| File: | src/usr.bin/vi/build/../ex/ex_bang.c |
| Warning: | line 148, column 3 Value stored to 'rval' is never read |
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| 1 | /* $OpenBSD: ex_bang.c,v 1.11 2017/04/18 01:45:35 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 | #include <sys/time.h> |
| 17 | |
| 18 | #include <bitstring.h> |
| 19 | #include <errno(*__errno()).h> |
| 20 | #include <limits.h> |
| 21 | #include <stdio.h> |
| 22 | #include <stdlib.h> |
| 23 | #include <string.h> |
| 24 | #include <unistd.h> |
| 25 | |
| 26 | #include "../common/common.h" |
| 27 | #include "../vi/vi.h" |
| 28 | |
| 29 | /* |
| 30 | * ex_bang -- :[line [,line]] ! command |
| 31 | * |
| 32 | * Pass the rest of the line after the ! character to the program named by |
| 33 | * the O_SHELL option. |
| 34 | * |
| 35 | * Historical vi did NOT do shell expansion on the arguments before passing |
| 36 | * them, only file name expansion. This means that the O_SHELL program got |
| 37 | * "$t" as an argument if that is what the user entered. Also, there's a |
| 38 | * special expansion done for the bang command. Any exclamation points in |
| 39 | * the user's argument are replaced by the last, expanded ! command. |
| 40 | * |
| 41 | * There's some fairly amazing slop in this routine to make the different |
| 42 | * ways of getting here display the right things. It took a long time to |
| 43 | * get it right (wrong?), so be careful. |
| 44 | * |
| 45 | * PUBLIC: int ex_bang(SCR *, EXCMD *); |
| 46 | */ |
| 47 | int |
| 48 | ex_bang(SCR *sp, EXCMD *cmdp) |
| 49 | { |
| 50 | enum filtertype ftype; |
| 51 | ARGS *ap; |
| 52 | EX_PRIVATE *exp; |
| 53 | MARK rm; |
| 54 | recno_t lno; |
| 55 | int rval; |
| 56 | const char *msg; |
| 57 | |
| 58 | ap = cmdp->argv[0]; |
| 59 | if (ap->len == 0) { |
| 60 | ex_emsg(sp, cmdp->cmd->usage, EXM_USAGE); |
| 61 | return (1); |
| 62 | } |
| 63 | |
| 64 | /* Set the "last bang command" remembered value. */ |
| 65 | exp = EXP(sp)((EX_PRIVATE *)((sp)->ex_private)); |
| 66 | free(exp->lastbcomm); |
| 67 | if ((exp->lastbcomm = strdup(ap->bp)) == NULL((void *)0)) { |
| 68 | msgq(sp, M_SYSERR, NULL((void *)0)); |
| 69 | return (1); |
| 70 | } |
| 71 | |
| 72 | /* |
| 73 | * If the command was modified by the expansion, it was historically |
| 74 | * redisplayed. |
| 75 | */ |
| 76 | if (F_ISSET(cmdp, E_MODIFY)(((cmdp)->flags) & ((0x00200000))) && !F_ISSET(sp, SC_EX_SILENT)(((sp)->flags) & ((0x00040000)))) { |
| 77 | /* |
| 78 | * Display the command if modified. Historic ex/vi displayed |
| 79 | * the command if it was modified due to file name and/or bang |
| 80 | * expansion. If piping lines in vi, it would be immediately |
| 81 | * overwritten by any error or line change reporting. |
| 82 | */ |
| 83 | if (F_ISSET(sp, SC_VI)(((sp)->flags) & ((0x00000002)))) |
| 84 | vs_update(sp, "!", ap->bp); |
| 85 | else { |
| 86 | (void)ex_printf(sp, "!%s\n", ap->bp); |
| 87 | (void)ex_fflush(sp); |
| 88 | } |
| 89 | } |
| 90 | |
| 91 | /* |
| 92 | * If no addresses were specified, run the command. If there's an |
| 93 | * underlying file, it's been modified and autowrite is set, write |
| 94 | * the file back. If the file has been modified, autowrite is not |
| 95 | * set and the warn option is set, tell the user about the file. |
| 96 | */ |
| 97 | if (cmdp->addrcnt == 0) { |
| 98 | msg = NULL((void *)0); |
| 99 | if (sp->ep != NULL((void *)0) && F_ISSET(sp->ep, F_MODIFIED)(((sp->ep)->flags) & ((0x004)))) { |
| 100 | if (O_ISSET(sp, O_AUTOWRITE)((((&(((sp)))->opts[(((O_AUTOWRITE)))])->flags) & ((0x01))) ? (((sp)))->gp->opts[(((sp)))->opts[(((O_AUTOWRITE )))].o_cur.val].o_cur.val : (((sp)))->opts[(((O_AUTOWRITE) ))].o_cur.val)) { |
| 101 | if (file_aw(sp, FS_ALL0x001)) |
| 102 | return (0); |
| 103 | } else if (O_ISSET(sp, O_WARN)((((&(((sp)))->opts[(((O_WARN)))])->flags) & (( 0x01))) ? (((sp)))->gp->opts[(((sp)))->opts[(((O_WARN )))].o_cur.val].o_cur.val : (((sp)))->opts[(((O_WARN)))].o_cur .val) && |
| 104 | !F_ISSET(sp, SC_EX_SILENT)(((sp)->flags) & ((0x00040000)))) |
| 105 | msg = "File modified since last write."; |
| 106 | } |
| 107 | |
| 108 | /* If we're still in a vi screen, move out explicitly. */ |
| 109 | (void)ex_exec_proc(sp, |
| 110 | cmdp, ap->bp, msg, !F_ISSET(sp, SC_EX | SC_SCR_EXWROTE)(((sp)->flags) & ((0x00000001 | 0x00000010)))); |
| 111 | } |
| 112 | |
| 113 | /* |
| 114 | * If addresses were specified, pipe lines from the file through the |
| 115 | * command. |
| 116 | * |
| 117 | * Historically, vi lines were replaced by both the stdout and stderr |
| 118 | * lines of the command, but ex lines by only the stdout lines. This |
| 119 | * makes no sense to me, so nvi makes it consistent for both, and |
| 120 | * matches vi's historic behavior. |
| 121 | */ |
| 122 | else { |
| 123 | NEEDFILE(sp, cmdp){ if ((sp)->ep == ((void *)0)) { ex_emsg((sp), (cmdp)-> cmd->name, EXM_NOFILEYET); return (1); } }; |
| 124 | |
| 125 | /* Autoprint is set historically, even if the command fails. */ |
| 126 | F_SET(cmdp, E_AUTOPRINT)(((cmdp)->flags) |= ((0x00000040))); |
| 127 | |
| 128 | /* |
| 129 | * !!! |
| 130 | * Historical vi permitted "!!" in an empty file. When this |
| 131 | * happens, we arrive here with two addresses of 1,1 and a |
| 132 | * bad attitude. The simple solution is to turn it into a |
| 133 | * FILTER_READ operation, with the exception that stdin isn't |
| 134 | * opened for the utility, and the cursor position isn't the |
| 135 | * same. The only historic glitch (I think) is that we don't |
| 136 | * put an empty line into the default cut buffer, as historic |
| 137 | * vi did. Imagine, if you can, my disappointment. |
| 138 | */ |
| 139 | ftype = FILTER_BANG; |
| 140 | if (cmdp->addr1.lno == 1 && cmdp->addr2.lno == 1) { |
| 141 | if (db_last(sp, &lno)) |
| 142 | return (1); |
| 143 | if (lno == 0) { |
| 144 | cmdp->addr1.lno = cmdp->addr2.lno = 0; |
| 145 | ftype = FILTER_RBANG; |
| 146 | } |
| 147 | } |
| 148 | rval = ex_filter(sp, cmdp, |
Value stored to 'rval' is never read | |
| 149 | &cmdp->addr1, &cmdp->addr2, &rm, ap->bp, ftype); |
| 150 | |
| 151 | /* |
| 152 | * If in vi mode, move to the first nonblank. |
| 153 | * |
| 154 | * !!! |
| 155 | * Historic vi wasn't consistent in this area -- if you used |
| 156 | * a forward motion it moved to the first nonblank, but if you |
| 157 | * did a backward motion it didn't. And, if you followed a |
| 158 | * backward motion with a forward motion, it wouldn't move to |
| 159 | * the nonblank for either. Going to the nonblank generally |
| 160 | * seems more useful and consistent, so we do it. |
| 161 | */ |
| 162 | sp->lno = rm.lno; |
| 163 | if (F_ISSET(sp, SC_VI)(((sp)->flags) & ((0x00000002)))) { |
| 164 | sp->cno = 0; |
| 165 | (void)nonblank(sp, sp->lno, &sp->cno); |
| 166 | } else |
| 167 | sp->cno = rm.cno; |
| 168 | } |
| 169 | |
| 170 | /* Ex terminates with a bang, even if the command fails. */ |
| 171 | if (!F_ISSET(sp, SC_VI)(((sp)->flags) & ((0x00000002))) && !F_ISSET(sp, SC_EX_SILENT)(((sp)->flags) & ((0x00040000)))) |
| 172 | (void)ex_puts(sp, "!\n"); |
| 173 | |
| 174 | /* |
| 175 | * XXX |
| 176 | * The ! commands never return an error, so that autoprint always |
| 177 | * happens in the ex parser. |
| 178 | */ |
| 179 | return (0); |
| 180 | } |