1 /* input_file.c - Deal with Input Files - 2 Copyright (C) 1987 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 1, 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 #define NDEBUG /* JF remove asserts */ 28 29 #ifdef USG 30 #define index strchr 31 /* JF: What's the difference between _IOLBF and _IOFBF ? */ 32 #define setbuffer(stream, buf, size) setvbuf((stream), (buf), _IOFBF, (size)) 33 #endif 34 35 #include <stdio.h> 36 #include <assert.h> 37 /* #include <sys/types.h> 38 #include <sys/stat.h> 39 #include <sys/file.h> 40 #include <sys/wait.h> */ 41 42 /* #include "style.h" */ 43 #include "input-file.h" 44 45 /* This variable is non-zero if the file currently being read should be 46 preprocessed by app. It is zero if the file can be read straight in. 47 */ 48 int preprocess = 0; 49 50 void as_perror(); 51 52 /* 53 * This code opens a file, then delivers BUFFER_SIZE character 54 * chunks of the file on demand. 55 * BUFFER_SIZE is supposed to be a number chosen for speed. 56 * The caller only asks once what BUFFER_SIZE is, and asks before 57 * the nature of the input files (if any) is known. 58 */ 59 60 #define BUFFER_SIZE (32 * 1024) 61 62 static char in_buf[BUFFER_SIZE]; 63 64 /* 65 * We use static data: the data area is not sharable. 66 */ 67 68 FILE *f_in; /* JF do things the RIGHT way */ 69 /* static JF remove static so app.c can use file_name */ 70 char * file_name; 71 72 /* These hooks accomodate most operating systems. */ 73 74 void 75 input_file_begin () 76 { 77 /* file_handle = -1; */ 78 f_in = (FILE *)0; 79 } 80 81 void 82 input_file_end () 83 { 84 } 85 86 int /* Return BUFFER_SIZE. */ 87 input_file_buffer_size () 88 { 89 return (BUFFER_SIZE); 90 } 91 92 int 93 input_file_is_open () 94 { 95 /* return (file_handle >= 0); */ 96 return f_in!=(FILE *)0; 97 } 98 99 #ifdef DONTDEF /* JF save old version in case we need it */ 100 void 101 input_file_open (filename, preprocess, debugging) 102 char * filename; /* "" means use stdin. Must not be 0. */ 103 int preprocess; /* TRUE if needs app. */ 104 int debugging; /* TRUE if we are debugging assembler. */ 105 { 106 assert( filename != 0 ); /* Filename may not be NULL. */ 107 if (filename [0]) 108 { /* We have a file name. Suck it and see. */ 109 file_handle = open (filename, O_RDONLY, 0); 110 file_name = filename; 111 } 112 else 113 { /* use stdin for the input file. */ 114 file_handle = fileno (stdin); 115 file_name = "{standard input}"; /* For error messages. */ 116 } 117 if (file_handle < 0) 118 as_perror ("Can't open %s for reading", file_name); 119 if ( preprocess ) 120 { 121 /* 122 * This code was written in haste for a frobbed BSD 4.2. 123 * I have a flight to catch: will someone please do proper 124 * error checks? - Dean. 125 */ 126 int pid; 127 char temporary_file_name [12]; 128 int fd; 129 union wait status; 130 char *mktemp(); 131 132 (void)strcpy (temporary_file_name, "#appXXXXXX"); 133 (void)mktemp (temporary_file_name); 134 pid = vfork (); 135 if (pid == -1) 136 { 137 as_perror ("Vfork failed", file_name); 138 _exit (144); 139 } 140 if (pid == 0) 141 { 142 (void)dup2 (file_handle, fileno(stdin)); 143 fd = open (temporary_file_name, O_WRONLY + O_TRUNC + O_CREAT, 0666); 144 if (fd == -1) 145 { 146 (void)write(2,"Can't open temporary\n",21); 147 _exit (99); 148 } 149 (void)dup2 (fd, fileno(stdout)); 150 /* JF for testing #define PREPROCESSOR "/lib/app" */ 151 #define PREPROCESSOR "./app" 152 execl (PREPROCESSOR, PREPROCESSOR, 0); 153 execl ("app","app",0); 154 (void)write(2,"Exec of app failed. Get help.\n",31); 155 (void)unlink(temporary_file_name); 156 _exit (11); 157 } 158 (void)wait (& status); 159 if (status.w_status & 0xFF00) /* JF was 0xF000, was wrong */ 160 { 161 file_handle = -1; 162 as_warn( "Can't preprocess file \"%s\", status = %xx", file_name, status.w_status ); 163 } 164 else 165 { 166 file_handle = open (temporary_file_name, O_RDONLY, 0); 167 if ( ! debugging && unlink(temporary_file_name)) 168 as_perror ("Can't delete temp file %s", temporary_file_name); 169 } 170 if (file_handle == -1) 171 as_perror ("Can't retrieve temp file %s", temporary_file_name); 172 } 173 } 174 #else 175 176 void 177 input_file_open (filename,pre) 178 char * filename; /* "" means use stdin. Must not be 0. */ 179 int pre; 180 { 181 int c; 182 char buf[80]; 183 184 preprocess = pre; 185 186 assert( filename != 0 ); /* Filename may not be NULL. */ 187 if (filename [0]) { /* We have a file name. Suck it and see. */ 188 f_in=fopen(filename,"r"); 189 file_name=filename; 190 } else { /* use stdin for the input file. */ 191 f_in = stdin; 192 file_name = "{standard input}"; /* For error messages. */ 193 } 194 if (f_in==(FILE *)0) { 195 as_perror ("Can't open %s for reading", file_name); 196 return; 197 } 198 #ifndef VMS 199 setbuffer(f_in,in_buf,BUFFER_SIZE); 200 #endif /* VMS */ 201 c=getc(f_in); 202 if(c=='#') { /* Begins with comment, may not want to preprocess */ 203 c=getc(f_in); 204 if(c=='N') { 205 fgets(buf,80,f_in); 206 if(!strcmp(buf,"O_APP\n")) 207 preprocess=0; 208 if(!index(buf,'\n')) 209 ungetc('#',f_in); /* It was longer */ 210 else 211 ungetc('\n',f_in); 212 } else if(c=='\n') 213 ungetc('\n',f_in); 214 else 215 ungetc('#',f_in); 216 } else 217 ungetc(c,f_in); 218 219 #ifdef DONTDEF 220 if ( preprocess ) { 221 char temporary_file_name [17]; 222 char *mktemp(); 223 FILE *f_out; 224 225 (void)strcpy (temporary_file_name, "/tmp/#appXXXXXX"); 226 (void)mktemp (temporary_file_name); 227 f_out=fopen(temporary_file_name,"w+"); 228 if(f_out==(FILE *)0) 229 as_perror("Can't open temp file %s",temporary_file_name); 230 231 /* JF this will have to be moved on any system that 232 does not support removal of open files. */ 233 (void)unlink(temporary_file_name);/* JF do it NOW */ 234 do_scrub(f_in,f_out); 235 (void)fclose(f_in); /* All done with it */ 236 (void)rewind(f_out); 237 f_in=f_out; 238 } 239 #endif 240 } 241 #endif 242 243 char * 244 input_file_give_next_buffer (where) 245 char * where; /* Where to place 1st character of new buffer. */ 246 { 247 char * return_value; /* -> Last char of what we read, + 1. */ 248 register int size; 249 250 if (f_in == (FILE *)0) 251 return 0; 252 /* 253 * fflush (stdin); could be done here if you want to synchronise 254 * stdin and stdout, for the case where our input file is stdin. 255 * Since the assembler shouldn't do any output to stdout, we 256 * don't bother to synch output and input. 257 */ 258 /* size = read (file_handle, where, BUFFER_SIZE); */ 259 if(preprocess) { 260 char *p; 261 int n; 262 int ch; 263 extern FILE *scrub_file; 264 int scrub_from_file(); 265 void scrub_to_file(); 266 int do_scrub_next_char(); 267 268 scrub_file=f_in; 269 for(p=where,n=BUFFER_SIZE;n;--n) { 270 ch=do_scrub_next_char(scrub_from_file,scrub_to_file); 271 if(ch==EOF) 272 break; 273 *p++=ch; 274 } 275 size=BUFFER_SIZE-n; 276 } else 277 size= fread(where,sizeof(char),BUFFER_SIZE,f_in); 278 if (size < 0) 279 { 280 as_perror ("Can't read from %s", file_name); 281 size = 0; 282 } 283 if (size) 284 return_value = where + size; 285 else 286 { 287 if (fclose (f_in)) 288 as_perror ("Can't close %s", file_name); 289 f_in = (FILE *)0; 290 return_value = 0; 291 } 292 return (return_value); 293 } 294 295 /* end: input_file.c */ 296