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b79f73df JL |
1 | /* Implement Input/Output runtime actions for CHILL. |
2 | Copyright (C) 1992,1993 Free Software Foundation, Inc. | |
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 | |
19 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
20 | ||
502b941f JL |
21 | /* As a special exception, if you link this library with other files, |
22 | some of which are compiled with GCC, to produce an executable, | |
23 | this library does not by itself cause the resulting executable | |
24 | to be covered by the GNU General Public License. | |
25 | This exception does not however invalidate any other reasons why | |
26 | the executable file might be covered by the GNU General Public License. */ | |
27 | ||
b79f73df JL |
28 | #include <setjmp.h> |
29 | #include <stdlib.h> | |
30 | #include <errno.h> | |
31 | #include <unistd.h> | |
32 | ||
33 | #include "fileio.h" | |
34 | ||
35 | #ifdef EOF | |
36 | #undef EOF | |
37 | #endif | |
38 | #define EOF -1 | |
39 | ||
40 | static | |
41 | Boolean | |
42 | doRead( Access_Mode* the_access, void* buf, size_t nbyte ) | |
43 | { | |
44 | size_t nread; | |
45 | ||
46 | nread = read( the_access->association->handle, buf, nbyte ); | |
47 | if( nread == nbyte ) | |
48 | { | |
49 | CLR_FLAG( the_access, IO_OUTOFFILE ); | |
50 | return True; | |
51 | } | |
52 | if( nread == 0 ) | |
53 | { | |
54 | SET_FLAG( the_access, IO_OUTOFFILE ); | |
55 | return False; | |
56 | } | |
57 | the_access->association->syserrno = errno; | |
58 | RWEXCEPTION( READFAIL, OS_IO_ERROR ); | |
59 | /* no return */ | |
60 | } | |
61 | ||
62 | static | |
63 | int bgetc( int handle, readbuf_t* rbptr ) | |
64 | { | |
65 | if( rbptr->cur >= rbptr->len ) | |
66 | { | |
67 | rbptr->len = read( handle, rbptr->buf, READBUFLEN ); | |
68 | if( rbptr->len == 0 ) | |
69 | return EOF; | |
70 | rbptr->cur = 0; | |
71 | } | |
72 | return rbptr->buf[rbptr->cur++]; | |
73 | } | |
74 | ||
75 | static | |
76 | void bungetc( readbuf_t* rbptr, int c ) | |
77 | { | |
78 | rbptr->buf[--rbptr->cur] = c; | |
79 | } | |
80 | ||
81 | void* | |
82 | __readrecord( Access_Mode* the_access, | |
83 | signed long the_index, | |
84 | char* the_buf_addr, | |
85 | char* file, | |
86 | int line ) | |
87 | { | |
88 | unsigned long info; | |
89 | char* actaddr; | |
90 | unsigned short actlen; | |
91 | off_t filepos; | |
92 | unsigned short reclen; | |
93 | unsigned long readlen; | |
94 | ||
95 | if( !the_access ) | |
96 | CHILLEXCEPTION( file, line, EMPTY, NULL_ACCESS ); | |
97 | ||
98 | if( !the_access->association ) | |
99 | CHILLEXCEPTION( file, line, NOTCONNECTED, IS_NOT_CONNECTED ); | |
100 | ||
101 | /* Usage must not be WriteOnly */ | |
102 | if( the_access->association->usage == WriteOnly ) | |
103 | CHILLEXCEPTION( file, line, READFAIL, BAD_USAGE ); | |
104 | ||
105 | /* OUTOFFILE must not be True when connected for sequential read */ | |
106 | if( !TEST_FLAG( the_access, IO_INDEXED ) | |
107 | && TEST_FLAG( the_access, IO_OUTOFFILE ) ) | |
108 | CHILLEXCEPTION( file, line, READFAIL, OUT_OF_FILE ); | |
109 | ||
110 | /* | |
111 | * Positioning | |
112 | */ | |
113 | if( TEST_FLAG( the_access, IO_INDEXED ) ) | |
114 | { | |
115 | /* index expression must be within bounds of index mode */ | |
116 | if( the_index < the_access->lowindex | |
117 | || the_access->highindex < the_index ) | |
118 | CHILLEXCEPTION( file, line, RANGEFAIL, BAD_INDEX ); | |
119 | ||
120 | filepos = the_access->base + | |
121 | (the_index - the_access->lowindex) * the_access->reclength; | |
122 | ||
123 | if( lseek( the_access->association->handle, filepos, SEEK_SET ) == -1L ) | |
124 | CHILLEXCEPTION( file, line, READFAIL, LSEEK_FAILS ); | |
125 | } | |
126 | ||
127 | /* establish store loc */ | |
128 | if( !(actaddr = the_buf_addr )) | |
129 | { | |
130 | /* if not yet allocated, do it now */ | |
131 | if (!the_access->store_loc) | |
132 | if( !(the_access->store_loc = (char*)malloc( the_access->reclength ) ) ) | |
133 | CHILLEXCEPTION( file, line, SPACEFAIL, STORE_LOC_ALLOC ); | |
134 | actaddr = the_access->store_loc; | |
135 | } | |
136 | actlen = the_access->reclength; | |
137 | ||
138 | if( (info = setjmp( __rw_exception )) ) | |
139 | CHILLEXCEPTION( file, line, info>>16, info & 0xffff ); | |
140 | ||
141 | if( TEST_FLAG( the_access, IO_TEXTIO ) ) | |
142 | { | |
143 | readlen = actlen - 2; | |
144 | if( TEST_FLAG( the_access, IO_INDEXED ) ) | |
145 | { | |
146 | if( ! doRead( the_access, &reclen, sizeof(reclen) ) ) | |
147 | return NULL; | |
148 | if( reclen > readlen ) | |
149 | CHILLEXCEPTION( file, line, RANGEFAIL, RECORD_TOO_LONG ); | |
150 | if( ! doRead( the_access, actaddr + 2, reclen ) ) | |
151 | CHILLEXCEPTION( file, line, READFAIL, RECORD_TOO_SHORT ); | |
152 | } | |
153 | else | |
154 | { | |
155 | Association_Mode *assoc = the_access->association; | |
156 | int handle = assoc->handle; | |
157 | readbuf_t* rbuf = assoc->bufptr; | |
158 | char* cptr = actaddr+2; | |
159 | int curr; | |
160 | ||
161 | reclen = 0; | |
162 | while( readlen-- ) | |
163 | { | |
164 | curr = bgetc( handle, rbuf ); | |
165 | if( curr == '\n' ) | |
166 | goto end_of_line; | |
167 | if( curr == EOF ) | |
168 | { | |
169 | if( !reclen ) | |
170 | SET_FLAG( the_access, IO_OUTOFFILE ); | |
171 | goto end_of_line; | |
172 | } | |
173 | *cptr++ = curr; | |
174 | reclen++; | |
175 | } | |
176 | if( (curr = bgetc( handle, rbuf )) != '\n' ) | |
177 | { | |
178 | bungetc( rbuf, curr ); | |
179 | CHILLEXCEPTION( file, line, RANGEFAIL, RECORD_TOO_LONG ); | |
180 | } | |
181 | end_of_line: ; | |
182 | } | |
183 | MOV2(actaddr,&reclen); | |
184 | } | |
185 | else | |
186 | { | |
187 | switch( the_access->rectype ) | |
188 | { | |
189 | case Fixed: | |
190 | if( ! doRead( the_access, actaddr, actlen ) ) | |
191 | return NULL; | |
192 | break; | |
193 | case VaryingChars: | |
194 | if( TEST_FLAG( the_access->association, IO_VARIABLE ) ) | |
195 | { | |
196 | if( ! doRead( the_access, &reclen, sizeof(reclen) ) ) | |
197 | return NULL; | |
198 | if( reclen > actlen - 2 ) | |
199 | CHILLEXCEPTION( file, line, RANGEFAIL, RECORD_TOO_LONG ); | |
200 | readlen = TEST_FLAG( the_access, IO_INDEXED ) ? actlen - 2 : reclen; | |
201 | if( ! doRead( the_access, actaddr + 2, readlen ) ) | |
202 | CHILLEXCEPTION( file, line, READFAIL, RECORD_TOO_SHORT ); | |
203 | } | |
204 | else | |
205 | { | |
206 | if( ! doRead( the_access, actaddr + 2, reclen = actlen - 2 ) ) | |
207 | CHILLEXCEPTION( file, line, READFAIL, RECORD_TOO_SHORT ); | |
208 | } | |
209 | MOV2(actaddr,&reclen); | |
210 | break; | |
211 | } | |
212 | } | |
213 | ||
214 | return actaddr; | |
215 | } |