GSI Object Oriented Online Offline (Go4) GO4-6.4.0
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f_swaplw.c
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1// $Id$
2//-----------------------------------------------------------------------
3// The GSI Online Offline Object Oriented (Go4) Project
4// Experiment Data Processing at EE department, GSI
5//-----------------------------------------------------------------------
6// Copyright (C) 2000- GSI Helmholtzzentrum fuer Schwerionenforschung GmbH
7// Planckstr. 1, 64291 Darmstadt, Germany
8// Contact: http://go4.gsi.de
9//-----------------------------------------------------------------------
10// This software can be used under the license agreements as stated
11// in Go4License.txt file which is part of the distribution.
12//-----------------------------------------------------------------------
13
14#include "typedefs.h"
15#define DEBUG 0
16/*2+F_SWAPLW****+******************************************************/
17/* */
18/*+ Module : F_SWAPLW */
19/* */
20/* */
21/*--------------------------------------------------------------------*/
22/*+ CALLING : sts = f_swaplw(pp_source, */
23/* l_len, */
24/* pp_dest) */
25/* */
26/*--------------------------------------------------------------------*/
27/* */
28/*+ PURPOSE : Long word byte swap. */
29/* */
30/*+ ARGUMENTS : */
31/*+ pp_source : Pointer to source. */
32/*+ l_dest : length (in long words) */
33/*+ pp_dest : Pointer to destination or 0 if */
34/* destination = source. */
35/* */
36/*+ FUNCTION : Long word byte swap. Works on the source field if */
37/* pp_dest points to value 0 or swaps from the source */
38/* to the destination field. */
39/* (Should be replaced by a fast assembler routine) */
40/* */
41/*+ Return type : int (see s_errnum_def.h) */
42/*+ Status codes: bit 0: success */
43/* */
44/*+ Initialize : - */
45/*+ Include name: - */
46/* */
47/*3+Implementation************+****************************************/
48/* */
49/*+ File name : PC_PROC.C */
50/*+ Version : 1.01 */
51/*+ Author : R.S. Mayer */
52/*+ Last Update : 27-Apr-1994 */
53/*+ Object libr.: ? */
54/*3+Updates*******+***********+****************************************/
55/* */
56/*+ Updates : Date Purpose */
57/* */
58/*3+Description***+***********+****************************************/
59/*1- C Procedure ***********+******************************************/
60#include <stdio.h>
61#include <stdlib.h>
62#include <string.h>
63#include <errno.h>
64
65/* function prototypes */
66
67/* defines */
68
69int f_swaplw(int *pp_source, int l_len, int *pp_dest)
70
71{
72 unsigned char *p_source, *p_dest, *p_s, *p_d;
73 unsigned int lu_save;
74
75 /* +++ action +++ */
76 p_source = (unsigned char *) pp_source;
77 p_dest = (unsigned char *) pp_dest;
78
79 if (p_dest == NULL)
80 {
81 /* source == destination */
82 for (p_d = (unsigned char *) p_source,
83 p_s = (unsigned char *) &lu_save;
84 p_d < p_source + (l_len * 4);
85 )
86 {
87 lu_save = *( (int *) p_d);
88 p_s += 4; /* increment source */
89 *(p_d++) = *(--p_s);
90 *(p_d++) = *(--p_s);
91 *(p_d++) = *(--p_s);
92 *(p_d++) = *(--p_s);
93 }
94 }
95 else
96 {
97 for (p_s = (unsigned char *) p_source,
98 p_d = (unsigned char *) p_dest;
99 p_s < p_source + (l_len * 4);
100 p_s += 4)
101 {
102 p_s += 4; /* increment source */
103 *(p_d++) = *(--p_s);
104 *(p_d++) = *(--p_s);
105 *(p_d++) = *(--p_s);
106 *(p_d++) = *(--p_s);
107 }
108
109 } /* dest == 0 */
110
111 return(0);
112}
113
f_swaplw
int f_swaplw(int *pp_source, int l_len, int *pp_dest)
Definition f_swaplw.c:69
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