Source:Hack 1.0/hack.topl.c

Below is the full text to hack.topl.c from the source code of Hack 1.0. To link to a particular line, write [[Hack 1.0/hack.topl.c#line123]], for example.

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1.    /* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1984. */
2.    
3.    #include "hack.h"
4.    #include <stdio.h>
5.    extern char *eos();
6.    #define	TOPLSZ	(COLNO-8)	/* leave room for --More-- */
7.    char toplines[BUFSZ];
8.    xchar tlx, tly;			/* set by pline; used by addtopl */
9.    
10.   struct topl {
11.   	struct topl *next_topl;
12.   	char *topl_text;
13.   } *old_toplines, *last_redone_topl;
14.   #define	OTLMAX	20		/* max nr of old toplines remembered */
15.   
16.   doredotopl(){
17.   	if(last_redone_topl)
18.   		last_redone_topl = last_redone_topl->next_topl;
19.   	if(!last_redone_topl)
20.   		last_redone_topl = old_toplines;
21.   	if(last_redone_topl){
22.   		(void) strcpy(toplines, last_redone_topl->topl_text);
23.   	}
24.   	redotoplin();
25.   	return(0);
26.   }
27.   
28.   redotoplin() {
29.   	home();
30.   	if(index(toplines, '\n')) cl_end();
31.   	putstr(toplines);
32.   	cl_end();
33.   	tlx = curx;
34.   	tly = cury;
35.   	flags.topl = 1;
36.   	if(tly > 1)
37.   		more();
38.   }
39.   
40.   remember_topl() {
41.   register struct topl *tl;
42.   register int cnt = OTLMAX;
43.   	if(last_redone_topl &&
44.   	   !strcmp(toplines, last_redone_topl->topl_text)) return;
45.   	if(old_toplines &&
46.   	   !strcmp(toplines, old_toplines->topl_text)) return;
47.   	last_redone_topl = 0;
48.   	tl = (struct topl *)
49.   		alloc((unsigned)(strlen(toplines) + sizeof(struct topl) + 1));
50.   	tl->next_topl = old_toplines;
51.   	tl->topl_text = (char *)(tl + 1);
52.   	(void) strcpy(tl->topl_text, toplines);
53.   	old_toplines = tl;
54.   	while(cnt && tl){
55.   		cnt--;
56.   		tl = tl->next_topl;
57.   	}
58.   	if(tl && tl->next_topl){
59.   		free((char *) tl->next_topl);
60.   		tl->next_topl = 0;
61.   	}
62.   }
63.   
64.   addtopl(s) char *s; {
65.   	curs(tlx,tly);
66.   	if(tlx + strlen(s) > COLNO) putsym('\n');
67.   	putstr(s);
68.   	tlx = curx;
69.   	tly = cury;
70.   	flags.topl = 1;
71.   }
72.   
73.   xmore(spaceflag)
74.   boolean spaceflag;	/* TRUE if space required */
75.   {
76.   	if(flags.topl) {
77.   		curs(tlx, tly);
78.   		if(tlx + 8 > COLNO) putsym('\n'), tly++;
79.   	}
80.   	putstr("--More--");
81.   	xwaitforspace(spaceflag);
82.   	if(flags.topl && tly > 1) {
83.   		home();
84.   		cl_end();
85.   		docorner(1, tly-1);
86.   	}
87.   	flags.topl = 0;
88.   }
89.   
90.   more(){
91.   	xmore(TRUE);
92.   }
93.   
94.   cmore(){
95.   	xmore(FALSE);
96.   }
97.   
98.   clrlin(){
99.   	if(flags.topl) {
100.  		home();
101.  		cl_end();
102.  		if(tly > 1) docorner(1, tly-1);
103.  		remember_topl();
104.  	}
105.  	flags.topl = 0;
106.  }
107.  
108.  /*VARARGS1*/
109.  pline(line,arg1,arg2,arg3,arg4,arg5,arg6)
110.  register char *line,*arg1,*arg2,*arg3,*arg4,*arg5,*arg6;
111.  {
112.  	char pbuf[BUFSZ];
113.  	register char *bp = pbuf, *tl;
114.  	register int n,n0;
115.  
116.  	if(!line || !*line) return;
117.  	if(!index(line, '%')) (void) strcpy(pbuf,line); else
118.  	(void) sprintf(pbuf,line,arg1,arg2,arg3,arg4,arg5,arg6);
119.  	if(flags.topl == 1 && !strcmp(pbuf, toplines)) return;
120.  	nscr();		/* %% */
121.  
122.  	/* If there is room on the line, print message on same line */
123.  	/* But messages like "You die..." deserve their own line */
124.  	n0 = strlen(bp);
125.  	if(flags.topl == 1 && tly == 1 &&
126.  	    n0 + strlen(toplines) + 3 < TOPLSZ &&
127.  	    strncmp(bp, "You ", 4)) {
128.  		(void) strcat(toplines, "  ");
129.  		(void) strcat(toplines, bp);
130.  		tlx += 2;
131.  		addtopl(bp);
132.  		return;
133.  	}
134.  	if(flags.topl == 1) more();
135.  	remember_topl();
136.  	toplines[0] = 0;
137.  	while(n0){
138.  		if(n0 >= COLNO){
139.  			/* look for appropriate cut point */
140.  			n0 = 0;
141.  			for(n = 0; n < COLNO; n++) if(bp[n] == ' ')
142.  				n0 = n;
143.  			if(!n0) for(n = 0; n < COLNO-1; n++)
144.  				if(!letter(bp[n])) n0 = n;
145.  			if(!n0) n0 = COLNO-2;
146.  		}
147.  		(void) strncpy((tl = eos(toplines)), bp, n0);
148.  		tl[n0] = 0;
149.  		bp += n0;
150.  
151.  		/* remove trailing spaces, but leave one */
152.  		while(n0 > 1 && tl[n0-1] == ' ' && tl[n0-2] == ' ')
153.  			tl[--n0] = 0;
154.  
155.  		n0 = strlen(bp);
156.  		if(n0 && tl[0]) (void) strcat(tl, "\n");
157.  	}
158.  	redotoplin();
159.  }
160.  
161.  putsym(c) char c; {
162.  	switch(c) {
163.  	case '\b':
164.  		backsp();
165.  		return;
166.  	case '\n':
167.  		curx = 1;
168.  		cury++;
169.  		if(cury > tly) tly = cury;
170.  		break;
171.  	default:
172.  		curx++;
173.  		if(curx == COLNO) putsym('\n');
174.  	}
175.  	(void) putchar(c);
176.  }
177.  
178.  putstr(s) register char *s; {
179.  	while(*s) putsym(*s++);
180.  }