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Annotation of 43BSD/contrib/icon/rt/strprc.c, revision 1.1

1.1     ! root        1: #include <ctype.h>
        !             2: #include "../h/rt.h"
        !             3: #ifdef XPX
        !             4: #include "../h/pnames.h"
        !             5: /*
        !             6:  * strprc - Convert the qualified string named by *d into a procedure
        !             7:  *  descriptor if possible.  n is the number of arguments that the desired
        !             8:  *  procedure has.  n is only used when the name of the procedure is
        !             9:  *  non-alphabetic (hence, an operator).
        !            10:  *  A return value of 1 indicates successful conversion.
        !            11:  *  0 indicates that the string could not be converted.
        !            12:  */
        !            13: strprc(d,n)
        !            14: struct descrip *d;
        !            15: int n;
        !            16:    {
        !            17:       extern struct descrip *gnames, *globals, *eglobals;
        !            18:       struct descrip *np, *gp;
        !            19:       struct pstrnm *p;
        !            20:       char *s;
        !            21:       int ns, l;
        !            22:       
        !            23:       /*
        !            24:        * Look in global name list first.
        !            25:        */
        !            26:       np = gnames; gp = globals;
        !            27:       while (gp < eglobals) {
        !            28:          if (!lexcmp(np++,d))
        !            29:             if (BLKLOC(*gp)->proc.type == T_PROC) {
        !            30:                STRLEN(*d) = D_PROC; /* really type field */
        !            31:                BLKLOC(*d) = BLKLOC(*gp);
        !            32:                return 1;
        !            33:                }
        !            34:          gp++;
        !            35:          }
        !            36:       /*
        !            37:        * The name is not a global, see if it is a builtin or an operator.
        !            38:        */
        !            39:       s = STRLOC(*d);
        !            40:       l = STRLEN(*d);
        !            41:       for (p = pntab; p->pstrep; p++)
        !            42:          /*
        !            43:           * Compare the desired name with each standard procedure/operator
        !            44:           *  name.
        !            45:           */
        !            46:          if (!slcmp(s,l,p->pstrep)) {
        !            47:             if (isalpha(*s)) {
        !            48:                /*
        !            49:                 * The names are the same and s starts with an alphabetic,
        !            50:                 *  so it's the one being looked for; return it.
        !            51:                 */
        !            52:                STRLEN(*d) = D_PROC;
        !            53:                BLKLOC(*d) = (union block *) p->pblock;
        !            54:                return 1;
        !            55:                }
        !            56:             if ((ns = p->pblock->nstatic) < 0)
        !            57:                ns = -ns;
        !            58:             else
        !            59:                ns = p->pblock->nparam;
        !            60:             if (n == ns) {
        !            61:                STRLEN(*d) = D_PROC; /* really type field */
        !            62:                BLKLOC(*d) = (union block *) p->pblock;
        !            63:                return 1;
        !            64:                }
        !            65:             }
        !            66:       return 0;
        !            67:    }
        !            68: 
        !            69: /*
        !            70:  * slcmp - lexically compare l1 bytes of s1 with null-terminated s2.
        !            71:  */
        !            72: 
        !            73: slcmp(s1, l1, s2)
        !            74: int l1;
        !            75: char *s1,*s2;
        !            76:    {
        !            77:    register int minlen;
        !            78:    int l2;
        !            79: 
        !            80:    l2 = strlen(s2);
        !            81: 
        !            82:    minlen = (l1 <= l2) ? l1 : l2;
        !            83: 
        !            84:    while (minlen--)
        !            85:       if (*s1++ != *s2++)
        !            86:          return ((*--s1 & 0377) - (*--s2 & 0377));
        !            87: 
        !            88:    return (l1 - l2);
        !            89:    }
        !            90: #else XPX
        !            91: char junk;     /* prevent null object module */
        !            92: #endif XPX

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