| 1 | /* input_file.c - Deal with Input Files - |
| 2 | Copyright (C) 1987, 1990, 1991, 1992 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of GAS, the GNU Assembler. |
| 5 | |
| 6 | GAS is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 2, or (at your option) |
| 9 | any later version. |
| 10 | |
| 11 | GAS is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with GAS; see the file COPYING. If not, write to |
| 18 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| 19 | |
| 20 | /* |
| 21 | * Confines all details of reading source bytes to this module. |
| 22 | * All O/S specific crocks should live here. |
| 23 | * What we lose in "efficiency" we gain in modularity. |
| 24 | * Note we don't need to #include the "as.h" file. No common coupling! |
| 25 | */ |
| 26 | |
| 27 | #ifdef USG |
| 28 | #define setbuffer(stream, buf, size) setvbuf((stream), (buf), _IOFBF, (size)) |
| 29 | #endif |
| 30 | |
| 31 | #include <stdio.h> |
| 32 | #include <assert.h> |
| 33 | #include <string.h> |
| 34 | |
| 35 | #include "as.h" |
| 36 | #include "input-file.h" |
| 37 | |
| 38 | /* This variable is non-zero if the file currently being read should be |
| 39 | preprocessed by app. It is zero if the file can be read straight in. |
| 40 | */ |
| 41 | int preprocess = 0; |
| 42 | |
| 43 | /* |
| 44 | * This code opens a file, then delivers BUFFER_SIZE character |
| 45 | * chunks of the file on demand. |
| 46 | * BUFFER_SIZE is supposed to be a number chosen for speed. |
| 47 | * The caller only asks once what BUFFER_SIZE is, and asks before |
| 48 | * the nature of the input files (if any) is known. |
| 49 | */ |
| 50 | |
| 51 | #define BUFFER_SIZE (32 * 1024) |
| 52 | |
| 53 | /* |
| 54 | * We use static data: the data area is not sharable. |
| 55 | */ |
| 56 | |
| 57 | FILE *f_in; |
| 58 | /* static JF remove static so app.c can use file_name */ |
| 59 | char *file_name; |
| 60 | |
| 61 | /* Struct for saving the state of this module for file includes. */ |
| 62 | struct saved_file |
| 63 | { |
| 64 | FILE *f_in; |
| 65 | char *file_name; |
| 66 | int preprocess; |
| 67 | char *app_save; |
| 68 | }; |
| 69 | \f |
| 70 | /* These hooks accomodate most operating systems. */ |
| 71 | |
| 72 | void |
| 73 | input_file_begin () |
| 74 | { |
| 75 | f_in = (FILE *) 0; |
| 76 | } |
| 77 | |
| 78 | void |
| 79 | input_file_end () |
| 80 | { |
| 81 | } |
| 82 | |
| 83 | /* Return BUFFER_SIZE. */ |
| 84 | int |
| 85 | input_file_buffer_size () |
| 86 | { |
| 87 | return (BUFFER_SIZE); |
| 88 | } |
| 89 | |
| 90 | int |
| 91 | input_file_is_open () |
| 92 | { |
| 93 | return f_in != (FILE *) 0; |
| 94 | } |
| 95 | |
| 96 | /* Push the state of our input, returning a pointer to saved info that |
| 97 | can be restored with input_file_pop (). */ |
| 98 | char * |
| 99 | input_file_push () |
| 100 | { |
| 101 | register struct saved_file *saved; |
| 102 | |
| 103 | saved = (struct saved_file *) xmalloc (sizeof *saved); |
| 104 | |
| 105 | saved->f_in = f_in; |
| 106 | saved->file_name = file_name; |
| 107 | saved->preprocess = preprocess; |
| 108 | if (preprocess) |
| 109 | saved->app_save = app_push (); |
| 110 | |
| 111 | input_file_begin (); /* Initialize for new file */ |
| 112 | |
| 113 | return (char *) saved; |
| 114 | } |
| 115 | |
| 116 | void |
| 117 | input_file_pop (arg) |
| 118 | char *arg; |
| 119 | { |
| 120 | register struct saved_file *saved = (struct saved_file *) arg; |
| 121 | |
| 122 | input_file_end (); /* Close out old file */ |
| 123 | |
| 124 | f_in = saved->f_in; |
| 125 | file_name = saved->file_name; |
| 126 | preprocess = saved->preprocess; |
| 127 | if (preprocess) |
| 128 | app_pop (saved->app_save); |
| 129 | |
| 130 | free (arg); |
| 131 | } |
| 132 | \f |
| 133 | #ifdef DONTDEF /* JF save old version in case we need it */ |
| 134 | void |
| 135 | input_file_open (filename, preprocess, debugging) |
| 136 | char *filename; /* "" means use stdin. Must not be 0. */ |
| 137 | int preprocess; /* TRUE if needs app. */ |
| 138 | int debugging; /* TRUE if we are debugging assembler. */ |
| 139 | { |
| 140 | assert (filename != 0); /* Filename may not be NULL. */ |
| 141 | if (filename[0]) |
| 142 | { /* We have a file name. Suck it and see. */ |
| 143 | file_handle = open (filename, O_RDONLY, 0); |
| 144 | file_name = filename; |
| 145 | } |
| 146 | else |
| 147 | { /* use stdin for the input file. */ |
| 148 | file_handle = fileno (stdin); |
| 149 | file_name = "{standard input}"; /* For error messages. */ |
| 150 | } |
| 151 | if (file_handle < 0) |
| 152 | as_perror ("Can't open %s for reading", file_name); |
| 153 | if (preprocess) |
| 154 | { |
| 155 | /* |
| 156 | * This code was written in haste for a frobbed BSD 4.2. |
| 157 | * I have a flight to catch: will someone please do proper |
| 158 | * error checks? - Dean. |
| 159 | */ |
| 160 | int pid; |
| 161 | char temporary_file_name[12]; |
| 162 | int fd; |
| 163 | union wait status; |
| 164 | |
| 165 | (void) strcpy (temporary_file_name, "#appXXXXXX"); |
| 166 | (void) mktemp (temporary_file_name); |
| 167 | pid = vfork (); |
| 168 | if (pid == -1) |
| 169 | { |
| 170 | as_perror ("Vfork failed", file_name); |
| 171 | _exit (144); |
| 172 | } |
| 173 | if (pid == 0) |
| 174 | { |
| 175 | (void) dup2 (file_handle, fileno (stdin)); |
| 176 | fd = open (temporary_file_name, O_WRONLY + O_TRUNC + O_CREAT, 0666); |
| 177 | if (fd == -1) |
| 178 | { |
| 179 | (void) write (2, "Can't open temporary\n", 21); |
| 180 | _exit (99); |
| 181 | } |
| 182 | (void) dup2 (fd, fileno (stdout)); |
| 183 | /* JF for testing #define PREPROCESSOR "/lib/app" */ |
| 184 | #define PREPROCESSOR "./app" |
| 185 | execl (PREPROCESSOR, PREPROCESSOR, 0); |
| 186 | execl ("app", "app", 0); |
| 187 | (void) write (2, "Exec of app failed. Get help.\n", 31); |
| 188 | (void) unlink (temporary_file_name); |
| 189 | _exit (11); |
| 190 | } |
| 191 | (void) wait (&status); |
| 192 | if (status.w_status & 0xFF00) /* JF was 0xF000, was wrong */ |
| 193 | { |
| 194 | file_handle = -1; |
| 195 | as_bad ("Can't preprocess file \"%s\", status = %xx", file_name, status.w_status); |
| 196 | } |
| 197 | else |
| 198 | { |
| 199 | file_handle = open (temporary_file_name, O_RDONLY, 0); |
| 200 | if (!debugging && unlink (temporary_file_name)) |
| 201 | as_perror ("Can't delete temp file %s", temporary_file_name); |
| 202 | } |
| 203 | if (file_handle == -1) |
| 204 | as_perror ("Can't retrieve temp file %s", temporary_file_name); |
| 205 | } |
| 206 | } |
| 207 | |
| 208 | #else |
| 209 | |
| 210 | void |
| 211 | input_file_open (filename, pre) |
| 212 | char *filename; /* "" means use stdin. Must not be 0. */ |
| 213 | int pre; |
| 214 | { |
| 215 | int c; |
| 216 | char buf[80]; |
| 217 | |
| 218 | preprocess = pre; |
| 219 | |
| 220 | assert (filename != 0); /* Filename may not be NULL. */ |
| 221 | if (filename[0]) |
| 222 | { /* We have a file name. Suck it and see. */ |
| 223 | f_in = fopen (filename, "r"); |
| 224 | file_name = filename; |
| 225 | } |
| 226 | else |
| 227 | { /* use stdin for the input file. */ |
| 228 | f_in = stdin; |
| 229 | file_name = "{standard input}"; /* For error messages. */ |
| 230 | } |
| 231 | if (f_in == (FILE *) 0) |
| 232 | { |
| 233 | as_perror ("Can't open %s for reading", file_name); |
| 234 | return; |
| 235 | } |
| 236 | |
| 237 | #ifdef _IOFBF |
| 238 | /* Ask stdio to buffer our input at BUFFER_SIZE, with a dynamically |
| 239 | allocated buffer. */ |
| 240 | setvbuf (f_in, (char *) NULL, _IOFBF, BUFFER_SIZE); |
| 241 | #endif /* VMS */ |
| 242 | |
| 243 | c = getc (f_in); |
| 244 | if (c == '#') |
| 245 | { /* Begins with comment, may not want to preprocess */ |
| 246 | c = getc (f_in); |
| 247 | if (c == 'N') |
| 248 | { |
| 249 | fgets (buf, 80, f_in); |
| 250 | if (!strcmp (buf, "O_APP\n")) |
| 251 | preprocess = 0; |
| 252 | if (!strchr (buf, '\n')) |
| 253 | ungetc ('#', f_in); /* It was longer */ |
| 254 | else |
| 255 | ungetc ('\n', f_in); |
| 256 | } |
| 257 | else if (c == '\n') |
| 258 | ungetc ('\n', f_in); |
| 259 | else |
| 260 | ungetc ('#', f_in); |
| 261 | } |
| 262 | else |
| 263 | ungetc (c, f_in); |
| 264 | |
| 265 | #ifdef DONTDEF |
| 266 | if (preprocess) |
| 267 | { |
| 268 | char temporary_file_name[17]; |
| 269 | FILE *f_out; |
| 270 | |
| 271 | (void) strcpy (temporary_file_name, "/tmp/#appXXXXXX"); |
| 272 | (void) mktemp (temporary_file_name); |
| 273 | f_out = fopen (temporary_file_name, "w+"); |
| 274 | if (f_out == (FILE *) 0) |
| 275 | as_perror ("Can't open temp file %s", temporary_file_name); |
| 276 | |
| 277 | /* JF this will have to be moved on any system that |
| 278 | does not support removal of open files. */ |
| 279 | (void) unlink (temporary_file_name); /* JF do it NOW */ |
| 280 | do_scrub (f_in, f_out); |
| 281 | (void) fclose (f_in); /* All done with it */ |
| 282 | (void) rewind (f_out); |
| 283 | f_in = f_out; |
| 284 | } |
| 285 | #endif |
| 286 | } |
| 287 | |
| 288 | #endif |
| 289 | |
| 290 | /* Close input file. */ |
| 291 | void |
| 292 | input_file_close () |
| 293 | { |
| 294 | if (f_in != NULL) |
| 295 | { |
| 296 | fclose (f_in); |
| 297 | } /* don't close a null file pointer */ |
| 298 | f_in = 0; |
| 299 | } /* input_file_close() */ |
| 300 | |
| 301 | char * |
| 302 | input_file_give_next_buffer (where) |
| 303 | char *where; /* Where to place 1st character of new buffer. */ |
| 304 | { |
| 305 | char *return_value; /* -> Last char of what we read, + 1. */ |
| 306 | register int size; |
| 307 | |
| 308 | if (f_in == (FILE *) 0) |
| 309 | return 0; |
| 310 | /* |
| 311 | * fflush (stdin); could be done here if you want to synchronise |
| 312 | * stdin and stdout, for the case where our input file is stdin. |
| 313 | * Since the assembler shouldn't do any output to stdout, we |
| 314 | * don't bother to synch output and input. |
| 315 | */ |
| 316 | if (preprocess) |
| 317 | { |
| 318 | char *p; |
| 319 | int n; |
| 320 | int ch; |
| 321 | extern FILE *scrub_file; |
| 322 | |
| 323 | scrub_file = f_in; |
| 324 | for (p = where, n = BUFFER_SIZE; n; --n) |
| 325 | { |
| 326 | |
| 327 | ch = do_scrub_next_char (scrub_from_file, scrub_to_file); |
| 328 | if (ch == EOF) |
| 329 | break; |
| 330 | *p++ = ch; |
| 331 | } |
| 332 | size = BUFFER_SIZE - n; |
| 333 | } |
| 334 | else |
| 335 | size = fread (where, sizeof (char), BUFFER_SIZE, f_in); |
| 336 | if (size < 0) |
| 337 | { |
| 338 | as_perror ("Can't read from %s", file_name); |
| 339 | size = 0; |
| 340 | } |
| 341 | if (size) |
| 342 | return_value = where + size; |
| 343 | else |
| 344 | { |
| 345 | if (fclose (f_in)) |
| 346 | as_perror ("Can't close %s", file_name); |
| 347 | f_in = (FILE *) 0; |
| 348 | return_value = 0; |
| 349 | } |
| 350 | return (return_value); |
| 351 | } |
| 352 | |
| 353 | /* end of input-file.c */ |