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/*
* Copyright (c) 2003 David Roundy
* Copyright (c) 2005-6 Don Stewart
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the names of the authors or the names of any contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "fpstring.h"
/* copy a string in reverse */
void fps_reverse(unsigned char *q, unsigned char *p, unsigned long n) {
p += n-1;
while (n-- != 0)
*q++ = *p--;
}
/* duplicate a string, interspersing the character through the elements
of the duplicated string */
void fps_intersperse(unsigned char *q,
unsigned char *p,
unsigned long n,
unsigned char c) {
while (n > 1) {
*q++ = *p++;
*q++ = c;
n--;
}
if (n == 1)
*q = *p;
}
/* find maximum char in a packed string */
unsigned char fps_maximum(unsigned char *p, unsigned long len) {
unsigned char *q, c = *p;
for (q = p; q < p + len; q++)
if (*q > c)
c = *q;
return c;
}
/* find minimum char in a packed string */
unsigned char fps_minimum(unsigned char *p, unsigned long len) {
unsigned char *q, c = *p;
for (q = p; q < p + len; q++)
if (*q < c)
c = *q;
return c;
}
/* count the number of occurences of a char in a string */
unsigned long fps_count(unsigned char *p, unsigned long len, unsigned char w) {
unsigned long c;
for (c = 0; len-- != 0; ++p)
if (*p == w)
++c;
return c;
}
/* This wrapper is here so that we can copy a sub-range of a ByteArray#.
We cannot construct a pointer to the interior of an unpinned ByteArray#,
except by doing an unsafe ffi call, and adjusting the pointer C-side. */
void * fps_memcpy_offsets(void *dst, unsigned long dst_off,
const void *src, unsigned long src_off, size_t n) {
return memcpy(dst + dst_off, src + src_off, n);
}
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