util.c

早期freebsd实现

	*line1 = *line2;
	*char1 = *char2;
	*line2 = tline;
	*char2 = tchar;

	return YES;
}

bool
inlist(first, what)
register Line	*first,
		*what;
{
	while (first) {
		if (first == what)
			return YES;
		first = first->l_next;
	}
	return NO;
}

/* Make `buf' (un)modified and tell the redisplay code to update the modeline
   if it will need to be changed. */

int	ModCount = 0;

void
modify()
{
	if (!curbuf->b_modified) {
		UpdModLine = YES;
		curbuf->b_modified = YES;
	}
	DOLsave = YES;
	if (!Asking)
		ModCount += 1;
}

void
unmodify()
{
	if (curbuf->b_modified) {
		UpdModLine = YES;
		curbuf->b_modified = NO;
	}
}

int
numcomp(s1, s2)
register char	*s1,
		*s2;
{
	register int	count = 0;

	while (*s1 != '\0' && *s1++ == *s2++)
		count += 1;
	return count;
}

char *
copystr(str)
char	*str;
{
	char	*val;

	if (str == NULL)
		return NULL;
	val = emalloc((size_t) (strlen(str) + 1));

	strcpy(val, str);
	return val;
}

#ifndef	byte_copy
void
byte_copy(from, to, count)
UnivConstPtr	*from;
UnivPtr		*to;
register size_t	count;
{
	register const char	*p = from;
	register char		*q = to;

	if (count != 0) {
	    do *q++ = *p++; while (--count != 0);
	}
}
#endif

void
len_error(flag)
int	flag;
{
	char	*mesg = "[line too long]";

	if (flag == COMPLAIN)
		complain(mesg);
	else
		error(mesg);
}

/* Insert num number of c's at offset atchar in a linebuf of LBSIZE */

void
ins_c(c, buf, atchar, num, max)
int	c;
char	*buf;
int	atchar,
	num,
	max;
{
	register char	*pp, *pp1;
	register int	len;
	int	numchars;	/* number of characters to copy forward */

	if (num <= 0)
		return;
	len = atchar + strlen(&buf[atchar]);
	if (len + num >= max)
		len_error(COMPLAIN);
	pp = &buf[len + 1];		/* + 1 so we can --pp (not pp--) */
	pp1 = &buf[len + num + 1];
	numchars = len - atchar;
	while (numchars-- >= 0)
		*--pp1 = *--pp;
	pp = &buf[atchar];
	while (--num >= 0)
		*pp++ = c;
}

int
TwoBlank()
{
	register Line	*next = curline->l_next;

	return ((next != NULL) &&
		(*(lcontents(next)) == '\0') &&
		(next->l_next != NULL) &&
		(*(lcontents(next->l_next)) == '\0'));
}

void
linecopy(onto, atchar, from)
register char	*onto,
		*from;
int	atchar;
{
	register char	*endp = &onto[LBSIZE];

	onto += atchar;

	do {
		if (onto >= endp)
			len_error(ERROR);
	} while ((*onto++ = *from++) != '\0');
}

char *
IOerr(err, file)
char	*err, *file;
{
	return sprint("Couldn't %s \"%s\".", err, file);
}

#ifdef	UNIX
void
dopipe(p)
int	*p;
{
	if (pipe(p) == -1)
		complain("[Pipe failed: %s]", strerror(errno));
}

void
pipeclose(p)
int	*p;
{
	(void) close(p[0]);
	(void) close(p[1]);
}
#endif	/* UNIX */

/* NOSTRICT */

UnivPtr
emalloc(size)
size_t	size;
{
	register UnivPtr	ptr;

	if ((ptr = malloc(size)) == NULL) {
		/* Try garbage collecting lines */
		GCchunks();
		if ((ptr = malloc(size)) == NULL) {
			/* Uh ... Oh screw it! */
			error("[Out of memory] ");
			/* NOTREACHED */
		}
	}
	return ptr;
}

UnivPtr
erealloc(ptr, size)
UnivPtr	ptr;
size_t	size;
{
	if ((ptr = realloc(ptr, size)) == NULL) {
		/* no second chance for realloc! */
		error("[out of memory]");
		/* NOTREACHED */
	}
	return ptr;
}

/* Return the basename of file F. */

char *
basename(f)
register char	*f;
{
	register char	*cp;

	if ((cp = strrchr(f, '/')) != NULL)
		return cp + 1;
	else
#ifdef	MSDOS
		if (cp = strrchr(f, '\\'))
			return cp + 1;
	else
		if (cp = strrchr(f, ':'))
			return cp + 1;
#endif	/* MSDOS */
		return f;
}

void
push_env(savejmp)
jmp_buf	savejmp;
{
	byte_copy((UnivPtr) mainjmp, (UnivPtr) savejmp, sizeof (jmp_buf));
}

void
pop_env(savejmp)
jmp_buf	savejmp;
{
	byte_copy((UnivPtr) savejmp, (UnivPtr) mainjmp, sizeof (jmp_buf));
}

/* get the time buf, designated by *timep, from FROM to TO. */
char *
get_time(timep, buf, from, to)
time_t	*timep;
char	*buf;
int	from,
	to;
{
	time_t	now;
	char	*cp;

	if (timep != NULL)
		now = *timep;
	else
		(void) time(&now);
	cp = ctime(&now) + from;
#ifndef	MSDOS
	if (to == -1)
#else	/* MSDOS */
	if ((to == -1) && (cp[strlen(cp)-1] == '\n'))
#endif	/* MSDOS */
		cp[strlen(cp) - 1] = '\0';		/* Get rid of \n */
	else
		cp[to - from] = '\0';
	if (buf) {
		strcpy(buf, cp);
		return buf;
	} else {
		return cp;
	}
}

int
casecmp(s1, s2)
register char	*s1,
		*s2;
{
	if (s1==NULL || s2==NULL)
		return 1;	/* which is not zero ... */
	while (CharUpcase(*s1) == CharUpcase(*s2++))
		if (*s1++ == '\0')
			return 0;
	return (*s1 - *--s2);
}

int
casencmp(s1, s2, n)
register char	*s1,
		*s2;
register size_t	n;
{
	if (s1==NULL || s2==NULL)
		return 1;	/* which is not zero ... */
	for (;;) {
		if (n == 0)
			return 0;
		n--;
		if (CharUpcase(*s1) != CharUpcase(*s2++))
			return *s1 - *--s2;
		if (*s1++ == '\0')
			return 0;
	}
}

void
null_ncpy(to, from, n)
char	*to,
	*from;
size_t	n;
{
	(void) strncpy(to, from, n);
	to[n] = '\0';
}

/* Tries to pause for delay/10 seconds OR until a character is typed
   at the keyboard.  This works well on BSD4_2 and not so well on the
   rest. */

#ifdef	BSD4_2
# ifndef	BSD2_10
#   include <sys/time.h>
# endif
#endif

#ifdef	MSDOS
# include <bios.h>
# include <dos.h>
#endif

void
SitFor(delay)
int	delay;
{
#ifdef	MAC
	long	start,
		end;

#define Ticks ((long *) 0x16A)	/* 1/60 sec */
	Keyonly = YES;
	redisplay();
	start = *Ticks;

	end = start + delay * 6;
	do {
		if ((InputPending = charp()) != NO)
			break;
	} while (*Ticks < end);
#undef	Ticks

#else	/* !MAC */

#ifndef	MSDOS
	if (!charp()) {
#if	defined(BSD4_2) && !defined(BSD2_10)
		struct timeval	timer;
		fd_set	readfds;

		FD_ZERO(&readfds);
		FD_SET(0, &readfds);
		
		/* So messages that aren't error messages don't
		 * hang around forever.
		 * Gross that I had to snarf this from getch()
		 */
		if (!UpdMesg && !Asking && mesgbuf[0] && !errormsg)
			message(NullStr);
		redisplay();

		timer.tv_sec = (delay / 10);
		timer.tv_usec = (delay % 10) * 100000;
		select(1, &readfds, (fd_set *)0, (fd_set *)0, &timer);
#else	/* !(defined(BSD4_2) && !defined(BSD2_10)) */
		/* Pause by spitting NULs at the terminal.  Ugh! */
		static const int cps[] = {
			0,
			5,
			7,
			11,
			13,
			15,
			20,
			30,
			60,
			120,
			180,
			240,
			480,
			960,
			1920,
			1920,
		};
		register int	nchars,
				check_cnt;

		nchars = (delay * cps[ospeed]) / 10;
		check_cnt = BufSize;
		redisplay();
		if (!NP) {
			while ((--nchars > 0) && !InputPending) {
				jputchar(PC);
				if (--check_cnt == 0) {
					check_cnt = BufSize;
					InputPending = charp();
				}
			}
		}
#endif	/* !(defined(BSD4_2) && !defined(BSD2_10)) */
	}
#else	/* MSDOS */

	long	start,
		end;
#ifndef	IBMPC
	struct dostime_t tc;
#endif

	redisplay();
#ifdef	IBMPC
	_bios_timeofday(_TIME_GETCLOCK, &start);
#else
	_dos_gettime(&tc);
	start = (long)(tc.hour*60L*60L*10L)+(long)(tc.minute*60L*10L)+
	    (long)(tc.second*10)+(long)(tc.hsecond/10);
#endif
	end = (start + delay);
	do  {
		if ((InputPending = charp()) != NO)
			break;
#ifdef	IBMPC
		if (_bios_timeofday(_TIME_GETCLOCK, &start))
			break;	/* after midnight */
#else
		start = (long)(tc.hour*60L*60L*10L)+(long)(tc.minute*60L*10L)+
			(long)(tc.second*10)+(long)(tc.hsecond/10);
#endif
	} while (start < end);
#endif	/* MSDOS */
#endif	/* !MAC */
}

bool
sindex(pattern, string)
register char	*pattern,
		*string;
{
	register size_t	len = strlen(pattern);

	while (*string != '\0') {
		if (*pattern == *string && strncmp(pattern, string, len) == 0)
			return TRUE;
		string += 1;
	}
	return FALSE;
}

void
make_argv(argv, ap)
register char	*argv[];
va_list	ap;
{
	register int	i = 0;

	argv[i++] = va_arg(ap, char *);
	argv[i++] = basename(argv[0]);
	do ; while ((argv[i++] = va_arg(ap, char *)) != NULL);
}

int
pnt_line()
{
	register Line	*lp = curbuf->b_first;
	register int	i;

	for (i = 0; lp != NULL; i++, lp = lp->l_next)
		if (lp == curline)
			break;
	return i + 1;
}

/* Free, then allocate a block.
 * Like erealloc, except that the previous contents of the block are lost.
 */

UnivPtr
freealloc(obj, size)
register UnivPtr	obj;
size_t	size;
{
	register UnivPtr	new = NULL;

	if (obj)
		new = realloc(obj, size);
	if (new == NULL)
		new = emalloc(size);
	return new;
}

#ifndef HAVE_STRERROR
/*
 * Unix version of strerror - map error number to descriptive string.
 * ANSI systems should have this.
 */
char *
strerror(errnum)
int errnum;
{
	extern int sys_nerr;
	extern char *sys_errlist[];

	if (errnum > 0 && errnum < sys_nerr)
		return(sys_errlist[errnum]);
	return sprint("Error number %d", errnum);
}
#endif