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Annotation of 42BSD/bin/csh/sh.h, revision 1.1

1.1     ! root        1: /* sh.h 4.10 83/07/01 */
        !             2: 
        !             3: #include "sh.local.h"
        !             4: #include <sys/time.h>
        !             5: #include <sys/resource.h>
        !             6: 
        !             7: /*
        !             8:  * C shell
        !             9:  *
        !            10:  * Bill Joy, UC Berkeley
        !            11:  * October, 1978; May 1980
        !            12:  *
        !            13:  * Jim Kulp, IIASA, Laxenburg Austria
        !            14:  * April, 1980
        !            15:  */
        !            16: #include <sys/param.h>
        !            17: #include <sys/stat.h>
        !            18: 
        !            19: #define        isdir(d)        ((d.st_mode & S_IFMT) == S_IFDIR)
        !            20: 
        !            21: #include <errno.h>
        !            22: #include <setjmp.h>
        !            23: #include <signal.h>
        !            24: #include <sys/times.h>
        !            25: 
        !            26: typedef        char    bool;
        !            27: 
        !            28: #define        eq(a, b)        (strcmp(a, b) == 0)
        !            29: 
        !            30: /*
        !            31:  * For 4.2bsd signals.
        !            32:  */
        !            33: #define        mask(s)         (1 << ((s)-1))
        !            34: #define        sigsys(s, a)    signal(s, a)
        !            35: #define        sighold(s)      sigblock(mask(s))
        !            36: 
        !            37: /*
        !            38:  * Global flags
        !            39:  */
        !            40: bool   chkstop;                /* Warned of stopped jobs... allow exit */
        !            41: bool   didcch;                 /* Have closed unused fd's for child */
        !            42: bool   didfds;                 /* Have setup i/o fd's for child */
        !            43: bool   doneinp;                /* EOF indicator after reset from readc */
        !            44: bool   exiterr;                /* Exit if error or non-zero exit status */
        !            45: bool   child;                  /* Child shell ... errors cause exit */
        !            46: bool   haderr;                 /* Reset was because of an error */
        !            47: bool   intty;                  /* Input is a tty */
        !            48: bool   intact;                 /* We are interactive... therefore prompt */
        !            49: bool   justpr;                 /* Just print because of :p hist mod */
        !            50: bool   loginsh;                /* We are a loginsh -> .login/.logout */
        !            51: bool   neednote;               /* Need to pnotify() */
        !            52: bool   noexec;                 /* Don't execute, just syntax check */
        !            53: bool   pjobs;                  /* want to print jobs if interrupted */
        !            54: bool   setintr;                /* Set interrupts on/off -> Wait intr... */
        !            55: bool   timflg;                 /* Time the next waited for command */
        !            56: 
        !            57: /*
        !            58:  * Global i/o info
        !            59:  */
        !            60: char   *arginp;                /* Argument input for sh -c and internal `xx` */
        !            61: int    onelflg;                /* 2 -> need line for -t, 1 -> exit on read */
        !            62: char   *file;                  /* Name of shell file for $0 */
        !            63: 
        !            64: char   *err;                   /* Error message from scanner/parser */
        !            65: int    errno;                  /* Error from C library routines */
        !            66: char   *shtemp;                /* Temp name for << shell files in /tmp */
        !            67: struct timeval time0;          /* Time at which the shell started */
        !            68: struct rusage ru0;
        !            69: 
        !            70: /*
        !            71:  * Miscellany
        !            72:  */
        !            73: char   *doldol;                /* Character pid for $$ */
        !            74: int    uid;                    /* Invokers uid */
        !            75: time_t chktim;                 /* Time mail last checked */
        !            76: int    shpgrp;                 /* Pgrp of shell */
        !            77: int    tpgrp;                  /* Terminal process group */
        !            78: /* If tpgrp is -1, leave tty alone! */
        !            79: int    opgrp;                  /* Initial pgrp and tty pgrp */
        !            80: int    oldisc;                 /* Initial line discipline or -1 */
        !            81: struct tms shtimes;            /* shell and child times for process timing */
        !            82: 
        !            83: /*
        !            84:  * These are declared here because they want to be
        !            85:  * initialized in sh.init.c (to allow them to be made readonly)
        !            86:  */
        !            87: 
        !            88: struct biltins {
        !            89:        char    *bname;
        !            90:        int     (*bfunct)();
        !            91:        short   minargs, maxargs;
        !            92: } bfunc[];
        !            93: 
        !            94: #define        INF     1000
        !            95: 
        !            96: struct srch {
        !            97:        char    *s_name;
        !            98:        short   s_value;
        !            99: } srchn[];
        !           100: 
        !           101: /*
        !           102:  * To be able to redirect i/o for builtins easily, the shell moves the i/o
        !           103:  * descriptors it uses away from 0,1,2.
        !           104:  * Ideally these should be in units which are closed across exec's
        !           105:  * (this saves work) but for version 6, this is not usually possible.
        !           106:  * The desired initial values for these descriptors are defined in
        !           107:  * sh.local.h.
        !           108:  */
        !           109: short  SHIN;                   /* Current shell input (script) */
        !           110: short  SHOUT;                  /* Shell output */
        !           111: short  SHDIAG;                 /* Diagnostic output... shell errs go here */
        !           112: short  OLDSTD;                 /* Old standard input (def for cmds) */
        !           113: 
        !           114: /*
        !           115:  * Error control
        !           116:  *
        !           117:  * Errors in scanning and parsing set up an error message to be printed
        !           118:  * at the end and complete.  Other errors always cause a reset.
        !           119:  * Because of source commands and .cshrc we need nested error catches.
        !           120:  */
        !           121: 
        !           122: jmp_buf        reslab;
        !           123: 
        !           124: #define        setexit()       setjmp(reslab)
        !           125: #define        reset()         longjmp(reslab)
        !           126:        /* Should use structure assignment here */
        !           127: #define        getexit(a)      copy((char *)(a), (char *)reslab, sizeof reslab)
        !           128: #define        resexit(a)      copy((char *)reslab, ((char *)(a)), sizeof reslab)
        !           129: 
        !           130: char   *gointr;                /* Label for an onintr transfer */
        !           131: int    (*parintr)();           /* Parents interrupt catch */
        !           132: int    (*parterm)();           /* Parents terminate catch */
        !           133: 
        !           134: /*
        !           135:  * Lexical definitions.
        !           136:  *
        !           137:  * All lexical space is allocated dynamically.
        !           138:  * The eighth bit of characters is used to prevent recognition,
        !           139:  * and eventually stripped.
        !           140:  */
        !           141: #define        QUOTE   0200            /* Eighth char bit used internally for 'ing */
        !           142: #define        TRIM    0177            /* Mask to strip quote bit */
        !           143: 
        !           144: /*
        !           145:  * Each level of input has a buffered input structure.
        !           146:  * There are one or more blocks of buffered input for each level,
        !           147:  * exactly one if the input is seekable and tell is available.
        !           148:  * In other cases, the shell buffers enough blocks to keep all loops
        !           149:  * in the buffer.
        !           150:  */
        !           151: struct Bin {
        !           152:        off_t   Bfseekp;                /* Seek pointer */
        !           153:        off_t   Bfbobp;                 /* Seekp of beginning of buffers */
        !           154:        off_t   Bfeobp;                 /* Seekp of end of buffers */
        !           155:        short   Bfblocks;               /* Number of buffer blocks */
        !           156:        char    **Bfbuf;                /* The array of buffer blocks */
        !           157: } B;
        !           158: 
        !           159: #define        fseekp  B.Bfseekp
        !           160: #define        fbobp   B.Bfbobp
        !           161: #define        feobp   B.Bfeobp
        !           162: #define        fblocks B.Bfblocks
        !           163: #define        fbuf    B.Bfbuf
        !           164: 
        !           165: off_t  btell();
        !           166: 
        !           167: /*
        !           168:  * The shell finds commands in loops by reseeking the input
        !           169:  * For whiles, in particular, it reseeks to the beginning of the
        !           170:  * line the while was on; hence the while placement restrictions.
        !           171:  */
        !           172: off_t  lineloc;
        !           173: 
        !           174: #ifdef TELL
        !           175: off_t  tell();
        !           176: bool   cantell;                        /* Is current source tellable ? */
        !           177: #endif
        !           178: 
        !           179: /*
        !           180:  * Input lines are parsed into doubly linked circular
        !           181:  * lists of words of the following form.
        !           182:  */
        !           183: struct wordent {
        !           184:        char    *word;
        !           185:        struct  wordent *prev;
        !           186:        struct  wordent *next;
        !           187: };
        !           188: 
        !           189: /*
        !           190:  * During word building, both in the initial lexical phase and
        !           191:  * when expanding $ variable substitutions, expansion by `!' and `$'
        !           192:  * must be inhibited when reading ahead in routines which are themselves
        !           193:  * processing `!' and `$' expansion or after characters such as `\' or in
        !           194:  * quotations.  The following flags are passed to the getC routines
        !           195:  * telling them which of these substitutions are appropriate for the
        !           196:  * next character to be returned.
        !           197:  */
        !           198: #define        DODOL   1
        !           199: #define        DOEXCL  2
        !           200: #define        DOALL   DODOL|DOEXCL
        !           201: 
        !           202: /*
        !           203:  * Labuf implements a general buffer for lookahead during lexical operations.
        !           204:  * Text which is to be placed in the input stream can be stuck here.
        !           205:  * We stick parsed ahead $ constructs during initial input,
        !           206:  * process id's from `$$', and modified variable values (from qualifiers
        !           207:  * during expansion in sh.dol.c) here.
        !           208:  */
        !           209: char   labuf[BUFSIZ];
        !           210: 
        !           211: char   *lap;
        !           212: 
        !           213: /*
        !           214:  * Parser structure
        !           215:  *
        !           216:  * Each command is parsed to a tree of command structures and
        !           217:  * flags are set bottom up during this process, to be propagated down
        !           218:  * as needed during the semantics/exeuction pass (sh.sem.c).
        !           219:  */
        !           220: struct command {
        !           221:        short   t_dtyp;                         /* Type of node */
        !           222:        short   t_dflg;                         /* Flags, e.g. FAND|... */
        !           223:        union {
        !           224:                char    *T_dlef;                /* Input redirect word */
        !           225:                struct  command *T_dcar;        /* Left part of list/pipe */
        !           226:        } L;
        !           227:        union {
        !           228:                char    *T_drit;                /* Output redirect word */
        !           229:                struct  command *T_dcdr;        /* Right part of list/pipe */
        !           230:        } R;
        !           231: #define        t_dlef  L.T_dlef
        !           232: #define        t_dcar  L.T_dcar
        !           233: #define        t_drit  R.T_drit
        !           234: #define        t_dcdr  R.T_dcdr
        !           235:        char    **t_dcom;                       /* Command/argument vector */
        !           236:        struct  command *t_dspr;                /* Pointer to ()'d subtree */
        !           237:        short   t_nice;
        !           238: };
        !           239: 
        !           240: #define        TCOM    1               /* t_dcom <t_dlef >t_drit       */
        !           241: #define        TPAR    2               /* ( t_dspr ) <t_dlef >t_drit   */
        !           242: #define        TFIL    3               /* t_dlef | t_drit              */
        !           243: #define        TLST    4               /* t_dlef ; t_drit              */
        !           244: #define        TOR     5               /* t_dlef || t_drit             */
        !           245: #define        TAND    6               /* t_dlef && t_drit             */
        !           246: 
        !           247: #define        FSAVE   (FNICE|FTIME|FNOHUP)    /* save these when re-doing */
        !           248: 
        !           249: #define        FAND    (1<<0)          /* executes in background       */
        !           250: #define        FCAT    (1<<1)          /* output is redirected >>      */
        !           251: #define        FPIN    (1<<2)          /* input is a pipe              */
        !           252: #define        FPOU    (1<<3)          /* output is a pipe             */
        !           253: #define        FPAR    (1<<4)          /* don't fork, last ()ized cmd  */
        !           254: #define        FINT    (1<<5)          /* should be immune from intr's */
        !           255: /* spare */
        !           256: #define        FDIAG   (1<<7)          /* redirect unit 2 with unit 1  */
        !           257: #define        FANY    (1<<8)          /* output was !                 */
        !           258: #define        FHERE   (1<<9)          /* input redirection is <<      */
        !           259: #define        FREDO   (1<<10)         /* reexec aft if, repeat,...    */
        !           260: #define        FNICE   (1<<11)         /* t_nice is meaningful */
        !           261: #define        FNOHUP  (1<<12)         /* nohup this command */
        !           262: #define        FTIME   (1<<13)         /* time this command */
        !           263: 
        !           264: /*
        !           265:  * The keywords for the parser
        !           266:  */
        !           267: #define        ZBREAK          0
        !           268: #define        ZBRKSW          1
        !           269: #define        ZCASE           2
        !           270: #define        ZDEFAULT        3
        !           271: #define        ZELSE           4
        !           272: #define        ZEND            5
        !           273: #define        ZENDIF          6
        !           274: #define        ZENDSW          7
        !           275: #define        ZEXIT           8
        !           276: #define        ZFOREACH        9
        !           277: #define        ZGOTO           10
        !           278: #define        ZIF             11
        !           279: #define        ZLABEL          12
        !           280: #define        ZLET            13
        !           281: #define        ZSET            14
        !           282: #define        ZSWITCH         15
        !           283: #define        ZTEST           16
        !           284: #define        ZTHEN           17
        !           285: #define        ZWHILE          18
        !           286: 
        !           287: /*
        !           288:  * Structure defining the existing while/foreach loops at this
        !           289:  * source level.  Loops are implemented by seeking back in the
        !           290:  * input.  For foreach (fe), the word list is attached here.
        !           291:  */
        !           292: struct whyle {
        !           293:        off_t   w_start;                /* Point to restart loop */
        !           294:        off_t   w_end;                  /* End of loop (0 if unknown) */
        !           295:        char    **w_fe, **w_fe0;        /* Current/initial wordlist for fe */
        !           296:        char    *w_fename;              /* Name for fe */
        !           297:        struct  whyle *w_next;          /* Next (more outer) loop */
        !           298: } *whyles;
        !           299: 
        !           300: /*
        !           301:  * Variable structure
        !           302:  *
        !           303:  * Lists of aliases and variables are sorted alphabetically by name
        !           304:  */
        !           305: struct varent {
        !           306:        char    **vec;          /* Array of words which is the value */
        !           307:        char    *name;          /* Name of variable/alias */
        !           308:        struct  varent *link;
        !           309: } shvhed, aliases;
        !           310: 
        !           311: /*
        !           312:  * The following are for interfacing redo substitution in
        !           313:  * aliases to the lexical routines.
        !           314:  */
        !           315: struct wordent *alhistp;               /* Argument list (first) */
        !           316: struct wordent *alhistt;               /* Node after last in arg list */
        !           317: char   **alvec;                        /* The (remnants of) alias vector */
        !           318: 
        !           319: /*
        !           320:  * Filename/command name expansion variables
        !           321:  */
        !           322: short  gflag;                          /* After tglob -> is globbing needed? */
        !           323: 
        !           324: /*
        !           325:  * A reasonable limit on number of arguments would seem to be
        !           326:  * the maximum number of characters in an arg list / 6.
        !           327:  */
        !           328: #define        GAVSIZ  NCARGS / 6
        !           329: 
        !           330: /*
        !           331:  * Variables for filename expansion
        !           332:  */
        !           333: char   **gargv;                        /* Pointer to the (stack) arglist */
        !           334: short  gargc;                          /* Number args in gargv */
        !           335: short  gnleft;
        !           336: 
        !           337: /*
        !           338:  * Variables for command expansion.
        !           339:  */
        !           340: char   **pargv;                        /* Pointer to the argv list space */
        !           341: char   *pargs;                         /* Pointer to start current word */
        !           342: short  pargc;                          /* Count of arguments in pargv */
        !           343: short  pnleft;                         /* Number of chars left in pargs */
        !           344: char   *pargcp;                        /* Current index into pargs */
        !           345: 
        !           346: /*
        !           347:  * History list
        !           348:  *
        !           349:  * Each history list entry contains an embedded wordlist
        !           350:  * from the scanner, a number for the event, and a reference count
        !           351:  * to aid in discarding old entries.
        !           352:  *
        !           353:  * Essentially "invisible" entries are put on the history list
        !           354:  * when history substitution includes modifiers, and thrown away
        !           355:  * at the next discarding since their event numbers are very negative.
        !           356:  */
        !           357: struct Hist {
        !           358:        struct  wordent Hlex;
        !           359:        int     Hnum;
        !           360:        int     Href;
        !           361:        struct  Hist *Hnext;
        !           362: } Histlist;
        !           363: 
        !           364: struct wordent paraml;                 /* Current lexical word list */
        !           365: int    eventno;                        /* Next events number */
        !           366: int    lastev;                         /* Last event reference (default) */
        !           367: 
        !           368: char   HIST;                           /* history invocation character */
        !           369: char   HISTSUB;                        /* auto-substitute character */
        !           370: 
        !           371: char   *Dfix1();
        !           372: struct varent *adrof(), *adrof1();
        !           373: char   **blkcat();
        !           374: char   **blkcpy();
        !           375: char   **blkend();
        !           376: char   **blkspl();
        !           377: char   *calloc();
        !           378: char   *cname();
        !           379: char   **copyblk();
        !           380: char   **dobackp();
        !           381: char   *domod();
        !           382: struct wordent *dosub();
        !           383: char   *exp3();
        !           384: char   *exp3a();
        !           385: char   *exp4();
        !           386: char   *exp5();
        !           387: char   *exp6();
        !           388: struct Hist *enthist();
        !           389: struct Hist *findev();
        !           390: struct wordent *freenod();
        !           391: char   *getenv();
        !           392: char   *getinx();
        !           393: struct varent *getvx();
        !           394: struct passwd *getpwnam();
        !           395: struct wordent *gethent();
        !           396: struct wordent *getsub();
        !           397: char   *getwd();
        !           398: char   *globone();
        !           399: struct biltins *isbfunc();
        !           400: char   **glob();
        !           401: char   *operate();
        !           402: int    phup();
        !           403: int    pintr();
        !           404: int    pchild();
        !           405: char   *putn();
        !           406: char   **saveblk();
        !           407: char   *savestr();
        !           408: char   *strcat();
        !           409: char   *strcpy();
        !           410: char   *strend();
        !           411: char   *strings();
        !           412: char   *strip();
        !           413: char   *strspl();
        !           414: char   *subword();
        !           415: struct command *syntax();
        !           416: struct command *syn0();
        !           417: struct command *syn1();
        !           418: struct command *syn1a();
        !           419: struct command *syn1b();
        !           420: struct command *syn2();
        !           421: struct command *syn3();
        !           422: int    tglob();
        !           423: int    trim();
        !           424: char   *value(), *value1();
        !           425: char   *xhome();
        !           426: char   *xname();
        !           427: char   *xset();
        !           428: 
        !           429: #define        NOSTR   ((char *) 0)
        !           430: 
        !           431: /*
        !           432:  * setname is a macro to save space (see sh.err.c)
        !           433:  */
        !           434: char   *bname;
        !           435: #define        setname(a)      bname = (a);
        !           436: 
        !           437: #ifdef VFORK
        !           438: char   *Vsav;
        !           439: char   **Vav;
        !           440: char   *Vdp;
        !           441: #endif
        !           442: 
        !           443: char   **evalvec;
        !           444: char   *evalp;
        !           445: 
        !           446: struct mesg {
        !           447:        char    *iname;         /* name from /usr/include */
        !           448:        char    *pname;         /* print name */
        !           449: } mesg[];

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