Commit | Line | Data |
---|---|---|
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 | 19 | along with GAS; see the file COPYING. If not, write to the Free |
4b4da160 NC |
20 | Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA |
21 | 02110-1301, 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 | ||
252b5132 RH |
83 | /* Push the state of our input, returning a pointer to saved info that |
84 | can be restored with input_file_pop (). */ | |
f740e790 | 85 | |
252b5132 | 86 | char * |
b1f1fa96 | 87 | input_file_push (void) |
252b5132 RH |
88 | { |
89 | register struct saved_file *saved; | |
90 | ||
91 | saved = (struct saved_file *) xmalloc (sizeof *saved); | |
92 | ||
93 | saved->f_in = f_in; | |
94 | saved->file_name = file_name; | |
95 | saved->preprocess = preprocess; | |
96 | if (preprocess) | |
97 | saved->app_save = app_push (); | |
98 | ||
f740e790 NC |
99 | /* Initialize for new file. */ |
100 | input_file_begin (); | |
252b5132 RH |
101 | |
102 | return (char *) saved; | |
103 | } | |
104 | ||
105 | void | |
b1f1fa96 | 106 | input_file_pop (char *arg) |
252b5132 RH |
107 | { |
108 | register struct saved_file *saved = (struct saved_file *) arg; | |
109 | ||
f740e790 | 110 | input_file_end (); /* Close out old file. */ |
252b5132 RH |
111 | |
112 | f_in = saved->f_in; | |
113 | file_name = saved->file_name; | |
114 | preprocess = saved->preprocess; | |
115 | if (preprocess) | |
116 | app_pop (saved->app_save); | |
117 | ||
118 | free (arg); | |
119 | } | |
120 | \f | |
121 | void | |
b1f1fa96 KH |
122 | input_file_open (char *filename, /* "" means use stdin. Must not be 0. */ |
123 | int pre) | |
252b5132 RH |
124 | { |
125 | int c; | |
126 | char buf[80]; | |
127 | ||
128 | preprocess = pre; | |
129 | ||
c488923f | 130 | assert (filename != 0); /* Filename may not be NULL. */ |
252b5132 | 131 | if (filename[0]) |
f24ddbdd | 132 | { |
f740e790 | 133 | f_in = fopen (filename, FOPEN_RT); |
252b5132 RH |
134 | file_name = filename; |
135 | } | |
136 | else | |
f24ddbdd NC |
137 | { |
138 | /* Use stdin for the input file. */ | |
252b5132 | 139 | f_in = stdin; |
f24ddbdd NC |
140 | /* For error messages. */ |
141 | file_name = _("{standard input}"); | |
252b5132 | 142 | } |
f24ddbdd | 143 | |
ac4528d2 AM |
144 | if (f_in == NULL) |
145 | { | |
ac4528d2 | 146 | bfd_set_error (bfd_error_system_call); |
ac4528d2 AM |
147 | as_perror (_("Can't open %s for reading"), file_name); |
148 | return; | |
149 | } | |
19e7825f | 150 | |
ac4528d2 AM |
151 | c = getc (f_in); |
152 | ||
153 | if (ferror (f_in)) | |
252b5132 | 154 | { |
5a1964ec | 155 | bfd_set_error (bfd_error_system_call); |
5a1964ec | 156 | as_perror (_("Can't open %s for reading"), file_name); |
19e7825f | 157 | |
ac4528d2 AM |
158 | fclose (f_in); |
159 | f_in = NULL; | |
252b5132 RH |
160 | return; |
161 | } | |
162 | ||
252b5132 | 163 | if (c == '#') |
f740e790 NC |
164 | { |
165 | /* Begins with comment, may not want to preprocess. */ | |
252b5132 RH |
166 | c = getc (f_in); |
167 | if (c == 'N') | |
411863a4 KH |
168 | { |
169 | fgets (buf, 80, f_in); | |
170 | if (!strncmp (buf, "O_APP", 5) && ISSPACE (buf[5])) | |
171 | preprocess = 0; | |
172 | if (!strchr (buf, '\n')) | |
173 | ungetc ('#', f_in); /* It was longer. */ | |
174 | else | |
175 | ungetc ('\n', f_in); | |
176 | } | |
1fd716b9 | 177 | else if (c == 'A') |
411863a4 KH |
178 | { |
179 | fgets (buf, 80, f_in); | |
180 | if (!strncmp (buf, "PP", 2) && ISSPACE (buf[2])) | |
181 | preprocess = 1; | |
182 | if (!strchr (buf, '\n')) | |
183 | ungetc ('#', f_in); | |
184 | else | |
185 | ungetc ('\n', f_in); | |
186 | } | |
252b5132 | 187 | else if (c == '\n') |
411863a4 | 188 | ungetc ('\n', f_in); |
252b5132 | 189 | else |
411863a4 | 190 | ungetc ('#', f_in); |
252b5132 RH |
191 | } |
192 | else | |
193 | ungetc (c, f_in); | |
194 | } | |
195 | ||
196 | /* Close input file. */ | |
f740e790 | 197 | |
c488923f | 198 | void |
b1f1fa96 | 199 | input_file_close (void) |
252b5132 | 200 | { |
f740e790 | 201 | /* Don't close a null file pointer. */ |
252b5132 | 202 | if (f_in != NULL) |
f740e790 NC |
203 | fclose (f_in); |
204 | ||
252b5132 | 205 | f_in = 0; |
7152f1dc | 206 | } |
252b5132 RH |
207 | |
208 | /* This function is passed to do_scrub_chars. */ | |
209 | ||
210 | static int | |
b1f1fa96 | 211 | input_file_get (char *buf, int buflen) |
252b5132 | 212 | { |
252b5132 RH |
213 | int size; |
214 | ||
2b47531b | 215 | size = fread (buf, sizeof (char), buflen, f_in); |
252b5132 RH |
216 | if (size < 0) |
217 | { | |
5a1964ec | 218 | bfd_set_error (bfd_error_system_call); |
252b5132 RH |
219 | as_perror (_("Can't read from %s"), file_name); |
220 | size = 0; | |
221 | } | |
252b5132 RH |
222 | return size; |
223 | } | |
224 | ||
225 | /* Read a buffer from the input file. */ | |
226 | ||
227 | char * | |
b1f1fa96 | 228 | input_file_give_next_buffer (char *where /* Where to place 1st character of new buffer. */) |
252b5132 | 229 | { |
c488923f | 230 | char *return_value; /* -> Last char of what we read, + 1. */ |
252b5132 RH |
231 | register int size; |
232 | ||
233 | if (f_in == (FILE *) 0) | |
234 | return 0; | |
f740e790 NC |
235 | /* fflush (stdin); could be done here if you want to synchronise |
236 | stdin and stdout, for the case where our input file is stdin. | |
237 | Since the assembler shouldn't do any output to stdout, we | |
238 | don't bother to synch output and input. */ | |
252b5132 RH |
239 | if (preprocess) |
240 | size = do_scrub_chars (input_file_get, where, BUFFER_SIZE); | |
241 | else | |
242 | size = fread (where, sizeof (char), BUFFER_SIZE, f_in); | |
243 | if (size < 0) | |
244 | { | |
5a1964ec | 245 | bfd_set_error (bfd_error_system_call); |
252b5132 RH |
246 | as_perror (_("Can't read from %s"), file_name); |
247 | size = 0; | |
248 | } | |
249 | if (size) | |
250 | return_value = where + size; | |
251 | else | |
252 | { | |
253 | if (fclose (f_in)) | |
5a1964ec | 254 | { |
5a1964ec | 255 | bfd_set_error (bfd_error_system_call); |
5a1964ec NC |
256 | as_perror (_("Can't close %s"), file_name); |
257 | } | |
252b5132 RH |
258 | f_in = (FILE *) 0; |
259 | return_value = 0; | |
260 | } | |
f740e790 NC |
261 | |
262 | return return_value; | |
252b5132 | 263 | } |