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Annotation of 43BSDReno/usr.bin/tn3270/distribution/sys_dos/spintc.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1988 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted
        !             6:  * provided that the above copyright notice and this paragraph are
        !             7:  * duplicated in all such forms and that any documentation,
        !             8:  * advertising materials, and other materials related to such
        !             9:  * distribution and use acknowledge that the software was developed
        !            10:  * by the University of California, Berkeley.  The name of the
        !            11:  * University may not be used to endorse or promote products derived
        !            12:  * from this software without specific prior written permission.
        !            13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            15:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            16:  */
        !            17: 
        !            18: #ifndef lint
        !            19: static char sccsid[] = "@(#)spintc.c   4.1 (Berkeley) 12/4/88";
        !            20: #endif /* not lint */
        !            21: 
        !            22: #include <stdio.h>
        !            23: #include <dos.h>
        !            24: #include <stdlib.h>
        !            25: 
        !            26: #include "../general/general.h"
        !            27: #include "spint.h"
        !            28: 
        !            29: #define        PSP_ENVIRONMENT         0x2c
        !            30: #define        PSP_FCB1                0x5c
        !            31: #define        PSP_FCB2                0x6c
        !            32: 
        !            33: typedef struct {
        !            34:     int
        !            35:        environment,            /* Segment address of environment */
        !            36:        cmd_ptr_offset,         /* Offset of command to execute */
        !            37:        cmd_ptr_segment,        /* Segment where command lives */
        !            38:        fcb1_ptr_offset,        /* Offset of FCB 1 */
        !            39:        fcb1_ptr_segment,       /* Segment of FCB 1 */
        !            40:        fcb2_ptr_offset,        /* Offset of FCB 2 */
        !            41:        fcb2_ptr_segment;       /* Segment of FCB 2 */
        !            42: } ExecList;
        !            43: 
        !            44: 
        !            45: static int int_offset, int_segment;
        !            46: 
        !            47: 
        !            48: void
        !            49: spint_finish(spint)
        !            50: Spint *spint;
        !            51: {
        !            52:     union REGS regs;
        !            53:     struct SREGS sregs;
        !            54: 
        !            55:     if (spint->done == 0) {
        !            56:        return;                         /* Not done yet */
        !            57:     }
        !            58: 
        !            59:     /*
        !            60:      * Restore old interrupt handler.
        !            61:      */
        !            62: 
        !            63:     regs.h.ah = 0x25;
        !            64:     regs.h.al = spint->int_no;
        !            65:     regs.x.dx = int_offset;
        !            66:     sregs.ds = int_segment;
        !            67:     intdosx(&regs, &regs, &sregs);
        !            68: 
        !            69:     if (spint->regs.x.cflag) {
        !            70:        fprintf(stderr, "0x%x return code from EXEC.\n", spint->regs.x.ax);
        !            71:        spint->done = 1;
        !            72:        spint->rc = 99;
        !            73:        return;
        !            74:     }
        !            75: 
        !            76:     regs.h.ah = 0x4d;                  /* Get return code */
        !            77: 
        !            78:     intdos(&regs, &regs);
        !            79: 
        !            80:     spint->rc = regs.x.ax;
        !            81: }
        !            82: 
        !            83: void
        !            84: spint_continue(spint)
        !            85: Spint *spint;
        !            86: {
        !            87:     _spint_continue(spint);            /* Return to caller */
        !            88:     spint_finish(spint);
        !            89: }
        !            90: 
        !            91: 
        !            92: void
        !            93: spint_start(command, spint)
        !            94: char *command;
        !            95: Spint *spint;
        !            96: {
        !            97:     ExecList mylist;
        !            98:     char *comspec;
        !            99:     void _spint_int();
        !           100:     union REGS regs;
        !           101:     struct SREGS sregs;
        !           102: 
        !           103:     /*
        !           104:      * Get comspec.
        !           105:      */
        !           106:     comspec = getenv("COMSPEC");
        !           107:     if (comspec == 0) {                        /* Can't find where command.com is */
        !           108:        fprintf(stderr, "Unable to find COMSPEC in the environment.");
        !           109:        spint->done = 1;
        !           110:        spint->rc = 99; /* XXX */
        !           111:        return;
        !           112:     }
        !           113: 
        !           114:     /*
        !           115:      * Now, hook up our interrupt routine.
        !           116:      */
        !           117: 
        !           118:     regs.h.ah = 0x35;
        !           119:     regs.h.al = spint->int_no;
        !           120:     intdosx(&regs, &regs, &sregs);
        !           121: 
        !           122:     /* Save old routine */
        !           123:     int_offset = regs.x.bx;
        !           124:     int_segment = sregs.es;
        !           125: 
        !           126:     regs.h.ah = 0x25;
        !           127:     regs.h.al = spint->int_no;
        !           128:     regs.x.dx = (int) _spint_int;
        !           129:     segread(&sregs);
        !           130:     sregs.ds = sregs.cs;
        !           131:     intdosx(&regs, &regs, &sregs);
        !           132: 
        !           133:     /*
        !           134:      * Read in segment registers.
        !           135:      */
        !           136: 
        !           137:     segread(&spint->sregs);
        !           138: 
        !           139:     /*
        !           140:      * Set up registers for the EXEC call.
        !           141:      */
        !           142: 
        !           143:     spint->regs.h.ah = 0x4b;
        !           144:     spint->regs.h.al = 0;
        !           145:     spint->regs.x.dx = (int) comspec;
        !           146:     spint->sregs.es = spint->sregs.ds;         /* Superfluous, probably */
        !           147:     spint->regs.x.bx = (int) &mylist;
        !           148: 
        !           149:     /*
        !           150:      * Set up EXEC parameter list.
        !           151:      */
        !           152: 
        !           153:     ClearElement(mylist);
        !           154:     mylist.cmd_ptr_offset = (int) command;
        !           155:     mylist.cmd_ptr_segment = spint->sregs.ds;
        !           156:     mylist.fcb1_ptr_offset = PSP_FCB1;
        !           157:     mylist.fcb1_ptr_segment = _psp;
        !           158:     mylist.fcb2_ptr_offset = PSP_FCB2;
        !           159:     mylist.fcb2_ptr_segment = _psp;
        !           160:     mylist.environment = *((int far *)(((long)_psp<<16)|PSP_ENVIRONMENT));
        !           161: 
        !           162:     /*
        !           163:      * Call to assembly language routine to actually set up for
        !           164:      * the spint.
        !           165:      */
        !           166: 
        !           167:     _spint_start(spint);
        !           168: 
        !           169:     spint_finish(spint);
        !           170: }

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