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Annotation of researchv10no/cmd/basic/bite/src/ext.c, revision 1.1

1.1     ! root        1: /* Copyright Bell Telephone Laboratories Whippany, N.J.
        !             2: 
        !             3:  *     /////////////////////////////////////
        !             4:  *     /////////////////////////////////////
        !             5:  *     /////////////// ext$ ////////////////
        !             6:  *     /// J. P. Hawkins WH X4610 8C-001 ///
        !             7:  *     ///// Tue Feb 17 07:33:14 1981 //////
        !             8:  *     /////////////////////////////////////
        !             9:  *     /////////////////////////////////////
        !            10:  *     @(#) ext.c: V1.3 3/4/81
        !            11: 
        !            12:  * BASIC ext$(string,pos,len)
        !            13:  * return substring of string starting at position pos length len
        !            14:  * where string is a string expression and pos and len are
        !            15:  * numeric expressions.
        !            16:  */
        !            17: 
        !            18: #include       "bas.h"
        !            19: char *ext(args)
        !            20: char   args[];
        !            21: {
        !            22:        double  evalx();
        !            23:        char    *prncpy();
        !            24:        char    string[80],result[80];
        !            25:        char    pos[20],num[20];
        !            26:        int     posit,number;
        !            27:        char    *holdptr,*sptr;
        !            28: 
        !            29:        holdptr = args;
        !            30:        holdptr=prncpy(result,args)+1; /* get str field and point past ',' */
        !            31:        sptr=result;
        !            32:        holdptr=prncpy(pos,holdptr)+1; /* get position expr & point past ',' */
        !            33:        prncpy(num,holdptr);       /* get size expression */
        !            34:        posit = (int)evalx(pos)-1; /* evaluate the position field */
        !            35:        number = (int)evalx(num);  /* evaluate the size field */
        !            36:        evals(sptr,string);
        !            37:        strncpy(result,&string[posit],number); /* put the segment in result */
        !            38:        result[number] = '\0';          /* null terminate result */
        !            39: 
        !            40:        if(posit > strlen(string))
        !            41:        {
        !            42:                error(inst.thing.linno, 55); /* OUT OF STRING RANGE */
        !            43:        }
        !            44: 
        !            45:        return(result);
        !            46: }

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