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Annotation of 43BSD/contrib/icon/link/builtin.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Routines for determining if a name is a built-in function.
        !             3:  */
        !             4: 
        !             5: #include "ilink.h"
        !             6: 
        !             7: /*
        !             8:  * btable is an array of the names of the Icon builtin functions.
        !             9:  */
        !            10: char *btable[] = {
        !            11: #define PDEF(p) "p",
        !            12: #include "../h/pdef.h"
        !            13: #undef PDEF
        !            14:    };
        !            15: 
        !            16: #define NBUILTIN (sizeof(btable)/sizeof(char *)) 
        !            17: 
        !            18: /*
        !            19:  * blocate - binary search for a builtin function.
        !            20:  * If found, returns pointer to entry.
        !            21:  */
        !            22: 
        !            23: blocate(s)
        !            24: register char *s;
        !            25:    {
        !            26:    register int test, cmp;
        !            27:    int low, high;
        !            28: 
        !            29:    low = 0;
        !            30:    high = NBUILTIN;
        !            31:    do {
        !            32:       test = (low + high) / 2;
        !            33:       cmp = strcmp(btable[test], s);
        !            34:       if (cmp < 0)
        !            35:          low = test + 1;
        !            36:       else if (cmp > 0)
        !            37:          high = test;
        !            38:       else
        !            39:          return (test+1);
        !            40:       } while (low < high);
        !            41:    return (0);
        !            42:    }

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