/* $OpenBSD: ex_txt.c,v 1.16 2016/05/27 09:18:12 martijn Exp $ */ /*- * Copyright (c) 1992, 1993, 1994 * The Regents of the University of California. All rights reserved. * Copyright (c) 1992, 1993, 1994, 1995, 1996 * Keith Bostic. All rights reserved. * * See the LICENSE file for redistribution information. */ #include "config.h" #include #include #include #include #include #include #include #include #include "../common/common.h" #include "../vi/vi.h" /* * !!! * The backslash characters was special when it preceded a newline as part of * a substitution replacement pattern. For example, the input ":a\" would * failed immediately with an error, as the wasn't part of a substitution * replacement pattern. This implies a frightening integration of the editor * and the parser and/or the RE engine. There's no way I'm going to reproduce * those semantics. * * So, if backslashes are special, this code inserts the backslash and the next * character into the string, without regard for the character or the command * being entered. Since "\" was illegal historically (except for the one * special case), and the command will fail eventually, no historical scripts * should break (presuming they didn't depend on the failure mode itself or the * characters remaining when failure occurred. */ static int txt_dent(SCR *, TEXT *); static void txt_prompt(SCR *, TEXT *, CHAR_T, u_int32_t); /* * ex_txt -- * Get lines from the terminal for ex. * * PUBLIC: int ex_txt(SCR *, TEXTH *, CHAR_T, u_int32_t); */ int ex_txt(SCR *sp, TEXTH *tiqh, CHAR_T prompt, u_int32_t flags) { EVENT ev; GS *gp; TEXT ait, *ntp, *tp; carat_t carat_st; size_t cnt; int rval; rval = 0; /* * Get a TEXT structure with some initial buffer space, reusing the * last one if it's big enough. (All TEXT bookkeeping fields default * to 0 -- text_init() handles this.) */ if (!TAILQ_EMPTY(tiqh)) { tp = TAILQ_FIRST(tiqh); if (TAILQ_NEXT(tp, q) || tp->lb_len < 32) { text_lfree(tiqh); goto newtp; } tp->len = 0; } else { newtp: if ((tp = text_init(sp, NULL, 0, 32)) == NULL) goto err; TAILQ_INSERT_HEAD(tiqh, tp, q); } /* Set the starting line number. */ tp->lno = sp->lno + 1; /* * If it's a terminal, set up autoindent, put out the prompt, and * set it up so we know we were suspended. Otherwise, turn off * the autoindent flag, as that requires less special casing below. * * XXX * Historic practice is that ^Z suspended command mode (but, because * it ran in cooked mode, it was unaffected by the autowrite option.) * On restart, any "current" input was discarded, whether in insert * mode or not, and ex was in command mode. This code matches historic * practice, but not 'cause it's easier. */ gp = sp->gp; if (F_ISSET(gp, G_SCRIPTED)) LF_CLR(TXT_AUTOINDENT); else { if (LF_ISSET(TXT_AUTOINDENT)) { LF_SET(TXT_EOFCHAR); if (v_txt_auto(sp, sp->lno, NULL, 0, tp)) goto err; } txt_prompt(sp, tp, prompt, flags); } for (carat_st = C_NOTSET;;) { if (v_event_get(sp, &ev, 0, 0)) goto err; /* Deal with all non-character events. */ switch (ev.e_event) { case E_CHARACTER: break; case E_ERR: goto err; case E_REPAINT: case E_WRESIZE: continue; case E_EOF: rval = 1; /* FALLTHROUGH */ case E_INTERRUPT: /* * Handle EOF/SIGINT events by discarding partially * entered text and returning. EOF returns failure, * E_INTERRUPT returns success. */ goto notlast; default: v_event_err(sp, &ev); goto notlast; } /* * Deal with character events. * * Check to see if the character fits into the input buffer. * (Use tp->len, ignore overwrite and non-printable chars.) */ BINC_GOTO(sp, tp->lb, tp->lb_len, tp->len + 1); switch (ev.e_value) { case K_CR: /* * !!! * Historically, 's in the command * weren't special, so the ex parser would return an * unknown command error message. However, if they * terminated the command if they were in a map. I'm * pretty sure this still isn't right, but it handles * what I've seen so far. */ if (!F_ISSET(&ev.e_ch, CH_MAPPED)) goto ins_ch; /* FALLTHROUGH */ case K_NL: /* * '\' can escape /. We * don't discard the backslash because we need it * to get the through the ex parser. */ if (LF_ISSET(TXT_BACKSLASH) && tp->len != 0 && tp->lb[tp->len - 1] == '\\') goto ins_ch; /* * CR returns from the ex command line. * * XXX * Terminate with a nul, needed by filter. */ if (LF_ISSET(TXT_CR)) { tp->lb[tp->len] = '\0'; goto done; } /* * '.' may terminate text input mode; free the current * TEXT. */ if (LF_ISSET(TXT_DOTTERM) && tp->len == tp->ai + 1 && tp->lb[tp->len - 1] == '.') { notlast: TAILQ_REMOVE(tiqh, tp, q); text_free(tp); goto done; } /* Set up bookkeeping for the new line. */ if ((ntp = text_init(sp, NULL, 0, 32)) == NULL) goto err; ntp->lno = tp->lno + 1; /* * Reset the autoindent line value. 0^D keeps the ai * line from changing, ^D changes the level, even if * there were no characters in the old line. Note, if * using the current tp structure, use the cursor as * the length, the autoindent characters may have been * erased. */ if (LF_ISSET(TXT_AUTOINDENT)) { if (carat_st == C_NOCHANGE) { if (v_txt_auto(sp, OOBLNO, &ait, ait.ai, ntp)) goto err; free(ait.lb); } else if (v_txt_auto(sp, OOBLNO, tp, tp->len, ntp)) goto err; carat_st = C_NOTSET; } txt_prompt(sp, ntp, prompt, flags); /* * Swap old and new TEXT's, and insert the new TEXT * into the queue. */ tp = ntp; TAILQ_INSERT_TAIL(tiqh, tp, q); break; case K_CARAT: /* Delete autoindent chars. */ if (tp->len <= tp->ai && LF_ISSET(TXT_AUTOINDENT)) carat_st = C_CARATSET; goto ins_ch; case K_ZERO: /* Delete autoindent chars. */ if (tp->len <= tp->ai && LF_ISSET(TXT_AUTOINDENT)) carat_st = C_ZEROSET; goto ins_ch; case K_CNTRLD: /* Delete autoindent char. */ /* * !!! * Historically, the ^D command took (but then ignored) * a count. For simplicity, we don't return it unless * it's the first character entered. The check for len * equal to 0 is okay, TXT_AUTOINDENT won't be set. */ if (LF_ISSET(TXT_CNTRLD)) { for (cnt = 0; cnt < tp->len; ++cnt) if (!isblank(tp->lb[cnt])) break; if (cnt == tp->len) { tp->len = 1; tp->lb[0] = ev.e_c; tp->lb[1] = '\0'; /* * Put out a line separator, in case * the command fails. */ (void)putchar('\n'); goto done; } } /* * POSIX 1003.1b-1993, paragraph 7.1.1.9, states that * the EOF characters are discarded if there are other * characters to process in the line, i.e. if the EOF * is not the first character in the line. For this * reason, historic ex discarded the EOF characters, * even if occurring in the middle of the input line. * We match that historic practice. * * !!! * The test for discarding in the middle of the line is * done in the switch, because the CARAT forms are N+1, * not N. * * !!! * There's considerable magic to make the terminal code * return the EOF character at all. See that code for * details. */ if (!LF_ISSET(TXT_AUTOINDENT) || tp->len == 0) continue; switch (carat_st) { case C_CARATSET: /* ^^D */ if (tp->len > tp->ai + 1) continue; /* Save the ai string for later. */ ait.lb = NULL; ait.lb_len = 0; BINC_GOTO(sp, ait.lb, ait.lb_len, tp->ai); memcpy(ait.lb, tp->lb, tp->ai); ait.ai = ait.len = tp->ai; carat_st = C_NOCHANGE; goto leftmargin; case C_ZEROSET: /* 0^D */ if (tp->len > tp->ai + 1) continue; carat_st = C_NOTSET; leftmargin: (void)gp->scr_ex_adjust(sp, EX_TERM_CE); tp->ai = tp->len = 0; break; case C_NOTSET: /* ^D */ if (tp->len > tp->ai) continue; if (txt_dent(sp, tp)) goto err; break; default: abort(); } /* Clear and redisplay the line. */ (void)gp->scr_ex_adjust(sp, EX_TERM_CE); txt_prompt(sp, tp, prompt, flags); break; default: /* * See the TXT_BEAUTIFY comment in vi/v_txt_ev.c. * * Silently eliminate any iscntrl() character that was * not already handled specially, except for and * . */ ins_ch: if (LF_ISSET(TXT_BEAUTIFY) && iscntrl(ev.e_c) && ev.e_value != K_FORMFEED && ev.e_value != K_TAB) break; tp->lb[tp->len++] = ev.e_c; break; } } /* NOTREACHED */ done: return (rval); err: alloc_err: return (1); } /* * txt_prompt -- * Display the ex prompt, line number, ai characters. Characters had * better be printable by the terminal driver, but that's its problem, * not ours. */ static void txt_prompt(SCR *sp, TEXT *tp, CHAR_T prompt, u_int32_t flags) { /* Display the prompt. */ if (LF_ISSET(TXT_PROMPT)) (void)printf("%c", prompt); /* Display the line number. */ if (LF_ISSET(TXT_NUMBER) && O_ISSET(sp, O_NUMBER)) (void)printf("%6lu ", (u_long)tp->lno); /* Print out autoindent string. */ if (LF_ISSET(TXT_AUTOINDENT)) (void)printf("%.*s", (int)tp->ai, tp->lb); (void)fflush(stdout); } /* * txt_dent -- * Handle ^D outdents. * * Ex version of vi/v_ntext.c:txt_dent(). See that code for the (usual) * ranting and raving. This is a fair bit simpler as ^T isn't special. */ static int txt_dent(SCR *sp, TEXT *tp) { u_long sw, ts; size_t cno, off, scno, spaces, tabs; ts = O_VAL(sp, O_TABSTOP); sw = O_VAL(sp, O_SHIFTWIDTH); /* Get the current screen column. */ for (off = scno = 0; off < tp->len; ++off) if (tp->lb[off] == '\t') scno += COL_OFF(scno, ts); else ++scno; /* Get the previous shiftwidth column. */ cno = scno--; scno -= scno % sw; /* * Since we don't know what comes before the character(s) being * deleted, we have to resolve the autoindent characters . The * example is a , which doesn't take up a full shiftwidth * number of columns because it's preceded by s. This is * easy to get if the user sets shiftwidth to a value less than * tabstop, and then uses ^T to indent, and ^D to outdent. * * Count up spaces/tabs needed to get to the target. */ for (cno = 0, tabs = 0; cno + COL_OFF(cno, ts) <= scno; ++tabs) cno += COL_OFF(cno, ts); spaces = scno - cno; /* Make sure there's enough room. */ BINC_RET(sp, tp->lb, tp->lb_len, tabs + spaces + 1); /* Adjust the final ai character count. */ tp->ai = tabs + spaces; /* Enter the replacement characters. */ for (tp->len = 0; tabs > 0; --tabs) tp->lb[tp->len++] = '\t'; for (; spaces > 0; --spaces) tp->lb[tp->len++] = ' '; return (0); }