383 lines
10 KiB
C
Executable file
383 lines
10 KiB
C
Executable file
#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <fcntl.h>
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/* Need a way to have void used for ANSI, nothing for K&R. */
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#ifndef _ANSI
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#undef _VOID
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#define _VOID
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#endif
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/* -------- sh.h -------- */
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/*
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* shell
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*/
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#define LINELIM 4096
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#define NPUSH 8 /* limit to input nesting */
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#define NOFILE 20 /* Number of open files */
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#define NUFILE 10 /* Number of user-accessible files */
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#define FDBASE 10 /* First file usable by Shell */
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/*
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* values returned by wait
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*/
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#define WAITSIG(s) ((s)&0177)
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#define WAITVAL(s) (((s)>>8)&0377)
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#define WAITCORE(s) (((s)&0200)!=0)
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/*
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* library and system defintions
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*/
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#ifdef __STDC__
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typedef void xint; /* base type of jmp_buf, for not broken compilers */
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#else
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typedef char * xint; /* base type of jmp_buf, for broken compilers */
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#endif
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/*
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* shell components
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*/
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/* #include "area.h" */
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/* #include "word.h" */
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/* #include "io.h" */
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/* #include "var.h" */
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#define QUOTE 0200
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#define NOBLOCK ((struct op *)NULL)
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#define NOWORD ((char *)NULL)
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#define NOWORDS ((char **)NULL)
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#define NOPIPE ((int *)NULL)
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/*
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* Description of a command or an operation on commands.
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* Might eventually use a union.
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*/
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struct op {
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int type; /* operation type, see below */
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char **words; /* arguments to a command */
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struct ioword **ioact; /* IO actions (eg, < > >>) */
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struct op *left;
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struct op *right;
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char *str; /* identifier for case and for */
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};
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#define TCOM 1 /* command */
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#define TPAREN 2 /* (c-list) */
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#define TPIPE 3 /* a | b */
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#define TLIST 4 /* a [&;] b */
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#define TOR 5 /* || */
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#define TAND 6 /* && */
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#define TFOR 7
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#define TDO 8
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#define TCASE 9
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#define TIF 10
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#define TWHILE 11
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#define TUNTIL 12
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#define TELIF 13
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#define TPAT 14 /* pattern in case */
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#define TBRACE 15 /* {c-list} */
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#define TASYNC 16 /* c & */
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/*
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* actions determining the environment of a process
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*/
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#define BIT(i) (1<<(i))
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#define FEXEC BIT(0) /* execute without forking */
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/*
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* flags to control evaluation of words
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*/
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#define DOSUB 1 /* interpret $, `, and quotes */
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#define DOBLANK 2 /* perform blank interpretation */
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#define DOGLOB 4 /* interpret [?* */
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#define DOKEY 8 /* move words with `=' to 2nd arg. list */
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#define DOTRIM 16 /* trim resulting string */
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#define DOALL (DOSUB|DOBLANK|DOGLOB|DOKEY|DOTRIM)
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Extern char **dolv;
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Extern int dolc;
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Extern int exstat;
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Extern char gflg;
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Extern int talking; /* interactive (talking-type wireless) */
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Extern int execflg;
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Extern int multiline; /* \n changed to ; */
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Extern struct op *outtree; /* result from parser */
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Extern xint *failpt;
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Extern xint *errpt;
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struct brkcon {
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jmp_buf brkpt;
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struct brkcon *nextlev;
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} ;
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Extern struct brkcon *brklist;
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Extern int isbreak;
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/*
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* redirection
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*/
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struct ioword {
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short io_unit; /* unit affected */
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short io_flag; /* action (below) */
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char *io_name; /* file name */
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};
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#define IOREAD 1 /* < */
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#define IOHERE 2 /* << (here file) */
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#define IOWRITE 4 /* > */
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#define IOCAT 8 /* >> */
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#define IOXHERE 16 /* ${}, ` in << */
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#define IODUP 32 /* >&digit */
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#define IOCLOSE 64 /* >&- */
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#define IODEFAULT (-1) /* token for default IO unit */
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Extern struct wdblock *wdlist;
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Extern struct wdblock *iolist;
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/*
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* parsing & execution environment
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*/
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extern struct env {
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char *linep;
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struct io *iobase;
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struct io *iop;
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xint *errpt;
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int iofd;
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struct env *oenv;
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} e;
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/*
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* flags:
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* -e: quit on error
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* -k: look for name=value everywhere on command line
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* -n: no execution
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* -t: exit after reading and executing one command
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* -v: echo as read
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* -x: trace
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* -u: unset variables net diagnostic
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*/
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extern char *flag;
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extern char *null; /* null value for variable */
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extern int intr; /* interrupt pending */
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Extern char *trap[_NSIG+1];
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Extern char ourtrap[_NSIG+1];
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Extern int trapset; /* trap pending */
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extern int heedint; /* heed interrupt signals */
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Extern int yynerrs; /* yacc */
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Extern char line[LINELIM];
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extern char *elinep;
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/*
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* other functions
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*/
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#ifdef __STDC__
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int (*inbuilt(char *s ))(void);
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#else
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int (*inbuilt())();
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#endif
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_PROTOTYPE(char *rexecve , (char *c , char **v , char **envp ));
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_PROTOTYPE(char *space , (int n ));
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_PROTOTYPE(char *strsave , (char *s , int a ));
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_PROTOTYPE(char *evalstr , (char *cp , int f ));
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_PROTOTYPE(char *putn , (int n ));
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_PROTOTYPE(char *itoa , (unsigned u , int n ));
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_PROTOTYPE(char *unquote , (char *as ));
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_PROTOTYPE(struct var *lookup , (char *n ));
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_PROTOTYPE(int rlookup , (char *n ));
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_PROTOTYPE(struct wdblock *glob , (char *cp , struct wdblock *wb ));
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_PROTOTYPE(int subgetc , (int ec , int quoted ));
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_PROTOTYPE(char **makenv , (void));
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_PROTOTYPE(char **eval , (char **ap , int f ));
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_PROTOTYPE(int setstatus , (int s ));
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_PROTOTYPE(int waitfor , (int lastpid , int canintr ));
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_PROTOTYPE(void onintr , (int s )); /* SIGINT handler */
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_PROTOTYPE(int newenv , (int f ));
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_PROTOTYPE(void quitenv , (void));
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_PROTOTYPE(void err , (char *s ));
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_PROTOTYPE(int anys , (char *s1 , char *s2 ));
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_PROTOTYPE(int any , (int c , char *s ));
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_PROTOTYPE(void next , (int f ));
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_PROTOTYPE(void setdash , (void));
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_PROTOTYPE(void onecommand , (void));
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_PROTOTYPE(void runtrap , (int i ));
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_PROTOTYPE(void xfree , (char *s ));
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_PROTOTYPE(int letter , (int c ));
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_PROTOTYPE(int digit , (int c ));
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_PROTOTYPE(int letnum , (int c ));
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_PROTOTYPE(int gmatch , (char *s , char *p ));
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/*
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* error handling
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*/
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_PROTOTYPE(void leave , (void)); /* abort shell (or fail in subshell) */
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_PROTOTYPE(void fail , (void)); /* fail but return to process next command */
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_PROTOTYPE(void warn , (char *s ));
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_PROTOTYPE(void sig , (int i )); /* default signal handler */
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/* -------- var.h -------- */
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struct var {
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char *value;
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char *name;
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struct var *next;
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char status;
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};
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#define COPYV 1 /* flag to setval, suggesting copy */
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#define RONLY 01 /* variable is read-only */
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#define EXPORT 02 /* variable is to be exported */
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#define GETCELL 04 /* name & value space was got with getcell */
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Extern struct var *vlist; /* dictionary */
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Extern struct var *homedir; /* home directory */
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Extern struct var *prompt; /* main prompt */
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Extern struct var *cprompt; /* continuation prompt */
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Extern struct var *path; /* search path for commands */
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Extern struct var *shell; /* shell to interpret command files */
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Extern struct var *ifs; /* field separators */
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_PROTOTYPE(int yyparse , (void));
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_PROTOTYPE(struct var *lookup , (char *n ));
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_PROTOTYPE(void setval , (struct var *vp , char *val ));
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_PROTOTYPE(void nameval , (struct var *vp , char *val , char *name ));
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_PROTOTYPE(void export , (struct var *vp ));
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_PROTOTYPE(void ronly , (struct var *vp ));
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_PROTOTYPE(int isassign , (char *s ));
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_PROTOTYPE(int checkname , (char *cp ));
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_PROTOTYPE(int assign , (char *s , int cf ));
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_PROTOTYPE(void putvlist , (int f , int out ));
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_PROTOTYPE(int eqname , (char *n1 , char *n2 ));
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_PROTOTYPE(int execute , (struct op *t , int *pin , int *pout , int act ));
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/* -------- io.h -------- */
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/* io buffer */
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struct iobuf {
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unsigned id; /* buffer id */
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char buf[512]; /* buffer */
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char *bufp; /* pointer into buffer */
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char *ebufp; /* pointer to end of buffer */
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};
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/* possible arguments to an IO function */
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struct ioarg {
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char *aword;
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char **awordlist;
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int afile; /* file descriptor */
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unsigned afid; /* buffer id */
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long afpos; /* file position */
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struct iobuf *afbuf; /* buffer for this file */
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};
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Extern struct ioarg ioargstack[NPUSH];
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#define AFID_NOBUF (~0)
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#define AFID_ID 0
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/* an input generator's state */
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struct io {
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int (*iofn)(_VOID);
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struct ioarg *argp;
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int peekc;
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char prev; /* previous character read by readc() */
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char nlcount; /* for `'s */
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char xchar; /* for `'s */
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char task; /* reason for pushed IO */
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};
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Extern struct io iostack[NPUSH];
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#define XOTHER 0 /* none of the below */
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#define XDOLL 1 /* expanding ${} */
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#define XGRAVE 2 /* expanding `'s */
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#define XIO 3 /* file IO */
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/* in substitution */
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#define INSUB() (e.iop->task == XGRAVE || e.iop->task == XDOLL)
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/*
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* input generators for IO structure
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*/
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_PROTOTYPE(int nlchar , (struct ioarg *ap ));
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_PROTOTYPE(int strchar , (struct ioarg *ap ));
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_PROTOTYPE(int qstrchar , (struct ioarg *ap ));
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_PROTOTYPE(int filechar , (struct ioarg *ap ));
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_PROTOTYPE(int herechar , (struct ioarg *ap ));
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_PROTOTYPE(int linechar , (struct ioarg *ap ));
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_PROTOTYPE(int gravechar , (struct ioarg *ap , struct io *iop ));
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_PROTOTYPE(int qgravechar , (struct ioarg *ap , struct io *iop ));
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_PROTOTYPE(int dolchar , (struct ioarg *ap ));
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_PROTOTYPE(int wdchar , (struct ioarg *ap ));
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_PROTOTYPE(void scraphere , (void));
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_PROTOTYPE(void freehere , (int area ));
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_PROTOTYPE(void gethere , (void));
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_PROTOTYPE(void markhere , (char *s , struct ioword *iop ));
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_PROTOTYPE(int herein , (char *hname , int xdoll ));
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_PROTOTYPE(int run , (struct ioarg *argp , int (*f)(_VOID)));
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/*
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* IO functions
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*/
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_PROTOTYPE(int eofc , (void));
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_PROTOTYPE(int getc , (int ec ));
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_PROTOTYPE(int readc , (void));
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_PROTOTYPE(void unget , (int c ));
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_PROTOTYPE(void ioecho , (int c ));
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_PROTOTYPE(void prs , (char *s ));
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_PROTOTYPE(void putc , (int c ));
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_PROTOTYPE(void prn , (unsigned u ));
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_PROTOTYPE(void closef , (int i ));
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_PROTOTYPE(void closeall , (void));
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/*
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* IO control
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*/
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_PROTOTYPE(void pushio , (struct ioarg *argp , int (*fn)(_VOID)));
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_PROTOTYPE(int remap , (int fd ));
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_PROTOTYPE(int openpipe , (int *pv ));
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_PROTOTYPE(void closepipe , (int *pv ));
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_PROTOTYPE(struct io *setbase , (struct io *ip ));
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extern struct ioarg temparg; /* temporary for PUSHIO */
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#define PUSHIO(what,arg,gen) ((temparg.what = (arg)),pushio(&temparg,(gen)))
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#define RUN(what,arg,gen) ((temparg.what = (arg)), run(&temparg,(gen)))
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/* -------- word.h -------- */
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#ifndef WORD_H
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#define WORD_H 1
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struct wdblock {
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short w_bsize;
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short w_nword;
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/* bounds are arbitrary */
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char *w_words[1];
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};
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_PROTOTYPE(struct wdblock *addword , (char *wd , struct wdblock *wb ));
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_PROTOTYPE(struct wdblock *newword , (int nw ));
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_PROTOTYPE(char **getwords , (struct wdblock *wb ));
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#endif
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/* -------- area.h -------- */
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/*
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* storage allocation
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*/
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_PROTOTYPE(char *getcell , (unsigned nbytes ));
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_PROTOTYPE(void garbage , (void));
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_PROTOTYPE(void setarea , (char *cp , int a ));
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_PROTOTYPE(int getarea , (char *cp ));
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_PROTOTYPE(void freearea , (int a ));
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_PROTOTYPE(void freecell , (char *cp ));
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Extern int areanum; /* current allocation area */
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#define NEW(type) (type *)getcell(sizeof(type))
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#define DELETE(obj) freecell((char *)obj)
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