1 or PS2 */ +EXTERN int current_lineno; /* LINENO value */ |