514 lines
12 KiB
C
514 lines
12 KiB
C
/* ELLE - Copyright 1982, 1984, 1987 by Ken Harrenstien, SRI International
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* This software is quasi-public; it may be used freely with
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* like software, but may NOT be sold or made part of licensed
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* products without permission of the author.
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*/
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/*
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* EEMAIN ELLE Main Command Loop
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*/
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#include "elle.h"
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#include <stdio.h>
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#if !(V6)
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#include <signal.h>
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#else
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#include "eesigs.h" /* Use this on V6 system */
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#endif /*V6*/
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char *argfile[MAXARGFILES]; /* Filename args at startup */
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extern int (*sbm_debug)();
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extern int (*sbv_debug)();
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int (*vfy_vec)(); /* If non-zero, routine to verify data
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* after each main-loop command */
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main (argc, argv)
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int argc;
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char **argv;
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{
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register int c; /* Current command character */
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register int i;
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static int waitct;
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extern int errsbm();
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#if SUN
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extern int sun_rdevf; /* from EESUN */
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#endif
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#ifdef STKMEM
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char stackm[STKMEM]; /* Allocate some unused stack space */
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#endif /*STKMEM*/
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sbv_debug = errsbm; /* Load with addrs of routine to */
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sbm_debug = errsbm; /* process SB and SBM errors. */
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#ifdef STKMEM
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sbm_init(&stackm[0],(SBMO)STKMEM); /* Initialize mem alloc rtns */
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#endif /*STKMEM*/
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#if SUN
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sun_main(&argc, argv); /* On SUN, invoke window startup */
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#endif /*SUN*/
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setbuf(stdout, (char *)NULL); /* Remove all stdio buffering */
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setbuf(stderr, (char *)NULL); /* in case of error reports. */
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waitct = 0; /* debugging */
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doargs(argc,argv); /* Set up args */
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initialize (); /* Initialize the editor */
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if (argfile[0]) /* shell line arg */
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find_file(argfile[0]);
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#if MAXARGFILES > 1
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if(argfile[1])
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{ f_2winds(); /* Make 2 windows, go to 2nd */
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i = 1;
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#if MAXARGFILES > 2
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for (; i < MAXARGFILES; ++i)
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#endif /* > 2 files */
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find_file(argfile[i]); /* Get further file(s) */
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f_othwind(); /* Move back to 1st window */
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}
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#endif /* > 1 file */
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redp(RD_SCREEN|RD_MODE); /* Clear and show mode line */
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setexit(0); /* catch for ints, ^G throws */
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/* -----------------------------------------------------------
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** ELLE MAIN LOOP
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**
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*/
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for (;;)
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{
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/* First set up default arg unless last cmd specified it */
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if(this_cmd != ARGCMD)
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{ exp = 1; /* Default arg is 1 */
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exp_p = 0; /* Say no explicit arg */
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last_cmd = this_cmd;
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}
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this_cmd = 0;
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askclr(); /* If stuff asked, say to clear it */
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if(cmd_wait())
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waitct++;
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else if(rd_type != 0)
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redisplay(); /* Redisplay if needed and no input */
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#if SUN
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sun_rdevf = 1; /* Allow mouse events on this input */
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#endif
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c = cmd_read(); /* Read an editor command */
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sayclr(); /* Ask to clear echo area cleverly */
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#if SUN
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if(c != -1) /* SUN may not have real input */
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#endif /* if mouse event happened. */
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cmd_xct(c); /* Execute the command char! */
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if(vfy_vec) /* If debugging, */
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(*vfy_vec)(1); /* verify data structs right away */
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}
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}
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char *prof_file; /* Can specify user profile filename */
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doargs(argc,argv)
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int argc;
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char **argv;
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{ register int cnt, c;
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register char **av;
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extern int tibfmsk;
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int argfiles = 0;
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int argsignored = 0;
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av = argv;
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cnt = argc;
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#if V6 /* V6 doesn't have environment thus no TERM var */
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/* Hack to force terminal type; analyze pgm name to get
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* possible ".type" suffix.
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*/
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if(cnt && (c = strlen(*av)))
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while(--c >= 0)
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{ switch(av[0][c])
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{ case '.':
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tv_stype = &av[0][c+1];
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case '/':
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break;
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default: continue;
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}
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break;
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}
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#endif /*V6*/
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while(--cnt > 0)
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{ ++av;
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if(*av[0] != '-') /* If not switch, */
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{ /* assume it's an input filename */
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if (argfiles < MAXARGFILES)
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argfile[argfiles++] = *av;
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else
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++argsignored;
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continue;
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}
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c = upcase(av[0][1]);
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switch(c) /* Switches without args */
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{ case 'I': /* Allow debug ints */
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dbg_isw = 1;
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continue;
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case '8': /* Ask for 8-bit input */
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tibfmsk = 0377;
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continue;
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case '7': /* Ask for 7-bit input */
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tibfmsk = 0177;
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continue;
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#if IMAGEN
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case 'R': /* Debug redisplay stuff */
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dbg_redp = 1;
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continue;
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#endif /*IMAGEN*/
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}
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if(--cnt <= 0)
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goto stop;
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++av;
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switch(c) /* Switches with args */
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{ case 'T': /* Terminal type */
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tv_stype = *av;
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break;
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case 'P':
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prof_file = *av;
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default:
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goto stop;
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}
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continue;
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stop: printf("ELLE: bad switch: %s\n",*av);
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exit(1);
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}
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if (argsignored > 0)
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{ printf("ELLE: more than %d file args, %d ignored.\n",
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MAXARGFILES, argsignored);
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sleep(2); /* Complain but continue after pause */
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}
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}
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int f_throw(); /* throw function */
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int bite_bag(); /* Error handling routine */
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int hup_exit(); /* Hangup handling routine */
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struct majmode ifunmode = { "Fundamental" };
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initialize () /* Initialization */
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{
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#if SUN
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extern int sun_winfd;
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#endif
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cur_mode = fun_mode = &ifunmode; /* Set current major mode */
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unrchf = pgoal = -1;
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if(!homedir)
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{
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#if V6
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extern char *logdir();
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homedir = logdir();
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#else /* V7 */
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homedir = getenv("HOME");
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#endif /*-V6*/
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}
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sbx_tset((chroff)0,0); /* Create swapout file */
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/* (Temporary hack, fix up later) */
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hoard(); /* Hoard a FD for write purposes */
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redp_init(); /* Set up the display routines */
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init_buf(); /* Set up initial buffers */
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set_profile(prof_file); /* Set up user profile */
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#if SUN
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if(sun_winfd) sun_init();
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#endif /*SUN*/
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/* Set up signal handlers */
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#if 0 /* not really used */
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signal (SIGQUIT, f_throw); /* Quit - on ^G */
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#endif
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#if !(MINIX)
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signal (SIGSYS, bite_bag); /* Bad arg to Sys call */
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#endif
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signal (SIGSEGV, bite_bag); /* Segmentation Violation */
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#if !(COHERENT)
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signal (SIGILL, bite_bag); /* Illegal Instruction interrupt */
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signal (SIGBUS, bite_bag); /* Bus Error interrupt */
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#endif /*-COHERENT*/
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#if !(TOPS20) /* T20 just detaches job */
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signal (SIGHUP, hup_exit); /* Terminal Hangup interrupt */
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#endif /*-TOPS20*/
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}
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/* NOTE: This routine is not actually used, because ELLE does not
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* allow interrupts to do anything.
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*/
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/* EFUN: "Error Throw" */
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f_throw () /* abort whatever is going on */
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{
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ring_bell ();
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curs_lin = -1000; /* make t_curpos do something */
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redp(RD_MOVE); /* crock: cursor seems to move, so fix it */
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signal(SIGQUIT, f_throw); /* rearm signal */
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/* unwind_stack(main); */
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reset(1); /* throw to main loop */
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}
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/* RING_BELL - General-purpose feeper when something goes wrong with
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* a function.
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*/
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ring_bell()
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{ t_bell(); /* Tell user something's wrong */
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#if FX_SKMAC
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f_ekmac(); /* Stop collecting keyboard macro if any */
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#endif /*FX_SKMAC*/
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}
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/* EFUN: "Return to Superior"
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* Behavior here is somewhat system-dependent. If it is possible to
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* suspend the process and continue later, we do not ask about modified
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* buffers. Otherwise, we do. Questioning can always be forced by using
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* the prefix ^U.
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* Note that here we try to be very careful about not letting the user
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* exit while buffers are still modified, since UNIX flushes the process
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* if we exit. Also, the code here conspires with sel_mbuf to rotate
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* through all modified buffers, complaining about a different one each time,
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* so that the user need not even know how to select a buffer!
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*/
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void f_retsup()
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{ register char *reply;
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register int c;
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register struct buffer *b, *b2;
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extern struct buffer *sel_mbuf();
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extern int tsf_pause;
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/* If we have capability of pausing and later continuing, do that,
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* except if CTRL-U forces us into question/save/quit behavior.
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*/
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if(tsf_pause && (exp_p != 4))
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{ clean_exit(); /* Return TTY to normal mode */
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ts_pause(); /* Pause this inferior */
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set_tty(); /* Continued, return to edit mode */
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redp(RD_SCREEN);
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return;
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}
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/* Sigh, do more typical "Are you sure" questioning prior to
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* killing the editor permanently.
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*/
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b = cur_buf;
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if((b = sel_mbuf(b)) || (b = sel_mbuf((struct buffer *)0)) )
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{ if(b2 = sel_mbuf(b))
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reply = ask(
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"Quit: buffers %s, %s,... still have changes - forget them? ",
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b->b_name, b2->b_name);
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else
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reply = ask(
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"Quit: buffer %s still has changes - forget them? ",
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b->b_name);
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}
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else
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{
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#if IMAGEN /* Do not ask further if nothing modified */
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barf("Bye");
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clean_exit();
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exit(0);
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#else
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reply = ask("Quit? ");
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#endif /*-IMAGEN*/
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}
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if (reply == 0)
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return; /* Aborted, just return */
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c = upcase(*reply); /* Get 1st char of reply */
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chkfree(reply);
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switch(c)
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{ case 'Y':
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#if IMAGEN
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barf("Bye");
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#endif /*IMAGEN*/
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clean_exit();
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exit(0);
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#if 0
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case 'S': /* Suspend command for debugging */
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bkpt();
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return;
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#endif /*COMMENT*/
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default: /* Complain */
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ring_bell();
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case 'N':
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if(b) /* B set if we have any modified buffers */
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{ sel_buf(b);
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if(b->b_fn)
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saynow("Use ^X ^S to save buffer");
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else saynow("Use ^X ^W to write out buffer");
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}
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}
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}
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#if FX_WFEXIT
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/* EFUN: "Write File Exit" (not EMACS) - from IMAGEN config */
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void f_wfexit()
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{
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exp_p = 1; /* Ensure f_savefiles asks no questions */
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if (! f_savefiles()) /* Save all modified buffers, but */
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return; /* stay here if any save fails */
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saynow("Bye");
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clean_exit();
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exit(0);
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}
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#endif /*FX_WFEXIT*/
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/* Subprocess-handling stuff; put here for time being. */
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/* EFUN: "Push to Inferior" */
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#if TOPS20
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#include <frkxec.h> /* Support for KCC forkexec() call */
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#endif
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f_pshinf()
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{
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register int res;
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register int (*sav2)(), (*sav3)();
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int pid, status;
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char *shellname;
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#if IMAGEN
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char fullshell[64];
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#endif /*IMAGEN*/
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sav2 = signal(SIGINT, SIG_IGN); /* Ignore TTY interrupts */
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sav3 = signal(SIGQUIT, SIG_IGN); /* Ditto TTY "quit"s */
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clean_exit(); /* Restore normal TTY modes */
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#if TOPS20
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{
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struct frkxec fx;
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fx.fx_flags = FX_WAIT | FX_T20_PGMNAME;
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fx.fx_name = "SYS:EXEC.EXE";
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fx.fx_argv = fx.fx_envp = NULL;
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if (forkexec(&fx) < 0)
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writerr("Cannot run EXEC");
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}
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#else /*-TOPS20*/
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switch(pid = fork())
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{ case -1:
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writerr("Cannot fork");
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break;
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case 0: /* We're the child */
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for(res = 3; res < 20;) /* Don't let inf hack fd's */
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close(res++);
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#if V6
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execl("/bin/sh","-sh",0);
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#else
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signal(SIGINT, SIG_DFL); /* V7 shell wants this?? */
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signal(SIGQUIT, SIG_DFL); /* */
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#if IMAGEN
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if((shellname = getenv("SHELL")) == 0)
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shellname = "sh";
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strcpy(fullshell, "/bin/");
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strcat(fullshell, shellname);
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shellname = fullshell;
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#else
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if((shellname = getenv("SHELL")) == 0)
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shellname = "/bin/sh";
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#endif /*-IMAGEN*/
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if((shellname = getenv("SHELL")) == 0)
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shellname = "/bin/sh";
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execl(shellname, shellname, 0);
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#endif /*-V6*/
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writerr("No shell!");
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exit(1);
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break;
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default:
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while((res = wait(&status)) != pid && res != -1);
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break;
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}
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#endif /*-TOPS20*/
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signal(SIGINT, sav2); /* Restore signal settings */
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signal(SIGQUIT, sav3);
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set_tty(); /* Restore editor TTY modes */
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redp(RD_SCREEN|RD_MODE); /* Done, redisplay */
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}
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#if 0
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/* Miscellaneous utility routines - memory alloc/free and string hacking.
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* If this page becomes overly large, it can be split off into a separate
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* file called E_MISC.
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*/
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char *
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strdup(s)
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char *s; /* Note that STRCPY's return val must be its 1st arg */
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{ char *strcpy();
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return(strcpy(memalloc((SBMO)(strlen(s)+1)), s));
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}
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#endif
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char *
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memalloc(size)
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SBMO size;
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{ register SBMA ptr;
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extern SBMA sbx_malloc();
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if ((ptr = (SBMA)sbx_malloc(size)) != 0)
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return((char *)ptr);
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barf("ELLE: No memory left");
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askerr();
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return(0); /* If we dare to continue... */
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}
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chkfree (ptr)
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SBMA ptr;
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{
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if(!free(ptr))
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{ errbarf("Something overwrote an allocated block!");
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askerr();
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}
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}
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/* USTRCMP - Uppercase String Compare.
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* Returns 0 if mismatch,
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* 1 if full match,
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* -1 if str1 runs out first (partial match)
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*/
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ustrcmp(str1,str2)
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char *str1, *str2;
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{ register char *s1, *s2;
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register int c;
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s1 = str1; s2 = str2;
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while(c = *s1++)
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{ if(c != *s2 && upcase(c) != upcase(*s2))
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return(0);
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s2++;
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}
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return(c == *s2 ? 1 : -1);
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}
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/* WRITERR(str) - Output string to standard error output.
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** This is a separate routine to save a little space on calls.
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*/
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writerr(str)
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char *str;
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{ return(writez(2, str));
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}
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/* WRITEZ(fd, str) - Miscellaneous general-purpose string output.
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*/
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writez(fd,acp)
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int fd;
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char *acp;
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{ register char *cp;
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cp = acp;
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while(*cp++);
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write(fd,acp,cp-acp-1);
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}
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