FreeCalypso > hg > freecalypso-tools
view rvinterf/asyncshell/help.c @ 951:297c7d5b57a2
doc/Rvinterf-logs: new document
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Wed, 07 Jun 2023 07:52:55 +0000 |
parents | 27d7d7e2d9bd |
children |
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/* * This module implements the fc-shell help facility. */ #include <stdio.h> #include <ctype.h> #include <string.h> #include <strings.h> #include <stdlib.h> char help_file_pathname[] = "/opt/freecalypso/helpfiles/fc-shell.help"; show_help_topic(topic) char *topic; { FILE *f; char linebuf[256]; char *cp, *np; int flag; f = fopen(help_file_pathname, "r"); if (!f) { perror(help_file_pathname); return(-1); } for (;;) { if (!fgets(linebuf, sizeof linebuf, f)) { printf("error: help topic \"%s\" not found\n", topic); fclose(f); return(-1); } if (linebuf[0] != '=' || linebuf[1] != '=' || linebuf[2] != '=') continue; for (cp = linebuf + 3; isspace(*cp); cp++) ; for (np = cp; *cp && !isspace(*cp); cp++) ; if (*cp) *cp++ = '\0'; if (!strcmp(np, topic)) break; } for (flag = 0; fgets(linebuf, sizeof linebuf, f); ) { if (linebuf[0] == '=' && linebuf[1] == '=' && linebuf[2] == '=') { if (flag) break; else continue; } fputs(linebuf, stdout); flag = 1; } fclose(f); return(0); } void cmd_help(argstr) char *argstr; { char *argv[3], dbltopic[34]; int argc, rc; rc = parse_interactive_command_into_argv(argstr, argv, 0, 2, &argc); if (rc < 0) return; switch (argc) { case 0: show_help_topic("main"); break; case 1: show_help_topic(argv[0]); break; case 2: if (strlen(argv[0]) <= 16 && strlen(argv[1]) <= 16) { sprintf(dbltopic, "%s:%s", argv[0], argv[1]); show_help_topic(dbltopic); } else printf("error: no such help topic\n"); break; default: fprintf(stderr, "internal error in cmd_help(): bad argc\n"); abort(); } }