1 /* $OpenBSD: ex_at.c,v 1.14 2016/05/27 09:18:12 martijn 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(SCR *sp, EXCMD *cmdp) 36 { 37 CB *cbp; 38 CHAR_T name; 39 EXCMD *ecp; 40 RANGE *rp; 41 TEXT *tp; 42 size_t len; 43 char *p; 44 45 /* 46 * !!! 47 * Historically, [@*]<carriage-return> and [@*][@*] executed the most 48 * recently executed buffer in ex mode. 49 */ 50 name = FL_ISSET(cmdp->iflags, E_C_BUFFER) ? cmdp->buffer : '@'; 51 if (name == '@' || name == '*') { 52 if (!F_ISSET(sp, SC_AT_SET)) { 53 ex_emsg(sp, NULL, EXM_NOPREVBUF); 54 return (1); 55 } 56 name = sp->at_lbuf; 57 } 58 sp->at_lbuf = name; 59 F_SET(sp, SC_AT_SET); 60 61 CBNAME(sp, cbp, name); 62 if (cbp == NULL) { 63 ex_emsg(sp, KEY_NAME(sp, name), EXM_EMPTYBUF); 64 return (1); 65 } 66 67 /* 68 * !!! 69 * Historically the @ command took a range of lines, and the @ buffer 70 * was executed once per line. The historic vi could be trashed by 71 * this because it didn't notice if the underlying file changed, or, 72 * for that matter, if there were no more lines on which to operate. 73 * For example, take a 10 line file, load "%delete" into a buffer, 74 * and enter :8,10@<buffer>. 75 * 76 * The solution is a bit tricky. If the user specifies a range, take 77 * the same approach as for global commands, and discard the command 78 * if exit or switch to a new file/screen. If the user doesn't specify 79 * the range, continue to execute after a file/screen switch, which 80 * means @ buffers are still useful in a multi-screen environment. 81 */ 82 CALLOC_RET(sp, ecp, 1, sizeof(EXCMD)); 83 TAILQ_INIT(&ecp->rq); 84 CALLOC_RET(sp, rp, 1, sizeof(RANGE)); 85 rp->start = cmdp->addr1.lno; 86 if (F_ISSET(cmdp, E_ADDR_DEF)) { 87 rp->stop = rp->start; 88 FL_SET(ecp->agv_flags, AGV_AT_NORANGE); 89 } else { 90 rp->stop = cmdp->addr2.lno; 91 FL_SET(ecp->agv_flags, AGV_AT); 92 } 93 TAILQ_INSERT_HEAD(&ecp->rq, rp, q); 94 95 /* 96 * Buffers executed in ex mode or from the colon command line in vi 97 * were ex commands. We can't push it on the terminal queue, since 98 * it has to be executed immediately, and we may be in the middle of 99 * an ex command already. Push the command on the ex command stack. 100 * Build two copies of the command. We need two copies because the 101 * ex parser may step on the command string when it's parsing it. 102 */ 103 len = 0; 104 TAILQ_FOREACH_REVERSE(tp, &cbp->textq, _texth, q) { 105 len += tp->len + 1; 106 } 107 108 MALLOC_RET(sp, ecp->cp, len * 2); 109 ecp->o_cp = ecp->cp; 110 ecp->o_clen = len; 111 ecp->cp[len] = '\0'; 112 113 /* Copy the buffer into the command space. */ 114 p = ecp->cp + len; 115 TAILQ_FOREACH_REVERSE(tp, &cbp->textq, _texth, q) { 116 memcpy(p, tp->lb, tp->len); 117 p += tp->len; 118 *p++ = '\n'; 119 } 120 121 LIST_INSERT_HEAD(&sp->gp->ecq, ecp, q); 122 return (0); 123 } 124