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//=========================================================================== // // strncpy.cxx // // ISO C standard strncpy() routine // //=========================================================================== //####ECOSGPLCOPYRIGHTBEGIN#### // ------------------------------------------- // This file is part of eCos, the Embedded Configurable Operating System. // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc. // // eCos is free software; you can redistribute it and/or modify it under // the terms of the GNU General Public License as published by the Free // Software Foundation; either version 2 or (at your option) any later version. // // eCos is distributed in the hope that it will be useful, but WITHOUT ANY // WARRANTY; without even the implied warranty of MERCHANTABILITY or // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License // for more details. // // You should have received a copy of the GNU General Public License along // with eCos; if not, write to the Free Software Foundation, Inc., // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. // // As a special exception, if other files instantiate templates or use macros // or inline functions from this file, or you compile this file and link it // with other works to produce a work based on this file, this file does not // by itself cause the resulting work to be covered by the GNU General Public // License. However the source code for this file must still be made available // in accordance with section (3) of the GNU General Public License. // // This exception does not invalidate any other reasons why a work based on // this file might be covered by the GNU General Public License. // // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc. // at http://sources.redhat.com/ecos/ecos-license/ // ------------------------------------------- //####ECOSGPLCOPYRIGHTEND#### //=========================================================================== //#####DESCRIPTIONBEGIN#### // // Author(s): jlarmour // Contributors: // Date: 2000-04-14 // Purpose: // Description: // Usage: // //####DESCRIPTIONEND#### // //=========================================================================== // CONFIGURATION #include <pkgconf/libc_string.h> // Configuration header // INCLUDES #include <cyg/infra/cyg_type.h> // Common type definitions #include <cyg/infra/cyg_trac.h> // Tracing support #include <cyg/infra/cyg_ass.h> // Assertion support #include <string.h> // Header for this file #include <stddef.h> // Compiler definitions such as size_t, NULL etc. #include <cyg/libc/string/stringsupp.hxx> // Useful string function support and // prototypes // EXPORTED SYMBOLS externC char * strncpy( char *s1, const char *s2, size_t n ) \ CYGBLD_ATTRIB_WEAK_ALIAS(__strncpy); // FUNCTIONS char * __strncpy( char *s1, const char *s2, size_t n) { CYG_REPORT_FUNCNAMETYPE( "__strncpy", "returning %08x" ); CYG_REPORT_FUNCARG3( "s1=%08x, s2=%08x, n=%d", s1, s2, n ); if (n) { CYG_CHECK_DATA_PTR( s1, "s1 is not a valid pointer!" ); CYG_CHECK_DATA_PTR( s2, "s2 is not a valid pointer!" ); } #if defined(CYGIMP_LIBC_STRING_PREFER_SMALL_TO_FAST) || defined(__OPTIMIZE_SIZE__) char *dscan; const char *sscan; dscan = s1; sscan = s2; while (n > 0) { --n; if ((*dscan++ = *sscan++) == '\0') break; } while (n-- > 0) *dscan++ = '\0'; CYG_REPORT_RETVAL( s1 ); return s1; #else char *dst = s1; const char *src = s2; CYG_WORD *aligned_dst; const CYG_WORD *aligned_src; // If SRC and DEST is aligned and count large enough, then copy words. if (!CYG_LIBC_STR_UNALIGNED2 (src, dst) && !CYG_LIBC_STR_OPT_TOO_SMALL (n)) { aligned_dst = (CYG_WORD *)dst; aligned_src = (CYG_WORD *)src; // SRC and DEST are both "CYG_WORD" aligned, try to do "CYG_WORD" // sized copies. while (n >= sizeof (CYG_WORD) && !CYG_LIBC_STR_DETECTNULL(*aligned_src)) { n -= sizeof (CYG_WORD); *aligned_dst++ = *aligned_src++; } dst = (char *)aligned_dst; src = (const char *)aligned_src; } // if while (n > 0) { --n; if ((*dst++ = *src++) == '\0') break; } while (n-- > 0) *dst++ = '\0'; CYG_REPORT_RETVAL( s1 ); return s1; #endif // not defined(CYGIMP_LIBC_STRING_PREFER_SMALL_TO_FAST) || // defined(__OPTIMIZE_SIZE__) } // __strncpy() // EOF strncpy.cxx