diff options
Diffstat (limited to 'contrib/nvi/ex/ex.c')
| -rw-r--r-- | contrib/nvi/ex/ex.c | 2370 |
1 files changed, 2370 insertions, 0 deletions
diff --git a/contrib/nvi/ex/ex.c b/contrib/nvi/ex/ex.c new file mode 100644 index 0000000..f92d8f7 --- /dev/null +++ b/contrib/nvi/ex/ex.c @@ -0,0 +1,2370 @@ +/*- + * 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" + +#ifndef lint +static const char sccsid[] = "@(#)ex.c 10.57 (Berkeley) 10/10/96"; +#endif /* not lint */ + +#include <sys/types.h> +#include <sys/queue.h> +#include <sys/stat.h> +#include <sys/time.h> + +#include <bitstring.h> +#include <ctype.h> +#include <errno.h> +#include <fcntl.h> +#include <limits.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +#include "../common/common.h" +#include "../vi/vi.h" + +#if defined(DEBUG) && defined(COMLOG) +static void ex_comlog __P((SCR *, EXCMD *)); +#endif +static EXCMDLIST const * + ex_comm_search __P((char *, size_t)); +static int ex_discard __P((SCR *)); +static int ex_line __P((SCR *, EXCMD *, MARK *, int *, int *)); +static int ex_load __P((SCR *)); +static void ex_unknown __P((SCR *, char *, size_t)); + +/* + * ex -- + * Main ex loop. + * + * PUBLIC: int ex __P((SCR **)); + */ +int +ex(spp) + SCR **spp; +{ + EX_PRIVATE *exp; + GS *gp; + MSGS *mp; + SCR *sp; + TEXT *tp; + u_int32_t flags; + + sp = *spp; + gp = sp->gp; + exp = EXP(sp); + + /* Start the ex screen. */ + if (ex_init(sp)) + return (1); + + /* Flush any saved messages. */ + while ((mp = gp->msgq.lh_first) != NULL) { + gp->scr_msg(sp, mp->mtype, mp->buf, mp->len); + LIST_REMOVE(mp, q); + free(mp->buf); + free(mp); + } + + /* If reading from a file, errors should have name and line info. */ + if (F_ISSET(gp, G_SCRIPTED)) { + gp->excmd.if_lno = 1; + gp->excmd.if_name = "script"; + } + + /* + * !!! + * Initialize the text flags. The beautify edit option historically + * applied to ex command input read from a file. In addition, the + * first time a ^H was discarded from the input, there was a message, + * "^H discarded", that was displayed. We don't bother. + */ + LF_INIT(TXT_BACKSLASH | TXT_CNTRLD | TXT_CR); + for (;; ++gp->excmd.if_lno) { + /* Display status line and flush. */ + if (F_ISSET(sp, SC_STATUS)) { + if (!F_ISSET(sp, SC_EX_SILENT)) + msgq_status(sp, sp->lno, 0); + F_CLR(sp, SC_STATUS); + } + (void)ex_fflush(sp); + + /* Set the flags the user can reset. */ + if (O_ISSET(sp, O_BEAUTIFY)) + LF_SET(TXT_BEAUTIFY); + if (O_ISSET(sp, O_PROMPT)) + LF_SET(TXT_PROMPT); + + /* Clear any current interrupts, and get a command. */ + CLR_INTERRUPT(sp); + if (ex_txt(sp, &sp->tiq, ':', flags)) + return (1); + if (INTERRUPTED(sp)) { + (void)ex_puts(sp, "\n"); + (void)ex_fflush(sp); + continue; + } + + /* Initialize the command structure. */ + CLEAR_EX_PARSER(&gp->excmd); + + /* + * If the user entered a single carriage return, send + * ex_cmd() a separator -- it discards single newlines. + */ + tp = sp->tiq.cqh_first; + if (tp->len == 0) { + gp->excmd.cp = " "; /* __TK__ why not |? */ + gp->excmd.clen = 1; + } else { + gp->excmd.cp = tp->lb; + gp->excmd.clen = tp->len; + } + F_INIT(&gp->excmd, E_NRSEP); + + if (ex_cmd(sp) && F_ISSET(gp, G_SCRIPTED)) + return (1); + + if (INTERRUPTED(sp)) { + CLR_INTERRUPT(sp); + msgq(sp, M_ERR, "170|Interrupted"); + } + + /* + * If the last command caused a restart, or switched screens + * or into vi, return. + */ + if (F_ISSET(gp, G_SRESTART) || F_ISSET(sp, SC_SSWITCH | SC_VI)) { + *spp = sp; + break; + } + + /* If the last command switched files, we don't care. */ + F_CLR(sp, SC_FSWITCH); + + /* + * If we're exiting this screen, move to the next one. By + * definition, this means returning into vi, so return to the + * main editor loop. The ordering is careful, don't discard + * the contents of sp until the end. + */ + if (F_ISSET(sp, SC_EXIT | SC_EXIT_FORCE)) { + if (file_end(sp, NULL, F_ISSET(sp, SC_EXIT_FORCE))) + return (1); + *spp = screen_next(sp); + return (screen_end(sp)); + } + } + return (0); +} + +/* + * ex_cmd -- + * The guts of the ex parser: parse and execute a string containing + * ex commands. + * + * !!! + * This code MODIFIES the string that gets passed in, to delete quoting + * characters, etc. The string cannot be readonly/text space, nor should + * you expect to use it again after ex_cmd() returns. + * + * !!! + * For the fun of it, if you want to see if a vi clone got the ex argument + * parsing right, try: + * + * echo 'foo|bar' > file1; echo 'foo/bar' > file2; + * vi + * :edit +1|s/|/PIPE/|w file1| e file2|1 | s/\//SLASH/|wq + * + * or: vi + * :set|file|append|set|file + * + * For extra credit, try them in a startup .exrc file. + * + * PUBLIC: int ex_cmd __P((SCR *)); + */ +int +ex_cmd(sp) + SCR *sp; +{ + enum nresult nret; + EX_PRIVATE *exp; + EXCMD *ecp; + GS *gp; + MARK cur; + recno_t lno; + size_t arg1_len, discard, len; + u_int32_t flags; + long ltmp; + int at_found, gv_found; + int ch, cnt, delim, isaddr, namelen; + int newscreen, notempty, tmp, vi_address; + char *arg1, *p, *s, *t; + + gp = sp->gp; + exp = EXP(sp); + + /* + * We always start running the command on the top of the stack. + * This means that *everything* must be resolved when we leave + * this function for any reason. + */ +loop: ecp = gp->ecq.lh_first; + + /* If we're reading a command from a file, set up error information. */ + if (ecp->if_name != NULL) { + gp->if_lno = ecp->if_lno; + gp->if_name = ecp->if_name; + } + + /* + * If a move to the end of the file is scheduled for this command, + * do it now. + */ + if (F_ISSET(ecp, E_MOVETOEND)) { + if (db_last(sp, &sp->lno)) + goto rfail; + sp->cno = 0; + F_CLR(ecp, E_MOVETOEND); + } + + /* If we found a newline, increment the count now. */ + if (F_ISSET(ecp, E_NEWLINE)) { + ++gp->if_lno; + ++ecp->if_lno; + F_CLR(ecp, E_NEWLINE); + } + + /* (Re)initialize the EXCMD structure, preserving some flags. */ + CLEAR_EX_CMD(ecp); + + /* Initialize the argument structures. */ + if (argv_init(sp, ecp)) + goto err; + + /* Initialize +cmd, saved command information. */ + arg1 = NULL; + ecp->save_cmdlen = 0; + + /* Skip <blank>s, empty lines. */ + for (notempty = 0; ecp->clen > 0; ++ecp->cp, --ecp->clen) + if ((ch = *ecp->cp) == '\n') { + ++gp->if_lno; + ++ecp->if_lno; + } else if (isblank(ch)) + notempty = 1; + else + break; + + /* + * !!! + * Permit extra colons at the start of the line. Historically, + * ex/vi allowed a single extra one. It's simpler not to count. + * The stripping is done here because, historically, any command + * could have preceding colons, e.g. ":g/pattern/:p" worked. + */ + if (ecp->clen != 0 && ch == ':') { + notempty = 1; + while (--ecp->clen > 0 && (ch = *++ecp->cp) == ':'); + } + + /* + * Command lines that start with a double-quote are comments. + * + * !!! + * Historically, there was no escape or delimiter for a comment, e.g. + * :"foo|set was a single comment and nothing was output. Since nvi + * permits users to escape <newline> characters into command lines, we + * have to check for that case. + */ + if (ecp->clen != 0 && ch == '"') { + while (--ecp->clen > 0 && *++ecp->cp != '\n'); + if (*ecp->cp == '\n') { + F_SET(ecp, E_NEWLINE); + ++ecp->cp; + --ecp->clen; + } + goto loop; + } + + /* Skip whitespace. */ + for (; ecp->clen > 0; ++ecp->cp, --ecp->clen) { + ch = *ecp->cp; + if (!isblank(ch)) + break; + } + + /* + * The last point at which an empty line can mean do nothing. + * + * !!! + * Historically, in ex mode, lines containing only <blank> characters + * were the same as a single <carriage-return>, i.e. a default command. + * In vi mode, they were ignored. In .exrc files this was a serious + * annoyance, as vi kept trying to treat them as print commands. We + * ignore backward compatibility in this case, discarding lines that + * contain only <blank> characters from .exrc files. + * + * !!! + * This is where you end up when you're done a command, i.e. clen has + * gone to zero. Continue if there are more commands to run. + */ + if (ecp->clen == 0 && + (!notempty || F_ISSET(sp, SC_VI) || F_ISSET(ecp, E_BLIGNORE))) { + if (ex_load(sp)) + goto rfail; + ecp = gp->ecq.lh_first; + if (ecp->clen == 0) + goto rsuccess; + goto loop; + } + + /* + * Check to see if this is a command for which we may want to move + * the cursor back up to the previous line. (The command :1<CR> + * wants a <newline> separator, but the command :<CR> wants to erase + * the command line.) If the line is empty except for <blank>s, + * <carriage-return> or <eof>, we'll probably want to move up. I + * don't think there's any way to get <blank> characters *after* the + * command character, but this is the ex parser, and I've been wrong + * before. + */ + if (F_ISSET(ecp, E_NRSEP) && + ecp->clen != 0 && (ecp->clen != 1 || ecp->cp[0] != '\004')) + F_CLR(ecp, E_NRSEP); + + /* Parse command addresses. */ + if (ex_range(sp, ecp, &tmp)) + goto rfail; + if (tmp) + goto err; + + /* + * Skip <blank>s and any more colons (the command :3,5:print + * worked, historically). + */ + for (; ecp->clen > 0; ++ecp->cp, --ecp->clen) { + ch = *ecp->cp; + if (!isblank(ch) && ch != ':') + break; + } + + /* + * If no command, ex does the last specified of p, l, or #, and vi + * moves to the line. Otherwise, determine the length of the command + * name by looking for the first non-alphabetic character. (There + * are a few non-alphabetic characters in command names, but they're + * all single character commands.) This isn't a great test, because + * it means that, for the command ":e +cut.c file", we'll report that + * the command "cut" wasn't known. However, it makes ":e+35 file" work + * correctly. + * + * !!! + * Historically, lines with multiple adjacent (or <blank> separated) + * command separators were very strange. For example, the command + * |||<carriage-return>, when the cursor was on line 1, displayed + * lines 2, 3 and 5 of the file. In addition, the command " | " + * would only display the line after the next line, instead of the + * next two lines. No ideas why. It worked reasonably when executed + * from vi mode, and displayed lines 2, 3, and 4, so we do a default + * command for each separator. + */ +#define SINGLE_CHAR_COMMANDS "\004!#&*<=>@~" + newscreen = 0; + if (ecp->clen != 0 && ecp->cp[0] != '|' && ecp->cp[0] != '\n') { + if (strchr(SINGLE_CHAR_COMMANDS, *ecp->cp)) { + p = ecp->cp; + ++ecp->cp; + --ecp->clen; + namelen = 1; + } else { + for (p = ecp->cp; + ecp->clen > 0; --ecp->clen, ++ecp->cp) + if (!isalpha(*ecp->cp)) + break; + if ((namelen = ecp->cp - p) == 0) { + msgq(sp, M_ERR, "080|Unknown command name"); + goto err; + } + } + + /* + * !!! + * Historic vi permitted flags to immediately follow any + * subset of the 'delete' command, but then did not permit + * further arguments (flag, buffer, count). Make it work. + * Permit further arguments for the few shreds of dignity + * it offers. + * + * Adding commands that start with 'd', and match "delete" + * up to a l, p, +, - or # character can break this code. + * + * !!! + * Capital letters beginning the command names ex, edit, + * next, previous, tag and visual (in vi mode) indicate the + * command should happen in a new screen. + */ + switch (p[0]) { + case 'd': + for (s = p, + t = cmds[C_DELETE].name; *s == *t; ++s, ++t); + if (s[0] == 'l' || s[0] == 'p' || s[0] == '+' || + s[0] == '-' || s[0] == '^' || s[0] == '#') { + len = (ecp->cp - p) - (s - p); + ecp->cp -= len; + ecp->clen += len; + ecp->rcmd = cmds[C_DELETE]; + ecp->rcmd.syntax = "1bca1"; + ecp->cmd = &ecp->rcmd; + goto skip_srch; + } + break; + case 'E': case 'F': case 'N': case 'P': case 'T': case 'V': + newscreen = 1; + p[0] = tolower(p[0]); + break; + } + + /* + * Search the table for the command. + * + * !!! + * Historic vi permitted the mark to immediately follow the + * 'k' in the 'k' command. Make it work. + * + * !!! + * Historic vi permitted any flag to follow the s command, e.g. + * "s/e/E/|s|sgc3p" was legal. Make the command "sgc" work. + * Since the following characters all have to be flags, i.e. + * alphabetics, we can let the s command routine return errors + * if it was some illegal command string. This code will break + * if an "sg" or similar command is ever added. The substitute + * code doesn't care if it's a "cgr" flag or a "#lp" flag that + * follows the 's', but we limit the choices here to "cgr" so + * that we get unknown command messages for wrong combinations. + */ + if ((ecp->cmd = ex_comm_search(p, namelen)) == NULL) + switch (p[0]) { + case 'k': + if (namelen == 2) { + ecp->cp -= namelen - 1; + ecp->clen += namelen - 1; + ecp->cmd = &cmds[C_K]; + break; + } + goto unknown; + case 's': + for (s = p + 1, cnt = namelen; --cnt; ++s) + if (s[0] != 'c' && + s[0] != 'g' && s[0] != 'r') + break; + if (cnt == 0) { + ecp->cp -= namelen - 1; + ecp->clen += namelen - 1; + ecp->rcmd = cmds[C_SUBSTITUTE]; + ecp->rcmd.fn = ex_subagain; + ecp->cmd = &ecp->rcmd; + break; + } + /* FALLTHROUGH */ + default: +unknown: if (newscreen) + p[0] = toupper(p[0]); + ex_unknown(sp, p, namelen); + goto err; + } + + /* + * The visual command has a different syntax when called + * from ex than when called from a vi colon command. FMH. + * Make the change now, before we test for the newscreen + * semantic, so that we're testing the right one. + */ +skip_srch: if (ecp->cmd == &cmds[C_VISUAL_EX] && F_ISSET(sp, SC_VI)) + ecp->cmd = &cmds[C_VISUAL_VI]; + + /* + * !!! + * Historic vi permitted a capital 'P' at the beginning of + * any command that started with 'p'. Probably wanted the + * P[rint] command for backward compatibility, and the code + * just made Preserve and Put work by accident. Nvi uses + * Previous to mean previous-in-a-new-screen, so be careful. + */ + if (newscreen && !F_ISSET(ecp->cmd, E_NEWSCREEN) && + (ecp->cmd == &cmds[C_PRINT] || + ecp->cmd == &cmds[C_PRESERVE])) + newscreen = 0; + + /* Test for a newscreen associated with this command. */ + if (newscreen && !F_ISSET(ecp->cmd, E_NEWSCREEN)) + goto unknown; + + /* Secure means no shell access. */ + if (F_ISSET(ecp->cmd, E_SECURE) && O_ISSET(sp, O_SECURE)) { + ex_emsg(sp, ecp->cmd->name, EXM_SECURE); + goto err; + } + + /* + * Multiple < and > characters; another "feature". Note, + * The string passed to the underlying function may not be + * nul terminated in this case. + */ + if ((ecp->cmd == &cmds[C_SHIFTL] && *p == '<') || + (ecp->cmd == &cmds[C_SHIFTR] && *p == '>')) { + for (ch = *p; + ecp->clen > 0; --ecp->clen, ++ecp->cp) + if (*ecp->cp != ch) + break; + if (argv_exp0(sp, ecp, p, ecp->cp - p)) + goto err; + } + + /* Set the format style flags for the next command. */ + if (ecp->cmd == &cmds[C_HASH]) + exp->fdef = E_C_HASH; + else if (ecp->cmd == &cmds[C_LIST]) + exp->fdef = E_C_LIST; + else if (ecp->cmd == &cmds[C_PRINT]) + exp->fdef = E_C_PRINT; + F_CLR(ecp, E_USELASTCMD); + } else { + /* Print is the default command. */ + ecp->cmd = &cmds[C_PRINT]; + + /* Set the saved format flags. */ + F_SET(ecp, exp->fdef); + + /* + * !!! + * If no address was specified, and it's not a global command, + * we up the address by one. (I have no idea why globals are + * exempted, but it's (ahem) historic practice.) + */ + if (ecp->addrcnt == 0 && !F_ISSET(sp, SC_EX_GLOBAL)) { + ecp->addrcnt = 1; + ecp->addr1.lno = sp->lno + 1; + ecp->addr1.cno = sp->cno; + } + + F_SET(ecp, E_USELASTCMD); + } + + /* + * !!! + * Historically, the number option applied to both ex and vi. One + * strangeness was that ex didn't switch display formats until a + * command was entered, e.g. <CR>'s after the set didn't change to + * the new format, but :1p would. + */ + if (O_ISSET(sp, O_NUMBER)) { + F_SET(ecp, E_OPTNUM); + FL_SET(ecp->iflags, E_C_HASH); + } else + F_CLR(ecp, E_OPTNUM); + + /* Check for ex mode legality. */ + if (F_ISSET(sp, SC_EX) && (F_ISSET(ecp->cmd, E_VIONLY) || newscreen)) { + msgq(sp, M_ERR, + "082|%s: command not available in ex mode", ecp->cmd->name); + goto err; + } + + /* Add standard command flags. */ + F_SET(ecp, ecp->cmd->flags); + if (!newscreen) + F_CLR(ecp, E_NEWSCREEN); + + /* + * There are three normal termination cases for an ex command. They + * are the end of the string (ecp->clen), or unescaped (by <literal + * next> characters) <newline> or '|' characters. As we're now past + * possible addresses, we can determine how long the command is, so we + * don't have to look for all the possible terminations. Naturally, + * there are some exciting special cases: + * + * 1: The bang, global, v and the filter versions of the read and + * write commands are delimited by <newline>s (they can contain + * shell pipes). + * 2: The ex, edit, next and visual in vi mode commands all take ex + * commands as their first arguments. + * 3: The s command takes an RE as its first argument, and wants it + * to be specially delimited. + * + * Historically, '|' characters in the first argument of the ex, edit, + * next, vi visual, and s commands didn't delimit the command. And, + * in the filter cases for read and write, and the bang, global and v + * commands, they did not delimit the command at all. + * + * For example, the following commands were legal: + * + * :edit +25|s/abc/ABC/ file.c + * :s/|/PIPE/ + * :read !spell % | columnate + * :global/pattern/p|l + * + * It's not quite as simple as it sounds, however. The command: + * + * :s/a/b/|s/c/d|set + * + * was also legal, i.e. the historic ex parser (using the word loosely, + * since "parser" implies some regularity of syntax) delimited the RE's + * based on its delimiter and not anything so irretrievably vulgar as a + * command syntax. + * + * Anyhow, the following code makes this all work. First, for the + * special cases we move past their special argument(s). Then, we + * do normal command processing on whatever is left. Barf-O-Rama. + */ + discard = 0; /* Characters discarded from the command. */ + arg1_len = 0; + ecp->save_cmd = ecp->cp; + if (ecp->cmd == &cmds[C_EDIT] || ecp->cmd == &cmds[C_EX] || + ecp->cmd == &cmds[C_NEXT] || ecp->cmd == &cmds[C_VISUAL_VI]) { + /* + * Move to the next non-whitespace character. A '!' + * immediately following the command is eaten as a + * force flag. + */ + if (ecp->clen > 0 && *ecp->cp == '!') { + ++ecp->cp; + --ecp->clen; + FL_SET(ecp->iflags, E_C_FORCE); + + /* Reset, don't reparse. */ + ecp->save_cmd = ecp->cp; + } + for (; ecp->clen > 0; --ecp->clen, ++ecp->cp) + if (!isblank(*ecp->cp)) + break; + /* + * QUOTING NOTE: + * + * The historic implementation ignored all escape characters + * so there was no way to put a space or newline into the +cmd + * field. We do a simplistic job of fixing it by moving to the + * first whitespace character that isn't escaped. The escaping + * characters are stripped as no longer useful. + */ + if (ecp->clen > 0 && *ecp->cp == '+') { + ++ecp->cp; + --ecp->clen; + for (arg1 = p = ecp->cp; + ecp->clen > 0; --ecp->clen, ++ecp->cp) { + ch = *ecp->cp; + if (IS_ESCAPE(sp, ecp, ch) && + ecp->clen > 1) { + ++discard; + --ecp->clen; + ch = *++ecp->cp; + } else if (isblank(ch)) + break; + *p++ = ch; + } + arg1_len = ecp->cp - arg1; + + /* Reset, so the first argument isn't reparsed. */ + ecp->save_cmd = ecp->cp; + } + } else if (ecp->cmd == &cmds[C_BANG] || + ecp->cmd == &cmds[C_GLOBAL] || ecp->cmd == &cmds[C_V]) { + /* + * QUOTING NOTE: + * + * We use backslashes to escape <newline> characters, although + * this wasn't historic practice for the bang command. It was + * for the global and v commands, and it's common usage when + * doing text insert during the command. Escaping characters + * are stripped as no longer useful. + */ + for (p = ecp->cp; ecp->clen > 0; --ecp->clen, ++ecp->cp) { + ch = *ecp->cp; + if (ch == '\\' && ecp->clen > 1 && ecp->cp[1] == '\n') { + ++discard; + --ecp->clen; + ch = *++ecp->cp; + + ++gp->if_lno; + ++ecp->if_lno; + } else if (ch == '\n') + break; + *p++ = ch; + } + } else if (ecp->cmd == &cmds[C_READ] || ecp->cmd == &cmds[C_WRITE]) { + /* + * For write commands, if the next character is a <blank>, and + * the next non-blank character is a '!', it's a filter command + * and we want to eat everything up to the <newline>. For read + * commands, if the next non-blank character is a '!', it's a + * filter command and we want to eat everything up to the next + * <newline>. Otherwise, we're done. + */ + for (tmp = 0; ecp->clen > 0; --ecp->clen, ++ecp->cp) { + ch = *ecp->cp; + if (isblank(ch)) + tmp = 1; + else + break; + } + if (ecp->clen > 0 && ch == '!' && + (ecp->cmd == &cmds[C_READ] || tmp)) + for (; ecp->clen > 0; --ecp->clen, ++ecp->cp) + if (ecp->cp[0] == '\n') + break; + } else if (ecp->cmd == &cmds[C_SUBSTITUTE]) { + /* + * Move to the next non-whitespace character, we'll use it as + * the delimiter. If the character isn't an alphanumeric or + * a '|', it's the delimiter, so parse it. Otherwise, we're + * into something like ":s g", so use the special s command. + */ + for (; ecp->clen > 0; --ecp->clen, ++ecp->cp) + if (!isblank(ecp->cp[0])) + break; + + if (isalnum(ecp->cp[0]) || ecp->cp[0] == '|') { + ecp->rcmd = cmds[C_SUBSTITUTE]; + ecp->rcmd.fn = ex_subagain; + ecp->cmd = &ecp->rcmd; + } else if (ecp->clen > 0) { + /* + * QUOTING NOTE: + * + * Backslashes quote delimiter characters for RE's. + * The backslashes are NOT removed since they'll be + * used by the RE code. Move to the third delimiter + * that's not escaped (or the end of the command). + */ + delim = *ecp->cp; + ++ecp->cp; + --ecp->clen; + for (cnt = 2; ecp->clen > 0 && + cnt != 0; --ecp->clen, ++ecp->cp) + if (ecp->cp[0] == '\\' && + ecp->clen > 1) { + ++ecp->cp; + --ecp->clen; + } else if (ecp->cp[0] == delim) + --cnt; + } + } + + /* + * Use normal quoting and termination rules to find the end of this + * command. + * + * QUOTING NOTE: + * + * Historically, vi permitted ^V's to escape <newline>'s in the .exrc + * file. It was almost certainly a bug, but that's what bug-for-bug + * compatibility means, Grasshopper. Also, ^V's escape the command + * delimiters. Literal next quote characters in front of the newlines, + * '|' characters or literal next characters are stripped as they're + * no longer useful. + */ + vi_address = ecp->clen != 0 && ecp->cp[0] != '\n'; + for (p = ecp->cp; ecp->clen > 0; --ecp->clen, ++ecp->cp) { + ch = ecp->cp[0]; + if (IS_ESCAPE(sp, ecp, ch) && ecp->clen > 1) { + tmp = ecp->cp[1]; + if (tmp == '\n' || tmp == '|') { + if (tmp == '\n') { + ++gp->if_lno; + ++ecp->if_lno; + } + ++discard; + --ecp->clen; + ++ecp->cp; + ch = tmp; + } + } else if (ch == '\n' || ch == '|') { + if (ch == '\n') + F_SET(ecp, E_NEWLINE); + --ecp->clen; + break; + } + *p++ = ch; + } + + /* + * Save off the next command information, go back to the + * original start of the command. + */ + p = ecp->cp + 1; + ecp->cp = ecp->save_cmd; + ecp->save_cmd = p; + ecp->save_cmdlen = ecp->clen; + ecp->clen = ((ecp->save_cmd - ecp->cp) - 1) - discard; + + /* + * QUOTING NOTE: + * + * The "set tags" command historically used a backslash, not the + * user's literal next character, to escape whitespace. Handle + * it here instead of complicating the argv_exp3() code. Note, + * this isn't a particularly complex trap, and if backslashes were + * legal in set commands, this would have to be much more complicated. + */ + if (ecp->cmd == &cmds[C_SET]) + for (p = ecp->cp, len = ecp->clen; len > 0; --len, ++p) + if (*p == '\\') + *p = CH_LITERAL; + + /* + * Set the default addresses. It's an error to specify an address for + * a command that doesn't take them. If two addresses are specified + * for a command that only takes one, lose the first one. Two special + * cases here, some commands take 0 or 2 addresses. For most of them + * (the E_ADDR2_ALL flag), 0 defaults to the entire file. For one + * (the `!' command, the E_ADDR2_NONE flag), 0 defaults to no lines. + * + * Also, if the file is empty, some commands want to use an address of + * 0, i.e. the entire file is 0 to 0, and the default first address is + * 0. Otherwise, an entire file is 1 to N and the default line is 1. + * Note, we also add the E_ADDR_ZERO flag to the command flags, for the + * case where the 0 address is only valid if it's a default address. + * + * Also, set a flag if we set the default addresses. Some commands + * (ex: z) care if the user specified an address or if we just used + * the current cursor. + */ + switch (F_ISSET(ecp, E_ADDR1 | E_ADDR2 | E_ADDR2_ALL | E_ADDR2_NONE)) { + case E_ADDR1: /* One address: */ + switch (ecp->addrcnt) { + case 0: /* Default cursor/empty file. */ + ecp->addrcnt = 1; + F_SET(ecp, E_ADDR_DEF); + if (F_ISSET(ecp, E_ADDR_ZERODEF)) { + if (db_last(sp, &lno)) + goto err; + if (lno == 0) { + ecp->addr1.lno = 0; + F_SET(ecp, E_ADDR_ZERO); + } else + ecp->addr1.lno = sp->lno; + } else + ecp->addr1.lno = sp->lno; + ecp->addr1.cno = sp->cno; + break; + case 1: + break; + case 2: /* Lose the first address. */ + ecp->addrcnt = 1; + ecp->addr1 = ecp->addr2; + } + break; + case E_ADDR2_NONE: /* Zero/two addresses: */ + if (ecp->addrcnt == 0) /* Default to nothing. */ + break; + goto two_addr; + case E_ADDR2_ALL: /* Zero/two addresses: */ + if (ecp->addrcnt == 0) { /* Default entire/empty file. */ + F_SET(ecp, E_ADDR_DEF); + ecp->addrcnt = 2; + if (sp->ep == NULL) + ecp->addr2.lno = 0; + else if (db_last(sp, &ecp->addr2.lno)) + goto err; + if (F_ISSET(ecp, E_ADDR_ZERODEF) && + ecp->addr2.lno == 0) { + ecp->addr1.lno = 0; + F_SET(ecp, E_ADDR_ZERO); + } else + ecp->addr1.lno = 1; + ecp->addr1.cno = ecp->addr2.cno = 0; + F_SET(ecp, E_ADDR2_ALL); + break; + } + /* FALLTHROUGH */ + case E_ADDR2: /* Two addresses: */ +two_addr: switch (ecp->addrcnt) { + case 0: /* Default cursor/empty file. */ + ecp->addrcnt = 2; + F_SET(ecp, E_ADDR_DEF); + if (sp->lno == 1 && + F_ISSET(ecp, E_ADDR_ZERODEF)) { + if (db_last(sp, &lno)) + goto err; + if (lno == 0) { + ecp->addr1.lno = ecp->addr2.lno = 0; + F_SET(ecp, E_ADDR_ZERO); + } else + ecp->addr1.lno = + ecp->addr2.lno = sp->lno; + } else + ecp->addr1.lno = ecp->addr2.lno = sp->lno; + ecp->addr1.cno = ecp->addr2.cno = sp->cno; + break; + case 1: /* Default to first address. */ + ecp->addrcnt = 2; + ecp->addr2 = ecp->addr1; + break; + case 2: + break; + } + break; + default: + if (ecp->addrcnt) /* Error. */ + goto usage; + } + + /* + * !!! + * The ^D scroll command historically scrolled the value of the scroll + * option or to EOF. It was an error if the cursor was already at EOF. + * (Leading addresses were permitted, but were then ignored.) + */ + if (ecp->cmd == &cmds[C_SCROLL]) { + ecp->addrcnt = 2; + ecp->addr1.lno = sp->lno + 1; + ecp->addr2.lno = sp->lno + O_VAL(sp, O_SCROLL); + ecp->addr1.cno = ecp->addr2.cno = sp->cno; + if (db_last(sp, &lno)) + goto err; + if (lno != 0 && lno > sp->lno && ecp->addr2.lno > lno) + ecp->addr2.lno = lno; + } + + ecp->flagoff = 0; + for (p = ecp->cmd->syntax; *p != '\0'; ++p) { + /* + * The force flag is sensitive to leading whitespace, i.e. + * "next !" is different from "next!". Handle it before + * skipping leading <blank>s. + */ + if (*p == '!') { + if (ecp->clen > 0 && *ecp->cp == '!') { + ++ecp->cp; + --ecp->clen; + FL_SET(ecp->iflags, E_C_FORCE); + } + continue; + } + + /* Skip leading <blank>s. */ + for (; ecp->clen > 0; --ecp->clen, ++ecp->cp) + if (!isblank(*ecp->cp)) + break; + if (ecp->clen == 0) + break; + + switch (*p) { + case '1': /* +, -, #, l, p */ + /* + * !!! + * Historically, some flags were ignored depending + * on where they occurred in the command line. For + * example, in the command, ":3+++p--#", historic vi + * acted on the '#' flag, but ignored the '-' flags. + * It's unambiguous what the flags mean, so we just + * handle them regardless of the stupidity of their + * location. + */ + for (; ecp->clen; --ecp->clen, ++ecp->cp) + switch (*ecp->cp) { + case '+': + ++ecp->flagoff; + break; + case '-': + case '^': + --ecp->flagoff; + break; + case '#': + F_CLR(ecp, E_OPTNUM); + FL_SET(ecp->iflags, E_C_HASH); + exp->fdef |= E_C_HASH; + break; + case 'l': + FL_SET(ecp->iflags, E_C_LIST); + exp->fdef |= E_C_LIST; + break; + case 'p': + FL_SET(ecp->iflags, E_C_PRINT); + exp->fdef |= E_C_PRINT; + break; + default: + goto end_case1; + } +end_case1: break; + case '2': /* -, ., +, ^ */ + case '3': /* -, ., +, ^, = */ + for (; ecp->clen; --ecp->clen, ++ecp->cp) + switch (*ecp->cp) { + case '-': + FL_SET(ecp->iflags, E_C_DASH); + break; + case '.': + FL_SET(ecp->iflags, E_C_DOT); + break; + case '+': + FL_SET(ecp->iflags, E_C_PLUS); + break; + case '^': + FL_SET(ecp->iflags, E_C_CARAT); + break; + case '=': + if (*p == '3') { + FL_SET(ecp->iflags, E_C_EQUAL); + break; + } + /* FALLTHROUGH */ + default: + goto end_case23; + } +end_case23: break; + case 'b': /* buffer */ + /* + * !!! + * Historically, "d #" was a delete with a flag, not a + * delete into the '#' buffer. If the current command + * permits a flag, don't use one as a buffer. However, + * the 'l' and 'p' flags were legal buffer names in the + * historic ex, and were used as buffers, not flags. + */ + if ((ecp->cp[0] == '+' || ecp->cp[0] == '-' || + ecp->cp[0] == '^' || ecp->cp[0] == '#') && + strchr(p, '1') != NULL) + break; + /* + * !!! + * Digits can't be buffer names in ex commands, or the + * command "d2" would be a delete into buffer '2', and + * not a two-line deletion. + */ + if (!isdigit(ecp->cp[0])) { + ecp->buffer = *ecp->cp; + ++ecp->cp; + --ecp->clen; + FL_SET(ecp->iflags, E_C_BUFFER); + } + break; + case 'c': /* count [01+a] */ + ++p; + /* Validate any signed value. */ + if (!isdigit(*ecp->cp) && (*p != '+' || + (*ecp->cp != '+' && *ecp->cp != '-'))) + break; + /* If a signed value, set appropriate flags. */ + if (*ecp->cp == '-') + FL_SET(ecp->iflags, E_C_COUNT_NEG); + else if (*ecp->cp == '+') + FL_SET(ecp->iflags, E_C_COUNT_POS); + if ((nret = + nget_slong(<mp, ecp->cp, &t, 10)) != NUM_OK) { + ex_badaddr(sp, NULL, A_NOTSET, nret); + goto err; + } + if (ltmp == 0 && *p != '0') { + msgq(sp, M_ERR, "083|Count may not be zero"); + goto err; + } + ecp->clen -= (t - ecp->cp); + ecp->cp = t; + + /* + * Counts as address offsets occur in commands taking + * two addresses. Historic vi practice was to use + * the count as an offset from the *second* address. + * + * Set a count flag; some underlying commands (see + * join) do different things with counts than with + * line addresses. + */ + if (*p == 'a') { + ecp->addr1 = ecp->addr2; + ecp->addr2.lno = ecp->addr1.lno + ltmp - 1; + } else + ecp->count = ltmp; + FL_SET(ecp->iflags, E_C_COUNT); + break; + case 'f': /* file */ + if (argv_exp2(sp, ecp, ecp->cp, ecp->clen)) + goto err; + goto arg_cnt_chk; + case 'l': /* line */ + /* + * Get a line specification. + * + * If the line was a search expression, we may have + * changed state during the call, and we're now + * searching the file. Push ourselves onto the state + * stack. + */ + if (ex_line(sp, ecp, &cur, &isaddr, &tmp)) + goto rfail; + if (tmp) + goto err; + + /* Line specifications are always required. */ + if (!isaddr) { + msgq_str(sp, M_ERR, ecp->cp, + "084|%s: bad line specification"); + goto err; + } + /* + * The target line should exist for these commands, + * but 0 is legal for them as well. + */ + if (cur.lno != 0 && !db_exist(sp, cur.lno)) { + ex_badaddr(sp, NULL, A_EOF, NUM_OK); + goto err; + } + ecp->lineno = cur.lno; + break; + case 'S': /* string, file exp. */ + if (ecp->clen != 0) { + if (argv_exp1(sp, ecp, ecp->cp, + ecp->clen, ecp->cmd == &cmds[C_BANG])) + goto err; + goto addr_verify; + } + /* FALLTHROUGH */ + case 's': /* string */ + if (argv_exp0(sp, ecp, ecp->cp, ecp->clen)) + goto err; + goto addr_verify; + case 'W': /* word string */ + /* + * QUOTING NOTE: + * + * Literal next characters escape the following + * character. Quoting characters are stripped here + * since they are no longer useful. + * + * First there was the word. + */ + for (p = t = ecp->cp; + ecp->clen > 0; --ecp->clen, ++ecp->cp) { + ch = *ecp->cp; + if (IS_ESCAPE(sp, + ecp, ch) && ecp->clen > 1) { + --ecp->clen; + *p++ = *++ecp->cp; + } else if (isblank(ch)) { + ++ecp->cp; + --ecp->clen; + break; + } else + *p++ = ch; + } + if (argv_exp0(sp, ecp, t, p - t)) + goto err; + + /* Delete intervening whitespace. */ + for (; ecp->clen > 0; + --ecp->clen, ++ecp->cp) { + ch = *ecp->cp; + if (!isblank(ch)) + break; + } + if (ecp->clen == 0) + goto usage; + + /* Followed by the string. */ + for (p = t = ecp->cp; ecp->clen > 0; + --ecp->clen, ++ecp->cp, ++p) { + ch = *ecp->cp; + if (IS_ESCAPE(sp, + ecp, ch) && ecp->clen > 1) { + --ecp->clen; + *p = *++ecp->cp; + } else + *p = ch; + } + if (argv_exp0(sp, ecp, t, p - t)) + goto err; + goto addr_verify; + case 'w': /* word */ + if (argv_exp3(sp, ecp, ecp->cp, ecp->clen)) + goto err; +arg_cnt_chk: if (*++p != 'N') { /* N */ + /* + * If a number is specified, must either be + * 0 or that number, if optional, and that + * number, if required. + */ + tmp = *p - '0'; + if ((*++p != 'o' || exp->argsoff != 0) && + exp->argsoff != tmp) + goto usage; + } + goto addr_verify; + default: + msgq(sp, M_ERR, + "085|Internal syntax table error (%s: %s)", + ecp->cmd->name, KEY_NAME(sp, *p)); + } + } + + /* Skip trailing whitespace. */ + for (; ecp->clen > 0; --ecp->clen) { + ch = *ecp->cp++; + if (!isblank(ch)) + break; + } + + /* + * There shouldn't be anything left, and no more required fields, + * i.e neither 'l' or 'r' in the syntax string. + */ + if (ecp->clen != 0 || strpbrk(p, "lr")) { +usage: msgq(sp, M_ERR, "086|Usage: %s", ecp->cmd->usage); + goto err; + } + + /* + * Verify that the addresses are legal. Check the addresses here, + * because this is a place where all ex addresses pass through. + * (They don't all pass through ex_line(), for instance.) We're + * assuming that any non-existent line doesn't exist because it's + * past the end-of-file. That's a pretty good guess. + * + * If it's a "default vi command", an address of zero is okay. + */ +addr_verify: + switch (ecp->addrcnt) { + case 2: + /* + * Historic ex/vi permitted commands with counts to go past + * EOF. So, for example, if the file only had 5 lines, the + * ex command "1,6>" would fail, but the command ">300" + * would succeed. Since we don't want to have to make all + * of the underlying commands handle random line numbers, + * fix it here. + */ + if (ecp->addr2.lno == 0) { + if (!F_ISSET(ecp, E_ADDR_ZERO) && + (F_ISSET(sp, SC_EX) || + !F_ISSET(ecp, E_USELASTCMD))) { + ex_badaddr(sp, ecp->cmd, A_ZERO, NUM_OK); + goto err; + } + } else if (!db_exist(sp, ecp->addr2.lno)) + if (FL_ISSET(ecp->iflags, E_C_COUNT)) { + if (db_last(sp, &lno)) + goto err; + ecp->addr2.lno = lno; + } else { + ex_badaddr(sp, NULL, A_EOF, NUM_OK); + goto err; + } + /* FALLTHROUGH */ + case 1: + if (ecp->addr1.lno == 0) { + if (!F_ISSET(ecp, E_ADDR_ZERO) && + (F_ISSET(sp, SC_EX) || + !F_ISSET(ecp, E_USELASTCMD))) { + ex_badaddr(sp, ecp->cmd, A_ZERO, NUM_OK); + goto err; + } + } else if (!db_exist(sp, ecp->addr1.lno)) { + ex_badaddr(sp, NULL, A_EOF, NUM_OK); + goto err; + } + break; + } + + /* + * If doing a default command and there's nothing left on the line, + * vi just moves to the line. For example, ":3" and ":'a,'b" just + * move to line 3 and line 'b, respectively, but ":3|" prints line 3. + * + * !!! + * In addition, IF THE LINE CHANGES, move to the first nonblank of + * the line. + * + * !!! + * This is done before the absolute mark gets set; historically, + * "/a/,/b/" did NOT set vi's absolute mark, but "/a/,/b/d" did. + */ + if ((F_ISSET(sp, SC_VI) || F_ISSET(ecp, E_NOPRDEF)) && + F_ISSET(ecp, E_USELASTCMD) && vi_address == 0) { + switch (ecp->addrcnt) { + case 2: + if (sp->lno != + (ecp->addr2.lno ? ecp->addr2.lno : 1)) { + sp->lno = + ecp->addr2.lno ? ecp->addr2.lno : 1; + sp->cno = 0; + (void)nonblank(sp, sp->lno, &sp->cno); + } + break; + case 1: + if (sp->lno != + (ecp->addr1.lno ? ecp->addr1.lno : 1)) { + sp->lno = + ecp->addr1.lno ? ecp->addr1.lno : 1; + sp->cno = 0; + (void)nonblank(sp, sp->lno, &sp->cno); + } + break; + } + ecp->cp = ecp->save_cmd; + ecp->clen = ecp->save_cmdlen; + goto loop; + } + + /* + * Set the absolute mark -- we have to set it for vi here, in case + * it's a compound command, e.g. ":5p|6" should set the absolute + * mark for vi. + */ + if (F_ISSET(ecp, E_ABSMARK)) { + cur.lno = sp->lno; + cur.cno = sp->cno; + F_CLR(ecp, E_ABSMARK); + if (mark_set(sp, ABSMARK1, &cur, 1)) + goto err; + } + +#if defined(DEBUG) && defined(COMLOG) + ex_comlog(sp, ecp); +#endif + /* Increment the command count if not called from vi. */ + if (F_ISSET(sp, SC_EX)) + ++sp->ccnt; + + /* + * If file state available, and not doing a global command, + * log the start of an action. + */ + if (sp->ep != NULL && !F_ISSET(sp, SC_EX_GLOBAL)) + (void)log_cursor(sp); + + /* + * !!! + * There are two special commands for the purposes of this code: the + * default command (<carriage-return>) or the scrolling commands (^D + * and <EOF>) as the first non-<blank> characters in the line. + * + * If this is the first command in the command line, we received the + * command from the ex command loop and we're talking to a tty, and + * and there's nothing else on the command line, and it's one of the + * special commands, we move back up to the previous line, and erase + * the prompt character with the output. Since ex runs in canonical + * mode, we don't have to do anything else, a <newline> has already + * been echoed by the tty driver. It's OK if vi calls us -- we won't + * be in ex mode so we'll do nothing. + */ + if (F_ISSET(ecp, E_NRSEP)) { + if (sp->ep != NULL && + F_ISSET(sp, SC_EX) && !F_ISSET(gp, G_SCRIPTED) && + (F_ISSET(ecp, E_USELASTCMD) || ecp->cmd == &cmds[C_SCROLL])) + gp->scr_ex_adjust(sp, EX_TERM_SCROLL); + F_CLR(ecp, E_NRSEP); + } + + /* + * Call the underlying function for the ex command. + * + * XXX + * Interrupts behave like errors, for now. + */ + if (ecp->cmd->fn(sp, ecp) || INTERRUPTED(sp)) { + if (F_ISSET(gp, G_SCRIPTED)) + F_SET(sp, SC_EXIT_FORCE); + goto err; + } + +#ifdef DEBUG + /* Make sure no function left global temporary space locked. */ + if (F_ISSET(gp, G_TMP_INUSE)) { + F_CLR(gp, G_TMP_INUSE); + msgq(sp, M_ERR, "087|%s: temporary buffer not released", + ecp->cmd->name); + } +#endif + /* + * Ex displayed the number of lines modified immediately after each + * command, so the command "1,10d|1,10d" would display: + * + * 10 lines deleted + * 10 lines deleted + * <autoprint line> + * + * Executing ex commands from vi only reported the final modified + * lines message -- that's wrong enough that we don't match it. + */ + if (F_ISSET(sp, SC_EX)) + mod_rpt(sp); + + /* + * Integrate any offset parsed by the underlying command, and make + * sure the referenced line exists. + * + * XXX + * May not match historic practice (which I've never been able to + * completely figure out.) For example, the '=' command from vi + * mode often got the offset wrong, and complained it was too large, + * but didn't seem to have a problem with the cursor. If anyone + * complains, ask them how it's supposed to work, they might know. + */ + if (sp->ep != NULL && ecp->flagoff) { + if (ecp->flagoff < 0) { + if (sp->lno <= -ecp->flagoff) { + msgq(sp, M_ERR, + "088|Flag offset to before line 1"); + goto err; + } + } else { + if (!NPFITS(MAX_REC_NUMBER, sp->lno, ecp->flagoff)) { + ex_badaddr(sp, NULL, A_NOTSET, NUM_OVER); + goto err; + } + if (!db_exist(sp, sp->lno + ecp->flagoff)) { + msgq(sp, M_ERR, + "089|Flag offset past end-of-file"); + goto err; + } + } + sp->lno += ecp->flagoff; + } + + /* + * If the command executed successfully, we may want to display a line + * based on the autoprint option or an explicit print flag. (Make sure + * that there's a line to display.) Also, the autoprint edit option is + * turned off for the duration of global commands. + */ + if (F_ISSET(sp, SC_EX) && sp->ep != NULL && sp->lno != 0) { + /* + * The print commands have already handled the `print' flags. + * If so, clear them. + */ + if (FL_ISSET(ecp->iflags, E_CLRFLAG)) + FL_CLR(ecp->iflags, E_C_HASH | E_C_LIST | E_C_PRINT); + + /* If hash set only because of the number option, discard it. */ + if (F_ISSET(ecp, E_OPTNUM)) + FL_CLR(ecp->iflags, E_C_HASH); + + /* + * If there was an explicit flag to display the new cursor line, + * or autoprint is set and a change was made, display the line. + * If any print flags were set use them, else default to print. + */ + LF_INIT(FL_ISSET(ecp->iflags, E_C_HASH | E_C_LIST | E_C_PRINT)); + if (!LF_ISSET(E_C_HASH | E_C_LIST | E_C_PRINT | E_NOAUTO) && + !F_ISSET(sp, SC_EX_GLOBAL) && + O_ISSET(sp, O_AUTOPRINT) && F_ISSET(ecp, E_AUTOPRINT)) + LF_INIT(E_C_PRINT); + + if (LF_ISSET(E_C_HASH | E_C_LIST | E_C_PRINT)) { + cur.lno = sp->lno; + cur.cno = 0; + (void)ex_print(sp, ecp, &cur, &cur, flags); + } + } + + /* + * If the command had an associated "+cmd", it has to be executed + * before we finish executing any more of this ex command. For + * example, consider a .exrc file that contains the following lines: + * + * :set all + * :edit +25 file.c|s/abc/ABC/|1 + * :3,5 print + * + * This can happen more than once -- the historic vi simply hung or + * dropped core, of course. Prepend the + command back into the + * current command and continue. We may have to add an additional + * <literal next> character. We know that it will fit because we + * discarded at least one space and the + character. + */ + if (arg1_len != 0) { + /* + * If the last character of the + command was a <literal next> + * character, it would be treated differently because of the + * append. Quote it, if necessary. + */ + if (IS_ESCAPE(sp, ecp, arg1[arg1_len - 1])) { + *--ecp->save_cmd = CH_LITERAL; + ++ecp->save_cmdlen; + } + + ecp->save_cmd -= arg1_len; + ecp->save_cmdlen += arg1_len; + memcpy(ecp->save_cmd, arg1, arg1_len); + + /* + * Any commands executed from a +cmd are executed starting at + * the first column of the last line of the file -- NOT the + * first nonblank.) The main file startup code doesn't know + * that a +cmd was set, however, so it may have put us at the + * top of the file. (Note, this is safe because we must have + * switched files to get here.) + */ + F_SET(ecp, E_MOVETOEND); + } + + /* Update the current command. */ + ecp->cp = ecp->save_cmd; + ecp->clen = ecp->save_cmdlen; + + /* + * !!! + * If we've changed screens or underlying files, any pending global or + * v command, or @ buffer that has associated addresses, has to be + * discarded. This is historic practice for globals, and necessary for + * @ buffers that had associated addresses. + * + * Otherwise, if we've changed underlying files, it's not a problem, + * we continue with the rest of the ex command(s), operating on the + * new file. However, if we switch screens (either by exiting or by + * an explicit command), we have no way of knowing where to put output + * messages, and, since we don't control screens here, we could screw + * up the upper layers, (e.g. we could exit/reenter a screen multiple + * times). So, return and continue after we've got a new screen. + */ + if (F_ISSET(sp, SC_EXIT | SC_EXIT_FORCE | SC_FSWITCH | SC_SSWITCH)) { + at_found = gv_found = 0; + for (ecp = sp->gp->ecq.lh_first; + ecp != NULL; ecp = ecp->q.le_next) + switch (ecp->agv_flags) { + case 0: + case AGV_AT_NORANGE: + break; + case AGV_AT: + if (!at_found) { + at_found = 1; + msgq(sp, M_ERR, + "090|@ with range running when the file/screen changed"); + } + break; + case AGV_GLOBAL: + case AGV_V: + if (!gv_found) { + gv_found = 1; + msgq(sp, M_ERR, + "091|Global/v command running when the file/screen changed"); + } + break; + default: + abort(); + } + if (at_found || gv_found) + goto discard; + if (F_ISSET(sp, SC_EXIT | SC_EXIT_FORCE | SC_SSWITCH)) + goto rsuccess; + } + + goto loop; + /* NOTREACHED */ + +err: /* + * On command failure, we discard keys and pending commands remaining, + * as well as any keys that were mapped and waiting. The save_cmdlen + * test is not necessarily correct. If we fail early enough we don't + * know if the entire string was a single command or not. Guess, as + * it's useful to know if commands other than the current one are being + * discarded. + */ + if (ecp->save_cmdlen == 0) + for (; ecp->clen; --ecp->clen) { + ch = *ecp->cp++; + if (IS_ESCAPE(sp, ecp, ch) && ecp->clen > 1) { + --ecp->clen; + ++ecp->cp; + } else if (ch == '\n' || ch == '|') { + if (ecp->clen > 1) + ecp->save_cmdlen = 1; + break; + } + } + if (ecp->save_cmdlen != 0 || gp->ecq.lh_first != &gp->excmd) { +discard: msgq(sp, M_BERR, + "092|Ex command failed: pending commands discarded"); + ex_discard(sp); + } + if (v_event_flush(sp, CH_MAPPED)) + msgq(sp, M_BERR, + "093|Ex command failed: mapped keys discarded"); + +rfail: tmp = 1; + if (0) +rsuccess: tmp = 0; + + /* Turn off any file name error information. */ + gp->if_name = NULL; + + /* Turn off the global bit. */ + F_CLR(sp, SC_EX_GLOBAL); + + return (tmp); +} + +/* + * ex_range -- + * Get a line range for ex commands, or perform a vi ex address search. + * + * PUBLIC: int ex_range __P((SCR *, EXCMD *, int *)); + */ +int +ex_range(sp, ecp, errp) + SCR *sp; + EXCMD *ecp; + int *errp; +{ + enum { ADDR_FOUND, ADDR_NEED, ADDR_NONE } addr; + GS *gp; + EX_PRIVATE *exp; + MARK m; + int isaddr; + + *errp = 0; + + /* + * Parse comma or semi-colon delimited line specs. + * + * Semi-colon delimiters update the current address to be the last + * address. For example, the command + * + * :3;/pattern/ecp->cp + * + * will search for pattern from line 3. In addition, if ecp->cp + * is not a valid command, the current line will be left at 3, not + * at the original address. + * + * Extra addresses are discarded, starting with the first. + * + * !!! + * If any addresses are missing, they default to the current line. + * This was historically true for both leading and trailing comma + * delimited addresses as well as for trailing semicolon delimited + * addresses. For consistency, we make it true for leading semicolon + * addresses as well. + */ + gp = sp->gp; + exp = EXP(sp); + for (addr = ADDR_NONE, ecp->addrcnt = 0; ecp->clen > 0;) + switch (*ecp->cp) { + case '%': /* Entire file. */ + /* Vi ex address searches didn't permit % signs. */ + if (F_ISSET(ecp, E_VISEARCH)) + goto ret; + + /* It's an error if the file is empty. */ + if (sp->ep == NULL) { + ex_badaddr(sp, NULL, A_EMPTY, NUM_OK); + *errp = 1; + return (0); + } + /* + * !!! + * A percent character addresses all of the lines in + * the file. Historically, it couldn't be followed by + * any other address. We do it as a text substitution + * for simplicity. POSIX 1003.2 is expected to follow + * this practice. + * + * If it's an empty file, the first line is 0, not 1. + */ + if (addr == ADDR_FOUND) { + ex_badaddr(sp, NULL, A_COMBO, NUM_OK); + *errp = 1; + return (0); + } + if (db_last(sp, &ecp->addr2.lno)) + return (1); + ecp->addr1.lno = ecp->addr2.lno == 0 ? 0 : 1; + ecp->addr1.cno = ecp->addr2.cno = 0; + ecp->addrcnt = 2; + addr = ADDR_FOUND; + ++ecp->cp; + --ecp->clen; + break; + case ',': /* Comma delimiter. */ + /* Vi ex address searches didn't permit commas. */ + if (F_ISSET(ecp, E_VISEARCH)) + goto ret; + /* FALLTHROUGH */ + case ';': /* Semi-colon delimiter. */ + if (sp->ep == NULL) { + ex_badaddr(sp, NULL, A_EMPTY, NUM_OK); + *errp = 1; + return (0); + } + if (addr != ADDR_FOUND) + switch (ecp->addrcnt) { + case 0: + ecp->addr1.lno = sp->lno; + ecp->addr1.cno = sp->cno; + ecp->addrcnt = 1; + break; + case 2: + ecp->addr1 = ecp->addr2; + /* FALLTHROUGH */ + case 1: + ecp->addr2.lno = sp->lno; + ecp->addr2.cno = sp->cno; + ecp->addrcnt = 2; + break; + } + if (*ecp->cp == ';') + switch (ecp->addrcnt) { + case 0: + abort(); + /* NOTREACHED */ + case 1: + sp->lno = ecp->addr1.lno; + sp->cno = ecp->addr1.cno; + break; + case 2: + sp->lno = ecp->addr2.lno; + sp->cno = ecp->addr2.cno; + break; + } + addr = ADDR_NEED; + /* FALLTHROUGH */ + case ' ': /* Whitespace. */ + case '\t': /* Whitespace. */ + ++ecp->cp; + --ecp->clen; + break; + default: + /* Get a line specification. */ + if (ex_line(sp, ecp, &m, &isaddr, errp)) + return (1); + if (*errp) + return (0); + if (!isaddr) + goto ret; + if (addr == ADDR_FOUND) { + ex_badaddr(sp, NULL, A_COMBO, NUM_OK); + *errp = 1; + return (0); + } + switch (ecp->addrcnt) { + case 0: + ecp->addr1 = m; + ecp->addrcnt = 1; + break; + case 1: + ecp->addr2 = m; + ecp->addrcnt = 2; + break; + case 2: + ecp->addr1 = ecp->addr2; + ecp->addr2 = m; + break; + } + addr = ADDR_FOUND; + break; + } + + /* + * !!! + * Vi ex address searches are indifferent to order or trailing + * semi-colons. + */ +ret: if (F_ISSET(ecp, E_VISEARCH)) + return (0); + + if (addr == ADDR_NEED) + switch (ecp->addrcnt) { + case 0: + ecp->addr1.lno = sp->lno; + ecp->addr1.cno = sp->cno; + ecp->addrcnt = 1; + break; + case 2: + ecp->addr1 = ecp->addr2; + /* FALLTHROUGH */ + case 1: + ecp->addr2.lno = sp->lno; + ecp->addr2.cno = sp->cno; + ecp->addrcnt = 2; + break; + } + + if (ecp->addrcnt == 2 && ecp->addr2.lno < ecp->addr1.lno) { + msgq(sp, M_ERR, + "094|The second address is smaller than the first"); + *errp = 1; + } + return (0); +} + +/* + * ex_line -- + * Get a single line address specifier. + * + * The way the "previous context" mark worked was that any "non-relative" + * motion set it. While ex/vi wasn't totally consistent about this, ANY + * numeric address, search pattern, '$', or mark reference in an address + * was considered non-relative, and set the value. Which should explain + * why we're hacking marks down here. The problem was that the mark was + * only set if the command was called, i.e. we have to set a flag and test + * it later. + * + * XXX + * This is probably still not exactly historic practice, although I think + * it's fairly close. + */ +static int +ex_line(sp, ecp, mp, isaddrp, errp) + SCR *sp; + EXCMD *ecp; + MARK *mp; + int *isaddrp, *errp; +{ + enum nresult nret; + EX_PRIVATE *exp; + GS *gp; + long total, val; + int isneg; + int (*sf) __P((SCR *, MARK *, MARK *, char *, size_t, char **, u_int)); + char *endp; + + gp = sp->gp; + exp = EXP(sp); + + *isaddrp = *errp = 0; + F_CLR(ecp, E_DELTA); + + /* No addresses permitted until a file has been read in. */ + if (sp->ep == NULL && strchr("$0123456789'\\/?.+-^", *ecp->cp)) { + ex_badaddr(sp, NULL, A_EMPTY, NUM_OK); + *errp = 1; + return (0); + } + + switch (*ecp->cp) { + case '$': /* Last line in the file. */ + *isaddrp = 1; + F_SET(ecp, E_ABSMARK); + + mp->cno = 0; + if (db_last(sp, &mp->lno)) + return (1); + ++ecp->cp; + --ecp->clen; + break; /* Absolute line number. */ + case '0': case '1': case '2': case '3': case '4': + case '5': case '6': case '7': case '8': case '9': + *isaddrp = 1; + F_SET(ecp, E_ABSMARK); + + if ((nret = nget_slong(&val, ecp->cp, &endp, 10)) != NUM_OK) { + ex_badaddr(sp, NULL, A_NOTSET, nret); + *errp = 1; + return (0); + } + if (!NPFITS(MAX_REC_NUMBER, 0, val)) { + ex_badaddr(sp, NULL, A_NOTSET, NUM_OVER); + *errp = 1; + return (0); + } + mp->lno = val; + mp->cno = 0; + ecp->clen -= (endp - ecp->cp); + ecp->cp = endp; + break; + case '\'': /* Use a mark. */ + *isaddrp = 1; + F_SET(ecp, E_ABSMARK); + + if (ecp->clen == 1) { + msgq(sp, M_ERR, "095|No mark name supplied"); + *errp = 1; + return (0); + } + if (mark_get(sp, ecp->cp[1], mp, M_ERR)) { + *errp = 1; + return (0); + } + ecp->cp += 2; + ecp->clen -= 2; + break; + case '\\': /* Search: forward/backward. */ + /* + * !!! + * I can't find any difference between // and \/ or between + * ?? and \?. Mark Horton doesn't remember there being any + * difference. C'est la vie. + */ + if (ecp->clen < 2 || + ecp->cp[1] != '/' && ecp->cp[1] != '?') { + msgq(sp, M_ERR, "096|\\ not followed by / or ?"); + *errp = 1; + return (0); + } + ++ecp->cp; + --ecp->clen; + sf = ecp->cp[0] == '/' ? f_search : b_search; + goto search; + case '/': /* Search forward. */ + sf = f_search; + goto search; + case '?': /* Search backward. */ + sf = b_search; + +search: mp->lno = sp->lno; + mp->cno = sp->cno; + if (sf(sp, mp, mp, ecp->cp, ecp->clen, &endp, + SEARCH_MSG | SEARCH_PARSE | SEARCH_SET | + (F_ISSET(ecp, E_SEARCH_WMSG) ? SEARCH_WMSG : 0))) { + *errp = 1; + return (0); + } + + /* Fix up the command pointers. */ + ecp->clen -= (endp - ecp->cp); + ecp->cp = endp; + + *isaddrp = 1; + F_SET(ecp, E_ABSMARK); + break; + case '.': /* Current position. */ + *isaddrp = 1; + mp->cno = sp->cno; + + /* If an empty file, then '.' is 0, not 1. */ + if (sp->lno == 1) { + if (db_last(sp, &mp->lno)) + return (1); + if (mp->lno != 0) + mp->lno = 1; + } else + mp->lno = sp->lno; + + /* + * !!! + * Historically, .<number> was the same as .+<number>, i.e. + * the '+' could be omitted. (This feature is found in ed + * as well.) + */ + if (ecp->clen > 1 && isdigit(ecp->cp[1])) + *ecp->cp = '+'; + else { + ++ecp->cp; + --ecp->clen; + } + break; + } + + /* Skip trailing <blank>s. */ + for (; ecp->clen > 0 && + isblank(ecp->cp[0]); ++ecp->cp, --ecp->clen); + + /* + * Evaluate any offset. If no address yet found, the offset + * is relative to ".". + */ + total = 0; + if (ecp->clen != 0 && (isdigit(ecp->cp[0]) || + ecp->cp[0] == '+' || ecp->cp[0] == '-' || + ecp->cp[0] == '^')) { + if (!*isaddrp) { + *isaddrp = 1; + mp->lno = sp->lno; + mp->cno = sp->cno; + } + /* + * Evaluate an offset, defined as: + * + * [+-^<blank>]*[<blank>]*[0-9]* + * + * The rough translation is any number of signs, optionally + * followed by numbers, or a number by itself, all <blank> + * separated. + * + * !!! + * All address offsets were additive, e.g. "2 2 3p" was the + * same as "7p", or, "/ZZZ/ 2" was the same as "/ZZZ/+2". + * Note, however, "2 /ZZZ/" was an error. It was also legal + * to insert signs without numbers, so "3 - 2" was legal, and + * equal to 4. + * + * !!! + * Offsets were historically permitted for any line address, + * e.g. the command "1,2 copy 2 2 2 2" copied lines 1,2 after + * line 8. + * + * !!! + * Offsets were historically permitted for search commands, + * and handled as addresses: "/pattern/2 2 2" was legal, and + * referenced the 6th line after pattern. + */ + F_SET(ecp, E_DELTA); + for (;;) { + for (; ecp->clen > 0 && isblank(ecp->cp[0]); + ++ecp->cp, --ecp->clen); + if (ecp->clen == 0 || !isdigit(ecp->cp[0]) && + ecp->cp[0] != '+' && ecp->cp[0] != '-' && + ecp->cp[0] != '^') + break; + if (!isdigit(ecp->cp[0]) && + !isdigit(ecp->cp[1])) { + total += ecp->cp[0] == '+' ? 1 : -1; + --ecp->clen; + ++ecp->cp; + } else { + if (ecp->cp[0] == '-' || + ecp->cp[0] == '^') { + ++ecp->cp; + --ecp->clen; + isneg = 1; + } else + isneg = 0; + + /* Get a signed long, add it to the total. */ + if ((nret = nget_slong(&val, + ecp->cp, &endp, 10)) != NUM_OK || + (nret = NADD_SLONG(sp, + total, val)) != NUM_OK) { + ex_badaddr(sp, NULL, A_NOTSET, nret); + *errp = 1; + return (0); + } + total += isneg ? -val : val; + ecp->clen -= (endp - ecp->cp); + ecp->cp = endp; + } + } + } + + /* + * Any value less than 0 is an error. Make sure that the new value + * will fit into a recno_t. + */ + if (*isaddrp && total != 0) { + if (total < 0) { + if (-total > mp->lno) { + msgq(sp, M_ERR, + "097|Reference to a line number less than 0"); + *errp = 1; + return (0); + } + } else + if (!NPFITS(MAX_REC_NUMBER, mp->lno, total)) { + ex_badaddr(sp, NULL, A_NOTSET, NUM_OVER); + *errp = 1; + return (0); + } + mp->lno += total; + } + return (0); +} + + +/* + * ex_load -- + * Load up the next command, which may be an @ buffer or global command. + */ +static int +ex_load(sp) + SCR *sp; +{ + GS *gp; + EXCMD *ecp; + RANGE *rp; + + F_CLR(sp, SC_EX_GLOBAL); + + /* + * Lose any exhausted commands. We know that the first command + * can't be an AGV command, which makes things a bit easier. + */ + for (gp = sp->gp;;) { + /* + * If we're back to the original structure, leave it around, + * but discard any allocated source name, we've returned to + * the beginning of the command stack. + */ + if ((ecp = gp->ecq.lh_first) == &gp->excmd) { + if (F_ISSET(ecp, E_NAMEDISCARD)) { + free(ecp->if_name); + ecp->if_name = NULL; + } + return (0); + } + + /* + * ecp->clen will be 0 for the first discarded command, but + * may not be 0 for subsequent ones, e.g. if the original + * command was ":g/xx/@a|s/b/c/", then when we discard the + * command pushed on the stack by the @a, we have to resume + * the global command which included the substitute command. + */ + if (ecp->clen != 0) + return (0); + + /* + * If it's an @, global or v command, we may need to continue + * the command on a different line. + */ + if (FL_ISSET(ecp->agv_flags, AGV_ALL)) { + /* Discard any exhausted ranges. */ + while ((rp = ecp->rq.cqh_first) != (void *)&ecp->rq) + if (rp->start > rp->stop) { + CIRCLEQ_REMOVE(&ecp->rq, rp, q); + free(rp); + } else + break; + + /* If there's another range, continue with it. */ + if (rp != (void *)&ecp->rq) + break; + + /* If it's a global/v command, fix up the last line. */ + if (FL_ISSET(ecp->agv_flags, + AGV_GLOBAL | AGV_V) && ecp->range_lno != OOBLNO) + if (db_exist(sp, ecp->range_lno)) + sp->lno = ecp->range_lno; + else { + if (db_last(sp, &sp->lno)) + return (1); + if (sp->lno == 0) + sp->lno = 1; + } + free(ecp->o_cp); + } + + /* Discard the EXCMD. */ + LIST_REMOVE(ecp, q); + free(ecp); + } + + /* + * We only get here if it's an active @, global or v command. Set + * the current line number, and get a new copy of the command for + * the parser. Note, the original pointer almost certainly moved, + * so we have play games. + */ + ecp->cp = ecp->o_cp; + memcpy(ecp->cp, ecp->cp + ecp->o_clen, ecp->o_clen); + ecp->clen = ecp->o_clen; + ecp->range_lno = sp->lno = rp->start++; + + if (FL_ISSET(ecp->agv_flags, AGV_GLOBAL | AGV_V)) + F_SET(sp, SC_EX_GLOBAL); + return (0); +} + +/* + * ex_discard -- + * Discard any pending ex commands. + */ +static int +ex_discard(sp) + SCR *sp; +{ + GS *gp; + EXCMD *ecp; + RANGE *rp; + + /* + * We know the first command can't be an AGV command, so we don't + * process it specially. We do, however, nail the command itself. + */ + for (gp = sp->gp; (ecp = gp->ecq.lh_first) != &gp->excmd;) { + if (FL_ISSET(ecp->agv_flags, AGV_ALL)) { + while ((rp = ecp->rq.cqh_first) != (void *)&ecp->rq) { + CIRCLEQ_REMOVE(&ecp->rq, rp, q); + free(rp); + } + free(ecp->o_cp); + } + LIST_REMOVE(ecp, q); + free(ecp); + } + gp->ecq.lh_first->clen = 0; + return (0); +} + +/* + * ex_unknown -- + * Display an unknown command name. + */ +static void +ex_unknown(sp, cmd, len) + SCR *sp; + char *cmd; + size_t len; +{ + size_t blen; + char *bp; + + GET_SPACE_GOTO(sp, bp, blen, len + 1); + bp[len] = '\0'; + memcpy(bp, cmd, len); + msgq_str(sp, M_ERR, bp, "098|The %s command is unknown"); + FREE_SPACE(sp, bp, blen); + +alloc_err: + return; +} + +/* + * ex_is_abbrev - + * The vi text input routine needs to know if ex thinks this is an + * [un]abbreviate command, so it can turn off abbreviations. See + * the usual ranting in the vi/v_txt_ev.c:txt_abbrev() routine. + * + * PUBLIC: int ex_is_abbrev __P((char *, size_t)); + */ +int +ex_is_abbrev(name, len) + char *name; + size_t len; +{ + EXCMDLIST const *cp; + + return ((cp = ex_comm_search(name, len)) != NULL && + (cp == &cmds[C_ABBR] || cp == &cmds[C_UNABBREVIATE])); +} + +/* + * ex_is_unmap - + * The vi text input routine needs to know if ex thinks this is an + * unmap command, so it can turn off input mapping. See the usual + * ranting in the vi/v_txt_ev.c:txt_unmap() routine. + * + * PUBLIC: int ex_is_unmap __P((char *, size_t)); + */ +int +ex_is_unmap(name, len) + char *name; + size_t len; +{ + EXCMDLIST const *cp; + + /* + * The command the vi input routines are really interested in + * is "unmap!", not just unmap. + */ + if (name[len - 1] != '!') + return (0); + --len; + return ((cp = ex_comm_search(name, len)) != NULL && + cp == &cmds[C_UNMAP]); +} + +/* + * ex_comm_search -- + * Search for a command name. + */ +static EXCMDLIST const * +ex_comm_search(name, len) + char *name; + size_t len; +{ + EXCMDLIST const *cp; + + for (cp = cmds; cp->name != NULL; ++cp) { + if (cp->name[0] > name[0]) + return (NULL); + if (cp->name[0] != name[0]) + continue; + if (!memcmp(name, cp->name, len)) + return (cp); + } + return (NULL); +} + +/* + * ex_badaddr -- + * Display a bad address message. + * + * PUBLIC: void ex_badaddr + * PUBLIC: __P((SCR *, EXCMDLIST const *, enum badaddr, enum nresult)); + */ +void +ex_badaddr(sp, cp, ba, nret) + SCR *sp; + EXCMDLIST const *cp; + enum badaddr ba; + enum nresult nret; +{ + recno_t lno; + + switch (nret) { + case NUM_OK: + break; + case NUM_ERR: + msgq(sp, M_SYSERR, NULL); + return; + case NUM_OVER: + msgq(sp, M_ERR, "099|Address value overflow"); + return; + case NUM_UNDER: + msgq(sp, M_ERR, "100|Address value underflow"); + return; + } + + /* + * When encountering an address error, tell the user if there's no + * underlying file, that's the real problem. + */ + if (sp->ep == NULL) { + ex_emsg(sp, cp->name, EXM_NOFILEYET); + return; + } + + switch (ba) { + case A_COMBO: + msgq(sp, M_ERR, "101|Illegal address combination"); + break; + case A_EOF: + if (db_last(sp, &lno)) + return; + if (lno != 0) { + msgq(sp, M_ERR, + "102|Illegal address: only %lu lines in the file", + lno); + break; + } + /* FALLTHROUGH */ + case A_EMPTY: + msgq(sp, M_ERR, "103|Illegal address: the file is empty"); + break; + case A_NOTSET: + abort(); + /* NOTREACHED */ + case A_ZERO: + msgq(sp, M_ERR, + "104|The %s command doesn't permit an address of 0", + cp->name); + break; + } + return; +} + +#if defined(DEBUG) && defined(COMLOG) +/* + * ex_comlog -- + * Log ex commands. + */ +static void +ex_comlog(sp, ecp) + SCR *sp; + EXCMD *ecp; +{ + TRACE(sp, "ecmd: %s", ecp->cmd->name); + if (ecp->addrcnt > 0) { + TRACE(sp, " a1 %d", ecp->addr1.lno); + if (ecp->addrcnt > 1) + TRACE(sp, " a2: %d", ecp->addr2.lno); + } + if (ecp->lineno) + TRACE(sp, " line %d", ecp->lineno); + if (ecp->flags) + TRACE(sp, " flags 0x%x", ecp->flags); + if (F_ISSET(&exc, E_BUFFER)) + TRACE(sp, " buffer %c", ecp->buffer); + if (ecp->argc) + for (cnt = 0; cnt < ecp->argc; ++cnt) + TRACE(sp, " arg %d: {%s}", cnt, ecp->argv[cnt]->bp); + TRACE(sp, "\n"); +} +#endif |
