Commit | Line | Data |
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252b5132 | 1 | /* input_file.c - Deal with Input Files - |
f24ddbdd | 2 | Copyright 1987, 1990, 1991, 1992, 1993, 1994, 1995, 1999, 2000, 2001, 2003 |
2b47531b | 3 | Free Software Foundation, Inc. |
252b5132 RH |
4 | |
5 | This file is part of GAS, the GNU Assembler. | |
6 | ||
7 | GAS 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 | GAS 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 | |
2b47531b ILT |
18 | along with GAS; see the file COPYING. If not, write to the Free |
19 | Software Foundation, 59 Temple Place - Suite 330, Boston, MA | |
20 | 02111-1307, USA. */ | |
252b5132 | 21 | |
f740e790 NC |
22 | /* Confines all details of reading source bytes to this module. |
23 | All O/S specific crocks should live here. | |
24 | What we lose in "efficiency" we gain in modularity. | |
25 | Note we don't need to #include the "as.h" file. No common coupling! */ | |
252b5132 RH |
26 | |
27 | #include <stdio.h> | |
28 | #include <string.h> | |
19e7825f | 29 | #include <errno.h> |
252b5132 RH |
30 | #include "as.h" |
31 | #include "input-file.h" | |
685bd869 | 32 | #include "safe-ctype.h" |
252b5132 | 33 | |
b1f1fa96 | 34 | static int input_file_get (char *, int); |
252b5132 RH |
35 | |
36 | /* This variable is non-zero if the file currently being read should be | |
f740e790 | 37 | preprocessed by app. It is zero if the file can be read straight in. */ |
252b5132 RH |
38 | int preprocess = 0; |
39 | ||
f740e790 NC |
40 | /* This code opens a file, then delivers BUFFER_SIZE character |
41 | chunks of the file on demand. | |
42 | BUFFER_SIZE is supposed to be a number chosen for speed. | |
43 | The caller only asks once what BUFFER_SIZE is, and asks before | |
44 | the nature of the input files (if any) is known. */ | |
252b5132 RH |
45 | |
46 | #define BUFFER_SIZE (32 * 1024) | |
47 | ||
f740e790 | 48 | /* We use static data: the data area is not sharable. */ |
252b5132 RH |
49 | |
50 | static FILE *f_in; | |
51 | static char *file_name; | |
52 | ||
53 | /* Struct for saving the state of this module for file includes. */ | |
f740e790 NC |
54 | struct saved_file |
55 | { | |
56 | FILE * f_in; | |
57 | char * file_name; | |
58 | int preprocess; | |
59 | char * app_save; | |
60 | }; | |
252b5132 | 61 | \f |
47eebc20 | 62 | /* These hooks accommodate most operating systems. */ |
252b5132 | 63 | |
c488923f | 64 | void |
b1f1fa96 | 65 | input_file_begin (void) |
252b5132 RH |
66 | { |
67 | f_in = (FILE *) 0; | |
68 | } | |
69 | ||
c488923f | 70 | void |
b1f1fa96 | 71 | input_file_end (void) |
252b5132 RH |
72 | { |
73 | } | |
74 | ||
c488923f KH |
75 | /* Return BUFFER_SIZE. */ |
76 | unsigned int | |
b1f1fa96 | 77 | input_file_buffer_size (void) |
252b5132 RH |
78 | { |
79 | return (BUFFER_SIZE); | |
80 | } | |
81 | ||
c488923f | 82 | int |
b1f1fa96 | 83 | input_file_is_open (void) |
252b5132 RH |
84 | { |
85 | return f_in != (FILE *) 0; | |
86 | } | |
87 | ||
88 | /* Push the state of our input, returning a pointer to saved info that | |
89 | can be restored with input_file_pop (). */ | |
f740e790 | 90 | |
252b5132 | 91 | char * |
b1f1fa96 | 92 | input_file_push (void) |
252b5132 RH |
93 | { |
94 | register struct saved_file *saved; | |
95 | ||
96 | saved = (struct saved_file *) xmalloc (sizeof *saved); | |
97 | ||
98 | saved->f_in = f_in; | |
99 | saved->file_name = file_name; | |
100 | saved->preprocess = preprocess; | |
101 | if (preprocess) | |
102 | saved->app_save = app_push (); | |
103 | ||
f740e790 NC |
104 | /* Initialize for new file. */ |
105 | input_file_begin (); | |
252b5132 RH |
106 | |
107 | return (char *) saved; | |
108 | } | |
109 | ||
110 | void | |
b1f1fa96 | 111 | input_file_pop (char *arg) |
252b5132 RH |
112 | { |
113 | register struct saved_file *saved = (struct saved_file *) arg; | |
114 | ||
f740e790 | 115 | input_file_end (); /* Close out old file. */ |
252b5132 RH |
116 | |
117 | f_in = saved->f_in; | |
118 | file_name = saved->file_name; | |
119 | preprocess = saved->preprocess; | |
120 | if (preprocess) | |
121 | app_pop (saved->app_save); | |
122 | ||
123 | free (arg); | |
124 | } | |
125 | \f | |
126 | void | |
b1f1fa96 KH |
127 | input_file_open (char *filename, /* "" means use stdin. Must not be 0. */ |
128 | int pre) | |
252b5132 RH |
129 | { |
130 | int c; | |
131 | char buf[80]; | |
132 | ||
133 | preprocess = pre; | |
134 | ||
c488923f | 135 | assert (filename != 0); /* Filename may not be NULL. */ |
252b5132 | 136 | if (filename[0]) |
f24ddbdd | 137 | { |
f740e790 | 138 | f_in = fopen (filename, FOPEN_RT); |
252b5132 RH |
139 | file_name = filename; |
140 | } | |
141 | else | |
f24ddbdd NC |
142 | { |
143 | /* Use stdin for the input file. */ | |
252b5132 | 144 | f_in = stdin; |
f24ddbdd NC |
145 | /* For error messages. */ |
146 | file_name = _("{standard input}"); | |
252b5132 | 147 | } |
f24ddbdd | 148 | |
19e7825f NC |
149 | if (f_in) |
150 | c = getc (f_in); | |
151 | ||
152 | if (f_in == NULL || ferror (f_in)) | |
252b5132 | 153 | { |
19e7825f NC |
154 | switch (errno) |
155 | { | |
156 | case ENOENT: | |
157 | as_bad (_("%s: no such file"), filename); | |
158 | break; | |
159 | case EISDIR: | |
160 | as_bad (_("%s: is a directory"), filename); | |
161 | break; | |
162 | default: | |
163 | as_bad (_("can't open %s for reading"), file_name); | |
164 | as_perror ("%s", file_name); | |
165 | } | |
166 | ||
167 | if (f_in) | |
168 | { | |
169 | fclose (f_in); | |
170 | f_in = NULL; | |
171 | } | |
252b5132 RH |
172 | return; |
173 | } | |
174 | ||
252b5132 | 175 | if (c == '#') |
f740e790 NC |
176 | { |
177 | /* Begins with comment, may not want to preprocess. */ | |
252b5132 RH |
178 | c = getc (f_in); |
179 | if (c == 'N') | |
411863a4 KH |
180 | { |
181 | fgets (buf, 80, f_in); | |
182 | if (!strncmp (buf, "O_APP", 5) && ISSPACE (buf[5])) | |
183 | preprocess = 0; | |
184 | if (!strchr (buf, '\n')) | |
185 | ungetc ('#', f_in); /* It was longer. */ | |
186 | else | |
187 | ungetc ('\n', f_in); | |
188 | } | |
1fd716b9 | 189 | else if (c == 'A') |
411863a4 KH |
190 | { |
191 | fgets (buf, 80, f_in); | |
192 | if (!strncmp (buf, "PP", 2) && ISSPACE (buf[2])) | |
193 | preprocess = 1; | |
194 | if (!strchr (buf, '\n')) | |
195 | ungetc ('#', f_in); | |
196 | else | |
197 | ungetc ('\n', f_in); | |
198 | } | |
252b5132 | 199 | else if (c == '\n') |
411863a4 | 200 | ungetc ('\n', f_in); |
252b5132 | 201 | else |
411863a4 | 202 | ungetc ('#', f_in); |
252b5132 RH |
203 | } |
204 | else | |
205 | ungetc (c, f_in); | |
206 | } | |
207 | ||
208 | /* Close input file. */ | |
f740e790 | 209 | |
c488923f | 210 | void |
b1f1fa96 | 211 | input_file_close (void) |
252b5132 | 212 | { |
f740e790 | 213 | /* Don't close a null file pointer. */ |
252b5132 | 214 | if (f_in != NULL) |
f740e790 NC |
215 | fclose (f_in); |
216 | ||
252b5132 | 217 | f_in = 0; |
7152f1dc | 218 | } |
252b5132 RH |
219 | |
220 | /* This function is passed to do_scrub_chars. */ | |
221 | ||
222 | static int | |
b1f1fa96 | 223 | input_file_get (char *buf, int buflen) |
252b5132 | 224 | { |
252b5132 RH |
225 | int size; |
226 | ||
2b47531b | 227 | size = fread (buf, sizeof (char), buflen, f_in); |
252b5132 RH |
228 | if (size < 0) |
229 | { | |
230 | as_perror (_("Can't read from %s"), file_name); | |
231 | size = 0; | |
232 | } | |
252b5132 RH |
233 | return size; |
234 | } | |
235 | ||
236 | /* Read a buffer from the input file. */ | |
237 | ||
238 | char * | |
b1f1fa96 | 239 | input_file_give_next_buffer (char *where /* Where to place 1st character of new buffer. */) |
252b5132 | 240 | { |
c488923f | 241 | char *return_value; /* -> Last char of what we read, + 1. */ |
252b5132 RH |
242 | register int size; |
243 | ||
244 | if (f_in == (FILE *) 0) | |
245 | return 0; | |
f740e790 NC |
246 | /* fflush (stdin); could be done here if you want to synchronise |
247 | stdin and stdout, for the case where our input file is stdin. | |
248 | Since the assembler shouldn't do any output to stdout, we | |
249 | don't bother to synch output and input. */ | |
252b5132 RH |
250 | if (preprocess) |
251 | size = do_scrub_chars (input_file_get, where, BUFFER_SIZE); | |
252 | else | |
253 | size = fread (where, sizeof (char), BUFFER_SIZE, f_in); | |
254 | if (size < 0) | |
255 | { | |
256 | as_perror (_("Can't read from %s"), file_name); | |
257 | size = 0; | |
258 | } | |
259 | if (size) | |
260 | return_value = where + size; | |
261 | else | |
262 | { | |
263 | if (fclose (f_in)) | |
264 | as_perror (_("Can't close %s"), file_name); | |
265 | f_in = (FILE *) 0; | |
266 | return_value = 0; | |
267 | } | |
f740e790 NC |
268 | |
269 | return return_value; | |
252b5132 | 270 | } |