1 /* $OpenBSD: ex_at.c,v 1.8 2009/10/27 23:59:47 deraadt Exp $ */ 2 3 /*- 4 * Copyright (c) 1992, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * Copyright (c) 1992, 1993, 1994, 1995, 1996 7 * Keith Bostic. All rights reserved. 8 * 9 * See the LICENSE file for redistribution information. 10 */ 11 12 #include "config.h" 13 14 #include <sys/types.h> 15 #include <sys/queue.h> 16 17 #include <bitstring.h> 18 #include <ctype.h> 19 #include <limits.h> 20 #include <stdio.h> 21 #include <stdlib.h> 22 #include <string.h> 23 24 #include "../common/common.h" 25 26 /* 27 * ex_at -- :@[@ | buffer] 28 * :*[* | buffer] 29 * 30 * Execute the contents of the buffer. 31 * 32 * PUBLIC: int ex_at(SCR *, EXCMD *); 33 */ 34 int 35 ex_at(sp, cmdp) 36 SCR *sp; 37 EXCMD *cmdp; 38 { 39 CB *cbp; 40 CHAR_T name; 41 EXCMD *ecp; 42 RANGE *rp; 43 TEXT *tp; 44 size_t len; 45 char *p; 46 47 /* 48 * !!! 49 * Historically, [@*]<carriage-return> and [@*][@*] executed the most 50 * recently executed buffer in ex mode. 51 */ 52 name = FL_ISSET(cmdp->iflags, E_C_BUFFER) ? cmdp->buffer : '@'; 53 if (name == '@' || name == '*') { 54 if (!F_ISSET(sp, SC_AT_SET)) { 55 ex_emsg(sp, NULL, EXM_NOPREVBUF); 56 return (1); 57 } 58 name = sp->at_lbuf; 59 } 60 sp->at_lbuf = name; 61 F_SET(sp, SC_AT_SET); 62 63 CBNAME(sp, cbp, name); 64 if (cbp == NULL) { 65 ex_emsg(sp, KEY_NAME(sp, name), EXM_EMPTYBUF); 66 return (1); 67 } 68 69 /* 70 * !!! 71 * Historically the @ command took a range of lines, and the @ buffer 72 * was executed once per line. The historic vi could be trashed by 73 * this because it didn't notice if the underlying file changed, or, 74 * for that matter, if there were no more lines on which to operate. 75 * For example, take a 10 line file, load "%delete" into a buffer, 76 * and enter :8,10@<buffer>. 77 * 78 * The solution is a bit tricky. If the user specifies a range, take 79 * the same approach as for global commands, and discard the command 80 * if exit or switch to a new file/screen. If the user doesn't specify 81 * the range, continue to execute after a file/screen switch, which 82 * means @ buffers are still useful in a multi-screen environment. 83 */ 84 CALLOC_RET(sp, ecp, EXCMD *, 1, sizeof(EXCMD)); 85 CIRCLEQ_INIT(&ecp->rq); 86 CALLOC_RET(sp, rp, RANGE *, 1, sizeof(RANGE)); 87 rp->start = cmdp->addr1.lno; 88 if (F_ISSET(cmdp, E_ADDR_DEF)) { 89 rp->stop = rp->start; 90 FL_SET(ecp->agv_flags, AGV_AT_NORANGE); 91 } else { 92 rp->stop = cmdp->addr2.lno; 93 FL_SET(ecp->agv_flags, AGV_AT); 94 } 95 CIRCLEQ_INSERT_HEAD(&ecp->rq, rp, q); 96 97 /* 98 * Buffers executed in ex mode or from the colon command line in vi 99 * were ex commands. We can't push it on the terminal queue, since 100 * it has to be executed immediately, and we may be in the middle of 101 * an ex command already. Push the command on the ex command stack. 102 * Build two copies of the command. We need two copies because the 103 * ex parser may step on the command string when it's parsing it. 104 */ 105 for (len = 0, tp = CIRCLEQ_LAST(&cbp->textq); 106 tp != CIRCLEQ_END(&cbp->textq); tp = CIRCLEQ_PREV(tp, q)) 107 len += tp->len + 1; 108 109 MALLOC_RET(sp, ecp->cp, char *, len * 2); 110 ecp->o_cp = ecp->cp; 111 ecp->o_clen = len; 112 ecp->cp[len] = '\0'; 113 114 /* Copy the buffer into the command space. */ 115 for (p = ecp->cp + len, tp = CIRCLEQ_LAST(&cbp->textq); 116 tp != CIRCLEQ_END(&cbp->textq); tp = CIRCLEQ_PREV(tp, q)) { 117 memcpy(p, tp->lb, tp->len); 118 p += tp->len; 119 *p++ = '\n'; 120 } 121 122 LIST_INSERT_HEAD(&sp->gp->ecq, ecp, q); 123 return (0); 124 } 125