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Annotation of src/usr.bin/less/help.c, Revision 1.1

1.1     ! etheisen    1: /*
        !             2:  * Copyright (c) 1984,1985,1989,1994,1995  Mark Nudelman
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms, with or without
        !             6:  * modification, are permitted provided that the following conditions
        !             7:  * are met:
        !             8:  * 1. Redistributions of source code must retain the above copyright
        !             9:  *    notice, this list of conditions and the following disclaimer.
        !            10:  * 2. Redistributions in binary form must reproduce the above copyright
        !            11:  *    notice in the documentation and/or other materials provided with
        !            12:  *    the distribution.
        !            13:  *
        !            14:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY
        !            15:  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            16:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
        !            17:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE
        !            18:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
        !            19:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
        !            20:  * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
        !            21:  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
        !            22:  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
        !            23:  * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
        !            24:  * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
        !            25:  */
        !            26:
        !            27:
        !            28: /*
        !            29:  * Display some help.
        !            30:  * Just invoke another "less" to display the help file.
        !            31:  *
        !            32:  * {{ This makes this function very simple, and makes changing the
        !            33:  *    help file very easy, but it may present difficulties on
        !            34:  *    (non-Unix) systems which do not supply the "system()" function. }}
        !            35:  */
        !            36:
        !            37: #include  "less.h"
        !            38:
        !            39: extern char *progname;
        !            40:
        !            41:        public void
        !            42: help(nomsg)
        !            43:        int nomsg;
        !            44: {
        !            45:        char *helpfile;
        !            46:        char *cmd;
        !            47:
        !            48:        helpfile = find_helpfile();
        !            49:        if (helpfile == NULL)
        !            50:        {
        !            51:                error("Cannot find help file", NULL_PARG);
        !            52:                return;
        !            53:        }
        !            54: #if !HAVE_SYSTEM
        !            55:        /*
        !            56:         * Just examine the help file.
        !            57:         */
        !            58:        (void) edit(helpfile);
        !            59: #else
        !            60:        /*
        !            61:         * Use lsystem() to invoke a new instance of less
        !            62:         * to view the help file.
        !            63:         */
        !            64: #if MSOFTC
        !            65:        putenv("LESS=-m -H -+E -+s -PmHELP -- ?eEND -- Press g to see it again:Press RETURN for more., or q when done");
        !            66:        cmd = (char *) ecalloc(strlen(helpfile) + strlen(progname) + 3,
        !            67:                                sizeof(char));
        !            68:        sprintf(cmd, "-%s %s", progname, helpfile);
        !            69: #else
        !            70:        cmd = (char *) ecalloc(strlen(helpfile) + strlen(progname) + 150,
        !            71:                                sizeof(char));
        !            72: #if OS2
        !            73:        sprintf(cmd,
        !            74:         "-%s -m -H -+E -+s \"-PmHELP -- ?eEND -- Press g to see it again:Press RETURN for more., or q when done \" %s",
        !            75:                progname, helpfile);
        !            76: #else
        !            77:        sprintf(cmd,
        !            78:         "-%s -m -H -+E -+s '-PmHELP -- ?eEND -- Press g to see it again:Press RETURN for more., or q when done ' %s",
        !            79:                progname, helpfile);
        !            80: #endif
        !            81: #endif
        !            82:        free(helpfile);
        !            83:        lsystem(cmd);
        !            84:        if (!nomsg)
        !            85:                error("End of help", NULL_PARG);
        !            86:        free(cmd);
        !            87: #endif
        !            88: }