static char rcsid[] = "@(#)$Id: builtin.c,v 5.4 1994/05/30 16:42:48 syd Exp $"; /******************************************************************************* * The Elm Mail System - $Revision: 5.4 $ $State: Exp $ * * Copyright (c) 1988-1992 USENET Community Trust * Copyright (c) 1986,1987 Dave Taylor ******************************************************************************* * Bug reports, patches, comments, suggestions should be sent to: * * Syd Weinstein, Elm Coordinator * elm@DSI.COM dsinc!elm * ******************************************************************************* * $Log: builtin.c,v $ * Revision 5.4 1994/05/30 16:42:48 syd * Just a minor fix to an impossible character comparison. * From: Jukka Ukkonen * * Revision 5.3 1994/05/15 22:55:25 syd * I had to put in some changes to builtin+ to allow it to display * 8-bit letters as they should when the message has been sent * through a real 8-bit channel like ESMTP with 8bit MIME Content- * Transfer-Encoding. * From: Jukka Ukkonen * * Revision 5.2 1993/08/03 19:28:39 syd * Elm tries to replace the system toupper() and tolower() on current * BSD systems, which is unnecessary. Even worse, the replacements * collide during linking with routines in isctype.o. This patch adds * a Configure test to determine whether replacements are really needed * (BROKE_CTYPE definition). The header file is now included * globally through hdrs/defs.h and the BROKE_CTYPE patchup is handled * there. Inclusion of was removed from *all* the individual * files, and the toupper() and tolower() routines in lib/opt_utils.c * were dropped. * From: chip@chinacat.unicom.com (Chip Rosenthal) * * Revision 5.1 1992/10/03 22:58:40 syd * Initial checkin as of 2.4 Release at PL0 * * ******************************************************************************/ /** This is the built-in pager for displaying messages while in the Elm program. It's a bare-bones pager with precious few options. The idea is that those systems that are sufficiently slow that using an external pager such as 'more' is too slow, then they can use this! Also added support for the "builtin+" pager (clears the screen for each new page) including a two-line overlap for context... **/ #include "headers.h" #include "s_elm.h" #define BEEP 007 /* ASCII Bell character */ static unfilled_lines, form_title; int lines_displayed, /* total number of lines displayed */ total_lines_to_display, /* total number of lines in message */ pages_displayed; /* for the nth page titles and all */ start_builtin(lines_in_message) int lines_in_message; { /** clears the screen and resets the internal counters... **/ dprint(8,(debugfile, "displaying %d lines from message using internal pager\n", lines_in_message)); unfilled_lines = LINES; form_title = 1; lines_displayed = 0; pages_displayed = 1; total_lines_to_display = lines_in_message; } extern int tabspacing; int next_line(inputptr, inputlenptr, output, outputlenptr, width) char **inputptr, *output; register unsigned width; int *inputlenptr, *outputlenptr; { /* Copy characters from input to output and copy * remainder of output to output. In copying use ^X notation for * control characters, '?' non-ascii characters, expand tabs * to correct number of spaces till next tab stop. * Column zero of the next line is considered to be the tab stop * that follows the last one that fits on a line. * Copy until newline/return encountered, null char encountered, * width characters producted in output buffer. * Formfeed is handled exceptionally. If encountered it * is removed from input and 1 is returned. Otherwise 0 is returned. */ register char *optr, *iptr; register unsigned chars_output, nt; int ret_val; int ilen = *inputlenptr; optr = output; iptr = *inputptr; chars_output = 0; ret_val = 0; /* presume no formfeed */ while(ilen > 0) { /* while there is something */ if(chars_output >= width) { /* no more room on line */ *optr++ = '\r'; *optr++ = '\n'; /* if next input character is newline or return, * we can skip over it since we are outputing a newline anyway */ if((*iptr == '\n') || (*iptr == '\r')) { iptr++; --ilen; } break; } else if (*iptr == '\n' || *iptr == '\r') { /*newline or return */ *optr++ = '\r'; *optr++ = '\n'; iptr++; --ilen; break; /* end of line */ } else if(*iptr == '\f') { /* formfeed */ /* if next input character is newline or return, * we can skip over it since we are outputing a formfeed anyway */ if((*++iptr == '\n') || (*iptr == '\r')) { iptr++; --ilen; } --ilen; ret_val = 1; break; /* leave rest of screen clear */ } else if(*iptr == '\t') { /* tab stop */ if((nt=next_tab(chars_output+1)) > width) { *optr++ = '\n'; /* won't fit on this line - autowrap */ *optr++ = '\r'; /* tab by tabbing so-to-speak to 1st */ iptr++; /* column of next line */ --ilen; break; } else { /* will fit - output proper num of spaces */ while(chars_output < nt-1) { chars_output++; *optr++ = ' '; } iptr++; --ilen; } } else if(iscntrl(*iptr & 0xff)) { /* Non-white ctrl char */ if (chars_output + 2 <= width) { *optr++ = '^'; *optr++ = ctrl(*iptr); iptr++; --ilen; chars_output += 2; } else { break; } } else { /* Assume a printing char in case isprint */ *optr++ = *iptr++; /* macro fails on true 8-bit characters. */ chars_output++; --ilen; } } *optr = '\0'; *inputptr = iptr; *inputlenptr = ilen; *outputlenptr = chars_output; return(ret_val); } int display_line(input_line, input_size) char *input_line; int input_size; { int percent_done; /** Display the given line on the screen, taking into account such dumbness as wraparound and such. If displaying this would put us at the end of the screen, put out the "MORE" prompt and wait for some input. Return non-zero if the user terminates the paging (e.g. 'i') or zero if we should continue. Also, this will pass back the value of any character the user types in at the prompt instead, if needed... (e.g. if it can't deal with it at this point) **/ char *pending, footer[SLEN], display_buffer[SLEN]; int ch, formfeed, lines_more; int pending_len = input_size, display_len = 0; #ifdef MMDF if (strcmp(input_line, MSG_SEPARATOR) == 0) strcpy(input_line," "); #endif /* MMDF */ pending = input_line; CarriageReturn(); do { /* while there is more space on the screen - leave prompt line free */ while(unfilled_lines > 0) { /* display a screen's lineful of the input line * and reset pending to point to remainder of input line */ formfeed = next_line(&pending, &pending_len, display_buffer, &display_len, COLUMNS); if(*display_buffer == '\0') { /* no line to display */ if(!formfeed) /* no "formfeed" to display * need more lines for screen */ return(FALSE); } else Write_to_screen(display_buffer, 0); /* if formfeed, clear remainder of screen */ if(formfeed) { CleartoEOS(); unfilled_lines=0; } else unfilled_lines--; /* if screen is not full (leave room for prompt) * but we've used up input line, return */ if(unfilled_lines > 0 && pending_len == 0) return(FALSE); /* we need more lines to fill screen */ /* otherwise continue to display next part of input line */ } /* screen is now full - prompt for user input */ lines_more = total_lines_to_display - lines_displayed; percent_done = (int)((100L * lines_displayed) / total_lines_to_display); if (user_level == 0) { if (lines_more == 1) MCsprintf(footer, catgets(elm_msg_cat, ElmSet, ElmMoreUser0, " There is 1 line left (%d%%). Press for more, or 'i' to return. "), percent_done); else MCsprintf(footer, catgets(elm_msg_cat, ElmSet, ElmMoreUser0Plural, " There are %d lines left (%d%%). Press for more, or 'i' to return. "), lines_more, percent_done); } else if (user_level == 1) { if (lines_more == 1) MCsprintf(footer, catgets(elm_msg_cat, ElmSet, ElmMoreUser1, " 1 line more (%d%%). Press for more, 'i' to return. "), percent_done); else MCsprintf(footer, catgets(elm_msg_cat, ElmSet, ElmMoreUser1Plural, " %d lines more (%d%%). Press for more, 'i' to return. "), lines_more, percent_done); } else { if (lines_more == 1) MCsprintf(footer, catgets(elm_msg_cat, ElmSet, ElmMoreUser2, " 1 line more (you've seen %d%%) "), percent_done); else MCsprintf(footer, catgets(elm_msg_cat, ElmSet, ElmMoreUser2Plural, " %d lines more (you've seen %d%%) "), lines_more, percent_done); } MoveCursor(LINES, 0); StartBold(); Write_to_screen(footer, 0); EndBold(); switch(ch = ReadCh()) { case '\n': case '\r': /* scroll down a line */ unfilled_lines = 1; ClearLine(LINES); break; case ' ': /* scroll a screenful */ unfilled_lines = LINES; if(clear_pages) { ClearScreen(); MoveCursor(0,0); CarriageReturn(); /* output title */ if(title_messages && filter) { title_for_page(++pages_displayed); unfilled_lines -= 2; } } else ClearLine(LINES); /* and keep last line to be first line of next * screenful unless we had a formfeed */ if(!formfeed) { if(clear_pages) Write_to_screen(display_buffer, 0); unfilled_lines--; } break; default: return(ch); } CarriageReturn(); } while(pending_len > 0); return(FALSE); } title_for_page(page) int page; { /** Output a nice title for the second thru last pages of the message we're currently reading. Note - this code is very similar to that which produces the title for the first page, except that page number replaces the date and the method by which it gets to the screen **/ static char title1[SLEN], title2[SLEN]; char titlebuf[SLEN], title3[SLEN], who[SLEN]; static t1_len, t2_len; register int padding, showing_to; /* format those parts of the title that are constant for a message */ if(form_title) { showing_to = tail_of(headers[current-1]->from, who, headers[current-1]->to); sprintf(title1, "%s %d/%d ", headers[current-1]->status & DELETED ? nls_deleted : headers[current-1]->status & FORM_LETTER ? nls_form: nls_message, current, message_count); t1_len = strlen(title1); sprintf(title2, "%s %s", showing_to? nls_to : nls_from, who); t2_len = strlen(title2); } /* format those parts of the title that vary between pages of a mesg */ sprintf(title3, nls_page, page); /* truncate or pad title2 portion on the right * so that line fits exactly to the rightmost column */ padding = COLUMNS - (t1_len + t2_len + strlen(title3)); sprintf(titlebuf, "%s%-*.*s%s\n\r\n\r", title1, t2_len+padding, t2_len+padding, title2, title3); /* extra newline is to give a blank line after title */ Write_to_screen(titlebuf, 0); form_title = 0; }