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Annotation of 43BSDTahoe/ucb/pascal/pdx/tree/misc.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1980 Regents of the University of California.
        !             3:  * All rights reserved.  The Berkeley software License Agreement
        !             4:  * specifies the terms and conditions for redistribution.
        !             5:  */
        !             6: 
        !             7: #ifndef lint
        !             8: static char sccsid[] = "@(#)misc.c     5.2 (Berkeley) 4/7/87";
        !             9: #endif not lint
        !            10: 
        !            11: /*
        !            12:  * Miscellaneous commands "edit" and "help".
        !            13:  * Also, output redirection routine "setout" and "unsetout".
        !            14:  */
        !            15: 
        !            16: #include "defs.h"
        !            17: #include "tree.h"
        !            18: #include "command.h"
        !            19: #include "object.h"
        !            20: #include "mappings.h"
        !            21: #include "sym.h"
        !            22: #include "symtab.h"
        !            23: 
        !            24: extern char *getenv();
        !            25: 
        !            26: #define DEF_EDITOR     "vi"
        !            27: 
        !            28: /*
        !            29:  * Invoke an editor on the given file.  Which editor to use might change
        !            30:  * installation to installation.  For now, we use "vi".  In any event,
        !            31:  * the environment variable "EDITOR" overrides any default.
        !            32:  */
        !            33: 
        !            34: edit(filename)
        !            35: char *filename;
        !            36: {
        !            37:        char *ed;
        !            38:        FILE *fp;
        !            39:        SYM *s;
        !            40:        ADDRESS addr;
        !            41:        char buff[10];
        !            42: 
        !            43:        if ((ed = getenv("EDITOR")) == NIL) {
        !            44:                ed = DEF_EDITOR;
        !            45:        }
        !            46:        fp = fopen(filename, "r");
        !            47:        if (fp == NIL) {
        !            48:                s = st_lookup(symtab, filename);
        !            49:                if (s == NIL) {
        !            50:                        error("can't read \"%s\"", filename);
        !            51:                }
        !            52:                s = which(s);
        !            53:                if (!isblock(s)) {
        !            54:                        error("can't read \"%s\"", filename);
        !            55:                }
        !            56:                addr = firstline(s);
        !            57:                filename = srcfilename(addr);
        !            58:                sprintf(buff, "+%d", srcline(addr));
        !            59:                call(ed, stdin, stdout, buff, filename, NIL);
        !            60:        } else {
        !            61:                fclose(fp);
        !            62:                call(ed, stdin, stdout, filename, NIL);
        !            63:        }
        !            64: }
        !            65: 
        !            66: /*
        !            67:  * Send some nasty mail to the current pdx support person.
        !            68:  */
        !            69: 
        !            70: gripe()
        !            71: {
        !            72:        char *maintainer = "[email protected]";
        !            73: 
        !            74:        puts("Type control-D to end your message.  Be sure to include");
        !            75:        puts("your name and the name of the file you are debugging.");
        !            76:        putchar('\n');
        !            77:        call("Mail", stdin, stdout, maintainer, NIL);
        !            78:        puts("Thank you.");
        !            79: }
        !            80: 
        !            81: /*
        !            82:  * Give the user some help.
        !            83:  */
        !            84: 
        !            85: help()
        !            86: {
        !            87:        puts("pdx command subset summary:");
        !            88:        putchar('\n');
        !            89:        puts("run                    - begin execution of the program");
        !            90:        puts("cont                   - continue execution");
        !            91:        puts("step                   - single step one line");
        !            92:        puts("next                   - step to next line (skip over calls)");
        !            93:        puts("trace <line#>          - trace execution of the line");
        !            94:        puts("trace <proc>           - trace calls to the procedure");
        !            95:        puts("trace <var>            - trace changes to the variable");
        !            96:        puts("trace <exp> at <line#> - print <exp> when <line> is reached");
        !            97:        puts("stop at <line>         - suspend execution at the line");
        !            98:        puts("stop in <proc>         - suspend execution when <proc> is called");
        !            99:        puts("status                 - print trace/stop's in effect");
        !           100:        puts("delete <number>        - remove trace or stop of given number");
        !           101:        puts("call <proc>            - call the procedure");
        !           102:        puts("where                  - print currently active procedures");
        !           103:        puts("print <exp>            - print the value of the expression");
        !           104:        puts("whatis <name>          - print the declaration of the name");
        !           105:        puts("list <line>, <line>    - list source lines");
        !           106:        puts("edit <proc>            - edit file containing <proc>");
        !           107:        puts("gripe                  - send mail to the person in charge of pdx");
        !           108:        puts("quit                   - exit pdx");
        !           109: }
        !           110: 
        !           111: /*
        !           112:  * Divert output to the given file name.
        !           113:  * Cannot redirect to an existing file.
        !           114:  */
        !           115: 
        !           116: LOCAL int so_fd;
        !           117: LOCAL BOOLEAN notstdout;
        !           118: 
        !           119: setout(filename)
        !           120: char *filename;
        !           121: {
        !           122:        FILE *fp;
        !           123: 
        !           124:        if ((fp = fopen(filename, "r")) != NIL) {
        !           125:                fclose(fp);
        !           126:                error("%s: file already exists", filename);
        !           127:        } else {
        !           128:                so_fd = dup(1);
        !           129:                close(1);
        !           130:                if (creat(filename, 0666) == NIL) {
        !           131:                        unsetout();
        !           132:                        error("can't create %s", filename);
        !           133:                }
        !           134:                notstdout = TRUE;
        !           135:        }
        !           136: }
        !           137: 
        !           138: /*
        !           139:  * Revert output to standard output.
        !           140:  */
        !           141: 
        !           142: unsetout()
        !           143: {
        !           144:        fflush(stdout);
        !           145:        close(1);
        !           146:        if (dup(so_fd) != 1) {
        !           147:                panic("standard out dup failed");
        !           148:        }
        !           149:        close(so_fd);
        !           150:        notstdout = FALSE;
        !           151: }
        !           152: 
        !           153: BOOLEAN isredirected()
        !           154: {
        !           155:        return(notstdout);
        !           156: }

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