Commit | Line | Data |
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252b5132 | 1 | /* input_file.c - Deal with Input Files - |
ac4528d2 | 2 | Copyright 1987, 1990, 1991, 1992, 1993, 1994, 1995, 1999, 2000, 2001, |
2da5c037 | 3 | 2002, 2003, 2005 |
2b47531b | 4 | Free Software Foundation, Inc. |
252b5132 RH |
5 | |
6 | This file is part of GAS, the GNU Assembler. | |
7 | ||
8 | GAS is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2, or (at your option) | |
11 | any later version. | |
12 | ||
13 | GAS is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
2b47531b ILT |
19 | along with GAS; see the file COPYING. If not, write to the Free |
20 | Software Foundation, 59 Temple Place - Suite 330, Boston, MA | |
21 | 02111-1307, USA. */ | |
252b5132 | 22 | |
f740e790 NC |
23 | /* Confines all details of reading source bytes to this module. |
24 | All O/S specific crocks should live here. | |
25 | What we lose in "efficiency" we gain in modularity. | |
26 | Note we don't need to #include the "as.h" file. No common coupling! */ | |
252b5132 RH |
27 | |
28 | #include <stdio.h> | |
29 | #include <string.h> | |
19e7825f | 30 | #include <errno.h> |
252b5132 RH |
31 | #include "as.h" |
32 | #include "input-file.h" | |
685bd869 | 33 | #include "safe-ctype.h" |
252b5132 | 34 | |
b1f1fa96 | 35 | static int input_file_get (char *, int); |
252b5132 RH |
36 | |
37 | /* This variable is non-zero if the file currently being read should be | |
f740e790 | 38 | preprocessed by app. It is zero if the file can be read straight in. */ |
252b5132 RH |
39 | int preprocess = 0; |
40 | ||
f740e790 NC |
41 | /* This code opens a file, then delivers BUFFER_SIZE character |
42 | chunks of the file on demand. | |
43 | BUFFER_SIZE is supposed to be a number chosen for speed. | |
44 | The caller only asks once what BUFFER_SIZE is, and asks before | |
45 | the nature of the input files (if any) is known. */ | |
252b5132 RH |
46 | |
47 | #define BUFFER_SIZE (32 * 1024) | |
48 | ||
f740e790 | 49 | /* We use static data: the data area is not sharable. */ |
252b5132 RH |
50 | |
51 | static FILE *f_in; | |
52 | static char *file_name; | |
53 | ||
54 | /* Struct for saving the state of this module for file includes. */ | |
f740e790 NC |
55 | struct saved_file |
56 | { | |
57 | FILE * f_in; | |
58 | char * file_name; | |
59 | int preprocess; | |
60 | char * app_save; | |
61 | }; | |
252b5132 | 62 | \f |
47eebc20 | 63 | /* These hooks accommodate most operating systems. */ |
252b5132 | 64 | |
c488923f | 65 | void |
b1f1fa96 | 66 | input_file_begin (void) |
252b5132 RH |
67 | { |
68 | f_in = (FILE *) 0; | |
69 | } | |
70 | ||
c488923f | 71 | void |
b1f1fa96 | 72 | input_file_end (void) |
252b5132 RH |
73 | { |
74 | } | |
75 | ||
c488923f KH |
76 | /* Return BUFFER_SIZE. */ |
77 | unsigned int | |
b1f1fa96 | 78 | input_file_buffer_size (void) |
252b5132 RH |
79 | { |
80 | return (BUFFER_SIZE); | |
81 | } | |
82 | ||
c488923f | 83 | int |
b1f1fa96 | 84 | input_file_is_open (void) |
252b5132 RH |
85 | { |
86 | return f_in != (FILE *) 0; | |
87 | } | |
88 | ||
89 | /* Push the state of our input, returning a pointer to saved info that | |
90 | can be restored with input_file_pop (). */ | |
f740e790 | 91 | |
252b5132 | 92 | char * |
b1f1fa96 | 93 | input_file_push (void) |
252b5132 RH |
94 | { |
95 | register struct saved_file *saved; | |
96 | ||
97 | saved = (struct saved_file *) xmalloc (sizeof *saved); | |
98 | ||
99 | saved->f_in = f_in; | |
100 | saved->file_name = file_name; | |
101 | saved->preprocess = preprocess; | |
102 | if (preprocess) | |
103 | saved->app_save = app_push (); | |
104 | ||
f740e790 NC |
105 | /* Initialize for new file. */ |
106 | input_file_begin (); | |
252b5132 RH |
107 | |
108 | return (char *) saved; | |
109 | } | |
110 | ||
111 | void | |
b1f1fa96 | 112 | input_file_pop (char *arg) |
252b5132 RH |
113 | { |
114 | register struct saved_file *saved = (struct saved_file *) arg; | |
115 | ||
f740e790 | 116 | input_file_end (); /* Close out old file. */ |
252b5132 RH |
117 | |
118 | f_in = saved->f_in; | |
119 | file_name = saved->file_name; | |
120 | preprocess = saved->preprocess; | |
121 | if (preprocess) | |
122 | app_pop (saved->app_save); | |
123 | ||
124 | free (arg); | |
125 | } | |
126 | \f | |
127 | void | |
b1f1fa96 KH |
128 | input_file_open (char *filename, /* "" means use stdin. Must not be 0. */ |
129 | int pre) | |
252b5132 RH |
130 | { |
131 | int c; | |
132 | char buf[80]; | |
133 | ||
134 | preprocess = pre; | |
135 | ||
c488923f | 136 | assert (filename != 0); /* Filename may not be NULL. */ |
252b5132 | 137 | if (filename[0]) |
f24ddbdd | 138 | { |
f740e790 | 139 | f_in = fopen (filename, FOPEN_RT); |
252b5132 RH |
140 | file_name = filename; |
141 | } | |
142 | else | |
f24ddbdd NC |
143 | { |
144 | /* Use stdin for the input file. */ | |
252b5132 | 145 | f_in = stdin; |
f24ddbdd NC |
146 | /* For error messages. */ |
147 | file_name = _("{standard input}"); | |
252b5132 | 148 | } |
f24ddbdd | 149 | |
ac4528d2 AM |
150 | if (f_in == NULL) |
151 | { | |
152 | #ifdef BFD_ASSEMBLER | |
153 | bfd_set_error (bfd_error_system_call); | |
154 | #endif | |
155 | as_perror (_("Can't open %s for reading"), file_name); | |
156 | return; | |
157 | } | |
19e7825f | 158 | |
ac4528d2 AM |
159 | c = getc (f_in); |
160 | ||
161 | if (ferror (f_in)) | |
252b5132 | 162 | { |
5a1964ec NC |
163 | #ifdef BFD_ASSEMBLER |
164 | bfd_set_error (bfd_error_system_call); | |
165 | #endif | |
166 | as_perror (_("Can't open %s for reading"), file_name); | |
19e7825f | 167 | |
ac4528d2 AM |
168 | fclose (f_in); |
169 | f_in = NULL; | |
252b5132 RH |
170 | return; |
171 | } | |
172 | ||
252b5132 | 173 | if (c == '#') |
f740e790 NC |
174 | { |
175 | /* Begins with comment, may not want to preprocess. */ | |
252b5132 RH |
176 | c = getc (f_in); |
177 | if (c == 'N') | |
411863a4 KH |
178 | { |
179 | fgets (buf, 80, f_in); | |
180 | if (!strncmp (buf, "O_APP", 5) && ISSPACE (buf[5])) | |
181 | preprocess = 0; | |
182 | if (!strchr (buf, '\n')) | |
183 | ungetc ('#', f_in); /* It was longer. */ | |
184 | else | |
185 | ungetc ('\n', f_in); | |
186 | } | |
1fd716b9 | 187 | else if (c == 'A') |
411863a4 KH |
188 | { |
189 | fgets (buf, 80, f_in); | |
190 | if (!strncmp (buf, "PP", 2) && ISSPACE (buf[2])) | |
191 | preprocess = 1; | |
192 | if (!strchr (buf, '\n')) | |
193 | ungetc ('#', f_in); | |
194 | else | |
195 | ungetc ('\n', f_in); | |
196 | } | |
252b5132 | 197 | else if (c == '\n') |
411863a4 | 198 | ungetc ('\n', f_in); |
252b5132 | 199 | else |
411863a4 | 200 | ungetc ('#', f_in); |
252b5132 RH |
201 | } |
202 | else | |
203 | ungetc (c, f_in); | |
204 | } | |
205 | ||
206 | /* Close input file. */ | |
f740e790 | 207 | |
c488923f | 208 | void |
b1f1fa96 | 209 | input_file_close (void) |
252b5132 | 210 | { |
f740e790 | 211 | /* Don't close a null file pointer. */ |
252b5132 | 212 | if (f_in != NULL) |
f740e790 NC |
213 | fclose (f_in); |
214 | ||
252b5132 | 215 | f_in = 0; |
7152f1dc | 216 | } |
252b5132 RH |
217 | |
218 | /* This function is passed to do_scrub_chars. */ | |
219 | ||
220 | static int | |
b1f1fa96 | 221 | input_file_get (char *buf, int buflen) |
252b5132 | 222 | { |
252b5132 RH |
223 | int size; |
224 | ||
2b47531b | 225 | size = fread (buf, sizeof (char), buflen, f_in); |
252b5132 RH |
226 | if (size < 0) |
227 | { | |
5a1964ec NC |
228 | #ifdef BFD_ASSEMBLER |
229 | bfd_set_error (bfd_error_system_call); | |
230 | #endif | |
252b5132 RH |
231 | as_perror (_("Can't read from %s"), file_name); |
232 | size = 0; | |
233 | } | |
252b5132 RH |
234 | return size; |
235 | } | |
236 | ||
237 | /* Read a buffer from the input file. */ | |
238 | ||
239 | char * | |
b1f1fa96 | 240 | input_file_give_next_buffer (char *where /* Where to place 1st character of new buffer. */) |
252b5132 | 241 | { |
c488923f | 242 | char *return_value; /* -> Last char of what we read, + 1. */ |
252b5132 RH |
243 | register int size; |
244 | ||
245 | if (f_in == (FILE *) 0) | |
246 | return 0; | |
f740e790 NC |
247 | /* fflush (stdin); could be done here if you want to synchronise |
248 | stdin and stdout, for the case where our input file is stdin. | |
249 | Since the assembler shouldn't do any output to stdout, we | |
250 | don't bother to synch output and input. */ | |
252b5132 RH |
251 | if (preprocess) |
252 | size = do_scrub_chars (input_file_get, where, BUFFER_SIZE); | |
253 | else | |
254 | size = fread (where, sizeof (char), BUFFER_SIZE, f_in); | |
255 | if (size < 0) | |
256 | { | |
5a1964ec NC |
257 | #ifdef BFD_ASSEMBLER |
258 | bfd_set_error (bfd_error_system_call); | |
259 | #endif | |
252b5132 RH |
260 | as_perror (_("Can't read from %s"), file_name); |
261 | size = 0; | |
262 | } | |
263 | if (size) | |
264 | return_value = where + size; | |
265 | else | |
266 | { | |
267 | if (fclose (f_in)) | |
5a1964ec NC |
268 | { |
269 | #ifdef BFD_ASSEMBLER | |
270 | bfd_set_error (bfd_error_system_call); | |
271 | #endif | |
272 | as_perror (_("Can't close %s"), file_name); | |
273 | } | |
252b5132 RH |
274 | f_in = (FILE *) 0; |
275 | return_value = 0; | |
276 | } | |
f740e790 NC |
277 | |
278 | return return_value; | |
252b5132 | 279 | } |