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Source:SLASH'EM 0.0.7E7F2/hacklib.c

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Below is the full text to hacklib.c from the source code of SLASH'EM 0.0.7E7F2. To link to a particular line, write [[SLASH'EM 0.0.7E7F2/hacklib.c#line123]], for example.

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1.    /*	SCCS Id: @(#)hacklib.c	3.4	2002/12/13	*/
2.    /* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
3.    /* Copyright (c) Robert Patrick Rankin, 1991		  */
4.    /* NetHack may be freely redistributed.  See license for details. */
5.    
6.    /* We could include only config.h, except for the overlay definitions... */
7.    #include "hack.h"
8.    /*=
9.        Assorted 'small' utility routines.	They're virtually independent of
10.   NetHack, except that rounddiv may call panic().
11.   
12.         return type     routine name    argument type(s)
13.   	boolean		digit		(char)
14.   	boolean		letter		(char)
15.   	char		highc		(char)
16.   	char		lowc		(char)
17.   	char *		lcase		(char *)
18.   	char *		upstart		(char *)
19.   	char *		mungspaces	(char *)
20.   	char *		eos		(char *)
21.   	char *		strkitten	(char *,char)
22.   	char *		s_suffix	(const char *)
23.   	char *		xcrypt		(const char *, char *)
24.   	boolean		onlyspace	(const char *)
25.   	char *		tabexpand	(char *)
26.   	char *		visctrl		(char)
27.   	const char *	ordin		(int)
28.   	char *		sitoa		(int)
29.   	int		sgn		(int)
30.   	int		rounddiv	(long, int)
31.   	int		distmin		(int, int, int, int)
32.   	int		dist2		(int, int, int, int)
33.   	boolean		online2		(int, int)
34.   	boolean		pmatch		(const char *, const char *)
35.   	int		strncmpi	(const char *, const char *, int)
36.   	char *		strstri		(const char *, const char *)
37.   	boolean		fuzzymatch	(const char *,const char *,const char *,boolean)
38.   	void		setrandom	(void)
39.   	int		getyear		(void)
40.   	char *		yymmdd		(time_t)
41.   	long		yyyymmdd	(time_t)
42.   	int		phase_of_the_moon	(void)
43.   	boolean		friday_13th	(void)
44.   	int		night		(void)
45.   	int		midnight	(void)
46.   =*/
47.   #ifdef LINT
48.   # define Static		/* pacify lint */
49.   #else
50.   # define Static static
51.   #endif
52.   
53.   #ifdef OVLB
54.   boolean
55.   digit(c)		/* is 'c' a digit? */
56.       char c;
57.   {
58.       return((boolean)('0' <= c && c <= '9'));
59.   }
60.   
61.   boolean
62.   letter(c)		/* is 'c' a letter?  note: '@' classed as letter */
63.       char c;
64.   {
65.       return((boolean)(('@' <= c && c <= 'Z') || ('a' <= c && c <= 'z')));
66.   }
67.   #endif /* OVLB */
68.   
69.   #ifdef OVL1
70.   char
71.   highc(c)			/* force 'c' into uppercase */
72.       char c;
73.   {
74.       return((char)(('a' <= c && c <= 'z') ? (c & ~040) : c));
75.   }
76.   
77.   char
78.   lowc(c)			/* force 'c' into lowercase */
79.       char c;
80.   {
81.       return((char)(('A' <= c && c <= 'Z') ? (c | 040) : c));
82.   }
83.   #endif /* OVL1 */
84.   
85.   #ifdef OVLB
86.   char *
87.   lcase(s)		/* convert a string into all lowercase */
88.       char *s;
89.   {
90.       register char *p;
91.   
92.       for (p = s; *p; p++)
93.   	if ('A' <= *p && *p <= 'Z') *p |= 040;
94.       return s;
95.   }
96.   
97.   char *
98.   upstart(s)		/* convert first character of a string to uppercase */
99.       char *s;
100.  {
101.      if (s) *s = highc(*s);
102.      return s;
103.  }
104.  
105.  /* remove excess whitespace from a string buffer (in place) */
106.  char *
107.  mungspaces(bp)
108.  char *bp;
109.  {
110.      register char c, *p, *p2;
111.      boolean was_space = TRUE;
112.  
113.      for (p = p2 = bp; (c = *p) != '\0'; p++) {
114.  	if (c == '\t') c = ' ';
115.  	if (c != ' ' || !was_space) *p2++ = c;
116.  	was_space = (c == ' ');
117.      }
118.      if (was_space && p2 > bp) p2--;
119.      *p2 = '\0';
120.      return bp;
121.  }
122.  
123.  #endif /* OVLB */
124.  
125.  #ifdef OVL0
126.  char *
127.  eos(s)			/* return the end of a string (pointing at '\0') */
128.      register char *s;
129.  {
130.      while (*s) s++;	/* s += strlen(s); */
131.      return s;
132.  }
133.  
134.  /* strcat(s, {c,'\0'}); */
135.  char *
136.  strkitten(s, c)		/* append a character to a string (in place) */
137.      char *s;
138.      char c;
139.  {
140.      char *p = eos(s);
141.  
142.      *p++ = c;
143.      *p = '\0';
144.      return s;
145.  }
146.  
147.  char *
148.  s_suffix(s)		/* return a name converted to possessive */
149.      const char *s;
150.  {
151.      Static char buf[BUFSZ];
152.  
153.      Strcpy(buf, s);
154.      if(!strcmpi(buf, "it"))
155.  	Strcat(buf, "s");
156.      else if(*(eos(buf)-1) == 's')
157.  	Strcat(buf, "'");
158.      else
159.  	Strcat(buf, "'s");
160.      return buf;
161.  }
162.  
163.  char *
164.  xcrypt(str, buf)	/* trivial text encryption routine (see makedefs) */
165.  const char *str;
166.  char *buf;
167.  {
168.      register const char *p;
169.      register char *q;
170.      register int bitmask;
171.  
172.      for (bitmask = 1, p = str, q = buf; *p; q++) {
173.  	*q = *p++;
174.  	if (*q & (32|64)) *q ^= bitmask;
175.  	if ((bitmask <<= 1) >= 32) bitmask = 1;
176.      }
177.      *q = '\0';
178.      return buf;
179.  }
180.  #endif /* OVL0 */
181.  
182.  #ifdef OVL2
183.  boolean
184.  onlyspace(s)		/* is a string entirely whitespace? */
185.      const char *s;
186.  {
187.      for (; *s; s++)
188.  	if (*s != ' ' && *s != '\t') return FALSE;
189.      return TRUE;
190.  }
191.  #endif /* OVL2 */
192.  
193.  #ifdef OVLB
194.  char *
195.  tabexpand(sbuf)		/* expand tabs into proper number of spaces */
196.      char *sbuf;
197.  {
198.      char buf[BUFSZ];
199.      register char *bp, *s = sbuf;
200.      register int idx;
201.  
202.      if (!*s) return sbuf;
203.  
204.      /* warning: no bounds checking performed */
205.      for (bp = buf, idx = 0; *s; s++)
206.  	if (*s == '\t') {
207.  	    do *bp++ = ' '; while (++idx % 8);
208.  	} else {
209.  	    *bp++ = *s;
210.  	    idx++;
211.  	}
212.      *bp = 0;
213.      return strcpy(sbuf, buf);
214.  }
215.  
216.  char *
217.  visctrl(c)		/* make a displayable string from a character */
218.      char c;
219.  {
220.      Static char ccc[3];
221.  
222.      c &= 0177;
223.  
224.      ccc[2] = '\0';
225.      if (c < 040) {
226.  	ccc[0] = '^';
227.  	ccc[1] = c | 0100;	/* letter */
228.      } else if (c == 0177) {
229.  	ccc[0] = '^';
230.  	ccc[1] = c & ~0100;	/* '?' */
231.      } else {
232.  	ccc[0] = c;		/* printable character */
233.  	ccc[1] = '\0';
234.      }
235.      return ccc;
236.  }
237.  #endif /* OVLB */
238.  
239.  #ifdef OVL2
240.  const char *
241.  ordin(n)		/* return the ordinal suffix of a number */
242.      int n;			/* note: should be non-negative */
243.  {
244.      register int dd = n % 10;
245.  
246.      return (dd == 0 || dd > 3 || (n % 100) / 10 == 1) ? "th" :
247.  	    (dd == 1) ? "st" : (dd == 2) ? "nd" : "rd";
248.  }
249.  #endif /* OVL2 */
250.  
251.  #ifdef OVL1
252.  char *
253.  sitoa(n)		/* make a signed digit string from a number */
254.      int n;
255.  {
256.      Static char buf[13];
257.  
258.      Sprintf(buf, (n < 0) ? "%d" : "+%d", n);
259.      return buf;
260.  }
261.  
262.  int
263.  sgn(n)			/* return the sign of a number: -1, 0, or 1 */
264.      int n;
265.  {
266.      return (n < 0) ? -1 : (n != 0);
267.  }
268.  #endif /* OVL1 */
269.  
270.  #ifdef OVLB
271.  int
272.  rounddiv(x, y)		/* calculate x/y, rounding as appropriate */
273.      long x;
274.      int  y;
275.  {
276.      int r, m;
277.      int divsgn = 1;
278.  
279.      if (y == 0)
280.  	panic("division by zero in rounddiv");
281.      else if (y < 0) {
282.  	divsgn = -divsgn;  y = -y;
283.      }
284.      if (x < 0) {
285.  	divsgn = -divsgn;  x = -x;
286.      }
287.      r = x / y;
288.      m = x % y;
289.      if (2*m >= y) r++;
290.  
291.      return divsgn * r;
292.  }
293.  #endif /* OVLB */
294.  
295.  #ifdef OVL0
296.  int
297.  distmin(x0, y0, x1, y1) /* distance between two points, in moves */
298.      int x0, y0, x1, y1;
299.  {
300.      register int dx = x0 - x1, dy = y0 - y1;
301.      if (dx < 0) dx = -dx;
302.      if (dy < 0) dy = -dy;
303.    /*  The minimum number of moves to get from (x0,y0) to (x1,y1) is the
304.     :  larger of the [absolute value of the] two deltas.
305.     */
306.      return (dx < dy) ? dy : dx;
307.  }
308.  
309.  int
310.  dist2(x0, y0, x1, y1)	/* square of euclidean distance between pair of pts */
311.      int x0, y0, x1, y1;
312.  {
313.      register int dx = x0 - x1, dy = y0 - y1;
314.      return dx * dx + dy * dy;
315.  }
316.  
317.  boolean
318.  online2(x0, y0, x1, y1) /* are two points lined up (on a straight line)? */
319.      int x0, y0, x1, y1;
320.  {
321.      int dx = x0 - x1, dy = y0 - y1;
322.      /*  If either delta is zero then they're on an orthogonal line,
323.       *  else if the deltas are equal (signs ignored) they're on a diagonal.
324.       */
325.      return((boolean)(!dy || !dx || (dy == dx) || (dy + dx == 0)));	/* (dy == -dx) */
326.  }
327.  
328.  #endif /* OVL0 */
329.  #ifdef OVLB
330.  
331.  boolean
332.  pmatch(patrn, strng)	/* match a string against a pattern */
333.      const char *patrn, *strng;
334.  {
335.      char s, p;
336.    /*
337.     :  Simple pattern matcher:  '*' matches 0 or more characters, '?' matches
338.     :  any single character.  Returns TRUE if 'strng' matches 'patrn'.
339.     */
340.  pmatch_top:
341.      s = *strng++;  p = *patrn++;	/* get next chars and pre-advance */
342.      if (!p)			/* end of pattern */
343.  	return((boolean)(s == '\0'));		/* matches iff end of string too */
344.      else if (p == '*')		/* wildcard reached */
345.  	return((boolean)((!*patrn || pmatch(patrn, strng-1)) ? TRUE :
346.  		s ? pmatch(patrn-1, strng) : FALSE));
347.      else if (p != s && (p != '?' || !s))  /* check single character */
348.  	return FALSE;		/* doesn't match */
349.      else				/* return pmatch(patrn, strng); */
350.  	goto pmatch_top;	/* optimize tail recursion */
351.  }
352.  #endif /* OVLB */
353.  
354.  #ifdef OVL2
355.  #ifndef STRNCMPI
356.  int
357.  strncmpi(s1, s2, n)	/* case insensitive counted string comparison */
358.      register const char *s1, *s2;
359.      register int n; /*(should probably be size_t, which is usually unsigned)*/
360.  {					/*{ aka strncasecmp }*/
361.      register char t1, t2;
362.  
363.      while (n--) {
364.  	if (!*s2) return (*s1 != 0);	/* s1 >= s2 */
365.  	else if (!*s1) return -1;	/* s1  < s2 */
366.  	t1 = lowc(*s1++);
367.  	t2 = lowc(*s2++);
368.  	if (t1 != t2) return (t1 > t2) ? 1 : -1;
369.      }
370.      return 0;				/* s1 == s2 */
371.  }
372.  #endif	/* STRNCMPI */
373.  #endif /* OVL2 */
374.  
375.  #ifdef OVLB
376.  #ifndef STRSTRI
377.  
378.  char *
379.  strstri(str, sub)	/* case insensitive substring search */
380.      const char *str;
381.      const char *sub;
382.  {
383.      register const char *s1, *s2;
384.      register int i, k;
385.  # define TABSIZ 0x20	/* 0x40 would be case-sensitive */
386.      char tstr[TABSIZ], tsub[TABSIZ];	/* nibble count tables */
387.  # if 0
388.      assert( (TABSIZ & ~(TABSIZ-1)) == TABSIZ ); /* must be exact power of 2 */
389.      assert( &lowc != 0 );			/* can't be unsafe macro */
390.  # endif
391.  
392.      /* special case: empty substring */
393.      if (!*sub)	return (char *) str;
394.  
395.      /* do some useful work while determining relative lengths */
396.      for (i = 0; i < TABSIZ; i++)  tstr[i] = tsub[i] = 0;	/* init */
397.      for (k = 0, s1 = str; *s1; k++)  tstr[*s1++ & (TABSIZ-1)]++;
398.      for (	s2 = sub; *s2; --k)  tsub[*s2++ & (TABSIZ-1)]++;
399.  
400.      /* evaluate the info we've collected */
401.      if (k < 0)	return (char *) 0;  /* sub longer than str, so can't match */
402.      for (i = 0; i < TABSIZ; i++)	/* does sub have more 'x's than str? */
403.  	if (tsub[i] > tstr[i])	return (char *) 0;  /* match not possible */
404.  
405.      /* now actually compare the substring repeatedly to parts of the string */
406.      for (i = 0; i <= k; i++) {
407.  	s1 = &str[i];
408.  	s2 = sub;
409.  	while (lowc(*s1++) == lowc(*s2++))
410.  	    if (!*s2)  return (char *) &str[i];		/* full match */
411.      }
412.      return (char *) 0;	/* not found */
413.  }
414.  #endif	/* STRSTRI */
415.  
416.  /* compare two strings for equality, ignoring the presence of specified
417.     characters (typically whitespace) and possibly ignoring case */
418.  boolean
419.  fuzzymatch(s1, s2, ignore_chars, caseblind)
420.      const char *s1, *s2;
421.      const char *ignore_chars;
422.      boolean caseblind;
423.  {
424.      register char c1, c2;
425.  
426.      do {
427.  	while ((c1 = *s1++) != '\0' && index(ignore_chars, c1) != 0) continue;
428.  	while ((c2 = *s2++) != '\0' && index(ignore_chars, c2) != 0) continue;
429.  	if (!c1 || !c2) break;	/* stop when end of either string is reached */
430.  
431.  	if (caseblind) {
432.  	    c1 = lowc(c1);
433.  	    c2 = lowc(c2);
434.  	}
435.      } while (c1 == c2);
436.  
437.      /* match occurs only when the end of both strings has been reached */
438.      return (boolean)(!c1 && !c2);
439.  }
440.  
441.  #endif /* OVLB */
442.  #ifdef OVL2
443.  
444.  /*
445.   * Time routines
446.   *
447.   * The time is used for:
448.   *	- seed for rand()
449.   *	- year on tombstone and yyyymmdd in record file
450.   *	- phase of the moon (various monsters react to NEW_MOON or FULL_MOON)
451.   *	- night and midnight (the undead are dangerous at midnight)
452.   *	- determination of what files are "very old"
453.   */
454.  
455.  #if defined(AMIGA) && !defined(AZTEC_C) && !defined(__SASC_60) && !defined(_DCC) && !defined(__GNUC__)
456.  extern struct tm *FDECL(localtime,(time_t *));
457.  #endif
458.  static struct tm *NDECL(getlt);
459.  
460.  void
461.  setrandom()
462.  {
463.  	/* the types are different enough here that sweeping the different
464.  	 * routine names into one via #defines is even more confusing
465.  	 */
466.  #ifdef RANDOM	/* srandom() from sys/share/random.c */
467.  	srandom((unsigned int) time((time_t *)0));
468.  #else
469.  # if defined(BSD) || defined(LINUX) || defined(ULTRIX) || defined(CYGWIN32) /* system srandom() */
470.  #  if defined(BSD) && !defined(POSIX_TYPES)
471.  #   if defined(SUNOS4)
472.  	(void)
473.  #   endif
474.  		srandom((int) time((long *)0));
475.  #  else
476.  		srandom((int) time((time_t *)0));
477.  #  endif
478.  # else
479.  #  ifdef UNIX	/* system srand48() */
480.  	srand48((long) time((time_t *)0));
481.  #  else		/* poor quality system routine */
482.  	srand((int) time((time_t *)0));
483.  #  endif
484.  # endif
485.  #endif
486.  }
487.  
488.  static struct tm *
489.  getlt()
490.  {
491.  	time_t date;
492.  
493.  #if defined(BSD) && !defined(POSIX_TYPES)
494.  	(void) time((long *)(&date));
495.  #else
496.  	(void) time(&date);
497.  #endif
498.  #if (defined(ULTRIX) && !(defined(ULTRIX_PROTO) || defined(NHSTDC))) || (defined(BSD) && !defined(POSIX_TYPES))
499.  	return(localtime((long *)(&date)));
500.  #else
501.  	return(localtime(&date));
502.  #endif
503.  }
504.  
505.  int
506.  getyear()
507.  {
508.  	return(1900 + getlt()->tm_year);
509.  }
510.  
511.  /* KMH -- Used by gypsies */
512.  int
513.  getmonth()
514.  {
515.  	return (getlt()->tm_mon);
516.  }
517.  
518.  #if 0
519.  /* This routine is no longer used since in 2000 it will yield "100mmdd". */
520.  char *
521.  yymmdd(date)
522.  time_t date;
523.  {
524.  	Static char datestr[10];
525.  	struct tm *lt;
526.  
527.  	if (date == 0)
528.  		lt = getlt();
529.  	else
530.  #if (defined(ULTRIX) && !(defined(ULTRIX_PROTO) || defined(NHSTDC))) || defined(BSD)
531.  		lt = localtime((long *)(&date));
532.  #else
533.  		lt = localtime(&date);
534.  #endif
535.  
536.  	Sprintf(datestr, "%02d%02d%02d",
537.  		lt->tm_year, lt->tm_mon + 1, lt->tm_mday);
538.  	return(datestr);
539.  }
540.  #endif
541.  
542.  long
543.  yyyymmdd(date)
544.  time_t date;
545.  {
546.  	long datenum;
547.  	struct tm *lt;
548.  
549.  	if (date == 0)
550.  		lt = getlt();
551.  	else
552.  #if (defined(ULTRIX) && !(defined(ULTRIX_PROTO) || defined(NHSTDC))) || (defined(BSD) && !defined(POSIX_TYPES))
553.  		lt = localtime((long *)(&date));
554.  #else
555.  		lt = localtime(&date);
556.  #endif
557.  
558.  	/* just in case somebody's localtime supplies (year % 100)
559.  	   rather than the expected (year - 1900) */
560.  	if (lt->tm_year < 70)
561.  	    datenum = (long)lt->tm_year + 2000L;
562.  	else
563.  	    datenum = (long)lt->tm_year + 1900L;
564.  	/* yyyy --> yyyymm */
565.  	datenum = datenum * 100L + (long)(lt->tm_mon + 1);
566.  	/* yyyymm --> yyyymmdd */
567.  	datenum = datenum * 100L + (long)lt->tm_mday;
568.  	return datenum;
569.  }
570.  
571.  /*
572.   * moon period = 29.53058 days ~= 30, year = 365.2422 days
573.   * days moon phase advances on first day of year compared to preceding year
574.   *	= 365.2422 - 12*29.53058 ~= 11
575.   * years in Metonic cycle (time until same phases fall on the same days of
576.   *	the month) = 18.6 ~= 19
577.   * moon phase on first day of year (epact) ~= (11*(year%19) + 29) % 30
578.   *	(29 as initial condition)
579.   * current phase in days = first day phase + days elapsed in year
580.   * 6 moons ~= 177 days
581.   * 177 ~= 8 reported phases * 22
582.   * + 11/22 for rounding
583.   */
584.  int
585.  phase_of_the_moon()		/* 0-7, with 0: new, 4: full */
586.  {
587.  	register struct tm *lt = getlt();
588.  	register int epact, diy, goldn;
589.  
590.  	diy = lt->tm_yday;
591.  	goldn = (lt->tm_year % 19) + 1;
592.  	epact = (11 * goldn + 18) % 30;
593.  	if ((epact == 25 && goldn > 11) || epact == 24)
594.  		epact++;
595.  
596.  	return( (((((diy + epact) * 6) + 11) % 177) / 22) & 7 );
597.  }
598.  
599.  boolean
600.  friday_13th()
601.  {
602.  	register struct tm *lt = getlt();
603.  
604.  	return((boolean)(lt->tm_wday == 5 /* friday */ && lt->tm_mday == 13));
605.  }
606.  
607.  boolean
608.  groundhog_day()
609.  {
610.  	register struct tm *lt = getlt();
611.  
612.  	/* KMH -- Groundhog Day is February 2 */
613.  	return((boolean)(lt->tm_mon == 1 && lt->tm_mday == 2));
614.  }
615.  
616.  int
617.  night()
618.  {
619.  	register int hour = getlt()->tm_hour;
620.  
621.  	return(hour < 6 || hour > 21);
622.  }
623.  
624.  int
625.  midnight()
626.  {
627.  	return(getlt()->tm_hour == 0);
628.  }
629.  #endif /* OVL2 */
630.  
631.  /*hacklib.c*/

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