Mercurial > ecos

annotate packages/language/c/libc/stdio/current/src/input/fgets.cxx @ 208:e0c0827131d1 ecos

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Merge from eCos master repository on 2002-05-20-20:11:54-BST
author jlarmour
date Mon, 20 May 2002 22:19:26 +0000
parents b939e9cada46
children d2c90368aeef
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
1 //========================================================================
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
2 //
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
3 // fgets.cxx
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
4 //
156
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents: 115
diff changeset
5 // ISO C standard I/O fgets() function
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
6 //
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
7 //========================================================================
208
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents: 156
diff changeset
8 //####ECOSGPLCOPYRIGHTBEGIN####
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents: 156
diff changeset
9 // -------------------------------------------
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents: 156
diff changeset
10 // This file is part of eCos, the Embedded Configurable Operating System.
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents: 156
diff changeset
11 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents: 156
diff changeset
12 //
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents: 156
diff changeset
13 // eCos is free software; you can redistribute it and/or modify it under
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents: 156
diff changeset
14 // the terms of the GNU General Public License as published by the Free
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents: 156
diff changeset
15 // Software Foundation; either version 2 or (at your option) any later version.
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents: 156
diff changeset
16 //
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents: 156
diff changeset
17 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents: 156
diff changeset
18 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents: 156
diff changeset
19 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents: 156
diff changeset
20 // for more details.
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents: 156
diff changeset
21 //
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents: 156
diff changeset
22 // You should have received a copy of the GNU General Public License along
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents: 156
diff changeset
23 // with eCos; if not, write to the Free Software Foundation, Inc.,
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents: 156
diff changeset
24 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents: 156
diff changeset
25 //
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents: 156
diff changeset
26 // As a special exception, if other files instantiate templates or use macros
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents: 156
diff changeset
27 // or inline functions from this file, or you compile this file and link it
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents: 156
diff changeset
28 // with other works to produce a work based on this file, this file does not
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents: 156
diff changeset
29 // by itself cause the resulting work to be covered by the GNU General Public
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents: 156
diff changeset
30 // License. However the source code for this file must still be made available
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents: 156
diff changeset
31 // in accordance with section (3) of the GNU General Public License.
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents: 156
diff changeset
32 //
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents: 156
diff changeset
33 // This exception does not invalidate any other reasons why a work based on
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents: 156
diff changeset
34 // this file might be covered by the GNU General Public License.
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents: 156
diff changeset
35 //
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents: 156
diff changeset
36 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents: 156
diff changeset
37 // at http://sources.redhat.com/ecos/ecos-license
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents: 156
diff changeset
38 // -------------------------------------------
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents: 156
diff changeset
39 //####ECOSGPLCOPYRIGHTEND####
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
40 //========================================================================
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
41 //#####DESCRIPTIONBEGIN####
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
42 //
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
43 // Author(s): jlarmour
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
44 // Contributors:
156
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents: 115
diff changeset
45 // Date: 2001-03-14
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents: 115
diff changeset
46 // Purpose: Implementation of ISO C standard I/O fgets() function
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
47 // Description:
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
48 // Usage:
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
49 //
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
50 //####DESCRIPTIONEND####
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
51 //
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
52 //=======================================================================
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
53
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
54 // CONFIGURATION
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
55
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
56 #include <pkgconf/libc_stdio.h> // Configuration header
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
57
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
58 // INCLUDES
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
59
156
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents: 115
diff changeset
60 #include <cyg/infra/cyg_type.h> // Common type definitions
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents: 115
diff changeset
61 #include <cyg/infra/cyg_ass.h> // Assertion support
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents: 115
diff changeset
62 #include <cyg/infra/cyg_trac.h> // Tracing support
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
63 #include <stddef.h> // NULL and size_t from compiler
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
64 #include <stdio.h> // header for this file
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
65 #include <errno.h> // error codes
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
66 #include <cyg/libc/stdio/stream.hxx>// Cyg_StdioStream
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
67
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
68 // FUNCTIONS
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
69
156
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents: 115
diff changeset
70 // FIXME: should be reworked to read buffer at a time, and scan that
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents: 115
diff changeset
71 // for newlines, rather than reading byte at a time.
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents: 115
diff changeset
72
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
73 externC char *
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
74 fgets( char *s, int n, FILE *stream )
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
75 {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
76 Cyg_StdioStream *real_stream = (Cyg_StdioStream *)stream;
156
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents: 115
diff changeset
77 Cyg_ErrNo err=ENOERR;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents: 115
diff changeset
78 cyg_uint8 c;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents: 115
diff changeset
79 cyg_uint8 *str=(cyg_uint8 *)s;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents: 115
diff changeset
80 int nch;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents: 115
diff changeset
81
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents: 115
diff changeset
82 CYG_CHECK_DATA_PTRC( s );
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents: 115
diff changeset
83 CYG_CHECK_DATA_PTRC( stream );
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents: 115
diff changeset
84 CYG_PRECONDITION( n > 0, "requested 0 or negative chars");
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents: 115
diff changeset
85
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents: 115
diff changeset
86 CYG_REPORT_FUNCTYPE( "returning string %08x");
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents: 115
diff changeset
87 CYG_REPORT_FUNCARG3( "s=%08x, n=%d, stream=%08x", s, n, stream );
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
88
156
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents: 115
diff changeset
89 for (nch=1; nch < n; nch++) {
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents: 115
diff changeset
90 err = real_stream->read_byte( &c );
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents: 115
diff changeset
91
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents: 115
diff changeset
92 // if nothing to read, try again ONCE after refilling buffer
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents: 115
diff changeset
93 if (EAGAIN == err) {
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents: 115
diff changeset
94 err = real_stream->refill_read_buffer();
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents: 115
diff changeset
95 if ( !err )
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents: 115
diff changeset
96 err = real_stream->read_byte( &c );
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
97
156
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents: 115
diff changeset
98 if (EAGAIN == err) {
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents: 115
diff changeset
99 if (1 == nch) { // indicates EOF at start
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents: 115
diff changeset
100 CYG_REPORT_RETVAL( NULL );
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents: 115
diff changeset
101 return NULL;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents: 115
diff changeset
102 } else
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents: 115
diff changeset
103 break; // EOF
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents: 115
diff changeset
104 } // if
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents: 115
diff changeset
105 } // if
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents: 115
diff changeset
106
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents: 115
diff changeset
107 *str++ = c;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents: 115
diff changeset
108 if ('\n' == c)
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents: 115
diff changeset
109 break;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents: 115
diff changeset
110 } // while
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents: 115
diff changeset
111
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents: 115
diff changeset
112 *str = '\0'; // NULL terminate it
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents: 115
diff changeset
113
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents: 115
diff changeset
114 if (err && EAGAIN != err) {
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents: 115
diff changeset
115 real_stream->set_error( err );
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents: 115
diff changeset
116 errno = err;
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents: 115
diff changeset
117 CYG_REPORT_RETVAL( NULL );
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents: 115
diff changeset
118 return NULL;
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
119 } // if
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
120
156
b939e9cada46 Merge from eCos master repository on 2001-03-29-21:44:39-BST
jlarmour
parents: 115
diff changeset
121 CYG_REPORT_RETVAL( s );
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
122 return s;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
123
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
124 } // fgets()
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
125
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
126 // EOF fgets.cxx