1 /*- 2 * This code is derived from software copyrighted by the Free Software 3 * Foundation. 4 * 5 * Modified 1991 by Donn Seeley at UUNET Technologies, Inc. 6 */ 7 8 #ifndef lint 9 static char sccsid[] = "@(#)input-file.c 6.2 (Berkeley) 05/08/91"; 10 #endif /* not lint */ 11 12 /* input_file.c - Deal with Input Files - 13 Copyright (C) 1987 Free Software Foundation, Inc. 14 15 This file is part of GAS, the GNU Assembler. 16 17 GAS is free software; you can redistribute it and/or modify 18 it under the terms of the GNU General Public License as published by 19 the Free Software Foundation; either version 1, or (at your option) 20 any later version. 21 22 GAS is distributed in the hope that it will be useful, 23 but WITHOUT ANY WARRANTY; without even the implied warranty of 24 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 25 GNU General Public License for more details. 26 27 You should have received a copy of the GNU General Public License 28 along with GAS; see the file COPYING. If not, write to 29 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ 30 31 /* 32 * Confines all details of reading source bytes to this module. 33 * All O/S specific crocks should live here. 34 * What we lose in "efficiency" we gain in modularity. 35 * Note we don't need to #include the "as.h" file. No common coupling! 36 */ 37 38 #define NDEBUG /* JF remove asserts */ 39 40 #ifdef USG 41 #define index strchr 42 /* JF: What's the difference between _IOLBF and _IOFBF ? */ 43 #define setbuffer(stream, buf, size) setvbuf((stream), (buf), _IOFBF, (size)) 44 #endif 45 46 #include <stdio.h> 47 #include <assert.h> 48 /* #include <sys/types.h> 49 #include <sys/stat.h> 50 #include <sys/file.h> 51 #include <sys/wait.h> */ 52 53 /* #include "style.h" */ 54 #include "input-file.h" 55 56 /* This variable is non-zero if the file currently being read should be 57 preprocessed by app. It is zero if the file can be read straight in. 58 */ 59 int preprocess = 0; 60 61 void as_perror(); 62 63 /* 64 * This code opens a file, then delivers BUFFER_SIZE character 65 * chunks of the file on demand. 66 * BUFFER_SIZE is supposed to be a number chosen for speed. 67 * The caller only asks once what BUFFER_SIZE is, and asks before 68 * the nature of the input files (if any) is known. 69 */ 70 71 #define BUFFER_SIZE (32 * 1024) 72 73 static char in_buf[BUFFER_SIZE]; 74 75 /* 76 * We use static data: the data area is not sharable. 77 */ 78 79 FILE *f_in; /* JF do things the RIGHT way */ 80 /* static JF remove static so app.c can use file_name */ 81 char * file_name; 82 83 /* These hooks accomodate most operating systems. */ 84 85 void 86 input_file_begin () 87 { 88 /* file_handle = -1; */ 89 f_in = (FILE *)0; 90 } 91 92 void 93 input_file_end () 94 { 95 } 96 97 int /* Return BUFFER_SIZE. */ 98 input_file_buffer_size () 99 { 100 return (BUFFER_SIZE); 101 } 102 103 int 104 input_file_is_open () 105 { 106 /* return (file_handle >= 0); */ 107 return f_in!=(FILE *)0; 108 } 109 110 #ifdef DONTDEF /* JF save old version in case we need it */ 111 void 112 input_file_open (filename, preprocess, debugging) 113 char * filename; /* "" means use stdin. Must not be 0. */ 114 int preprocess; /* TRUE if needs app. */ 115 int debugging; /* TRUE if we are debugging assembler. */ 116 { 117 assert( filename != 0 ); /* Filename may not be NULL. */ 118 if (filename [0]) 119 { /* We have a file name. Suck it and see. */ 120 file_handle = open (filename, O_RDONLY, 0); 121 file_name = filename; 122 } 123 else 124 { /* use stdin for the input file. */ 125 file_handle = fileno (stdin); 126 file_name = "{standard input}"; /* For error messages. */ 127 } 128 if (file_handle < 0) 129 as_perror ("Can't open %s for reading", file_name); 130 if ( preprocess ) 131 { 132 /* 133 * This code was written in haste for a frobbed BSD 4.2. 134 * I have a flight to catch: will someone please do proper 135 * error checks? - Dean. 136 */ 137 int pid; 138 char temporary_file_name [12]; 139 int fd; 140 union wait status; 141 char *mktemp(); 142 143 (void)strcpy (temporary_file_name, "#appXXXXXX"); 144 (void)mktemp (temporary_file_name); 145 pid = vfork (); 146 if (pid == -1) 147 { 148 as_perror ("Vfork failed", file_name); 149 _exit (144); 150 } 151 if (pid == 0) 152 { 153 (void)dup2 (file_handle, fileno(stdin)); 154 fd = open (temporary_file_name, O_WRONLY + O_TRUNC + O_CREAT, 0666); 155 if (fd == -1) 156 { 157 (void)write(2,"Can't open temporary\n",21); 158 _exit (99); 159 } 160 (void)dup2 (fd, fileno(stdout)); 161 /* JF for testing #define PREPROCESSOR "/lib/app" */ 162 #define PREPROCESSOR "./app" 163 execl (PREPROCESSOR, PREPROCESSOR, 0); 164 execl ("app","app",0); 165 (void)write(2,"Exec of app failed. Get help.\n",31); 166 (void)unlink(temporary_file_name); 167 _exit (11); 168 } 169 (void)wait (& status); 170 if (status.w_status & 0xFF00) /* JF was 0xF000, was wrong */ 171 { 172 file_handle = -1; 173 as_warn( "Can't preprocess file \"%s\", status = %xx", file_name, status.w_status ); 174 } 175 else 176 { 177 file_handle = open (temporary_file_name, O_RDONLY, 0); 178 if ( ! debugging && unlink(temporary_file_name)) 179 as_perror ("Can't delete temp file %s", temporary_file_name); 180 } 181 if (file_handle == -1) 182 as_perror ("Can't retrieve temp file %s", temporary_file_name); 183 } 184 } 185 #else 186 187 void 188 input_file_open (filename,pre) 189 char * filename; /* "" means use stdin. Must not be 0. */ 190 int pre; 191 { 192 int c; 193 char buf[80]; 194 195 preprocess = pre; 196 197 assert( filename != 0 ); /* Filename may not be NULL. */ 198 if (filename [0]) { /* We have a file name. Suck it and see. */ 199 f_in=fopen(filename,"r"); 200 file_name=filename; 201 } else { /* use stdin for the input file. */ 202 f_in = stdin; 203 file_name = "{standard input}"; /* For error messages. */ 204 } 205 if (f_in==(FILE *)0) { 206 as_perror ("Can't open %s for reading", file_name); 207 return; 208 } 209 #ifndef VMS 210 setbuffer(f_in,in_buf,BUFFER_SIZE); 211 #endif /* VMS */ 212 c=getc(f_in); 213 if(c=='#') { /* Begins with comment, may not want to preprocess */ 214 c=getc(f_in); 215 if(c=='N') { 216 fgets(buf,80,f_in); 217 if(!strcmp(buf,"O_APP\n")) 218 preprocess=0; 219 if(!index(buf,'\n')) 220 ungetc('#',f_in); /* It was longer */ 221 else 222 ungetc('\n',f_in); 223 } else if(c=='\n') 224 ungetc('\n',f_in); 225 else 226 ungetc('#',f_in); 227 } else 228 ungetc(c,f_in); 229 230 #ifdef DONTDEF 231 if ( preprocess ) { 232 char temporary_file_name [17]; 233 char *mktemp(); 234 FILE *f_out; 235 236 (void)strcpy (temporary_file_name, "/tmp/#appXXXXXX"); 237 (void)mktemp (temporary_file_name); 238 f_out=fopen(temporary_file_name,"w+"); 239 if(f_out==(FILE *)0) 240 as_perror("Can't open temp file %s",temporary_file_name); 241 242 /* JF this will have to be moved on any system that 243 does not support removal of open files. */ 244 (void)unlink(temporary_file_name);/* JF do it NOW */ 245 do_scrub(f_in,f_out); 246 (void)fclose(f_in); /* All done with it */ 247 (void)rewind(f_out); 248 f_in=f_out; 249 } 250 #endif 251 } 252 #endif 253 254 char * 255 input_file_give_next_buffer (where) 256 char * where; /* Where to place 1st character of new buffer. */ 257 { 258 char * return_value; /* -> Last char of what we read, + 1. */ 259 register int size; 260 261 if (f_in == (FILE *)0) 262 return 0; 263 /* 264 * fflush (stdin); could be done here if you want to synchronise 265 * stdin and stdout, for the case where our input file is stdin. 266 * Since the assembler shouldn't do any output to stdout, we 267 * don't bother to synch output and input. 268 */ 269 /* size = read (file_handle, where, BUFFER_SIZE); */ 270 if(preprocess) { 271 char *p; 272 int n; 273 int ch; 274 extern FILE *scrub_file; 275 int scrub_from_file(); 276 void scrub_to_file(); 277 int do_scrub_next_char(); 278 279 scrub_file=f_in; 280 for(p=where,n=BUFFER_SIZE;n;--n) { 281 ch=do_scrub_next_char(scrub_from_file,scrub_to_file); 282 if(ch==EOF) 283 break; 284 *p++=ch; 285 } 286 size=BUFFER_SIZE-n; 287 } else 288 size= fread(where,sizeof(char),BUFFER_SIZE,f_in); 289 if (size < 0) 290 { 291 as_perror ("Can't read from %s", file_name); 292 size = 0; 293 } 294 if (size) 295 return_value = where + size; 296 else 297 { 298 if (fclose (f_in)) 299 as_perror ("Can't close %s", file_name); 300 f_in = (FILE *)0; 301 return_value = 0; 302 } 303 return (return_value); 304 } 305 306 /* end: input_file.c */ 307