nulib2/nufxlib-0/MiscStuff.c
Andy McFadden 771144bcea Fixed "assert" vs "Assert", some naming convention lapses, and a
possible gotcha in the Squeeze code.
2002-09-28 00:57:36 +00:00

121 lines
2.9 KiB
C

/*
* Copyright (C) 2000 by Andy McFadden, All Rights Reserved.
* This is free software; you can redistribute it and/or modify it under the
* terms of the GNU Library General Public License, see the file COPYING.LIB.
*
* Misc stuff (shared between nufxlib and nulib2). This is a collection
* of standard functions that aren't available in libc on this system.
*/
#include "SysDefs.h"
#include "MiscStuff.h"
#include <ctype.h>
#ifndef HAVE_STRERROR
/*
* Return a pointer to the appropriate string in the system table, or NULL
* if the value is out of bounds.
*/
const char*
Nu_strerror(int errnum)
{
extern int sys_nerr;
extern char *sys_errlist[];
if (errnum < 0 || errnum > sys_nerr)
return NULL;
return sys_errlist[errnum];
}
#endif
#ifndef HAVE_MEMMOVE
/*
* Move a block of memory. Unlike memcpy, this is expected to work
* correctly with overlapping blocks.
*
* This is a straightforward implementation. A much faster implementation,
* from BSD, is available in the PGP 2.6.2 distribution, but this should
* suffice for those few systems that don't have memmove.
*/
void*
Nu_memmove(void* dst, const void* src, size_t n)
{
void* retval = dst;
char* srcp = (char*)src;
char* dstp = (char*)dst;
/* you can normally get away with this if n==0 */
Assert(dst != NULL);
Assert(src != NULL);
if (dstp == srcp || !n) {
/* nothing to do */
} else if (dstp > srcp) {
/* start from the end */
(char*)dstp += n-1;
(char*)srcp += n-1;
while (n--)
*dstp-- = *srcp--;
} else {
/* start from the front */
while (n--)
*dstp++ = *srcp++;
}
return retval;
}
#endif
#ifndef HAVE_STRTOUL
/*
* Perform strtol, but on an unsigned long.
*
* On systems that have strtol but don't have strtoul, the strtol
* function doesn't clamp the return value, making it similar in
* function to strtoul. The comparison is not exact, however,
* because strtoul is expected to lots of fancy things (like set
* errno to ERANGE).
*
* For our purposes here, strtol does all we need it to. Someday
* we should replace this with a "real" version.
*/
unsigned long
Nu_strtoul(const char *nptr, char **endptr, int base)
{
return strtol(nptr, endptr, base);
}
#endif
#ifndef HAVE_STRCASECMP
/*
* Compare two strings, case-insensitive.
*/
int
Nu_strcasecmp(const char *str1, const char *str2)
{
while (*str1 && *str2 && toupper(*str1) == toupper(*str2))
str1++, str2++;
return (toupper(*str1) - toupper(*str2));
}
#endif
#ifndef HAVE_STRNCASECMP
/*
* Compare two strings, case-insensitive, stopping after "n" chars.
*/
int
Nu_strncasecmp(const char *str1, const char *str2, size_t n)
{
while (n && *str1 && *str2 && toupper(*str1) == toupper(*str2))
str1++, str2++, n--;
if (n)
return (toupper(*str1) - toupper(*str2));
else
return 0; /* no mismatch in first n chars */
}
#endif