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Annotation of 43BSDReno/games/adventure/save.c, revision 1.1

1.1     ! root        1: /* save (III)   J. Gillogly
        !             2:  * save user core image for restarting
        !             3:  * usage: save(<command file (argv[0] from main)>,<output file>)
        !             4:  * bugs
        !             5:  *   -  impure code (i.e. changes in instructions) is not handled
        !             6:  *      (but people that do that get what they deserve)
        !             7:  */
        !             8: 
        !             9: static char sccsid[] = "       save.c  4.3     89/03/05        ";
        !            10: 
        !            11: #include <sys/file.h>
        !            12: #include <a.out.h>
        !            13: int filesize;                    /* accessible to caller         */
        !            14: 
        !            15: char *sbrk();
        !            16: 
        !            17: save(cmdfile,outfile)                   /* save core image              */
        !            18: char *cmdfile,*outfile;
        !            19: {       register char *c;
        !            20:        register int i,fd;
        !            21:        int fdaout;
        !            22:        struct exec header;
        !            23:        int counter;
        !            24:        char buff[512],pwbuf[120];
        !            25:        fdaout = open(cmdfile, O_RDONLY, 0);    /* open command */
        !            26:        if (fdaout<0) return(-1);       /* can do nothing without text  */
        !            27:        if ((fd=creat(outfile,0755))== -1)
        !            28:        {       printf("Cannot create %s\n",outfile);
        !            29:                return(-1);
        !            30:        }
        !            31:        /* can get the text segment from the command that we were
        !            32:         * called with, and change all data from uninitialized to
        !            33:         * initialized.  It will start at the top again, so the user
        !            34:         * is responsible for checking whether it was restarted
        !            35:         * could ignore sbrks and breaks for the first pass
        !            36:         */
        !            37:        read(fdaout,&header,sizeof header);/* get the header       */
        !            38:        header.a_bss = 0;                  /* no data uninitialized        */
        !            39:        header.a_syms = 0;                 /* throw away symbol table      */
        !            40:        switch (header.a_magic)            /* find data segment            */
        !            41:        {   case 0407:                     /* non sharable code            */
        !            42:                c = (char *) header.a_text;/* data starts right after text */
        !            43:                header.a_data=sbrk(0)-c;   /* current size (incl allocs)   */
        !            44:                break;
        !            45:            case 0410:                     /* sharable code                */
        !            46:                c = (char *)
        !            47: #ifdef pdp11
        !            48:                    (header.a_text         /* starts after text            */
        !            49:                    & 0160000)             /* on an 8K boundary            */
        !            50:                    +  020000;             /* i.e. the next one up         */
        !            51: #endif
        !            52: #ifdef vax
        !            53:                    (header.a_text         /* starts after text            */
        !            54:                    & 037777776000)        /* on an 1K boundary            */
        !            55:                    +        02000;        /* i.e. the next one up         */
        !            56: #endif
        !            57: #ifdef tahoe
        !            58:                    (header.a_text         /* starts after text            */
        !            59:                    & 037777776000)        /* on an 1K boundary            */
        !            60:                    +        02000;        /* i.e. the next one up         */
        !            61: #endif
        !            62: #ifdef z8000
        !            63:                    (header.a_text         /* starts after text            */
        !            64:                    & 0174000)             /* on an 2K boundary            */
        !            65:                    +  004000;             /* i.e. the next one up         */
        !            66: #endif
        !            67:                header.a_data=sbrk(0)-c;   /* current size (incl allocs)   */
        !            68:                break;
        !            69:            case 0411:                     /* sharable with split i/d      */
        !            70:                c = 0;                     /* can't reach text             */
        !            71:                header.a_data=(int)sbrk(0);/* current size (incl allocs)   */
        !            72:                break;
        !            73:            case 0413:
        !            74:                c = (char *) header.a_text;/* starts after text            */
        !            75:                lseek(fdaout, 1024L, 0);   /* skip unused part of 1st block*/
        !            76:        }
        !            77:        if (header.a_data<0)               /* data area very big           */
        !            78:                return(-1);                /* fail for now                 */
        !            79: 
        !            80:        filesize=sizeof header+header.a_text+header.a_data;
        !            81:        write(fd,&header,sizeof header);   /* make the new header          */
        !            82:        if (header.a_magic==0413)
        !            83:                lseek(fd, 1024L, 0);       /* Start on 1K boundary         */
        !            84:        counter=header.a_text;             /* size of text                 */
        !            85:        while (counter>512)                /* copy 512-byte blocks         */
        !            86:        {       read(fdaout,buff,512);     /* as long as possible          */
        !            87:                write(fd,buff,512);
        !            88:                counter -= 512;
        !            89:        }
        !            90:        read(fdaout,buff,counter);         /* then pick up the rest        */
        !            91:        write(fd,buff,counter);
        !            92:        write(fd,c,header.a_data);         /* write all data in 1 glob     */
        !            93:        close(fd);
        !            94: }

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