Minix: src/commands/sh/sh.h Source File

00001 #include <stdlib.h>
00002 #include <string.h>
00003 #include <unistd.h>
00004 #include <fcntl.h>
00005 
00006 /* Need a way to have void used for ANSI, nothing for K&R. */
00007 #ifndef _ANSI
00008 #undef _VOID
00009 #define _VOID
00010 #endif
00011 
00012 /* -------- sh.h -------- */
00013 /*
00014  * shell
00015  */
00016 
00017 #define LINELIM 4096
00018 #define NPUSH   8       /* limit to input nesting */
00019 
00020 #define NOFILE  20      /* Number of open files */
00021 #define NUFILE  10      /* Number of user-accessible files */
00022 #define FDBASE  10      /* First file usable by Shell */
00023 
00024 /*
00025  * values returned by wait
00026  */
00027 #define WAITSIG(s) ((s)&0177)
00028 #define WAITVAL(s) (((s)>>8)&0377)
00029 #define WAITCORE(s) (((s)&0200)!=0)
00030 
00031 /*
00032  * library and system defintions
00033  */
00034 #ifdef __STDC__
00035 typedef void xint;      /* base type of jmp_buf, for not broken compilers */
00036 #else
00037 typedef char * xint;    /* base type of jmp_buf, for broken compilers */
00038 #endif
00039 
00040 /*
00041  * shell components
00042  */
00043 /* #include "area.h" */
00044 /* #include "word.h" */
00045 /* #include "io.h" */
00046 /* #include "var.h" */
00047 
00048 #define QUOTE   0200
00049 
00050 #define NOBLOCK ((struct op *)NULL)
00051 #define NOWORD  ((char *)NULL)
00052 #define NOWORDS ((char **)NULL)
00053 #define NOPIPE  ((int *)NULL)
00054 
00055 /*
00056  * Description of a command or an operation on commands.
00057  * Might eventually use a union.
00058  */
00059 struct op {
00060         int     type;   /* operation type, see below */
00061         char    **words;        /* arguments to a command */
00062         struct  ioword  **ioact;        /* IO actions (eg, < > >>) */
00063         struct op *left;
00064         struct op *right;
00065         char    *str;   /* identifier for case and for */
00066 };
00067 
00068 #define TCOM    1       /* command */
00069 #define TPAREN  2       /* (c-list) */
00070 #define TPIPE   3       /* a | b */
00071 #define TLIST   4       /* a [&;] b */
00072 #define TOR     5       /* || */
00073 #define TAND    6       /* && */
00074 #define TFOR    7
00075 #define TDO     8
00076 #define TCASE   9
00077 #define TIF     10
00078 #define TWHILE  11
00079 #define TUNTIL  12
00080 #define TELIF   13
00081 #define TPAT    14      /* pattern in case */
00082 #define TBRACE  15      /* {c-list} */
00083 #define TASYNC  16      /* c & */
00084 
00085 /*
00086  * actions determining the environment of a process
00087  */
00088 #define BIT(i)  (1<<(i))
00089 #define FEXEC   BIT(0)  /* execute without forking */
00090 
00091 /*
00092  * flags to control evaluation of words
00093  */
00094 #define DOSUB   1       /* interpret $, `, and quotes */
00095 #define DOBLANK 2       /* perform blank interpretation */
00096 #define DOGLOB  4       /* interpret [?* */
00097 #define DOKEY   8       /* move words with `=' to 2nd arg. list */
00098 #define DOTRIM  16      /* trim resulting string */
00099 
00100 #define DOALL   (DOSUB|DOBLANK|DOGLOB|DOKEY|DOTRIM)
00101 
00102 Extern  char    **dolv;
00103 Extern  int     dolc;
00104 Extern  int     exstat;
00105 Extern  char    gflg;
00106 Extern  int     talking;        /* interactive (talking-type wireless) */
00107 Extern  int     execflg;
00108 Extern  int     multiline;      /* \n changed to ; */
00109 Extern  struct  op      *outtree;       /* result from parser */
00110 
00111 Extern  xint    *failpt;
00112 Extern  xint    *errpt;
00113 
00114 struct  brkcon {
00115         jmp_buf brkpt;
00116         struct  brkcon  *nextlev;
00117 } ;
00118 Extern  struct brkcon   *brklist;
00119 Extern  int     isbreak;
00120 
00121 /*
00122  * redirection
00123  */
00124 struct ioword {
00125         short   io_unit;        /* unit affected */
00126         short   io_flag;        /* action (below) */
00127         char    *io_name;       /* file name */
00128 };
00129 #define IOREAD  1       /* < */
00130 #define IOHERE  2       /* << (here file) */
00131 #define IOWRITE 4       /* > */
00132 #define IOCAT   8       /* >> */
00133 #define IOXHERE 16      /* ${}, ` in << */
00134 #define IODUP   32      /* >&digit */
00135 #define IOCLOSE 64      /* >&- */
00136 
00137 #define IODEFAULT (-1)  /* token for default IO unit */
00138 
00139 Extern  struct  wdblock *wdlist;
00140 Extern  struct  wdblock *iolist;
00141 
00142 /*
00143  * parsing & execution environment
00144  */
00145 extern struct   env {
00146         char    *linep;
00147         struct  io      *iobase;
00148         struct  io      *iop;
00149         xint    *errpt;
00150         int     iofd;
00151         struct  env     *oenv;
00152 } e;
00153 
00154 /*
00155  * flags:
00156  * -e: quit on error
00157  * -k: look for name=value everywhere on command line
00158  * -n: no execution
00159  * -t: exit after reading and executing one command
00160  * -v: echo as read
00161  * -x: trace
00162  * -u: unset variables net diagnostic
00163  */
00164 extern  char    *flag;
00165 
00166 extern  char    *null;  /* null value for variable */
00167 extern  int     intr;   /* interrupt pending */
00168 
00169 Extern  char    *trap[_NSIG+1];
00170 Extern  char    ourtrap[_NSIG+1];
00171 Extern  int     trapset;        /* trap pending */
00172 
00173 extern  int     heedint;        /* heed interrupt signals */
00174 
00175 Extern  int     yynerrs;        /* yacc */
00176 
00177 Extern  char    line[LINELIM];
00178 extern  char    *elinep;
00179 
00180 /*
00181  * other functions
00182  */
00183 #ifdef __STDC__
00184 int (*inbuilt(char *s ))(void);
00185 #else
00186 int (*inbuilt())();
00187 #endif
00188 _PROTOTYPE(char *rexecve , (char *c , char **v , char **envp ));
00189 _PROTOTYPE(char *space , (int n ));
00190 _PROTOTYPE(char *strsave , (char *s , int a ));
00191 _PROTOTYPE(char *evalstr , (char *cp , int f ));
00192 _PROTOTYPE(char *putn , (int n ));
00193 _PROTOTYPE(char *itoa , (unsigned u , int n ));
00194 _PROTOTYPE(char *unquote , (char *as ));
00195 _PROTOTYPE(struct var *lookup , (char *n ));
00196 _PROTOTYPE(int rlookup , (char *n ));
00197 _PROTOTYPE(struct wdblock *glob , (char *cp , struct wdblock *wb ));
00198 _PROTOTYPE(int subgetc , (int ec , int quoted ));
00199 _PROTOTYPE(char **makenv , (void));
00200 _PROTOTYPE(char **eval , (char **ap , int f ));
00201 _PROTOTYPE(int setstatus , (int s ));
00202 _PROTOTYPE(int waitfor , (int lastpid , int canintr ));
00203 
00204 _PROTOTYPE(void onintr , (int s )); /* SIGINT handler */
00205 
00206 _PROTOTYPE(int newenv , (int f ));
00207 _PROTOTYPE(void quitenv , (void));
00208 _PROTOTYPE(void err , (char *s ));
00209 _PROTOTYPE(int anys , (char *s1 , char *s2 ));
00210 _PROTOTYPE(int any , (int c , char *s ));
00211 _PROTOTYPE(void next , (int f ));
00212 _PROTOTYPE(void setdash , (void));
00213 _PROTOTYPE(void onecommand , (void));
00214 _PROTOTYPE(void runtrap , (int i ));
00215 _PROTOTYPE(void xfree , (char *s ));
00216 _PROTOTYPE(int letter , (int c ));
00217 _PROTOTYPE(int digit , (int c ));
00218 _PROTOTYPE(int letnum , (int c ));
00219 _PROTOTYPE(int gmatch , (char *s , char *p ));
00220 
00221 /*
00222  * error handling
00223  */
00224 _PROTOTYPE(void leave , (void)); /* abort shell (or fail in subshell) */
00225 _PROTOTYPE(void fail , (void));  /* fail but return to process next command */
00226 _PROTOTYPE(void warn , (char *s ));
00227 _PROTOTYPE(void sig , (int i ));         /* default signal handler */
00228 
00229 /* -------- var.h -------- */
00230 
00231 struct  var {
00232         char    *value;
00233         char    *name;
00234         struct  var     *next;
00235         char    status;
00236 };
00237 #define COPYV   1       /* flag to setval, suggesting copy */
00238 #define RONLY   01      /* variable is read-only */
00239 #define EXPORT  02      /* variable is to be exported */
00240 #define GETCELL 04      /* name & value space was got with getcell */
00241 
00242 Extern  struct  var     *vlist;         /* dictionary */
00243 
00244 Extern  struct  var     *homedir;       /* home directory */
00245 Extern  struct  var     *prompt;        /* main prompt */
00246 Extern  struct  var     *cprompt;       /* continuation prompt */
00247 Extern  struct  var     *path;          /* search path for commands */
00248 Extern  struct  var     *shell;         /* shell to interpret command files */
00249 Extern  struct  var     *ifs;           /* field separators */
00250 
00251 _PROTOTYPE(int yyparse , (void));
00252 _PROTOTYPE(struct var *lookup , (char *n ));
00253 _PROTOTYPE(void setval , (struct var *vp , char *val ));
00254 _PROTOTYPE(void nameval , (struct var *vp , char *val , char *name ));
00255 _PROTOTYPE(void export , (struct var *vp ));
00256 _PROTOTYPE(void ronly , (struct var *vp ));
00257 _PROTOTYPE(int isassign , (char *s ));
00258 _PROTOTYPE(int checkname , (char *cp ));
00259 _PROTOTYPE(int assign , (char *s , int cf ));
00260 _PROTOTYPE(void putvlist , (int f , int out ));
00261 _PROTOTYPE(int eqname , (char *n1 , char *n2 ));
00262 
00263 _PROTOTYPE(int execute , (struct op *t , int *pin , int *pout , int act ));
00264 
00265 /* -------- io.h -------- */
00266 /* io buffer */
00267 struct iobuf {
00268   unsigned id;                          /* buffer id */
00269   char buf[512];                        /* buffer */
00270   char *bufp;                           /* pointer into buffer */
00271   char *ebufp;                          /* pointer to end of buffer */
00272 };
00273 
00274 /* possible arguments to an IO function */
00275 struct ioarg {
00276         char    *aword;
00277         char    **awordlist;
00278         int     afile;          /* file descriptor */
00279         unsigned afid;          /* buffer id */
00280         long    afpos;          /* file position */
00281         struct iobuf *afbuf;    /* buffer for this file */
00282 };
00283 Extern struct ioarg ioargstack[NPUSH];
00284 #define AFID_NOBUF      (~0)
00285 #define AFID_ID         0
00286 
00287 /* an input generator's state */
00288 struct  io {
00289         int     (*iofn)(_VOID);
00290         struct  ioarg   *argp;
00291         int     peekc;
00292         char    prev;           /* previous character read by readc() */
00293         char    nlcount;        /* for `'s */
00294         char    xchar;          /* for `'s */
00295         char    task;           /* reason for pushed IO */
00296 };
00297 Extern  struct  io      iostack[NPUSH];
00298 #define XOTHER  0       /* none of the below */
00299 #define XDOLL   1       /* expanding ${} */
00300 #define XGRAVE  2       /* expanding `'s */
00301 #define XIO     3       /* file IO */
00302 
00303 /* in substitution */
00304 #define INSUB() (e.iop->task == XGRAVE || e.iop->task == XDOLL)
00305 
00306 /*
00307  * input generators for IO structure
00308  */
00309 _PROTOTYPE(int nlchar , (struct ioarg *ap ));
00310 _PROTOTYPE(int strchar , (struct ioarg *ap ));
00311 _PROTOTYPE(int qstrchar , (struct ioarg *ap ));
00312 _PROTOTYPE(int filechar , (struct ioarg *ap ));
00313 _PROTOTYPE(int herechar , (struct ioarg *ap ));
00314 _PROTOTYPE(int linechar , (struct ioarg *ap ));
00315 _PROTOTYPE(int gravechar , (struct ioarg *ap , struct io *iop ));
00316 _PROTOTYPE(int qgravechar , (struct ioarg *ap , struct io *iop ));
00317 _PROTOTYPE(int dolchar , (struct ioarg *ap ));
00318 _PROTOTYPE(int wdchar , (struct ioarg *ap ));
00319 _PROTOTYPE(void scraphere , (void));
00320 _PROTOTYPE(void freehere , (int area ));
00321 _PROTOTYPE(void gethere , (void));
00322 _PROTOTYPE(void markhere , (char *s , struct ioword *iop ));
00323 _PROTOTYPE(int herein , (char *hname , int xdoll ));
00324 _PROTOTYPE(int run , (struct ioarg *argp , int (*f)(_VOID)));
00325 
00326 /*
00327  * IO functions
00328  */
00329 _PROTOTYPE(int eofc , (void));
00330 _PROTOTYPE(int getc , (int ec ));
00331 _PROTOTYPE(int readc , (void));
00332 _PROTOTYPE(void unget , (int c ));
00333 _PROTOTYPE(void ioecho , (int c ));
00334 _PROTOTYPE(void prs , (char *s ));
00335 _PROTOTYPE(void putc , (int c ));
00336 _PROTOTYPE(void prn , (unsigned u ));
00337 _PROTOTYPE(void closef , (int i ));
00338 _PROTOTYPE(void closeall , (void));
00339 
00340 /*
00341  * IO control
00342  */
00343 _PROTOTYPE(void pushio , (struct ioarg *argp , int (*fn)(_VOID)));
00344 _PROTOTYPE(int remap , (int fd ));
00345 _PROTOTYPE(int openpipe , (int *pv ));
00346 _PROTOTYPE(void closepipe , (int *pv ));
00347 _PROTOTYPE(struct io *setbase , (struct io *ip ));
00348 
00349 extern  struct  ioarg   temparg;        /* temporary for PUSHIO */
00350 #define PUSHIO(what,arg,gen) ((temparg.what = (arg)),pushio(&temparg,(gen)))
00351 #define RUN(what,arg,gen) ((temparg.what = (arg)), run(&temparg,(gen)))
00352 
00353 /* -------- word.h -------- */
00354 #ifndef WORD_H
00355 #define WORD_H  1
00356 struct  wdblock {
00357         short   w_bsize;
00358         short   w_nword;
00359         /* bounds are arbitrary */
00360         char    *w_words[1];
00361 };
00362 
00363 _PROTOTYPE(struct wdblock *addword , (char *wd , struct wdblock *wb ));
00364 _PROTOTYPE(struct wdblock *newword , (int nw ));
00365 _PROTOTYPE(char **getwords , (struct wdblock *wb ));
00366 #endif
00367 
00368 /* -------- area.h -------- */
00369 
00370 /*
00371  * storage allocation
00372  */
00373 _PROTOTYPE(char *getcell , (unsigned nbytes ));
00374 _PROTOTYPE(void garbage , (void));
00375 _PROTOTYPE(void setarea , (char *cp , int a ));
00376 _PROTOTYPE(int getarea , (char *cp ));
00377 _PROTOTYPE(void freearea , (int a ));
00378 _PROTOTYPE(void freecell , (char *cp ));
00379 
00380 Extern  int     areanum;        /* current allocation area */
00381 
00382 #define NEW(type) (type *)getcell(sizeof(type))
00383 #define DELETE(obj)     freecell((char *)obj)