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/*
* Mach Operating System
* Copyright (c) 1991 Carnegie Mellon University
* All Rights Reserved.
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie Mellon
* the rights to redistribute these changes.
*/
/*
* Character subroutines
*/
#include <varargs.h>
#define EXPORT_BOOLEAN
#include <mach/boolean.h>
/*
* Concatenate a group of strings together into a buffer.
* Return a pointer to the trailing '\0' character in
* the result string.
* The list of strings ends with a '(char *)0'.
*/
/*VARARGS1*/
char *
strbuild(dest, va_alist)
register char * dest;
va_dcl
{
va_list argptr;
register char * src;
register int c;
va_start(argptr);
while ((src = va_arg(argptr, char *)) != (char *)0) {
while ((c = *src++) != '\0')
*dest++ = c;
}
*dest = '\0';
return (dest);
}
/*
* Return TRUE if string 2 is a prefix of string 1.
*/
boolean_t
strprefix(s1, s2)
register char *s1, *s2;
{
register int c;
while ((c = *s2++) != '\0') {
if (c != *s1++)
return (FALSE);
}
return (TRUE);
}
/*
* ovbcopy - like bcopy, but recognizes overlapping ranges and handles
* them correctly.
*/
ovbcopy(from, to, bytes)
char *from, *to;
int bytes; /* num bytes to copy */
{
/* Assume that bcopy copies left-to-right (low addr first). */
if (from + bytes <= to || to + bytes <= from || to == from)
bcopy(from, to, bytes); /* non-overlapping or no-op*/
else if (from > to)
bcopy(from, to, bytes); /* overlapping but OK */
else {
/* to > from: overlapping, and must copy right-to-left. */
from += bytes - 1;
to += bytes - 1;
while (bytes-- > 0)
*to-- = *from--;
}
}
/*
* Return a pointer to the first occurence of 'c' in
* string s, or 0 if none.
*/
char *
index(s, c)
char *s;
char c;
{
char cc;
while ((cc = *s) != c) {
if (cc == 0)
return 0;
s++;
}
return s;
}
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