4.3BSD - /usr/src/new/icon/rt/strprc.c

   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

Defined functions

Defined variables