]>
Commit | Line | Data |
---|---|---|
b79f73df | 1 | /* Implement Input/Output runtime actions for CHILL. |
d670fb27 | 2 | Copyright (C) 1992, 1993, 1998 Free Software Foundation, Inc. |
b79f73df JL |
3 | Author: Wilfried Moser, et al |
4 | ||
5 | This file is part of GNU CC. | |
6 | ||
7 | GNU CC is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2, or (at your option) | |
10 | any later version. | |
11 | ||
12 | GNU CC is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with GNU CC; see the file COPYING. If not, write to | |
201853b4 JL |
19 | the Free Software Foundation, 59 Temple Place - Suite 330, |
20 | Boston, MA 02111-1307, USA. */ | |
b79f73df | 21 | |
502b941f JL |
22 | /* As a special exception, if you link this library with other files, |
23 | some of which are compiled with GCC, to produce an executable, | |
24 | this library does not by itself cause the resulting executable | |
25 | to be covered by the GNU General Public License. | |
26 | This exception does not however invalidate any other reasons why | |
27 | the executable file might be covered by the GNU General Public License. */ | |
28 | ||
b79f73df JL |
29 | #include <setjmp.h> |
30 | #include <stdlib.h> | |
31 | #include <errno.h> | |
d670fb27 | 32 | #include <sys/types.h> |
b79f73df JL |
33 | #include <unistd.h> |
34 | ||
35 | #include "fileio.h" | |
36 | ||
37 | #ifdef EOF | |
38 | #undef EOF | |
39 | #endif | |
40 | #define EOF -1 | |
41 | ||
42 | static | |
43 | Boolean | |
44 | doRead( Access_Mode* the_access, void* buf, size_t nbyte ) | |
45 | { | |
46 | size_t nread; | |
47 | ||
48 | nread = read( the_access->association->handle, buf, nbyte ); | |
49 | if( nread == nbyte ) | |
50 | { | |
51 | CLR_FLAG( the_access, IO_OUTOFFILE ); | |
52 | return True; | |
53 | } | |
54 | if( nread == 0 ) | |
55 | { | |
56 | SET_FLAG( the_access, IO_OUTOFFILE ); | |
57 | return False; | |
58 | } | |
59 | the_access->association->syserrno = errno; | |
60 | RWEXCEPTION( READFAIL, OS_IO_ERROR ); | |
61 | /* no return */ | |
62 | } | |
63 | ||
64 | static | |
65 | int bgetc( int handle, readbuf_t* rbptr ) | |
66 | { | |
67 | if( rbptr->cur >= rbptr->len ) | |
68 | { | |
69 | rbptr->len = read( handle, rbptr->buf, READBUFLEN ); | |
70 | if( rbptr->len == 0 ) | |
71 | return EOF; | |
72 | rbptr->cur = 0; | |
73 | } | |
74 | return rbptr->buf[rbptr->cur++]; | |
75 | } | |
76 | ||
77 | static | |
78 | void bungetc( readbuf_t* rbptr, int c ) | |
79 | { | |
80 | rbptr->buf[--rbptr->cur] = c; | |
81 | } | |
82 | ||
83 | void* | |
84 | __readrecord( Access_Mode* the_access, | |
85 | signed long the_index, | |
86 | char* the_buf_addr, | |
87 | char* file, | |
88 | int line ) | |
89 | { | |
90 | unsigned long info; | |
91 | char* actaddr; | |
92 | unsigned short actlen; | |
93 | off_t filepos; | |
94 | unsigned short reclen; | |
95 | unsigned long readlen; | |
96 | ||
97 | if( !the_access ) | |
98 | CHILLEXCEPTION( file, line, EMPTY, NULL_ACCESS ); | |
99 | ||
100 | if( !the_access->association ) | |
101 | CHILLEXCEPTION( file, line, NOTCONNECTED, IS_NOT_CONNECTED ); | |
102 | ||
103 | /* Usage must not be WriteOnly */ | |
104 | if( the_access->association->usage == WriteOnly ) | |
105 | CHILLEXCEPTION( file, line, READFAIL, BAD_USAGE ); | |
106 | ||
107 | /* OUTOFFILE must not be True when connected for sequential read */ | |
108 | if( !TEST_FLAG( the_access, IO_INDEXED ) | |
109 | && TEST_FLAG( the_access, IO_OUTOFFILE ) ) | |
110 | CHILLEXCEPTION( file, line, READFAIL, OUT_OF_FILE ); | |
111 | ||
112 | /* | |
113 | * Positioning | |
114 | */ | |
115 | if( TEST_FLAG( the_access, IO_INDEXED ) ) | |
116 | { | |
117 | /* index expression must be within bounds of index mode */ | |
118 | if( the_index < the_access->lowindex | |
119 | || the_access->highindex < the_index ) | |
120 | CHILLEXCEPTION( file, line, RANGEFAIL, BAD_INDEX ); | |
121 | ||
122 | filepos = the_access->base + | |
123 | (the_index - the_access->lowindex) * the_access->reclength; | |
124 | ||
125 | if( lseek( the_access->association->handle, filepos, SEEK_SET ) == -1L ) | |
126 | CHILLEXCEPTION( file, line, READFAIL, LSEEK_FAILS ); | |
127 | } | |
128 | ||
129 | /* establish store loc */ | |
130 | if( !(actaddr = the_buf_addr )) | |
131 | { | |
132 | /* if not yet allocated, do it now */ | |
133 | if (!the_access->store_loc) | |
134 | if( !(the_access->store_loc = (char*)malloc( the_access->reclength ) ) ) | |
135 | CHILLEXCEPTION( file, line, SPACEFAIL, STORE_LOC_ALLOC ); | |
136 | actaddr = the_access->store_loc; | |
137 | } | |
138 | actlen = the_access->reclength; | |
139 | ||
140 | if( (info = setjmp( __rw_exception )) ) | |
141 | CHILLEXCEPTION( file, line, info>>16, info & 0xffff ); | |
142 | ||
143 | if( TEST_FLAG( the_access, IO_TEXTIO ) ) | |
144 | { | |
145 | readlen = actlen - 2; | |
146 | if( TEST_FLAG( the_access, IO_INDEXED ) ) | |
147 | { | |
148 | if( ! doRead( the_access, &reclen, sizeof(reclen) ) ) | |
149 | return NULL; | |
150 | if( reclen > readlen ) | |
151 | CHILLEXCEPTION( file, line, RANGEFAIL, RECORD_TOO_LONG ); | |
152 | if( ! doRead( the_access, actaddr + 2, reclen ) ) | |
153 | CHILLEXCEPTION( file, line, READFAIL, RECORD_TOO_SHORT ); | |
154 | } | |
155 | else | |
156 | { | |
157 | Association_Mode *assoc = the_access->association; | |
158 | int handle = assoc->handle; | |
159 | readbuf_t* rbuf = assoc->bufptr; | |
160 | char* cptr = actaddr+2; | |
161 | int curr; | |
162 | ||
163 | reclen = 0; | |
164 | while( readlen-- ) | |
165 | { | |
166 | curr = bgetc( handle, rbuf ); | |
167 | if( curr == '\n' ) | |
168 | goto end_of_line; | |
169 | if( curr == EOF ) | |
170 | { | |
171 | if( !reclen ) | |
172 | SET_FLAG( the_access, IO_OUTOFFILE ); | |
173 | goto end_of_line; | |
174 | } | |
175 | *cptr++ = curr; | |
176 | reclen++; | |
177 | } | |
178 | if( (curr = bgetc( handle, rbuf )) != '\n' ) | |
179 | { | |
180 | bungetc( rbuf, curr ); | |
181 | CHILLEXCEPTION( file, line, RANGEFAIL, RECORD_TOO_LONG ); | |
182 | } | |
183 | end_of_line: ; | |
184 | } | |
185 | MOV2(actaddr,&reclen); | |
186 | } | |
187 | else | |
188 | { | |
189 | switch( the_access->rectype ) | |
190 | { | |
191 | case Fixed: | |
192 | if( ! doRead( the_access, actaddr, actlen ) ) | |
193 | return NULL; | |
194 | break; | |
195 | case VaryingChars: | |
196 | if( TEST_FLAG( the_access->association, IO_VARIABLE ) ) | |
197 | { | |
198 | if( ! doRead( the_access, &reclen, sizeof(reclen) ) ) | |
199 | return NULL; | |
200 | if( reclen > actlen - 2 ) | |
201 | CHILLEXCEPTION( file, line, RANGEFAIL, RECORD_TOO_LONG ); | |
202 | readlen = TEST_FLAG( the_access, IO_INDEXED ) ? actlen - 2 : reclen; | |
203 | if( ! doRead( the_access, actaddr + 2, readlen ) ) | |
204 | CHILLEXCEPTION( file, line, READFAIL, RECORD_TOO_SHORT ); | |
205 | } | |
206 | else | |
207 | { | |
208 | if( ! doRead( the_access, actaddr + 2, reclen = actlen - 2 ) ) | |
209 | CHILLEXCEPTION( file, line, READFAIL, RECORD_TOO_SHORT ); | |
210 | } | |
211 | MOV2(actaddr,&reclen); | |
212 | break; | |
213 | } | |
214 | } | |
215 | ||
216 | return actaddr; | |
217 | } |