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Annotation of 40BSD/cmd/oldcsh/sh.err.c, revision 1.1

1.1     ! root        1: /* Copyright (c) 1979 Regents of the University of California */
        !             2: #include "sh.h"
        !             3: 
        !             4: /*
        !             5:  * C Shell
        !             6:  */
        !             7: 
        !             8: bool   errspl;                 /* Argument to error was spliced by seterr2 */
        !             9: char   one[2] = { '1', 0 };
        !            10: char   *onev[2] = { one, NOSTR };
        !            11: /*
        !            12:  * Print error string s with optional argument arg.
        !            13:  * This routine always resets or exits.  The flag haderr
        !            14:  * is set so the routine who catches the unwind can propogate
        !            15:  * it if they want.
        !            16:  *
        !            17:  * Note that any open files at the point of error will eventually
        !            18:  * be closed in the routine process in sh.c which is the only
        !            19:  * place error unwinds are ever caught.
        !            20:  */
        !            21: error(s, arg)
        !            22:        char *s;
        !            23: {
        !            24:        register char **v;
        !            25:        register char *ep;
        !            26: 
        !            27:        /*
        !            28:         * Must flush before we print as we wish output before the error
        !            29:         * to go on (some form of) standard output, while output after
        !            30:         * goes on (some form of) diagnostic output.
        !            31:         * If didfds then output will go to 1/2 else to FSHOUT/FSHDIAG.
        !            32:         * See flush in sh.print.c.
        !            33:         */
        !            34:        flush();
        !            35:        haderr = 1;             /* Now to diagnostic output */
        !            36:        timflg = 0;             /* This isn't otherwise reset */
        !            37:        if (v = pargv)
        !            38:                pargv = 0, blkfree(v);
        !            39:        if (v = gargv)
        !            40:                gargv = 0, blkfree(v);
        !            41: 
        !            42:        /*
        !            43:         * A zero arguments causes no printing, else print
        !            44:         * an error diagnostic here.
        !            45:         */
        !            46:        if (s)
        !            47:                printf(s, arg), printf(".\n");
        !            48: 
        !            49:        didfds = 0;             /* Forget about 0,1,2 */
        !            50:        if ((ep = err) && errspl) {
        !            51:                errspl = 0;
        !            52:                xfree(ep);
        !            53:        }
        !            54:        errspl = 0;
        !            55: 
        !            56:        /*
        !            57:         * Reset the state of the input.
        !            58:         * This buffered seek to end of file will also
        !            59:         * clear the while/foreach stack.
        !            60:         */
        !            61:        btoeof();
        !            62: 
        !            63:        /*
        !            64:         * Go away if -e or we are a child shell
        !            65:         */
        !            66:        if (exiterr || child)
        !            67:                exit(1);
        !            68: 
        !            69:        setq("status", onev, &shvhed);
        !            70:        reset();                /* Unwind */
        !            71: }
        !            72: 
        !            73: /*
        !            74:  * Perror is the shells version of perror which should otherwise
        !            75:  * never be called.
        !            76:  */
        !            77: Perror(s)
        !            78:        char *s;
        !            79: {
        !            80: 
        !            81:        /*
        !            82:         * Perror uses unit 2, thus if we didn't set up the fd's
        !            83:         * we must set up unit 2 now else the diagnostic will disappear
        !            84:         */
        !            85:        if (!didfds) {
        !            86:                register int oerrno = errno;
        !            87: 
        !            88:                dcopy(SHDIAG, 2);
        !            89:                errno = oerrno;
        !            90:        }
        !            91:        perror(s);
        !            92:        error(0);               /* To exit or unwind */
        !            93: }
        !            94: 
        !            95: /*
        !            96:  * For builtin functions, the routine bferr may be called
        !            97:  * to print a diagnostic of the form:
        !            98:  *     name: Diagnostic.
        !            99:  * where name has been setup by setname.
        !           100:  * (Made into a macro to save space)
        !           101:  *
        !           102: char   *bname;
        !           103: 
        !           104: setname(cp)
        !           105:        char *cp;
        !           106: {
        !           107: 
        !           108:        bname = cp;
        !           109: }
        !           110:  */
        !           111: 
        !           112: bferr(cp)
        !           113:        char *cp;
        !           114: {
        !           115: 
        !           116:        flush();
        !           117:        haderr = 1;
        !           118:        printf("%s: ", bname);
        !           119:        error(cp);
        !           120: }
        !           121: 
        !           122: /*
        !           123:  * The parser and scanner set up errors for later by calling seterr,
        !           124:  * which sets the variable err as a side effect; later to be tested,
        !           125:  * e.g. in process.
        !           126:  */
        !           127: seterr(s)
        !           128:        char *s;
        !           129: {
        !           130: 
        !           131:        if (err == 0)
        !           132:                err = s, errspl = 0;
        !           133: }
        !           134: 
        !           135: /* Set err to a splice of cp and dp, to be freed later in error() */
        !           136: seterr2(cp, dp)
        !           137:        char *cp, *dp;
        !           138: {
        !           139: 
        !           140:        if (err)
        !           141:                return;
        !           142:        err = strspl(cp, dp);
        !           143:        errspl++;
        !           144: }
        !           145: 
        !           146: /* Set err to a splice of cp with a string form of character d */
        !           147: seterrc(cp, d)
        !           148:        char *cp, d;
        !           149: {
        !           150:        char chbuf[2];
        !           151: 
        !           152:        chbuf[0] = d;
        !           153:        chbuf[1] = 0;
        !           154:        seterr2(cp, chbuf);
        !           155: }

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