237 lines
6 KiB
C
237 lines
6 KiB
C
/*************************************************
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* Perl-Compatible Regular Expressions *
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*************************************************/
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/* PCRE is a library of functions to support regular expressions whose syntax
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and semantics are as close as possible to those of the Perl 5 language.
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Written by Philip Hazel
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Original API code Copyright (c) 1997-2012 University of Cambridge
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New API code Copyright (c) 2018 University of Cambridge
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-----------------------------------------------------------------------------
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the name of the University of Cambridge nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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-----------------------------------------------------------------------------
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*/
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/* This module contains internal functions for comparing and finding the length
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of strings. These are used instead of strcmp() etc because the standard
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functions work only on 8-bit data. */
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "pcre2_internal.h"
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/*************************************************
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* Emulated memmove() for systems without it *
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*************************************************/
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/* This function can make use of bcopy() if it is available. Otherwise do it by
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steam, as there some non-Unix environments that lack both memmove() and
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bcopy(). */
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#if !defined(VPCOMPAT) && !defined(HAVE_MEMMOVE)
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void *
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PRIV(memmove)(void *d, const void *s, size_t n)
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{
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#ifdef HAVE_BCOPY
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bcopy(s, d, n);
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return d;
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#else
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size_t i;
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unsigned char *dest = (unsigned char *)d;
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const unsigned char *src = (const unsigned char *)s;
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if (dest > src)
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{
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dest += n;
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src += n;
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for (i = 0; i < n; ++i) *(--dest) = *(--src);
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return (void *)dest;
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}
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else
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{
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for (i = 0; i < n; ++i) *dest++ = *src++;
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return (void *)(dest - n);
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}
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#endif /* not HAVE_BCOPY */
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}
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#endif /* not VPCOMPAT && not HAVE_MEMMOVE */
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/*************************************************
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* Compare two zero-terminated PCRE2 strings *
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*************************************************/
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/*
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Arguments:
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str1 first string
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str2 second string
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Returns: 0, 1, or -1
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*/
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int
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PRIV(strcmp)(PCRE2_SPTR str1, PCRE2_SPTR str2)
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{
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PCRE2_UCHAR c1, c2;
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while (*str1 != '\0' || *str2 != '\0')
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{
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c1 = *str1++;
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c2 = *str2++;
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if (c1 != c2) return ((c1 > c2) << 1) - 1;
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}
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return 0;
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}
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/*************************************************
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* Compare zero-terminated PCRE2 & 8-bit strings *
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*************************************************/
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/* As the 8-bit string is almost always a literal, its type is specified as
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const char *.
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Arguments:
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str1 first string
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str2 second string
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Returns: 0, 1, or -1
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*/
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int
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PRIV(strcmp_c8)(PCRE2_SPTR str1, const char *str2)
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{
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PCRE2_UCHAR c1, c2;
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while (*str1 != '\0' || *str2 != '\0')
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{
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c1 = *str1++;
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c2 = *str2++;
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if (c1 != c2) return ((c1 > c2) << 1) - 1;
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}
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return 0;
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}
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/*************************************************
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* Compare two PCRE2 strings, given a length *
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*************************************************/
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/*
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Arguments:
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str1 first string
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str2 second string
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len the length
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Returns: 0, 1, or -1
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*/
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int
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PRIV(strncmp)(PCRE2_SPTR str1, PCRE2_SPTR str2, size_t len)
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{
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PCRE2_UCHAR c1, c2;
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for (; len > 0; len--)
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{
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c1 = *str1++;
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c2 = *str2++;
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if (c1 != c2) return ((c1 > c2) << 1) - 1;
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}
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return 0;
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}
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/*************************************************
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* Compare PCRE2 string to 8-bit string by length *
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*************************************************/
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/* As the 8-bit string is almost always a literal, its type is specified as
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const char *.
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Arguments:
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str1 first string
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str2 second string
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len the length
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Returns: 0, 1, or -1
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*/
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int
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PRIV(strncmp_c8)(PCRE2_SPTR str1, const char *str2, size_t len)
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{
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PCRE2_UCHAR c1, c2;
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for (; len > 0; len--)
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{
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c1 = *str1++;
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c2 = *str2++;
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if (c1 != c2) return ((c1 > c2) << 1) - 1;
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}
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return 0;
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}
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/*************************************************
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* Find the length of a PCRE2 string *
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*************************************************/
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/*
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Argument: the string
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Returns: the length
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*/
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PCRE2_SIZE
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PRIV(strlen)(PCRE2_SPTR str)
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{
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PCRE2_SIZE c = 0;
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while (*str++ != 0) c++;
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return c;
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}
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/*************************************************
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* Copy 8-bit 0-terminated string to PCRE2 string *
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*************************************************/
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/* Arguments:
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str1 buffer to receive the string
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str2 8-bit string to be copied
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Returns: the number of code units used (excluding trailing zero)
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*/
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PCRE2_SIZE
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PRIV(strcpy_c8)(PCRE2_UCHAR *str1, const char *str2)
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{
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PCRE2_UCHAR *t = str1;
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while (*str2 != 0) *t++ = *str2++;
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*t = 0;
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return t - str1;
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}
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/* End of pcre2_string_utils.c */
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