source: SVN/cambria/redboot/packages/language/c/libc/string/current/src/strcat.cxx @ 1

Last change on this file since 1 was 1, checked in by Tim Harvey, 2 years ago

restored latest version of files from server backup

Signed-off-by: Tim Harvey <tharvey@…>

File size: 4.3 KB
Line 
1//===========================================================================
2//
3//      strcat.cxx
4//
5//      ANSI standard strcat() routine
6//
7//===========================================================================
8//####ECOSGPLCOPYRIGHTBEGIN####
9// -------------------------------------------
10// This file is part of eCos, the Embedded Configurable Operating System.
11// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
12//
13// eCos is free software; you can redistribute it and/or modify it under
14// the terms of the GNU General Public License as published by the Free
15// Software Foundation; either version 2 or (at your option) any later version.
16//
17// eCos is distributed in the hope that it will be useful, but WITHOUT ANY
18// WARRANTY; without even the implied warranty of MERCHANTABILITY or
19// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
20// for more details.
21//
22// You should have received a copy of the GNU General Public License along
23// with eCos; if not, write to the Free Software Foundation, Inc.,
24// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
25//
26// As a special exception, if other files instantiate templates or use macros
27// or inline functions from this file, or you compile this file and link it
28// with other works to produce a work based on this file, this file does not
29// by itself cause the resulting work to be covered by the GNU General Public
30// License. However the source code for this file must still be made available
31// in accordance with section (3) of the GNU General Public License.
32//
33// This exception does not invalidate any other reasons why a work based on
34// this file might be covered by the GNU General Public License.
35//
36// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
37// at http://sources.redhat.com/ecos/ecos-license/
38// -------------------------------------------
39//####ECOSGPLCOPYRIGHTEND####
40//===========================================================================
41//#####DESCRIPTIONBEGIN####
42//
43// Author(s):     jlarmour
44// Contributors: 
45// Date:          2000-04-14
46// Purpose:     
47// Description:
48// Usage:       
49//
50//####DESCRIPTIONEND####
51//
52//===========================================================================
53
54// CONFIGURATION
55
56#include <pkgconf/libc_string.h>   // Configuration header
57
58// INCLUDES
59
60#include <cyg/infra/cyg_type.h>    // Common type definitions
61#include <cyg/infra/cyg_trac.h>    // Tracing support
62#include <cyg/infra/cyg_ass.h>     // Assertion support
63#include <string.h>                // Header for this file
64#include <stddef.h>           // Compiler definitions such as size_t, NULL etc.
65#include <cyg/libc/string/stringsupp.hxx> // Useful string function support and
66                                          // prototypes
67
68// EXPORTED SYMBOLS
69
70externC char *
71strcat( char *s1, const char *s2 ) CYGBLD_ATTRIB_WEAK_ALIAS(__strcat);
72
73// FUNCTIONS
74
75char *
76__strcat( char *s1, const char *s2 )
77{
78    CYG_REPORT_FUNCNAMETYPE( "__strcat", "returning %08x" );
79    CYG_REPORT_FUNCARG2( "s1=%08x, s2=%08x", s1, s2 );
80
81    CYG_CHECK_DATA_PTR( s1, "s1 is not a valid pointer!" );
82    CYG_CHECK_DATA_PTR( s2, "s2 is not a valid pointer!" );
83
84#if defined(CYGIMP_LIBC_STRING_PREFER_SMALL_TO_FAST) || defined(__OPTIMIZE_SIZE__)
85    char *s = s1;
86   
87    while (*s1)
88        s1++;
89   
90    while ((*s1++ = *s2++))
91        ;
92
93    CYG_REPORT_RETVAL( s );
94
95    return s;
96#else
97    char *s = s1;
98   
99   
100    // Skip over the data in s1 as quickly as possible.
101    if (!CYG_LIBC_STR_UNALIGNED (s1))
102    {
103        CYG_WORD *aligned_s1 = (CYG_WORD *)s1;
104        while (!CYG_LIBC_STR_DETECTNULL (*aligned_s1))
105            aligned_s1++;
106       
107        s1 = (char *)aligned_s1;
108    }
109   
110    while (*s1)
111        s1++;
112   
113    // s1 now points to the its trailing null character, we can
114    // just use strcpy to do the work for us now.
115    //
116    // ?!? We might want to just include strcpy here.
117    // Also, this will cause many more unaligned string copies because
118    // s1 is much less likely to be aligned.  I don't know if its worth
119    // tweaking strcpy to handle this better.
120    strcpy (s1, s2);
121   
122    CYG_REPORT_RETVAL( s );
123
124    return s;
125#endif // not defined(CYGIMP_LIBC_STRING_PREFER_SMALL_TO_FAST) ||
126       //     defined(__OPTIMIZE_SIZE__)
127} // __strcat()
128
129// EOF strcat.cxx
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