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Annotation of gforth/libltdl/lt__strl.c, revision 1.1

1.1     ! anton       1: /* lt__strl.c -- size-bounded string copying and concatenation
        !             2: 
        !             3:    Copyright (C) 2004 Free Software Foundation, Inc.
        !             4:    Written by Bob Friesenhahn, 2004
        !             5: 
        !             6:    NOTE: The canonical source of this file is maintained with the
        !             7:    GNU Libtool package.  Report bugs to bug-libtool@gnu.org.
        !             8: 
        !             9: GNU Libltdl is free software; you can redistribute it and/or
        !            10: modify it under the terms of the GNU Lesser General Public
        !            11: License as published by the Free Software Foundation; either
        !            12: version 2 of the License, or (at your option) any later version.
        !            13: 
        !            14: As a special exception to the GNU Lesser General Public License,
        !            15: if you distribute this file as part of a program or library that
        !            16: is built using GNU Libtool, you may include this file under the
        !            17: same distribution terms that you use for the rest of that program.
        !            18: 
        !            19: GNU Libltdl is distributed in the hope that it will be useful,
        !            20: but WITHOUT ANY WARRANTY; without even the implied warranty of
        !            21: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        !            22: GNU Lesser General Public License for more details.
        !            23: 
        !            24: You should have received a copy of the GNU Lesser General Public
        !            25: License along with GNU Libltdl; see the file COPYING.LIB.  If not, a
        !            26: copy can be downloaded from  http://www.gnu.org/licenses/lgpl.html,
        !            27: or obtained by writing to the Free Software Foundation, Inc.,
        !            28: 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
        !            29: */
        !            30: 
        !            31: #include <assert.h>
        !            32: #include <string.h>
        !            33: 
        !            34: #include "lt__strl.h"
        !            35: 
        !            36: /*
        !            37:  lt_strlcat appends the NULL-terminated string src to the end of dst.
        !            38:  It will append at most dstsize - strlen(dst) - 1 bytes,
        !            39:  NULL-terminating the result. The total length of the string which
        !            40:  would have been created given sufficient buffer size (may be longer
        !            41:  than dstsize) is returned.  This function substitutes for strlcat()
        !            42:  which is available under NetBSD, FreeBSD and Solaris 9.
        !            43: 
        !            44:  Buffer overflow can be checked as follows:
        !            45: 
        !            46:    if (lt_strlcat(dst, src, dstsize) >= dstsize)
        !            47:      return -1;
        !            48: */
        !            49: #if !defined(HAVE_STRLCAT)
        !            50: size_t
        !            51: lt_strlcat(char *dst, const char *src, const size_t dstsize)
        !            52: {
        !            53:   size_t length;
        !            54:   char *p;
        !            55:   const char *q;
        !            56: 
        !            57:   assert(dst != NULL);
        !            58:   assert(src != (const char *) NULL);
        !            59:   assert(dstsize >= 1);
        !            60: 
        !            61:   length=strlen(dst);
        !            62: 
        !            63:   /*
        !            64:     Copy remaining characters from src while constraining length to
        !            65:     size - 1.
        !            66:   */
        !            67:   for ( p = dst + length, q = src;
        !            68:         (*q != 0) && (length < dstsize - 1) ;
        !            69:         length++, p++, q++ )
        !            70:     *p = *q;
        !            71: 
        !            72:   dst[length]='\0';
        !            73: 
        !            74:   /*
        !            75:     Add remaining length of src to length.
        !            76:   */
        !            77:   while (*q++)
        !            78:     length++;
        !            79: 
        !            80:   return length;
        !            81: }
        !            82: #endif /* !defined(HAVE_STRLCAT) */
        !            83: 
        !            84: /*
        !            85:   lt_strlcpy copies up to dstsize - 1 characters from the NULL-terminated
        !            86:   string src to dst, NULL-terminating the result. The total length of
        !            87:   the string which would have been created given sufficient buffer
        !            88:   size (may be longer than dstsize) is returned. This function
        !            89:   substitutes for strlcpy() which is available under OpenBSD, FreeBSD
        !            90:   and Solaris 9.
        !            91: 
        !            92:   Buffer overflow can be checked as  follows:
        !            93: 
        !            94:     if (lt_strlcpy(dst, src, dstsize) >= dstsize)
        !            95:       return -1;
        !            96: */
        !            97: #if !defined(HAVE_STRLCPY)
        !            98: size_t
        !            99: lt_strlcpy(char *dst, const char *src, const size_t dstsize)
        !           100: {
        !           101:   size_t length=0;
        !           102:   char *p;
        !           103:   const char *q;
        !           104: 
        !           105:   assert(dst != NULL);
        !           106:   assert(src != (const char *) NULL);
        !           107:   assert(dstsize >= 1);
        !           108: 
        !           109:   /*
        !           110:     Copy src to dst within bounds of size-1.
        !           111:   */
        !           112:   for ( p=dst, q=src, length=0 ;
        !           113:         (*q != 0) && (length < dstsize-1) ;
        !           114:         length++, p++, q++ )
        !           115:     *p = *q;
        !           116: 
        !           117:   dst[length]='\0';
        !           118: 
        !           119:   /*
        !           120:     Add remaining length of src to length.
        !           121:   */
        !           122:   while (*q++)
        !           123:     length++;
        !           124: 
        !           125:   return length;
        !           126: }
        !           127: #endif /* !defined(HAVE_STRLCPY) */