1*4887Schin /*********************************************************************** 2*4887Schin * * 3*4887Schin * This software is part of the ast package * 4*4887Schin * Copyright (c) 1985-2007 AT&T Knowledge Ventures * 5*4887Schin * and is licensed under the * 6*4887Schin * Common Public License, Version 1.0 * 7*4887Schin * by AT&T Knowledge Ventures * 8*4887Schin * * 9*4887Schin * A copy of the License is available at * 10*4887Schin * http://www.opensource.org/licenses/cpl1.0.txt * 11*4887Schin * (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) * 12*4887Schin * * 13*4887Schin * Information and Software Systems Research * 14*4887Schin * AT&T Research * 15*4887Schin * Florham Park NJ * 16*4887Schin * * 17*4887Schin * Glenn Fowler <gsf@research.att.com> * 18*4887Schin * David Korn <dgk@research.att.com> * 19*4887Schin * Phong Vo <kpv@research.att.com> * 20*4887Schin * * 21*4887Schin ***********************************************************************/ 22*4887Schin #pragma prototyped 23*4887Schin /* 24*4887Schin * AT&T Research 25*4887Schin * 26*4887Schin * output printf prompt and read response 27*4887Schin * if format==0 then verify that interaction is possible 28*4887Schin * 29*4887Schin * return: 30*4887Schin * 31*4887Schin * 0 [1yY+] 32*4887Schin * -1 [qQ] or EOF 33*4887Schin * 1 otherwise 34*4887Schin * 35*4887Schin * if (quit&ERROR_PROMPT) then tty forced for IO 36*4887Schin * if quit>=0 then [qQ] or EOF calls exit(quit) 37*4887Schin */ 38*4887Schin 39*4887Schin #include <ast.h> 40*4887Schin #include <error.h> 41*4887Schin 42*4887Schin int 43*4887Schin astquery(int quit, const char* format, ...) 44*4887Schin { 45*4887Schin va_list ap; 46*4887Schin register int n; 47*4887Schin register int c; 48*4887Schin Sfio_t* ip; 49*4887Schin Sfio_t* op; 50*4887Schin 51*4887Schin static Sfio_t* rfp; 52*4887Schin static Sfio_t* wfp; 53*4887Schin 54*4887Schin va_start(ap, format); 55*4887Schin if (!format) 56*4887Schin return 0; 57*4887Schin if (!rfp) 58*4887Schin { 59*4887Schin c = errno; 60*4887Schin if (isatty(sffileno(sfstdin))) 61*4887Schin rfp = sfstdin; 62*4887Schin else if (!(rfp = sfopen(NiL, "/dev/tty", "r"))) 63*4887Schin return -1; 64*4887Schin if (isatty(sffileno(sfstderr))) 65*4887Schin wfp = sfstderr; 66*4887Schin else if (!(wfp = sfopen(NiL, "/dev/tty", "w"))) 67*4887Schin return -1; 68*4887Schin errno = c; 69*4887Schin } 70*4887Schin if (quit & ERROR_PROMPT) 71*4887Schin { 72*4887Schin quit &= ~ERROR_PROMPT; 73*4887Schin ip = rfp; 74*4887Schin op = wfp; 75*4887Schin } 76*4887Schin else 77*4887Schin { 78*4887Schin ip = sfstdin; 79*4887Schin op = sfstderr; 80*4887Schin } 81*4887Schin sfsync(sfstdout); 82*4887Schin sfvprintf(op, format, ap); 83*4887Schin sfsync(op); 84*4887Schin for (n = c = sfgetc(ip);; c = sfgetc(ip)) 85*4887Schin switch (c) 86*4887Schin { 87*4887Schin case EOF: 88*4887Schin n = c; 89*4887Schin /*FALLTHROUGH*/ 90*4887Schin case '\n': 91*4887Schin switch (n) 92*4887Schin { 93*4887Schin case EOF: 94*4887Schin case 'q': 95*4887Schin case 'Q': 96*4887Schin if (quit >= 0) 97*4887Schin exit(quit); 98*4887Schin return -1; 99*4887Schin case '1': 100*4887Schin case 'y': 101*4887Schin case 'Y': 102*4887Schin case '+': 103*4887Schin return 0; 104*4887Schin } 105*4887Schin return 1; 106*4887Schin } 107*4887Schin va_end(ap); 108*4887Schin /*NOTREACHED*/ 109*4887Schin } 110