| 1 | /* Copyright (c) 1979 Regents of the University of California */ |
| 2 | |
| 3 | static char sccsid[] = "@(#)int.c 1.1 %G%"; |
| 4 | |
| 5 | /* |
| 6 | * px - interpreter for Berkeley Pascal |
| 7 | * Version 3.0 Winter 1979 |
| 8 | * |
| 9 | * Original version for the PDP 11/70 authored by: |
| 10 | * Bill Joy, Charles Haley, Ken Thompson |
| 11 | * |
| 12 | * Rewritten for VAX 11/780 by Kirk McKusick |
| 13 | */ |
| 14 | |
| 15 | #include <signal.h> |
| 16 | #include "vars.h" |
| 17 | #include "objfmt.h" |
| 18 | |
| 19 | main(ac,av) |
| 20 | |
| 21 | long ac; |
| 22 | char **av; |
| 23 | |
| 24 | { |
| 25 | register long bytesread, block; |
| 26 | register char *objprog, *file; |
| 27 | register FILE *prog; |
| 28 | struct pxhdr pxhd; |
| 29 | #define pipe 3 |
| 30 | #define pipesize 4096 |
| 31 | |
| 32 | /* |
| 33 | * Initialize everything |
| 34 | */ |
| 35 | _argc = ac; |
| 36 | _argv = av; |
| 37 | _nodump = 0; |
| 38 | \f |
| 39 | /* |
| 40 | * Determine how PX was invoked, and how to process the program |
| 41 | */ |
| 42 | if (_argv[0][0] == '-' && _argv[0][1] == 'o') |
| 43 | { |
| 44 | file = &_argv[0][2]; |
| 45 | _mode = PIX; |
| 46 | } |
| 47 | else if (_argc <= 1) |
| 48 | { |
| 49 | file = "obj"; |
| 50 | _mode = PX; |
| 51 | } |
| 52 | else if (_argv[1][0] != '-') |
| 53 | { |
| 54 | file = _argv[1]; |
| 55 | _mode = PX; |
| 56 | } |
| 57 | else if (_argv[1][1] == 0) |
| 58 | { |
| 59 | file = _argv[0]; |
| 60 | _mode = PIPE; |
| 61 | _argc -= 1; |
| 62 | _argv[1] = _argv[0]; |
| 63 | _argv = &_argv[1]; |
| 64 | } |
| 65 | else |
| 66 | { |
| 67 | fputs("Improper specification of object file to PX\n",stderr); |
| 68 | exit(1); |
| 69 | } |
| 70 | \f |
| 71 | /* |
| 72 | * Process program header information |
| 73 | */ |
| 74 | if (_mode == PIPE) |
| 75 | read(pipe,&pxhd,sizeof(struct pxhdr)); |
| 76 | else |
| 77 | { |
| 78 | prog = fopen(file,"r"); |
| 79 | if (prog == NULL) |
| 80 | { |
| 81 | perror(file); |
| 82 | exit(1); |
| 83 | } |
| 84 | fseek(prog,HEADER_BYTES-sizeof(struct pxhdr),0); |
| 85 | fread(&pxhd,sizeof(struct pxhdr),1,prog); |
| 86 | } |
| 87 | if (pxhd.maketime < createtime) |
| 88 | { |
| 89 | fprintf(stderr,"%s is obsolete and must be recompiled\n",file); |
| 90 | exit(1); |
| 91 | } |
| 92 | if (pxhd.magicnum != 0403) |
| 93 | { |
| 94 | fprintf(stderr,"%s is not a Pascal program\n",file); |
| 95 | exit(1); |
| 96 | } |
| 97 | \f |
| 98 | /* |
| 99 | * Load program into memory |
| 100 | */ |
| 101 | objprog = malloc(pxhd.objsize); |
| 102 | if (_mode == PIPE) |
| 103 | { |
| 104 | bytesread = 0; |
| 105 | do |
| 106 | { |
| 107 | block = read(pipe,objprog+bytesread,pipesize); |
| 108 | bytesread += block; |
| 109 | } |
| 110 | while (block); |
| 111 | } |
| 112 | else |
| 113 | { |
| 114 | bytesread = fread(objprog,1,pxhd.objsize,prog); |
| 115 | fclose(prog); |
| 116 | if (_mode == PIX) |
| 117 | unlink(file); |
| 118 | } |
| 119 | if (bytesread != pxhd.objsize) |
| 120 | { |
| 121 | fprintf(stderr,"Read error occurred while loading %s\n",file); |
| 122 | exit(1); |
| 123 | } |
| 124 | if (_mode == PIX) |
| 125 | fputs("Execution begins...\n",stderr); |
| 126 | /* |
| 127 | * set interpreter to catch expected signals and begin interpretation |
| 128 | */ |
| 129 | signal(SIGILL,syserr); |
| 130 | signal(SIGBUS,syserr); |
| 131 | signal(SIGSYS,syserr); |
| 132 | if (signal(SIGINT,SIG_IGN) != SIG_IGN) |
| 133 | signal(SIGINT,intr); |
| 134 | signal(SIGSEGV,memsize); |
| 135 | signal(SIGFPE,except); |
| 136 | signal(SIGTRAP,liberr); |
| 137 | interpreter(objprog); |
| 138 | /* |
| 139 | * reset signals, deallocate memory, and exit normally |
| 140 | */ |
| 141 | signal(SIGINT,SIG_IGN); |
| 142 | signal(SIGSEGV,SIG_DFL); |
| 143 | signal(SIGFPE,SIG_DFL); |
| 144 | signal(SIGTRAP,SIG_DFL); |
| 145 | signal(SIGILL,SIG_DFL); |
| 146 | signal(SIGBUS,SIG_DFL); |
| 147 | signal(SIGSYS,SIG_DFL); |
| 148 | PFLUSH(); |
| 149 | /* pfree(objprog); */ |
| 150 | psexit(0); |
| 151 | } |