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Annotation of researchv10no/cmd/sml/src/runtime/objects.c, revision 1.1

1.1     ! root        1: /* Copyright 1989 by AT&T Bell Laboratories */
        !             2: #include "tags.h"
        !             3: #include "descriptor.h"
        !             4: 
        !             5: /* NOTE: all these functions use c_alloc, and modify saved_dataptr. */
        !             6: 
        !             7: extern int saved_dataptr;
        !             8: 
        !             9: int *c_alloc(siz) int siz;
        !            10: {int *s=(int *)saved_dataptr;
        !            11:  saved_dataptr+= 4*siz;
        !            12:  return s;
        !            13: }
        !            14: 
        !            15: /* Make a C string into an ML string.  Used by restartFn (through
        !            16:    mak_str_lst()).
        !            17: */
        !            18: mak_str(s)
        !            19: char *s;
        !            20: {int len = strlen(s);
        !            21:  if (len == 1) return(mak_int(*(char *)s));
        !            22:  else {int i = (len+3)>>2;
        !            23:        int *p = 1 + c_alloc(i+1);
        !            24:        p[i-1] = 0; /* allocate */
        !            25:        p[-1] = (len<<width_tags) + tag_string;
        !            26:        strncpy(p,s,len);
        !            27:        return((int)p);
        !            28:  }
        !            29: }
        !            30: 
        !            31: /* Make an ML string into a C string */
        !            32: char *
        !            33: get_str(x)
        !            34: int x;
        !            35: {
        !            36:  if (is_ptr(x)) return((char *)x);
        !            37:  else {char *s = (char *)c_alloc(1); *(int *)s = 0; *s = x; return s;}
        !            38: }
        !            39: 
        !            40: /* No good for strings/bytearrays (allocates by word, not byte).
        !            41:    Also a dangerous, as the last word should be allocated first for
        !            42:    garbage collector safety.  Only used in bootup (run.c) and restartFn
        !            43:    (through mak_str_lst()). */
        !            44: mak_obj(l,t)
        !            45: int l,t;
        !            46: {int *p = 1 + c_alloc(l+1);
        !            47:  p[-1] = mak_desc(l,t);
        !            48:  return((int)p);
        !            49: }
        !            50: 
        !            51: /* Take a vector of strings (like argv) and turn it into an ML string list.
        !            52:    Uses mak_obj, so it is unsafe and should be used with caution.  Only
        !            53:    restartFn uses it for now. */
        !            54: int *
        !            55: mak_str_lst(sl)
        !            56: char **sl;
        !            57: {
        !            58:  int *list;
        !            59:  if (!(*sl)) return ((int *)ML_NIL);
        !            60:  list = (int *)mak_obj(2,tag_record);
        !            61:  list[1] = (int)mak_str_lst(sl+1);
        !            62:  list[0] = mak_str(*sl);
        !            63:  return list;
        !            64: }
        !            65: 
        !            66: ml_eqstr(a,b) int *a, *b;
        !            67: {int alen=a[-1]>>4, blen = b[-1]>>4; int i;
        !            68:  if (alen != blen) return 0;
        !            69:  for(i=0; i*4<alen; i++) if (a[i]!=b[i]) return 0;
        !            70:  return 1;
        !            71: }
        !            72: 

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