FreeCalypso > hg > freecalypso-tools

annotate rvinterf/asyncshell/help.c @ 452:688380565e0f

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rvinterf/asyncshell/helpfile: unterm addition documented
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 08 Feb 2019 02:14:53 +0000
parents 27d7d7e2d9bd
children
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1 /*
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2 * This module implements the fc-shell help facility.
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3 */
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4
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5 #include <stdio.h>
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6 #include <ctype.h>
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7 #include <string.h>
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8 #include <strings.h>
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9 #include <stdlib.h>
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10
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27d7d7e2d9bd rvinterf/asyncshell/help.c: new help file location
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11 char help_file_pathname[] = "/opt/freecalypso/helpfiles/fc-shell.help";
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12
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13 show_help_topic(topic)
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14 char *topic;
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15 {
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16 FILE *f;
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17 char linebuf[256];
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18 char *cp, *np;
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19 int flag;
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20
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21 f = fopen(help_file_pathname, "r");
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22 if (!f) {
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23 perror(help_file_pathname);
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24 return(-1);
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25 }
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26 for (;;) {
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27 if (!fgets(linebuf, sizeof linebuf, f)) {
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28 printf("error: help topic \"%s\" not found\n", topic);
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29 fclose(f);
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30 return(-1);
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31 }
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32 if (linebuf[0] != '=' || linebuf[1] != '=' || linebuf[2] != '=')
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33 continue;
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34 for (cp = linebuf + 3; isspace(*cp); cp++)
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35 ;
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36 for (np = cp; *cp && !isspace(*cp); cp++)
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37 ;
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38 if (*cp)
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39 *cp++ = '\0';
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40 if (!strcmp(np, topic))
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41 break;
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42 }
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43 for (flag = 0; fgets(linebuf, sizeof linebuf, f); ) {
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44 if (linebuf[0] == '=' && linebuf[1] == '=' &&
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45 linebuf[2] == '=') {
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46 if (flag)
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47 break;
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48 else
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49 continue;
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50 }
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51 fputs(linebuf, stdout);
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52 flag = 1;
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53 }
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54 fclose(f);
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55 return(0);
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56 }
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57
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58 void
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59 cmd_help(argstr)
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60 char *argstr;
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61 {
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62 char *argv[3], dbltopic[34];
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63 int argc, rc;
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64
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65 rc = parse_interactive_command_into_argv(argstr, argv, 0, 2, &argc);
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66 if (rc < 0)
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67 return;
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68 switch (argc) {
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69 case 0:
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70 show_help_topic("main");
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71 break;
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72 case 1:
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73 show_help_topic(argv[0]);
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74 break;
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75 case 2:
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76 if (strlen(argv[0]) <= 16 && strlen(argv[1]) <= 16) {
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77 sprintf(dbltopic, "%s:%s", argv[0], argv[1]);
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78 show_help_topic(dbltopic);
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79 } else
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80 printf("error: no such help topic\n");
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81 break;
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82 default:
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83 fprintf(stderr, "internal error in cmd_help(): bad argc\n");
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84 abort();
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85 }
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86 }