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-rw-r--r--lib/array-mergesort.h302
1 files changed, 151 insertions, 151 deletions
diff --git a/lib/array-mergesort.h b/lib/array-mergesort.h
index 3988d28..61bf728 100644
--- a/lib/array-mergesort.h
+++ b/lib/array-mergesort.h
@@ -1,5 +1,5 @@
/* Stable-sorting of an array using mergesort.
- Copyright (C) 2009 Free Software Foundation, Inc.
+ Copyright (C) 2009, 2010 Free Software Foundation, Inc.
Written by Bruno Haible <bruno@clisp.org>, 2009.
This program is free software: you can redistribute it and/or modify it
@@ -47,40 +47,40 @@ merge (const ELEMENT *src1, size_t n1,
for (;;) /* while (n1 > 0 && n2 > 0) */
{
if (COMPARE (src1, src2) <= 0)
- {
- *dst++ = *src1++;
- n1--;
- if (n1 == 0)
- break;
- }
+ {
+ *dst++ = *src1++;
+ n1--;
+ if (n1 == 0)
+ break;
+ }
else
- {
- *dst++ = *src2++;
- n2--;
- if (n2 == 0)
- break;
- }
+ {
+ *dst++ = *src2++;
+ n2--;
+ if (n2 == 0)
+ break;
+ }
}
/* Here n1 == 0 || n2 == 0 but also n1 > 0 || n2 > 0. */
if (n1 > 0)
{
if (dst != src1)
- do
- {
- *dst++ = *src1++;
- n1--;
- }
- while (n1 > 0);
+ do
+ {
+ *dst++ = *src1++;
+ n1--;
+ }
+ while (n1 > 0);
}
else /* n2 > 0 */
{
if (dst != src2)
- do
- {
- *dst++ = *src2++;
- n2--;
- }
- while (n2 > 0);
+ do
+ {
+ *dst++ = *src2++;
+ n2--;
+ }
+ while (n2 > 0);
}
}
@@ -101,79 +101,79 @@ merge_sort_fromto (const ELEMENT *src, ELEMENT *dst, size_t n, ELEMENT *tmp)
case 2:
/* Trivial case. */
if (COMPARE (&src[0], &src[1]) <= 0)
- {
- /* src[0] <= src[1] */
- dst[0] = src[0];
- dst[1] = src[1];
- }
+ {
+ /* src[0] <= src[1] */
+ dst[0] = src[0];
+ dst[1] = src[1];
+ }
else
- {
- dst[0] = src[1];
- dst[1] = src[0];
- }
+ {
+ dst[0] = src[1];
+ dst[1] = src[0];
+ }
break;
case 3:
/* Simple case. */
if (COMPARE (&src[0], &src[1]) <= 0)
- {
- if (COMPARE (&src[1], &src[2]) <= 0)
- {
- /* src[0] <= src[1] <= src[2] */
- dst[0] = src[0];
- dst[1] = src[1];
- dst[2] = src[2];
- }
- else if (COMPARE (&src[0], &src[2]) <= 0)
- {
- /* src[0] <= src[2] < src[1] */
- dst[0] = src[0];
- dst[1] = src[2];
- dst[2] = src[1];
- }
- else
- {
- /* src[2] < src[0] <= src[1] */
- dst[0] = src[2];
- dst[1] = src[0];
- dst[2] = src[1];
- }
- }
+ {
+ if (COMPARE (&src[1], &src[2]) <= 0)
+ {
+ /* src[0] <= src[1] <= src[2] */
+ dst[0] = src[0];
+ dst[1] = src[1];
+ dst[2] = src[2];
+ }
+ else if (COMPARE (&src[0], &src[2]) <= 0)
+ {
+ /* src[0] <= src[2] < src[1] */
+ dst[0] = src[0];
+ dst[1] = src[2];
+ dst[2] = src[1];
+ }
+ else
+ {
+ /* src[2] < src[0] <= src[1] */
+ dst[0] = src[2];
+ dst[1] = src[0];
+ dst[2] = src[1];
+ }
+ }
else
- {
- if (COMPARE (&src[0], &src[2]) <= 0)
- {
- /* src[1] < src[0] <= src[2] */
- dst[0] = src[1];
- dst[1] = src[0];
- dst[2] = src[2];
- }
- else if (COMPARE (&src[1], &src[2]) <= 0)
- {
- /* src[1] <= src[2] < src[0] */
- dst[0] = src[1];
- dst[1] = src[2];
- dst[2] = src[0];
- }
- else
- {
- /* src[2] < src[1] < src[0] */
- dst[0] = src[2];
- dst[1] = src[1];
- dst[2] = src[0];
- }
- }
+ {
+ if (COMPARE (&src[0], &src[2]) <= 0)
+ {
+ /* src[1] < src[0] <= src[2] */
+ dst[0] = src[1];
+ dst[1] = src[0];
+ dst[2] = src[2];
+ }
+ else if (COMPARE (&src[1], &src[2]) <= 0)
+ {
+ /* src[1] <= src[2] < src[0] */
+ dst[0] = src[1];
+ dst[1] = src[2];
+ dst[2] = src[0];
+ }
+ else
+ {
+ /* src[2] < src[1] < src[0] */
+ dst[0] = src[2];
+ dst[1] = src[1];
+ dst[2] = src[0];
+ }
+ }
break;
default:
{
- size_t n1 = n / 2;
- size_t n2 = (n + 1) / 2;
- /* Note: n1 + n2 = n, n1 <= n2. */
- /* Sort src[n1..n-1] into dst[n1..n-1], scratching tmp[0..n2/2-1]. */
- merge_sort_fromto (src + n1, dst + n1, n2, tmp);
- /* Sort src[0..n1-1] into tmp[0..n1-1], scratching dst[0..n1-1]. */
- merge_sort_fromto (src, tmp, n1, dst);
- /* Merge the two half results. */
- merge (tmp, n1, dst + n1, n2, dst);
+ size_t n1 = n / 2;
+ size_t n2 = (n + 1) / 2;
+ /* Note: n1 + n2 = n, n1 <= n2. */
+ /* Sort src[n1..n-1] into dst[n1..n-1], scratching tmp[0..n2/2-1]. */
+ merge_sort_fromto (src + n1, dst + n1, n2, tmp);
+ /* Sort src[0..n1-1] into tmp[0..n1-1], scratching dst[0..n1-1]. */
+ merge_sort_fromto (src, tmp, n1, dst);
+ /* Merge the two half results. */
+ merge (tmp, n1, dst + n1, n2, dst);
}
break;
}
@@ -193,77 +193,77 @@ merge_sort_inplace (ELEMENT *src, size_t n, ELEMENT *tmp)
case 2:
/* Trivial case. */
if (COMPARE (&src[0], &src[1]) <= 0)
- {
- /* src[0] <= src[1] */
- }
+ {
+ /* src[0] <= src[1] */
+ }
else
- {
- ELEMENT t = src[0];
- src[0] = src[1];
- src[1] = t;
- }
+ {
+ ELEMENT t = src[0];
+ src[0] = src[1];
+ src[1] = t;
+ }
break;
case 3:
/* Simple case. */
if (COMPARE (&src[0], &src[1]) <= 0)
- {
- if (COMPARE (&src[1], &src[2]) <= 0)
- {
- /* src[0] <= src[1] <= src[2] */
- }
- else if (COMPARE (&src[0], &src[2]) <= 0)
- {
- /* src[0] <= src[2] < src[1] */
- ELEMENT t = src[1];
- src[1] = src[2];
- src[2] = t;
- }
- else
- {
- /* src[2] < src[0] <= src[1] */
- ELEMENT t = src[0];
- src[0] = src[2];
- src[2] = src[1];
- src[1] = t;
- }
- }
+ {
+ if (COMPARE (&src[1], &src[2]) <= 0)
+ {
+ /* src[0] <= src[1] <= src[2] */
+ }
+ else if (COMPARE (&src[0], &src[2]) <= 0)
+ {
+ /* src[0] <= src[2] < src[1] */
+ ELEMENT t = src[1];
+ src[1] = src[2];
+ src[2] = t;
+ }
+ else
+ {
+ /* src[2] < src[0] <= src[1] */
+ ELEMENT t = src[0];
+ src[0] = src[2];
+ src[2] = src[1];
+ src[1] = t;
+ }
+ }
else
- {
- if (COMPARE (&src[0], &src[2]) <= 0)
- {
- /* src[1] < src[0] <= src[2] */
- ELEMENT t = src[0];
- src[0] = src[1];
- src[1] = t;
- }
- else if (COMPARE (&src[1], &src[2]) <= 0)
- {
- /* src[1] <= src[2] < src[0] */
- ELEMENT t = src[0];
- src[0] = src[1];
- src[1] = src[2];
- src[2] = t;
- }
- else
- {
- /* src[2] < src[1] < src[0] */
- ELEMENT t = src[0];
- src[0] = src[2];
- src[2] = t;
- }
- }
+ {
+ if (COMPARE (&src[0], &src[2]) <= 0)
+ {
+ /* src[1] < src[0] <= src[2] */
+ ELEMENT t = src[0];
+ src[0] = src[1];
+ src[1] = t;
+ }
+ else if (COMPARE (&src[1], &src[2]) <= 0)
+ {
+ /* src[1] <= src[2] < src[0] */
+ ELEMENT t = src[0];
+ src[0] = src[1];
+ src[1] = src[2];
+ src[2] = t;
+ }
+ else
+ {
+ /* src[2] < src[1] < src[0] */
+ ELEMENT t = src[0];
+ src[0] = src[2];
+ src[2] = t;
+ }
+ }
break;
default:
{
- size_t n1 = n / 2;
- size_t n2 = (n + 1) / 2;
- /* Note: n1 + n2 = n, n1 <= n2. */
- /* Sort src[n1..n-1], scratching tmp[0..n2-1]. */
- merge_sort_inplace (src + n1, n2, tmp);
- /* Sort src[0..n1-1] into tmp[0..n1-1], scratching tmp[n1..2*n1-1]. */
- merge_sort_fromto (src, tmp, n1, tmp + n1);
- /* Merge the two half results. */
- merge (tmp, n1, src + n1, n2, src);
+ size_t n1 = n / 2;
+ size_t n2 = (n + 1) / 2;
+ /* Note: n1 + n2 = n, n1 <= n2. */
+ /* Sort src[n1..n-1], scratching tmp[0..n2-1]. */
+ merge_sort_inplace (src + n1, n2, tmp);
+ /* Sort src[0..n1-1] into tmp[0..n1-1], scratching tmp[n1..2*n1-1]. */
+ merge_sort_fromto (src, tmp, n1, tmp + n1);
+ /* Merge the two half results. */
+ merge (tmp, n1, src + n1, n2, src);
}
break;
}
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