bufio.c revision 41c30155 
1/*
2
3Copyright 1991, 1998  The Open Group
4
5Permission to use, copy, modify, distribute, and sell this software and its
6documentation for any purpose is hereby granted without fee, provided that
7the above copyright notice appear in all copies and that both that
8copyright notice and this permission notice appear in supporting
9documentation.
10
11The above copyright notice and this permission notice shall be included
12in all copies or substantial portions of the Software.
13
14THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
15OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
16MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
17IN NO EVENT SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR
18OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20OTHER DEALINGS IN THE SOFTWARE.
21
22Except as contained in this notice, the name of The Open Group shall
23not be used in advertising or otherwise to promote the sale, use or
24other dealings in this Software without prior written authorization
25from The Open Group.
26
27*/
28
29/*
30 * Author:  Keith Packard, MIT X Consortium
31 */
32
33
34#ifdef HAVE_CONFIG_H
35#include <config.h>
36#endif
37#include <X11/Xos.h>
38#include <X11/fonts/fontmisc.h>
39#include <X11/fonts/bufio.h>
40#include <errno.h>
41
42BufFilePtr
43BufFileCreate (char *private,
44	       int (*input)(BufFilePtr),
45	       int (*output)(int, BufFilePtr),
46	       int (*skip)(BufFilePtr, int),
47	       int (*close)(BufFilePtr, int))
48{
49    BufFilePtr	f;
50
51    f = malloc (sizeof *f);
52    if (!f)
53	return 0;
54    f->private = private;
55    f->bufp = f->buffer;
56    f->left = 0;
57    f->input = input;
58    f->output = output;
59    f->skip = skip;
60    f->eof  = 0;
61    f->close = close;
62    return f;
63}
64
65#define FileDes(f)  ((int)(long) (f)->private)
66
67static int
68BufFileRawFill (BufFilePtr f)
69{
70    int	left;
71
72    left = read (FileDes(f), (char *)f->buffer, BUFFILESIZE);
73    if (left <= 0) {
74	f->left = 0;
75	return BUFFILEEOF;
76    }
77    f->left = left - 1;
78    f->bufp = f->buffer + 1;
79    return f->buffer[0];
80}
81
82static int
83BufFileRawSkip (BufFilePtr f, int count)
84{
85    int	    curoff;
86    int	    fileoff;
87    int	    todo;
88
89    curoff = f->bufp - f->buffer;
90    fileoff = curoff + f->left;
91    if (curoff + count <= fileoff) {
92	f->bufp += count;
93	f->left -= count;
94    } else {
95	todo = count - (fileoff - curoff);
96	if (lseek (FileDes(f), todo, 1) == -1) {
97	    if (errno != ESPIPE)
98		return BUFFILEEOF;
99	    while (todo) {
100		curoff = BUFFILESIZE;
101		if (curoff > todo)
102		    curoff = todo;
103		fileoff = read (FileDes(f), (char *)f->buffer, curoff);
104		if (fileoff <= 0)
105		    return BUFFILEEOF;
106		todo -= fileoff;
107	    }
108	}
109	f->left = 0;
110    }
111    return count;
112}
113
114static int
115BufFileRawClose (BufFilePtr f, int doClose)
116{
117    if (doClose)
118	close (FileDes (f));
119    return 1;
120}
121
122BufFilePtr
123BufFileOpenRead (int fd)
124{
125#if defined (WIN32)
126    /* hv: I'd bet WIN32 has the same effect here */
127    setmode(fd,O_BINARY);
128#endif
129    return BufFileCreate ((char *)(long) fd, BufFileRawFill, 0, BufFileRawSkip, BufFileRawClose);
130}
131
132static int
133BufFileRawFlush (int c, BufFilePtr f)
134{
135    int	cnt;
136
137    if (c != BUFFILEEOF)
138	*f->bufp++ = c;
139    cnt = f->bufp - f->buffer;
140    f->bufp = f->buffer;
141    f->left = BUFFILESIZE;
142    if (write (FileDes(f), (char *)f->buffer, cnt) != cnt)
143	return BUFFILEEOF;
144    return c;
145}
146
147static int
148BufFileFlush (BufFilePtr f, int doClose)
149{
150    if (f->bufp != f->buffer)
151	return (*f->output) (BUFFILEEOF, f);
152    return 0;
153}
154
155BufFilePtr
156BufFileOpenWrite (int fd)
157{
158    BufFilePtr	f;
159
160#if defined(WIN32)
161    /* hv: I'd bet WIN32 has the same effect here */
162    setmode(fd,O_BINARY);
163#endif
164    f = BufFileCreate ((char *)(long) fd, 0, BufFileRawFlush, 0, BufFileFlush);
165    f->bufp = f->buffer;
166    f->left = BUFFILESIZE;
167    return f;
168}
169
170int
171BufFileRead (BufFilePtr f, char *b, int n)
172{
173    int	    c, cnt;
174    cnt = n;
175    while (cnt--) {
176	c = BufFileGet (f);
177	if (c == BUFFILEEOF)
178	    break;
179	*b++ = c;
180    }
181    return n - cnt - 1;
182}
183
184int
185BufFileWrite (BufFilePtr f, char *b, int n)
186{
187    int	    cnt;
188    cnt = n;
189    while (cnt--) {
190	if (BufFilePut (*b++, f) == BUFFILEEOF)
191	    return BUFFILEEOF;
192    }
193    return n;
194}
195
196int
197BufFileClose (BufFilePtr f, int doClose)
198{
199    int ret;
200    ret = (*f->close) (f, doClose);
201    free (f);
202    return ret;
203}
204