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1 /*
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2 * Display some help.
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3 * Just invoke another "less" to display the help file.
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4 *
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5 * {{ This makes this function very simple, and makes changing the
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6 * help file very easy, but it may present difficulties on
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7 * (non-Unix) systems which do not supply the "system()" function. }}
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8 */
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9
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10 #include "less.h"
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11
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12 #if __MSDOS__
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13 #include <io.h>
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14 #include <dir.h>
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15 #include <string.h>
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16 #include <stdlib.h>
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17 extern int output_mode;
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18 #endif
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19
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20 extern char *progname;
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21
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22 public void
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23 help()
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24 {
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25 char *helpfile;
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26 char *cmd;
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27
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28 helpfile = find_helpfile();
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29 if (helpfile == NULL)
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30 {
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31 error("Cannot find help file", NULL_PARG);
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32 return;
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33 }
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34 #if __MSDOS__
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35 putenv("LESS=-+v -+E -+s -mHPmHELP -- ?eEND -- Press g to see "
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36 "it again:Press RETURN for more., or q when done ");
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37 cmd = (char *) ecalloc(strlen(helpfile) + strlen(progname) + 50,
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38 sizeof(char));
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39 if (output_mode == 0)
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40 sprintf(cmd, "-%s %s", progname, helpfile);
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41 else
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42 sprintf(cmd, "-%s -qVW4,4,76,23,Help %s", progname, helpfile);
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43 #else
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44 cmd = (char *) ecalloc(strlen(helpfile) + strlen(progname) + 150,
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45 sizeof(char));
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46 sprintf(cmd,
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47 "-%s -m -H -+E -+s '-PmHELP -- ?eEND -- Press g to see it again:Press RETURN for more., or q when done ' %s",
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48 progname, helpfile);
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49 #endif
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50 free(helpfile);
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51 lsystem(cmd);
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52 error("End of help", NULL_PARG);
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53 free(cmd);
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54 }
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