From 8c95f41724e6958405880f85228f1ff45920be04 Mon Sep 17 00:00:00 2001 From: Bill Joy Date: Thu, 9 Oct 1980 20:41:08 -0800 Subject: [PATCH] date and time created 80/10/09 12:41:08 by bill SCCS-vsn: bin/csh/csh.h 4.1 --- usr/src/bin/csh/csh.h | 450 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 450 insertions(+) create mode 100644 usr/src/bin/csh/csh.h diff --git a/usr/src/bin/csh/csh.h b/usr/src/bin/csh/csh.h new file mode 100644 index 0000000000..feb4e062f2 --- /dev/null +++ b/usr/src/bin/csh/csh.h @@ -0,0 +1,450 @@ +/* csh.h 4.1 %G% */ + +#include "sh.local.h" +#ifdef VMUNIX +#include +#endif + +/* + * C shell + * + * Bill Joy, UC Berkeley + * October, 1978; May 1980 + * + * Jim Kulp, IIASA, Laxenburg Austria + * April, 1980 + */ +#include +#include +#include + +#define isdir(d) ((d.st_mode & S_IFMT) == S_IFDIR) + +#include +#include +#include +#include + +typedef char bool; + +#define eq(a, b) (strcmp(a, b) == 0) + +/* + * Global flags + */ +bool chkstop; /* Warned of stopped jobs... allow exit */ +bool didcch; /* Have closed unused fd's for child */ +bool didfds; /* Have setup i/o fd's for child */ +bool doneinp; /* EOF indicator after reset from readc */ +bool exiterr; /* Exit if error or non-zero exit status */ +bool child; /* Child shell ... errors cause exit */ +bool haderr; /* Reset was because of an error */ +bool intty; /* Input is a tty */ +bool intact; /* We are interactive... therefore prompt */ +bool justpr; /* Just print because of :p hist mod */ +bool loginsh; /* We are a loginsh -> .login/.logout */ +bool neednote; /* Need to pnotify() */ +bool noexec; /* Don't execute, just syntax check */ +bool pjobs; /* want to print jobs if interrupted */ +bool setintr; /* Set interrupts on/off -> Wait intr... */ +bool timflg; /* Time the next waited for command */ + +/* + * Global i/o info + */ +char *arginp; /* Argument input for sh -c and internal `xx` */ +int onelflg; /* 2 -> need line for -t, 1 -> exit on read */ +char *file; /* Name of shell file for $0 */ + +char *err; /* Error message from scanner/parser */ +int errno; /* Error from C library routines */ +char *shtemp; /* Temp name for << shell files in /tmp */ +time_t time0; /* Time at which the shell started */ + +/* + * Miscellany + */ +char *doldol; /* Character pid for $$ */ +int uid; /* Invokers uid */ +time_t chktim; /* Time mail last checked */ +short shpgrp; /* Pgrp of shell */ +short tpgrp; /* Terminal process group */ +/* If tpgrp is -1, leave tty alone! */ +short opgrp; /* Initial pgrp and tty pgrp */ +int oldisc; /* Initial line discipline or -1 */ +struct tms shtimes; /* shell and child times for process timing */ + +/* + * These are declared here because they want to be + * initialized in sh.init.c (to allow them to be made readonly) + */ + +struct biltins { + char *bname; + int (*bfunct)(); + short minargs, maxargs; +} bfunc[]; + +#define INF 1000 + +struct srch { + char *s_name; + short s_value; +} srchn[]; + +/* + * To be able to redirect i/o for builtins easily, the shell moves the i/o + * descriptors it uses away from 0,1,2. + * Ideally these should be in units which are closed across exec's + * (this saves work) but for version 6, this is not usually possible. + * The desired initial values for these descriptors are defined in + * sh.local.h. + */ +short SHIN; /* Current shell input (script) */ +short SHOUT; /* Shell output */ +short SHDIAG; /* Diagnostic output... shell errs go here */ +short OLDSTD; /* Old standard input (def for cmds) */ + +/* + * Error control + * + * Errors in scanning and parsing set up an error message to be printed + * at the end and complete. Other errors always cause a reset. + * Because of source commands and .cshrc we need nested error catches. + */ + +jmp_buf reslab; + +#define setexit() setjmp(reslab) +#define reset() longjmp(reslab) + /* Should use structure assignment here */ +#define getexit(a) copy((char *)(a), (char *)reslab, sizeof reslab) +#define resexit(a) copy((char *)reslab, ((char *)(a)), sizeof reslab) + +char *gointr; /* Label for an onintr transfer */ +int (*parintr)(); /* Parents interrupt catch */ +int (*parterm)(); /* Parents terminate catch */ + +/* + * Lexical definitions. + * + * All lexical space is allocated dynamically. + * The eighth bit of characters is used to prevent recognition, + * and eventually stripped. + */ +#define QUOTE 0200 /* Eighth char bit used internally for 'ing */ +#define TRIM 0177 /* Mask to strip quote bit */ + +/* + * Each level of input has a buffered input structure. + * There are one or more blocks of buffered input for each level, + * exactly one if the input is seekable and tell is available. + * In other cases, the shell buffers enough blocks to keep all loops + * in the buffer. + */ +struct Bin { + off_t Bfseekp; /* Seek pointer */ + off_t Bfbobp; /* Seekp of beginning of buffers */ + off_t Bfeobp; /* Seekp of end of buffers */ + short Bfblocks; /* Number of buffer blocks */ + char **Bfbuf; /* The array of buffer blocks */ +} B; + +#define fseekp B.Bfseekp +#define fbobp B.Bfbobp +#define feobp B.Bfeobp +#define fblocks B.Bfblocks +#define fbuf B.Bfbuf + +off_t btell(); + +/* + * The shell finds commands in loops by reseeking the input + * For whiles, in particular, it reseeks to the beginning of the + * line the while was on; hence the while placement restrictions. + */ +off_t lineloc; + +#ifdef TELL +off_t tell(); +bool cantell; /* Is current source tellable ? */ +#endif + +/* + * Input lines are parsed into doubly linked circular + * lists of words of the following form. + */ +struct wordent { + char *word; + struct wordent *prev; + struct wordent *next; +}; + +/* + * During word building, both in the initial lexical phase and + * when expanding $ variable substitutions, expansion by `!' and `$' + * must be inhibited when reading ahead in routines which are themselves + * processing `!' and `$' expansion or after characters such as `\' or in + * quotations. The following flags are passed to the getC routines + * telling them which of these substitutions are appropriate for the + * next character to be returned. + */ +#define DODOL 1 +#define DOEXCL 2 +#define DOALL DODOL|DOEXCL + +/* + * Labuf implements a general buffer for lookahead during lexical operations. + * Text which is to be placed in the input stream can be stuck here. + * We stick parsed ahead $ constructs during initial input, + * process id's from `$$', and modified variable values (from qualifiers + * during expansion in sh.dol.c) here. + */ +#ifdef VMUNIX +char labuf[BUFSIZ]; +#else +char labuf[256]; +#endif + +char *lap; + +/* + * Parser structure + * + * Each command is parsed to a tree of command structures and + * flags are set bottom up during this process, to be propagated down + * as needed during the semantics/exeuction pass (sh.sem.c). + */ +struct command { + short t_dtyp; /* Type of node */ + short t_dflg; /* Flags, e.g. FAND|... */ + union { + char *T_dlef; /* Input redirect word */ + struct command *T_dcar; /* Left part of list/pipe */ + } L; + union { + char *T_drit; /* Output redirect word */ + struct command *T_dcdr; /* Right part of list/pipe */ + } R; +#define t_dlef L.T_dlef +#define t_dcar L.T_dcar +#define t_drit R.T_drit +#define t_dcdr R.T_dcdr + char **t_dcom; /* Command/argument vector */ + struct command *t_dspr; /* Pointer to ()'d subtree */ + short t_nice; +}; + +#define TCOM 1 /* t_dcom t_drit */ +#define TPAR 2 /* ( t_dspr ) t_drit */ +#define TFIL 3 /* t_dlef | t_drit */ +#define TLST 4 /* t_dlef ; t_drit */ +#define TOR 5 /* t_dlef || t_drit */ +#define TAND 6 /* t_dlef && t_drit */ + +#define FSAVE (FNICE|FTIME|FNOHUP) /* save these when re-doing */ + +#define FAND (1<<0) /* executes in background */ +#define FCAT (1<<1) /* output is redirected >> */ +#define FPIN (1<<2) /* input is a pipe */ +#define FPOU (1<<3) /* output is a pipe */ +#define FPAR (1<<4) /* don't fork, last ()ized cmd */ +#define FINT (1<<5) /* should be immune from intr's */ +/* spare */ +#define FDIAG (1<<7) /* redirect unit 2 with unit 1 */ +#define FANY (1<<8) /* output was ! */ +#define FHERE (1<<9) /* input redirection is << */ +#define FREDO (1<<10) /* reexec aft if, repeat,... */ +#define FNICE (1<<11) /* t_nice is meaningful */ +#define FNOHUP (1<<12) /* nohup this command */ +#define FTIME (1<<13) /* time this command */ + +/* + * The keywords for the parser + */ +#define ZBREAK 0 +#define ZBRKSW 1 +#define ZCASE 2 +#define ZDEFAULT 3 +#define ZELSE 4 +#define ZEND 5 +#define ZENDIF 6 +#define ZENDSW 7 +#define ZEXIT 8 +#define ZFOREACH 9 +#define ZGOTO 10 +#define ZIF 11 +#define ZLABEL 12 +#define ZLET 13 +#define ZSET 14 +#define ZSWITCH 15 +#define ZTEST 16 +#define ZTHEN 17 +#define ZWHILE 18 + +/* + * Structure defining the existing while/foreach loops at this + * source level. Loops are implemented by seeking back in the + * input. For foreach (fe), the word list is attached here. + */ +struct whyle { + off_t w_start; /* Point to restart loop */ + off_t w_end; /* End of loop (0 if unknown) */ + char **w_fe, **w_fe0; /* Current/initial wordlist for fe */ + char *w_fename; /* Name for fe */ + struct whyle *w_next; /* Next (more outer) loop */ +} *whyles; + +/* + * Variable structure + * + * Lists of aliases and variables are sorted alphabetically by name + */ +struct varent { + char **vec; /* Array of words which is the value */ + char *name; /* Name of variable/alias */ + struct varent *link; +} shvhed, aliases; + +/* + * The following are for interfacing redo substitution in + * aliases to the lexical routines. + */ +struct wordent *alhistp; /* Argument list (first) */ +struct wordent *alhistt; /* Node after last in arg list */ +char **alvec; /* The (remnants of) alias vector */ + +/* + * Filename/command name expansion variables + */ +short gflag; /* After tglob -> is globbing needed? */ + +/* + * A reasonable limit on number of arguments would seem to be + * the maximum number of characters in an arg list / 6. + */ +#define GAVSIZ NCARGS / 6 + +/* + * Variables for filename expansion + */ +char **gargv; /* Pointer to the (stack) arglist */ +short gargc; /* Number args in gargv */ +short gnleft; + +/* + * Variables for command expansion. + */ +char **pargv; /* Pointer to the argv list space */ +char *pargs; /* Pointer to start current word */ +short pargc; /* Count of arguments in pargv */ +short pnleft; /* Number of chars left in pargs */ +char *pargcp; /* Current index into pargs */ + +/* + * History list + * + * Each history list entry contains an embedded wordlist + * from the scanner, a number for the event, and a reference count + * to aid in discarding old entries. + * + * Essentially "invisible" entries are put on the history list + * when history substitution includes modifiers, and thrown away + * at the next discarding since their event numbers are very negative. + */ +struct Hist { + struct wordent Hlex; + int Hnum; + int Href; + struct Hist *Hnext; +} Histlist; + +struct wordent paraml; /* Current lexical word list */ +int eventno; /* Next events number */ +int lastev; /* Last event reference (default) */ + +char HIST; /* history invocation character */ +char HISTSUB; /* auto-substitute character */ + +char *Dfix1(); +struct varent *adrof(), *adrof1(); +char **blkcat(); +char **blkcpy(); +char **blkend(); +char **blkspl(); +char *calloc(); +char *cname(); +char **copyblk(); +char **dobackp(); +char *domod(); +struct wordent *dosub(); +char *exp3(); +char *exp3a(); +char *exp4(); +char *exp5(); +char *exp6(); +struct Hist *enthist(); +struct Hist *findev(); +struct wordent *freenod(); +char *getenv(); +char *getinx(); +struct varent *getvx(); +struct passwd *getpwnam(); +struct wordent *gethent(); +struct wordent *getsub(); +char *getwd(); +char *globone(); +struct biltins *isbfunc(); +char **glob(); +char *operate(); +int pintr(); +int pchild(); +char *putn(); +char **saveblk(); +char *savestr(); +char *strcat(); +char *strcpy(); +char *strend(); +char *strings(); +char *strip(); +char *strspl(); +char *subword(); +struct command *syntax(); +struct command *syn0(); +struct command *syn1(); +struct command *syn1a(); +struct command *syn1b(); +struct command *syn2(); +struct command *syn3(); +int tglob(); +int trim(); +char *value(), *value1(); +char *xhome(); +char *xname(); +char *xset(); + +#define NOSTR ((char *) 0) + +/* + * setname is a macro to save space (see sh.err.c) + */ +char *bname; +#define setname(a) bname = (a); + +#ifdef VFORK +char *Vsav; +char **Vav; +char *Vdp; +#endif + +#ifdef VMUNIX +struct vtimes zvms; +#endif + +char **evalvec; +char *evalp; + +struct mesg { + char *iname; /* name from /usr/include */ + char *pname; /* print name */ +} mesg[]; -- 2.20.1