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252b5132 | 1 | /* input_file.c - Deal with Input Files - |
f740e790 | 2 | Copyright 1987, 1990, 1991, 1992, 1993, 1994, 1995, 1999, 2000, 2001 |
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> | |
252b5132 RH |
29 | #include "as.h" |
30 | #include "input-file.h" | |
685bd869 | 31 | #include "safe-ctype.h" |
252b5132 | 32 | |
2b47531b | 33 | static int input_file_get PARAMS ((char *, int)); |
252b5132 RH |
34 | |
35 | /* This variable is non-zero if the file currently being read should be | |
f740e790 | 36 | preprocessed by app. It is zero if the file can be read straight in. */ |
252b5132 RH |
37 | int preprocess = 0; |
38 | ||
f740e790 NC |
39 | /* This code opens a file, then delivers BUFFER_SIZE character |
40 | chunks of the file on demand. | |
41 | BUFFER_SIZE is supposed to be a number chosen for speed. | |
42 | The caller only asks once what BUFFER_SIZE is, and asks before | |
43 | the nature of the input files (if any) is known. */ | |
252b5132 RH |
44 | |
45 | #define BUFFER_SIZE (32 * 1024) | |
46 | ||
f740e790 | 47 | /* We use static data: the data area is not sharable. */ |
252b5132 RH |
48 | |
49 | static FILE *f_in; | |
50 | static char *file_name; | |
51 | ||
52 | /* Struct for saving the state of this module for file includes. */ | |
f740e790 NC |
53 | struct saved_file |
54 | { | |
55 | FILE * f_in; | |
56 | char * file_name; | |
57 | int preprocess; | |
58 | char * app_save; | |
59 | }; | |
252b5132 | 60 | \f |
c488923f | 61 | /* These hooks accomodate most operating systems. */ |
252b5132 | 62 | |
c488923f | 63 | void |
252b5132 RH |
64 | input_file_begin () |
65 | { | |
66 | f_in = (FILE *) 0; | |
67 | } | |
68 | ||
c488923f | 69 | void |
252b5132 RH |
70 | input_file_end () |
71 | { | |
72 | } | |
73 | ||
c488923f KH |
74 | /* Return BUFFER_SIZE. */ |
75 | unsigned int | |
252b5132 RH |
76 | input_file_buffer_size () |
77 | { | |
78 | return (BUFFER_SIZE); | |
79 | } | |
80 | ||
c488923f | 81 | int |
252b5132 RH |
82 | input_file_is_open () |
83 | { | |
84 | return f_in != (FILE *) 0; | |
85 | } | |
86 | ||
87 | /* Push the state of our input, returning a pointer to saved info that | |
88 | can be restored with input_file_pop (). */ | |
f740e790 | 89 | |
252b5132 RH |
90 | char * |
91 | input_file_push () | |
92 | { | |
93 | register struct saved_file *saved; | |
94 | ||
95 | saved = (struct saved_file *) xmalloc (sizeof *saved); | |
96 | ||
97 | saved->f_in = f_in; | |
98 | saved->file_name = file_name; | |
99 | saved->preprocess = preprocess; | |
100 | if (preprocess) | |
101 | saved->app_save = app_push (); | |
102 | ||
f740e790 NC |
103 | /* Initialize for new file. */ |
104 | input_file_begin (); | |
252b5132 RH |
105 | |
106 | return (char *) saved; | |
107 | } | |
108 | ||
109 | void | |
110 | input_file_pop (arg) | |
111 | char *arg; | |
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 | |
127 | input_file_open (filename, pre) | |
c488923f | 128 | char *filename; /* "" means use stdin. Must not be 0. */ |
252b5132 RH |
129 | int pre; |
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]) |
c488923f | 138 | { /* We have a file name. Suck it and see. */ |
f740e790 | 139 | f_in = fopen (filename, FOPEN_RT); |
252b5132 RH |
140 | file_name = filename; |
141 | } | |
142 | else | |
c488923f | 143 | { /* use stdin for the input file. */ |
252b5132 | 144 | f_in = stdin; |
c488923f | 145 | file_name = _("{standard input}"); /* For error messages. */ |
252b5132 RH |
146 | } |
147 | if (f_in == (FILE *) 0) | |
148 | { | |
0e389e77 | 149 | as_bad (_("can't open %s for reading"), file_name); |
252b5132 RH |
150 | as_perror ("%s", file_name); |
151 | return; | |
152 | } | |
153 | ||
154 | c = getc (f_in); | |
155 | if (c == '#') | |
f740e790 NC |
156 | { |
157 | /* Begins with comment, may not want to preprocess. */ | |
252b5132 RH |
158 | c = getc (f_in); |
159 | if (c == 'N') | |
411863a4 KH |
160 | { |
161 | fgets (buf, 80, f_in); | |
162 | if (!strncmp (buf, "O_APP", 5) && ISSPACE (buf[5])) | |
163 | preprocess = 0; | |
164 | if (!strchr (buf, '\n')) | |
165 | ungetc ('#', f_in); /* It was longer. */ | |
166 | else | |
167 | ungetc ('\n', f_in); | |
168 | } | |
1fd716b9 | 169 | else if (c == 'A') |
411863a4 KH |
170 | { |
171 | fgets (buf, 80, f_in); | |
172 | if (!strncmp (buf, "PP", 2) && ISSPACE (buf[2])) | |
173 | preprocess = 1; | |
174 | if (!strchr (buf, '\n')) | |
175 | ungetc ('#', f_in); | |
176 | else | |
177 | ungetc ('\n', f_in); | |
178 | } | |
252b5132 | 179 | else if (c == '\n') |
411863a4 | 180 | ungetc ('\n', f_in); |
252b5132 | 181 | else |
411863a4 | 182 | ungetc ('#', f_in); |
252b5132 RH |
183 | } |
184 | else | |
185 | ungetc (c, f_in); | |
186 | } | |
187 | ||
188 | /* Close input file. */ | |
f740e790 | 189 | |
c488923f | 190 | void |
252b5132 RH |
191 | input_file_close () |
192 | { | |
f740e790 | 193 | /* Don't close a null file pointer. */ |
252b5132 | 194 | if (f_in != NULL) |
f740e790 NC |
195 | fclose (f_in); |
196 | ||
252b5132 | 197 | f_in = 0; |
7152f1dc | 198 | } |
252b5132 RH |
199 | |
200 | /* This function is passed to do_scrub_chars. */ | |
201 | ||
202 | static int | |
2b47531b ILT |
203 | input_file_get (buf, buflen) |
204 | char *buf; | |
205 | int buflen; | |
252b5132 | 206 | { |
252b5132 RH |
207 | int size; |
208 | ||
2b47531b | 209 | size = fread (buf, sizeof (char), buflen, f_in); |
252b5132 RH |
210 | if (size < 0) |
211 | { | |
212 | as_perror (_("Can't read from %s"), file_name); | |
213 | size = 0; | |
214 | } | |
252b5132 RH |
215 | return size; |
216 | } | |
217 | ||
218 | /* Read a buffer from the input file. */ | |
219 | ||
220 | char * | |
221 | input_file_give_next_buffer (where) | |
c488923f | 222 | char *where; /* Where to place 1st character of new buffer. */ |
252b5132 | 223 | { |
c488923f | 224 | char *return_value; /* -> Last char of what we read, + 1. */ |
252b5132 RH |
225 | register int size; |
226 | ||
227 | if (f_in == (FILE *) 0) | |
228 | return 0; | |
f740e790 NC |
229 | /* fflush (stdin); could be done here if you want to synchronise |
230 | stdin and stdout, for the case where our input file is stdin. | |
231 | Since the assembler shouldn't do any output to stdout, we | |
232 | don't bother to synch output and input. */ | |
252b5132 RH |
233 | if (preprocess) |
234 | size = do_scrub_chars (input_file_get, where, BUFFER_SIZE); | |
235 | else | |
236 | size = fread (where, sizeof (char), BUFFER_SIZE, f_in); | |
237 | if (size < 0) | |
238 | { | |
239 | as_perror (_("Can't read from %s"), file_name); | |
240 | size = 0; | |
241 | } | |
242 | if (size) | |
243 | return_value = where + size; | |
244 | else | |
245 | { | |
246 | if (fclose (f_in)) | |
247 | as_perror (_("Can't close %s"), file_name); | |
248 | f_in = (FILE *) 0; | |
249 | return_value = 0; | |
250 | } | |
f740e790 NC |
251 | |
252 | return return_value; | |
252b5132 | 253 | } |