diff options
Diffstat (limited to 'contrib/nvi/ex/ex_at.c')
| -rw-r--r-- | contrib/nvi/ex/ex_at.c | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/contrib/nvi/ex/ex_at.c b/contrib/nvi/ex/ex_at.c new file mode 100644 index 0000000..e9c6c59 --- /dev/null +++ b/contrib/nvi/ex/ex_at.c @@ -0,0 +1,126 @@ +/*- + * 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_at.c 10.12 (Berkeley) 9/15/96"; +#endif /* not lint */ + +#include <sys/types.h> +#include <sys/queue.h> + +#include <bitstring.h> +#include <ctype.h> +#include <limits.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +#include "../common/common.h" + +/* + * ex_at -- :@[@ | buffer] + * :*[* | buffer] + * + * Execute the contents of the buffer. + * + * PUBLIC: int ex_at __P((SCR *, EXCMD *)); + */ +int +ex_at(sp, cmdp) + SCR *sp; + EXCMD *cmdp; +{ + CB *cbp; + CHAR_T name; + EXCMD *ecp; + RANGE *rp; + TEXT *tp; + size_t len; + char *p; + + /* + * !!! + * Historically, [@*]<carriage-return> and [@*][@*] executed the most + * recently executed buffer in ex mode. + */ + name = FL_ISSET(cmdp->iflags, E_C_BUFFER) ? cmdp->buffer : '@'; + if (name == '@' || name == '*') { + if (!F_ISSET(sp, SC_AT_SET)) { + ex_emsg(sp, NULL, EXM_NOPREVBUF); + return (1); + } + name = sp->at_lbuf; + } + sp->at_lbuf = name; + F_SET(sp, SC_AT_SET); + + CBNAME(sp, cbp, name); + if (cbp == NULL) { + ex_emsg(sp, KEY_NAME(sp, name), EXM_EMPTYBUF); + return (1); + } + + /* + * !!! + * Historically the @ command took a range of lines, and the @ buffer + * was executed once per line. The historic vi could be trashed by + * this because it didn't notice if the underlying file changed, or, + * for that matter, if there were no more lines on which to operate. + * For example, take a 10 line file, load "%delete" into a buffer, + * and enter :8,10@<buffer>. + * + * The solution is a bit tricky. If the user specifies a range, take + * the same approach as for global commands, and discard the command + * if exit or switch to a new file/screen. If the user doesn't specify + * the range, continue to execute after a file/screen switch, which + * means @ buffers are still useful in a multi-screen environment. + */ + CALLOC_RET(sp, ecp, EXCMD *, 1, sizeof(EXCMD)); + CIRCLEQ_INIT(&ecp->rq); + CALLOC_RET(sp, rp, RANGE *, 1, sizeof(RANGE)); + rp->start = cmdp->addr1.lno; + if (F_ISSET(cmdp, E_ADDR_DEF)) { + rp->stop = rp->start; + FL_SET(ecp->agv_flags, AGV_AT_NORANGE); + } else { + rp->stop = cmdp->addr2.lno; + FL_SET(ecp->agv_flags, AGV_AT); + } + CIRCLEQ_INSERT_HEAD(&ecp->rq, rp, q); + + /* + * Buffers executed in ex mode or from the colon command line in vi + * were ex commands. We can't push it on the terminal queue, since + * it has to be executed immediately, and we may be in the middle of + * an ex command already. Push the command on the ex command stack. + * Build two copies of the command. We need two copies because the + * ex parser may step on the command string when it's parsing it. + */ + for (len = 0, tp = cbp->textq.cqh_last; + tp != (void *)&cbp->textq; tp = tp->q.cqe_prev) + len += tp->len + 1; + + MALLOC_RET(sp, ecp->cp, char *, len * 2); + ecp->o_cp = ecp->cp; + ecp->o_clen = len; + ecp->cp[len] = '\0'; + + /* Copy the buffer into the command space. */ + for (p = ecp->cp + len, tp = cbp->textq.cqh_last; + tp != (void *)&cbp->textq; tp = tp->q.cqe_prev) { + memcpy(p, tp->lb, tp->len); + p += tp->len; + *p++ = '\n'; + } + + LIST_INSERT_HEAD(&sp->gp->ecq, ecp, q); + return (0); +} |
