/* Random utility Lisp functions.
- Copyright (C) 1985-1987, 1993-1995, 1997-2012
- Free Software Foundation, Inc.
+
+Copyright (C) 1985-1987, 1993-1995, 1997-2013 Free Software Foundation, Inc.
This file is part of GNU Emacs.
#include <unistd.h>
#include <time.h>
-#include <setjmp.h>
#include <intprops.h>
DEFUN ("random", Frandom, Srandom, 0, 1, 0,
doc: /* Return a pseudo-random number.
-All integers representable in Lisp are equally likely.
- On most systems, this is 29 bits' worth.
+All integers representable in Lisp, i.e. between `most-negative-fixnum'
+and `most-positive-fixnum', inclusive, are equally likely.
+
With positive integer LIMIT, return random number in interval [0,LIMIT).
With argument t, set the random number seed from the current time and pid.
-Other values of LIMIT are ignored. */)
+With a string argument, set the seed based on the string's contents.
+Other values of LIMIT are ignored.
+
+See Info node `(elisp)Random Numbers' for more details. */)
(Lisp_Object limit)
{
EMACS_INT val;
DEFUN ("compare-strings", Fcompare_strings, Scompare_strings, 6, 7, 0,
doc: /* Compare the contents of two strings, converting to multibyte if needed.
-In string STR1, skip the first START1 characters and stop at END1.
-In string STR2, skip the first START2 characters and stop at END2.
-END1 and END2 default to the full lengths of the respective strings.
-
-Case is significant in this comparison if IGNORE-CASE is nil.
-Unibyte strings are converted to multibyte for comparison.
+The arguments START1, END1, START2, and END2, if non-nil, are
+positions specifying which parts of STR1 or STR2 to compare. In
+string STR1, compare the part between START1 (inclusive) and END1
+\(exclusive). If START1 is nil, it defaults to 0, the beginning of
+the string; if END1 is nil, it defaults to the length of the string.
+Likewise, in string STR2, compare the part between START2 and END2.
+
+The strings are compared by the numeric values of their characters.
+For instance, STR1 is "less than" STR2 if its first differing
+character has a smaller numeric value. If IGNORE-CASE is non-nil,
+characters are converted to lower-case before comparing them. Unibyte
+strings are converted to multibyte for comparison.
The value is t if the strings (or specified portions) match.
If string STR1 is less, the value is a negative number N;
DEFUN ("nreverse", Fnreverse, Snreverse, 1, 1, 0,
doc: /* Reverse LIST by modifying cdr pointers.
-Return the reversed list. */)
+Return the reversed list. Expects a properly nil-terminated list. */)
(Lisp_Object list)
{
register Lisp_Object prev, tail, next;
while (!NILP (tail))
{
QUIT;
- CHECK_LIST_CONS (tail, list);
+ CHECK_LIST_CONS (tail, tail);
next = XCDR (tail);
Fsetcdr (tail, prev);
prev = tail;
halftail = XCDR (halftail);
if (EQ (tail, halftail))
break;
-
-#if 0 /* Unsafe version. */
- /* This function can be called asynchronously
- (setup_coding_system). Don't QUIT in that case. */
- if (!interrupt_input_blocked)
- QUIT;
-#endif
}
return Qnil;
Lisp_Object QCtest, QCsize, QCrehash_size, QCrehash_threshold, QCweakness;
static Lisp_Object Qhash_table_test, Qkey_or_value, Qkey_and_value;
-/* Function prototypes. */
-
-static struct Lisp_Hash_Table *check_hash_table (Lisp_Object);
-static ptrdiff_t get_key_arg (Lisp_Object, ptrdiff_t, Lisp_Object *, char *);
-static void maybe_resize_hash_table (struct Lisp_Hash_Table *);
-static bool sweep_weak_table (struct Lisp_Hash_Table *, bool);
-
-
\f
/***********************************************************************
Utilities
h2 = allocate_hash_table ();
next = h2->header.next.vector;
- memcpy (h2, h1, sizeof *h2);
+ *h2 = *h1;
h2->header.next.vector = next;
h2->key_and_value = Fcopy_sequence (h1->key_and_value);
h2->hash = Fcopy_sequence (h1->hash);
/* Resize hash table H if it's too full. If H cannot be resized
because it's already too large, throw an error. */
-static inline void
+static void
maybe_resize_hash_table (struct Lisp_Hash_Table *h)
{
if (NILP (h->next_free))