1 /***********************************************************************
2 * *
3 * This software is part of the ast package *
4 * Copyright (c) 1985-2011 AT&T Intellectual Property *
5 * and is licensed under the *
6 * Eclipse Public License, Version 1.0 *
7 * by AT&T Intellectual Property *
8 * *
9 * A copy of the License is available at *
10 * http://www.eclipse.org/org/documents/epl-v10.html *
11 * (with md5 checksum b35adb5213ca9657e911e9befb180842) *
12 * *
13 * Information and Software Systems Research *
14 * AT&T Research *
15 * Florham Park NJ *
16 * *
17 * Glenn Fowler <gsf@research.att.com> *
18 * David Korn <dgk@research.att.com> *
19 * Phong Vo <kpv@research.att.com> *
20 * *
21 ***********************************************************************/
22 #pragma prototyped
23 /*
24 * AT&T Research
25 *
26 * output printf prompt and read response
27 * if format==0 then verify that interaction is possible
28 *
29 * return:
30 *
31 * 0 [1yY+]
32 * -1 [qQ] or EOF
33 * 1 otherwise
34 *
35 * if (quit&ERROR_PROMPT) then tty forced for IO
36 * if quit>=0 then [qQ] or EOF calls exit(quit)
37 */
38
39 #include <ast.h>
40 #include <error.h>
41
42 int
astquery(int quit,const char * format,...)43 astquery(int quit, const char* format, ...)
44 {
45 va_list ap;
46 register int n;
47 register int c;
48 int r;
49 Sfio_t* ip;
50 Sfio_t* op;
51
52 static Sfio_t* rfp;
53 static Sfio_t* wfp;
54
55 r = 0;
56 va_start(ap, format);
57 if (!format)
58 goto done;
59 r = -1;
60 if (!rfp)
61 {
62 c = errno;
63 if (isatty(sffileno(sfstdin)))
64 rfp = sfstdin;
65 else if (!(rfp = sfopen(NiL, "/dev/tty", "r")))
66 goto done;
67 if (isatty(sffileno(sfstderr)))
68 wfp = sfstderr;
69 else if (!(wfp = sfopen(NiL, "/dev/tty", "w")))
70 goto done;
71 errno = c;
72 }
73 if (quit & ERROR_PROMPT)
74 {
75 quit &= ~ERROR_PROMPT;
76 ip = rfp;
77 op = wfp;
78 }
79 else
80 {
81 ip = sfstdin;
82 op = sfstderr;
83 }
84 sfsync(sfstdout);
85 sfvprintf(op, format, ap);
86 sfsync(op);
87 for (n = c = sfgetc(ip);; c = sfgetc(ip))
88 switch (c)
89 {
90 case EOF:
91 n = c;
92 /*FALLTHROUGH*/
93 case '\n':
94 switch (n)
95 {
96 case EOF:
97 case 'q':
98 case 'Q':
99 if (quit >= 0)
100 exit(quit);
101 goto done;
102 case '1':
103 case 'y':
104 case 'Y':
105 case '+':
106 r = 0;
107 goto done;
108 }
109 return 1;
110 }
111 done:
112 va_end(ap);
113 return r;
114 }
115