1 bc7cb1a1 2003-11-23 devnull /*
  2 bc7cb1a1 2003-11-23 devnull  * interactive diff, inspired/stolen from
  3 bc7cb1a1 2003-11-23 devnull  * kernighan and pike, _unix programming environment_.
  4 bc7cb1a1 2003-11-23 devnull  */
  5 bc7cb1a1 2003-11-23 devnull 
  6 bc7cb1a1 2003-11-23 devnull #include <u.h>
  7 bc7cb1a1 2003-11-23 devnull #include <libc.h>
  8 bc7cb1a1 2003-11-23 devnull #include <bio.h>
  9 ca0c710c 2004-03-21 devnull 
 10 bc7cb1a1 2003-11-23 devnull int diffbflag;
 11 bc7cb1a1 2003-11-23 devnull int diffwflag;
 12 bc7cb1a1 2003-11-23 devnull 
 13 bc7cb1a1 2003-11-23 devnull void copy(Biobuf*, char*, Biobuf*, char*);
 14 bc7cb1a1 2003-11-23 devnull void idiff(Biobuf*, char*, Biobuf*, char*, Biobuf*, char*, Biobuf*, char*);
 15 bc7cb1a1 2003-11-23 devnull void rundiff(char*, char*, int);
 16 bc7cb1a1 2003-11-23 devnull 
 17 bc7cb1a1 2003-11-23 devnull void
 18 bc7cb1a1 2003-11-23 devnull usage(void)
 19 bc7cb1a1 2003-11-23 devnull {
 20 bc7cb1a1 2003-11-23 devnull 	fprint(2, "usage: idiff [-bw] file1 file2\n");
 21 bc7cb1a1 2003-11-23 devnull 	exits("usage");
 22 bc7cb1a1 2003-11-23 devnull }
 23 bc7cb1a1 2003-11-23 devnull 
 24 bc7cb1a1 2003-11-23 devnull void
 25 bc7cb1a1 2003-11-23 devnull main(int argc, char **argv)
 26 bc7cb1a1 2003-11-23 devnull {
 27 bc7cb1a1 2003-11-23 devnull 	int fd, ofd;
 28 bc7cb1a1 2003-11-23 devnull 	char diffout[40], idiffout[40];
 29 bc7cb1a1 2003-11-23 devnull 	Biobuf *b1, *b2, bdiff, bout, bstdout;
 30 bc7cb1a1 2003-11-23 devnull 	Dir *d;
 31 bc7cb1a1 2003-11-23 devnull 
 32 bc7cb1a1 2003-11-23 devnull 	ARGBEGIN{
 33 bc7cb1a1 2003-11-23 devnull 	default:
 34 bc7cb1a1 2003-11-23 devnull 		usage();
 35 bc7cb1a1 2003-11-23 devnull 	case 'b':
 36 bc7cb1a1 2003-11-23 devnull 		diffbflag++;
 37 bc7cb1a1 2003-11-23 devnull 		break;
 38 bc7cb1a1 2003-11-23 devnull 	case 'w':
 39 bc7cb1a1 2003-11-23 devnull 		diffwflag++;
 40 bc7cb1a1 2003-11-23 devnull 		break;
 41 bc7cb1a1 2003-11-23 devnull 	}ARGEND
 42 bc7cb1a1 2003-11-23 devnull 
 43 bc7cb1a1 2003-11-23 devnull 	if(argc != 2)
 44 bc7cb1a1 2003-11-23 devnull 		usage();
 45 bc7cb1a1 2003-11-23 devnull 
 46 bc7cb1a1 2003-11-23 devnull 	if((d = dirstat(argv[0])) == nil)
 47 bc7cb1a1 2003-11-23 devnull 		sysfatal("stat %s: %r", argv[0]);
 48 bc7cb1a1 2003-11-23 devnull 	if(d->mode&DMDIR)
 49 bc7cb1a1 2003-11-23 devnull 		sysfatal("%s is a directory", argv[0]);
 50 bc7cb1a1 2003-11-23 devnull 	free(d);
 51 bc7cb1a1 2003-11-23 devnull 	if((d = dirstat(argv[1])) == nil)
 52 bc7cb1a1 2003-11-23 devnull 		sysfatal("stat %s: %r", argv[1]);
 53 bc7cb1a1 2003-11-23 devnull 	if(d->mode&DMDIR)
 54 bc7cb1a1 2003-11-23 devnull 		sysfatal("%s is a directory", argv[1]);
 55 bc7cb1a1 2003-11-23 devnull 	free(d);
 56 bc7cb1a1 2003-11-23 devnull 
 57 bc7cb1a1 2003-11-23 devnull 	if((b1 = Bopen(argv[0], OREAD)) == nil)
 58 bc7cb1a1 2003-11-23 devnull 		sysfatal("open %s: %r", argv[0]);
 59 bc7cb1a1 2003-11-23 devnull 	if((b2 = Bopen(argv[1], OREAD)) == nil)
 60 bc7cb1a1 2003-11-23 devnull 		sysfatal("open %s: %r", argv[1]);
 61 bc7cb1a1 2003-11-23 devnull 
 62 bc7cb1a1 2003-11-23 devnull 	strcpy(diffout, "/tmp/idiff.XXXXXX");
 63 a58a827f 2008-07-10 rsc 	fd = opentemp(diffout, ORDWR|ORCLOSE);
 64 bc7cb1a1 2003-11-23 devnull 	strcpy(idiffout, "/tmp/idiff.XXXXXX");
 65 a58a827f 2008-07-10 rsc 	ofd = opentemp(idiffout, ORDWR|ORCLOSE);
 66 bc7cb1a1 2003-11-23 devnull 	rundiff(argv[0], argv[1], fd);
 67 bc7cb1a1 2003-11-23 devnull 	seek(fd, 0, 0);
 68 bc7cb1a1 2003-11-23 devnull 	Binit(&bdiff, fd, OREAD);
 69 bc7cb1a1 2003-11-23 devnull 	Binit(&bout, ofd, OWRITE);
 70 bc7cb1a1 2003-11-23 devnull 	idiff(b1, argv[0], b2, argv[1], &bdiff, diffout, &bout, idiffout);
 71 bc7cb1a1 2003-11-23 devnull 	Bterm(&bdiff);
 72 bc7cb1a1 2003-11-23 devnull 	Bflush(&bout);
 73 bc7cb1a1 2003-11-23 devnull 	seek(ofd, 0, 0);
 74 bc7cb1a1 2003-11-23 devnull 	Binit(&bout, ofd, OREAD);
 75 bc7cb1a1 2003-11-23 devnull 	Binit(&bstdout, 1, OWRITE);
 76 bc7cb1a1 2003-11-23 devnull 	copy(&bout, idiffout, &bstdout, "<stdout>");
 77 bc7cb1a1 2003-11-23 devnull 	exits(nil);
 78 bc7cb1a1 2003-11-23 devnull }
 79 bc7cb1a1 2003-11-23 devnull 
 80 bc7cb1a1 2003-11-23 devnull void
 81 bc7cb1a1 2003-11-23 devnull rundiff(char *arg1, char *arg2, int outfd)
 82 bc7cb1a1 2003-11-23 devnull {
 83 bc7cb1a1 2003-11-23 devnull 	char *arg[10], *p;
 84 bc7cb1a1 2003-11-23 devnull 	int narg, pid;
 85 bc7cb1a1 2003-11-23 devnull 	Waitmsg *w;
 86 bc7cb1a1 2003-11-23 devnull 
 87 bc7cb1a1 2003-11-23 devnull 	narg = 0;
 88 fcb69ec5 2005-07-14 devnull 	arg[narg++] = "9";
 89 b4a659b6 2004-04-19 devnull 	arg[narg++] = "diff";
 90 bc7cb1a1 2003-11-23 devnull 	arg[narg++] = "-n";
 91 bc7cb1a1 2003-11-23 devnull 	if(diffbflag)
 92 bc7cb1a1 2003-11-23 devnull 		arg[narg++] = "-b";
 93 bc7cb1a1 2003-11-23 devnull 	if(diffwflag)
 94 bc7cb1a1 2003-11-23 devnull 		arg[narg++] = "-w";
 95 bc7cb1a1 2003-11-23 devnull 	arg[narg++] = arg1;
 96 bc7cb1a1 2003-11-23 devnull 	arg[narg++] = arg2;
 97 bc7cb1a1 2003-11-23 devnull 	arg[narg] = nil;
 98 bc7cb1a1 2003-11-23 devnull 
 99 bc7cb1a1 2003-11-23 devnull 	switch(pid = fork()){
100 bc7cb1a1 2003-11-23 devnull 	case -1:
101 bc7cb1a1 2003-11-23 devnull 		sysfatal("fork: %r");
102 bc7cb1a1 2003-11-23 devnull 
103 bc7cb1a1 2003-11-23 devnull 	case 0:
104 bc7cb1a1 2003-11-23 devnull 		dup(outfd, 1);
105 bc7cb1a1 2003-11-23 devnull 		close(0);
106 fcb69ec5 2005-07-14 devnull 		exec("9", arg);
107 bc7cb1a1 2003-11-23 devnull 		sysfatal("exec: %r");
108 bc7cb1a1 2003-11-23 devnull 
109 bc7cb1a1 2003-11-23 devnull 	default:
110 bc7cb1a1 2003-11-23 devnull 		w = wait();
111 bc7cb1a1 2003-11-23 devnull 		if(w==nil)
112 bc7cb1a1 2003-11-23 devnull 			sysfatal("wait: %r");
113 bc7cb1a1 2003-11-23 devnull 		if(w->pid != pid)
114 bc7cb1a1 2003-11-23 devnull 			sysfatal("wait got unexpected pid %d", w->pid);
115 bc7cb1a1 2003-11-23 devnull 		if((p = strchr(w->msg, ':')) && strcmp(p, ": some") != 0)
116 bc7cb1a1 2003-11-23 devnull 			sysfatal("%s", w->msg);
117 bc7cb1a1 2003-11-23 devnull 		free(w);
118 bc7cb1a1 2003-11-23 devnull 	}
119 bc7cb1a1 2003-11-23 devnull }
120 bc7cb1a1 2003-11-23 devnull 
121 bc7cb1a1 2003-11-23 devnull void
122 bc7cb1a1 2003-11-23 devnull runcmd(char *cmd)
123 bc7cb1a1 2003-11-23 devnull {
124 bc7cb1a1 2003-11-23 devnull 	char *arg[10];
125 bc7cb1a1 2003-11-23 devnull 	int narg, pid, wpid;
126 bc7cb1a1 2003-11-23 devnull 
127 bc7cb1a1 2003-11-23 devnull 	narg = 0;
128 b4a659b6 2004-04-19 devnull 	arg[narg++] = "rc";
129 bc7cb1a1 2003-11-23 devnull 	arg[narg++] = "-c";
130 bc7cb1a1 2003-11-23 devnull 	arg[narg++] = cmd;
131 bc7cb1a1 2003-11-23 devnull 	arg[narg] = nil;
132 bc7cb1a1 2003-11-23 devnull 
133 bc7cb1a1 2003-11-23 devnull 	switch(pid = fork()){
134 bc7cb1a1 2003-11-23 devnull 	case -1:
135 bc7cb1a1 2003-11-23 devnull 		sysfatal("fork: %r");
136 bc7cb1a1 2003-11-23 devnull 
137 bc7cb1a1 2003-11-23 devnull 	case 0:
138 b4a659b6 2004-04-19 devnull 		exec("rc", arg);
139 bc7cb1a1 2003-11-23 devnull 		sysfatal("exec: %r");
140 bc7cb1a1 2003-11-23 devnull 
141 bc7cb1a1 2003-11-23 devnull 	default:
142 bc7cb1a1 2003-11-23 devnull 		wpid = waitpid();
143 bc7cb1a1 2003-11-23 devnull 		if(wpid < 0)
144 bc7cb1a1 2003-11-23 devnull 			sysfatal("wait: %r");
145 bc7cb1a1 2003-11-23 devnull 		if(wpid != pid)
146 bc7cb1a1 2003-11-23 devnull 			sysfatal("wait got unexpected pid %d", wpid);
147 bc7cb1a1 2003-11-23 devnull 	}
148 bc7cb1a1 2003-11-23 devnull }
149 bc7cb1a1 2003-11-23 devnull 
150 bc7cb1a1 2003-11-23 devnull void
151 bc7cb1a1 2003-11-23 devnull parse(char *s, int *pfrom1, int *pto1, int *pcmd, int *pfrom2, int *pto2)
152 bc7cb1a1 2003-11-23 devnull {
153 bc7cb1a1 2003-11-23 devnull 	*pfrom1 = *pto1 = *pfrom2 = *pto2 = 0;
154 bc7cb1a1 2003-11-23 devnull 
155 bc7cb1a1 2003-11-23 devnull 	s = strchr(s, ':');
156 bc7cb1a1 2003-11-23 devnull 	if(s == nil)
157 bc7cb1a1 2003-11-23 devnull 		sysfatal("bad diff output0");
158 bc7cb1a1 2003-11-23 devnull 	s++;
159 bc7cb1a1 2003-11-23 devnull 	*pfrom1 = strtol(s, &s, 10);
160 bc7cb1a1 2003-11-23 devnull 	if(*s == ','){
161 bc7cb1a1 2003-11-23 devnull 		s++;
162 bc7cb1a1 2003-11-23 devnull 		*pto1 = strtol(s, &s, 10);
163 bc7cb1a1 2003-11-23 devnull 	}else
164 bc7cb1a1 2003-11-23 devnull 		*pto1 = *pfrom1;
165 bc7cb1a1 2003-11-23 devnull 	if(*s++ != ' ')
166 bc7cb1a1 2003-11-23 devnull 		sysfatal("bad diff output1");
167 bc7cb1a1 2003-11-23 devnull 	*pcmd = *s++;
168 bc7cb1a1 2003-11-23 devnull 	if(*s++ != ' ')
169 bc7cb1a1 2003-11-23 devnull 		sysfatal("bad diff output2");
170 bc7cb1a1 2003-11-23 devnull 	s = strchr(s, ':');
171 bc7cb1a1 2003-11-23 devnull 	if(s == nil)
172 bc7cb1a1 2003-11-23 devnull 		sysfatal("bad diff output3");
173 bc7cb1a1 2003-11-23 devnull 	s++;
174 bc7cb1a1 2003-11-23 devnull 	*pfrom2 = strtol(s, &s, 10);
175 bc7cb1a1 2003-11-23 devnull 	if(*s == ','){
176 bc7cb1a1 2003-11-23 devnull 		s++;
177 bc7cb1a1 2003-11-23 devnull 		*pto2 = strtol(s, &s, 10);
178 bc7cb1a1 2003-11-23 devnull 	}else
179 bc7cb1a1 2003-11-23 devnull 		*pto2 = *pfrom2;
180 bc7cb1a1 2003-11-23 devnull }
181 bc7cb1a1 2003-11-23 devnull 
182 bc7cb1a1 2003-11-23 devnull void
183 bc7cb1a1 2003-11-23 devnull skiplines(Biobuf *b, char *name, int n)
184 bc7cb1a1 2003-11-23 devnull {
185 bc7cb1a1 2003-11-23 devnull 	int i;
186 bc7cb1a1 2003-11-23 devnull 
187 bc7cb1a1 2003-11-23 devnull 	for(i=0; i<n; i++){
188 bc7cb1a1 2003-11-23 devnull 		while(Brdline(b, '\n')==nil){
189 bc7cb1a1 2003-11-23 devnull 			if(Blinelen(b) <= 0)
190 bc7cb1a1 2003-11-23 devnull 				sysfatal("early end of file on %s", name);
191 bc7cb1a1 2003-11-23 devnull 			Bseek(b, Blinelen(b), 1);
192 bc7cb1a1 2003-11-23 devnull 		}
193 bc7cb1a1 2003-11-23 devnull 	}
194 bc7cb1a1 2003-11-23 devnull }
195 bc7cb1a1 2003-11-23 devnull 
196 bc7cb1a1 2003-11-23 devnull void
197 bc7cb1a1 2003-11-23 devnull copylines(Biobuf *bin, char *nin, Biobuf *bout, char *nout, int n)
198 bc7cb1a1 2003-11-23 devnull {
199 bc7cb1a1 2003-11-23 devnull 	char buf[4096], *p;
200 bc7cb1a1 2003-11-23 devnull 	int i, m;
201 bc7cb1a1 2003-11-23 devnull 
202 bc7cb1a1 2003-11-23 devnull 	for(i=0; i<n; i++){
203 bc7cb1a1 2003-11-23 devnull 		while((p=Brdline(bin, '\n'))==nil){
204 bc7cb1a1 2003-11-23 devnull 			if(Blinelen(bin) <= 0)
205 bc7cb1a1 2003-11-23 devnull 				sysfatal("early end of file on %s", nin);
206 bc7cb1a1 2003-11-23 devnull 			m = Blinelen(bin);
207 bc7cb1a1 2003-11-23 devnull 			if(m > sizeof buf)
208 bc7cb1a1 2003-11-23 devnull 				m = sizeof buf;
209 bc7cb1a1 2003-11-23 devnull 			m = Bread(bin, buf, m);
210 bc7cb1a1 2003-11-23 devnull 			if(Bwrite(bout, buf, m) != m)
211 bc7cb1a1 2003-11-23 devnull 				sysfatal("error writing %s: %r", nout);
212 bc7cb1a1 2003-11-23 devnull 		}
213 bc7cb1a1 2003-11-23 devnull 		if(Bwrite(bout, p, Blinelen(bin)) != Blinelen(bin))
214 bc7cb1a1 2003-11-23 devnull 			sysfatal("error writing %s: %r", nout);
215 bc7cb1a1 2003-11-23 devnull 	}
216 bc7cb1a1 2003-11-23 devnull }
217 bc7cb1a1 2003-11-23 devnull 
218 bc7cb1a1 2003-11-23 devnull void
219 bc7cb1a1 2003-11-23 devnull copy(Biobuf *bin, char *nin, Biobuf *bout, char *nout)
220 bc7cb1a1 2003-11-23 devnull {
221 bc7cb1a1 2003-11-23 devnull 	char buf[4096];
222 bc7cb1a1 2003-11-23 devnull 	int m;
223 bc7cb1a1 2003-11-23 devnull 
224 bc7cb1a1 2003-11-23 devnull 	USED(nin);
225 bc7cb1a1 2003-11-23 devnull 	while((m = Bread(bin, buf, sizeof buf)) > 0)
226 bc7cb1a1 2003-11-23 devnull 		if(Bwrite(bout, buf, m) != m)
227 bc7cb1a1 2003-11-23 devnull 			sysfatal("error writing %s: %r", nout);
228 bc7cb1a1 2003-11-23 devnull }
229 bc7cb1a1 2003-11-23 devnull 
230 bc7cb1a1 2003-11-23 devnull void
231 bc7cb1a1 2003-11-23 devnull idiff(Biobuf *b1, char *name1, Biobuf *b2, char *name2, Biobuf *bdiff, char *namediff, Biobuf *bout, char *nameout)
232 bc7cb1a1 2003-11-23 devnull {
233 bc7cb1a1 2003-11-23 devnull 	char buf[256], *p;
234 bc7cb1a1 2003-11-23 devnull 	int interactive, defaultanswer, cmd, diffoffset;
235 bc7cb1a1 2003-11-23 devnull 	int n, from1, to1, from2, to2, nf1, nf2;
236 bc7cb1a1 2003-11-23 devnull 	Biobuf berr;
237 bc7cb1a1 2003-11-23 devnull 
238 bc7cb1a1 2003-11-23 devnull 	nf1 = 1;
239 bc7cb1a1 2003-11-23 devnull 	nf2 = 1;
240 bc7cb1a1 2003-11-23 devnull 	interactive = 1;
241 bc7cb1a1 2003-11-23 devnull 	defaultanswer = 0;
242 bc7cb1a1 2003-11-23 devnull 	Binit(&berr, 2, OWRITE);
243 bc7cb1a1 2003-11-23 devnull 	while(diffoffset = Boffset(bdiff), p = Brdline(bdiff, '\n')){
244 bc7cb1a1 2003-11-23 devnull 		p[Blinelen(bdiff)-1] = '\0';
245 bc7cb1a1 2003-11-23 devnull 		parse(p, &from1, &to1, &cmd, &from2, &to2);
246 bc7cb1a1 2003-11-23 devnull 		p[Blinelen(bdiff)-1] = '\n';
247 bc7cb1a1 2003-11-23 devnull 		n = to1-from1 + to2-from2 + 1;	/* #lines from diff */
248 bc7cb1a1 2003-11-23 devnull 		if(cmd == 'c')
249 bc7cb1a1 2003-11-23 devnull 			n += 2;
250 bc7cb1a1 2003-11-23 devnull 		else if(cmd == 'a')
251 bc7cb1a1 2003-11-23 devnull 			from1++;
252 bc7cb1a1 2003-11-23 devnull 		else if(cmd == 'd')
253 bc7cb1a1 2003-11-23 devnull 			from2++;
254 bc7cb1a1 2003-11-23 devnull 		to1++;	/* make half-open intervals */
255 bc7cb1a1 2003-11-23 devnull 		to2++;
256 bc7cb1a1 2003-11-23 devnull 		if(interactive){
257 bc7cb1a1 2003-11-23 devnull 			p[Blinelen(bdiff)-1] = '\0';
258 bc7cb1a1 2003-11-23 devnull 			fprint(2, "%s\n", p);
259 bc7cb1a1 2003-11-23 devnull 			p[Blinelen(bdiff)-1] = '\n';
260 bc7cb1a1 2003-11-23 devnull 			copylines(bdiff, namediff, &berr, "<stderr>", n);
261 bc7cb1a1 2003-11-23 devnull 			Bflush(&berr);
262 bc7cb1a1 2003-11-23 devnull 		}else
263 bc7cb1a1 2003-11-23 devnull 			skiplines(bdiff, namediff, n);
264 bc7cb1a1 2003-11-23 devnull 		do{
265 bc7cb1a1 2003-11-23 devnull 			if(interactive){
266 bc7cb1a1 2003-11-23 devnull 				fprint(2, "? ");
267 bc7cb1a1 2003-11-23 devnull 				memset(buf, 0, sizeof buf);
268 bc7cb1a1 2003-11-23 devnull 				if(read(0, buf, sizeof buf - 1) < 0)
269 bc7cb1a1 2003-11-23 devnull 					sysfatal("read console: %r");
270 bc7cb1a1 2003-11-23 devnull 			}else
271 bc7cb1a1 2003-11-23 devnull 				buf[0] = defaultanswer;
272 bc7cb1a1 2003-11-23 devnull 
273 bc7cb1a1 2003-11-23 devnull 			switch(buf[0]){
274 bc7cb1a1 2003-11-23 devnull 			case '>':
275 bc7cb1a1 2003-11-23 devnull 				copylines(b1, name1, bout, nameout, from1-nf1);
276 bc7cb1a1 2003-11-23 devnull 				skiplines(b1, name1, to1-from1);
277 bc7cb1a1 2003-11-23 devnull 				skiplines(b2, name2, from2-nf2);
278 bc7cb1a1 2003-11-23 devnull 				copylines(b2, name2, bout, nameout, to2-from2);
279 bc7cb1a1 2003-11-23 devnull 				break;
280 bc7cb1a1 2003-11-23 devnull 			case '<':
281 bc7cb1a1 2003-11-23 devnull 				copylines(b1, name1, bout, nameout, to1-nf1);
282 bc7cb1a1 2003-11-23 devnull 				skiplines(b2, name2, to2-nf2);
283 bc7cb1a1 2003-11-23 devnull 				break;
284 bc7cb1a1 2003-11-23 devnull 			case '=':
285 bc7cb1a1 2003-11-23 devnull 				copylines(b1, name1, bout, nameout, from1-nf1);
286 bc7cb1a1 2003-11-23 devnull 				skiplines(b1, name1, to1-from1);
287 bc7cb1a1 2003-11-23 devnull 				skiplines(b2, name2, to2-nf2);
288 bc7cb1a1 2003-11-23 devnull 				if(Bseek(bdiff, diffoffset, 0) != diffoffset)
289 bc7cb1a1 2003-11-23 devnull 					sysfatal("seek in diff output: %r");
290 bc7cb1a1 2003-11-23 devnull 				copylines(bdiff, namediff, bout, nameout, n+1);
291 bc7cb1a1 2003-11-23 devnull 				break;
292 bc7cb1a1 2003-11-23 devnull 			case '!':
293 bc7cb1a1 2003-11-23 devnull 				runcmd(buf+1);
294 bc7cb1a1 2003-11-23 devnull 				break;
295 bc7cb1a1 2003-11-23 devnull 			case 'q':
296 bc7cb1a1 2003-11-23 devnull 				if(buf[1]=='<' || buf[1]=='>' || buf[1]=='='){
297 bc7cb1a1 2003-11-23 devnull 					interactive = 0;
298 bc7cb1a1 2003-11-23 devnull 					defaultanswer = buf[1];
299 bc7cb1a1 2003-11-23 devnull 				}else
300 bc7cb1a1 2003-11-23 devnull 					fprint(2, "must be q<, q>, or q=\n");
301 bc7cb1a1 2003-11-23 devnull 				break;
302 bc7cb1a1 2003-11-23 devnull 			default:
303 bc7cb1a1 2003-11-23 devnull 				fprint(2, "expect: <, >, =, q<, q>, q=, !cmd\n");
304 bc7cb1a1 2003-11-23 devnull 				break;
305 bc7cb1a1 2003-11-23 devnull 			}
306 bc7cb1a1 2003-11-23 devnull 		}while(buf[0] != '<' && buf[0] != '>' && buf[0] != '=');
307 bc7cb1a1 2003-11-23 devnull 		nf1 = to1;
308 bc7cb1a1 2003-11-23 devnull 		nf2 = to2;
309 bc7cb1a1 2003-11-23 devnull 	}
310 bc7cb1a1 2003-11-23 devnull 	copy(b1, name1, bout, nameout);
311 bc7cb1a1 2003-11-23 devnull }