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  * standalone mini ast+sfio implementation
25  */
26 
27 #include <ast.h>
28 
29 #define CHUNK		1024
30 
31 _Ast_info_t		ast;
32 
33 int
astwinsize(int fd,int * lines,int * columns)34 astwinsize(int fd, int* lines, int* columns)
35 {
36 	if (lines)
37 		*lines = 24;
38 	if (columns)
39 		*columns = 80;
40 	return 0;
41 }
42 
43 char*
sfgetr(Sfio_t * sp,int c,int z)44 sfgetr(Sfio_t* sp, int c, int z)
45 {
46 	register char*		s;
47 	register char*		e;
48 
49 	static char*		buf;
50 	static unsigned long	siz;
51 
52 	if (!buf)
53 	{
54 		siz = CHUNK;
55 		if (!(buf = newof(0, char, siz, 0)))
56 			return 0;
57 	}
58 	if (z < 0)
59 		return *buf ? buf : (char*)0;
60 	s = buf;
61 	e = s + siz;
62 	for (;;)
63 	{
64 		if (s >= e)
65 		{
66 			siz += CHUNK;
67 			if (!(buf = newof(buf, char, siz, 0)))
68 				return 0;
69 			s = buf + (siz - CHUNK);
70 			e = s + siz;
71 		}
72 		if ((c = sfgetc(sp)) == EOF)
73 		{
74 			*s = 0;
75 			return 0;
76 		}
77 		if (c == '\n')
78 		{
79 			*s = z ? 0 : c;
80 			break;
81 		}
82 		*s++ = c;
83 	}
84 	return buf;
85 }
86