/* $OpenBSD: ex_read.c,v 1.14 2017/04/18 01:45:35 deraadt Exp $ */ /*- * 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" #include #include #include #include #include #include #include #include #include #include #include #include "../common/common.h" #include "../vi/vi.h" /* * ex_read -- :read [file] * :read [!cmd] * Read from a file or utility. * * !!! * Historical vi wouldn't undo a filter read, for no apparent reason. * * PUBLIC: int ex_read(SCR *, EXCMD *); */ int ex_read(SCR *sp, EXCMD *cmdp) { enum { R_ARG, R_EXPANDARG, R_FILTER } which; struct stat sb; CHAR_T *arg, *name; EX_PRIVATE *exp; FILE *fp; FREF *frp; GS *gp; MARK rm; recno_t nlines; size_t arglen; int argc, rval; char *p; gp = sp->gp; /* * 0 args: read the current pathname. * 1 args: check for "read !arg". */ switch (cmdp->argc) { case 0: which = R_ARG; arg = NULL; /* unused */ arglen = 0; /* unused */ break; case 1: arg = cmdp->argv[0]->bp; arglen = cmdp->argv[0]->len; if (*arg == '!') { ++arg; --arglen; which = R_FILTER; /* Secure means no shell access. */ if (O_ISSET(sp, O_SECURE)) { ex_emsg(sp, cmdp->cmd->name, EXM_SECURE_F); return (1); } } else which = R_EXPANDARG; break; default: abort(); /* NOTREACHED */ } /* Load a temporary file if no file being edited. */ if (sp->ep == NULL) { if ((frp = file_add(sp, NULL)) == NULL) return (1); if (file_init(sp, frp, NULL, 0)) return (1); } switch (which) { case R_FILTER: /* * File name and bang expand the user's argument. If * we don't get an additional argument, it's illegal. */ argc = cmdp->argc; if (argv_exp1(sp, cmdp, arg, arglen, 1)) return (1); if (argc == cmdp->argc) { ex_emsg(sp, cmdp->cmd->usage, EXM_USAGE); return (1); } argc = cmdp->argc - 1; /* Set the last bang command. */ exp = EXP(sp); free(exp->lastbcomm); if ((exp->lastbcomm = strdup(cmdp->argv[argc]->bp)) == NULL) { msgq(sp, M_SYSERR, NULL); return (1); } /* * Vi redisplayed the user's argument if it changed, ex * always displayed a !, plus the user's argument if it * changed. */ if (F_ISSET(sp, SC_VI)) { if (F_ISSET(cmdp, E_MODIFY)) (void)vs_update(sp, "!", cmdp->argv[argc]->bp); } else { if (F_ISSET(cmdp, E_MODIFY)) (void)ex_printf(sp, "!%s\n", cmdp->argv[argc]->bp); else (void)ex_puts(sp, "!\n"); (void)ex_fflush(sp); } /* * Historically, filter reads as the first ex command didn't * wait for the user. If SC_SCR_EXWROTE not already set, set * the don't-wait flag. */ if (!F_ISSET(sp, SC_SCR_EXWROTE)) F_SET(sp, SC_EX_WAIT_NO); /* * Switch into ex canonical mode. The reason to restore the * original terminal modes for read filters is so that users * can do things like ":r! cat /dev/tty". * * !!! * We do not output an extra , so that we don't touch * the screen on a normal read. */ if (F_ISSET(sp, SC_VI)) { if (gp->scr_screen(sp, SC_EX)) { ex_emsg(sp, cmdp->cmd->name, EXM_NOCANON_F); return (1); } /* * !!! * Historically, the read command doesn't switch to * the alternate X11 xterm screen, if doing a filter * read -- don't set SA_ALTERNATE. */ F_SET(sp, SC_SCR_EX | SC_SCR_EXWROTE); } if (ex_filter(sp, cmdp, &cmdp->addr1, NULL, &rm, cmdp->argv[argc]->bp, FILTER_READ)) return (1); /* The filter version of read set the autoprint flag. */ F_SET(cmdp, E_AUTOPRINT); /* * If in vi mode, move to the first nonblank. Might have * switched into ex mode, so saved the original SC_VI value. */ sp->lno = rm.lno; if (F_ISSET(sp, SC_VI)) { sp->cno = 0; (void)nonblank(sp, sp->lno, &sp->cno); } return (0); case R_ARG: name = sp->frp->name; break; case R_EXPANDARG: if (argv_exp2(sp, cmdp, arg, arglen)) return (1); /* * 0 args: impossible. * 1 args: impossible (I hope). * 2 args: read it. * >2 args: object, too many args. * * The 1 args case depends on the argv_sexp() function refusing * to return success without at least one non-blank character. */ switch (cmdp->argc) { case 0: case 1: abort(); /* NOTREACHED */ case 2: name = cmdp->argv[1]->bp; /* * !!! * Historically, the read and write commands renamed * "unnamed" files, or, if the file had a name, set * the alternate file name. */ if (F_ISSET(sp->frp, FR_TMPFILE) && !F_ISSET(sp->frp, FR_EXNAMED)) { if ((p = v_strdup(sp, cmdp->argv[1]->bp, cmdp->argv[1]->len)) != NULL) { free(sp->frp->name); sp->frp->name = p; } /* * The file has a real name, it's no longer a * temporary, clear the temporary file flags. */ F_CLR(sp->frp, FR_TMPEXIT | FR_TMPFILE); F_SET(sp->frp, FR_NAMECHANGE | FR_EXNAMED); /* Notify the screen. */ (void)sp->gp->scr_rename(sp, sp->frp->name, 1); } else set_alt_name(sp, name); break; default: ex_emsg(sp, cmdp->argv[0]->bp, EXM_FILECOUNT); return (1); } break; default: abort(); /* NOTREACHED */ } /* * !!! * Historically, vi did not permit reads from non-regular files, nor * did it distinguish between "read !" and "read!", so there was no * way to "force" it. We permit reading from named pipes too, since * they didn't exist when the original implementation of vi was done * and they seem a reasonable addition. */ if ((fp = fopen(name, "r")) == NULL || fstat(fileno(fp), &sb)) { msgq_str(sp, M_SYSERR, name, "%s"); return (1); } if (!S_ISFIFO(sb.st_mode) && !S_ISREG(sb.st_mode)) { (void)fclose(fp); msgq(sp, M_ERR, "Only regular files and named pipes may be read"); return (1); } /* Try and get a lock. */ if (file_lock(sp, NULL, NULL, fileno(fp), 0) == LOCK_UNAVAIL) msgq(sp, M_ERR, "%s: read lock was unavailable", name); rval = ex_readfp(sp, name, fp, &cmdp->addr1, &nlines, 0); /* * In vi, set the cursor to the first line read in, if anything read * in, otherwise, the address. (Historic vi set it to the line after * the address regardless, but since that line may not exist we don't * bother.) * * In ex, set the cursor to the last line read in, if anything read in, * otherwise, the address. */ if (F_ISSET(sp, SC_VI)) { sp->lno = cmdp->addr1.lno; if (nlines) ++sp->lno; } else sp->lno = cmdp->addr1.lno + nlines; return (rval); } /* * ex_readfp -- * Read lines into the file. * * PUBLIC: int ex_readfp(SCR *, char *, FILE *, MARK *, recno_t *, int); */ int ex_readfp(SCR *sp, char *name, FILE *fp, MARK *fm, recno_t *nlinesp, int silent) { EX_PRIVATE *exp; GS *gp; recno_t lcnt, lno; size_t len; u_long ccnt; /* XXX: can't print off_t portably. */ int nf, rval; char *p; gp = sp->gp; exp = EXP(sp); /* * Add in the lines from the output. Insertion starts at the line * following the address. */ ccnt = 0; lcnt = 0; p = "Reading..."; for (lno = fm->lno; !ex_getline(sp, fp, &len); ++lno, ++lcnt) { if ((lcnt + 1) % INTERRUPT_CHECK == 0) { if (INTERRUPTED(sp)) break; if (!silent) { gp->scr_busy(sp, p, p == NULL ? BUSY_UPDATE : BUSY_ON); p = NULL; } } if (db_append(sp, 1, lno, exp->ibp, len)) goto err; ccnt += len; } if (ferror(fp) || fclose(fp)) goto err; /* Return the number of lines read in. */ if (nlinesp != NULL) *nlinesp = lcnt; if (!silent) { p = msg_print(sp, name, &nf); msgq(sp, M_INFO, "%s: %lu lines, %lu characters", p, lcnt, ccnt); if (nf) FREE_SPACE(sp, p, 0); } rval = 0; if (0) { err: msgq_str(sp, M_SYSERR, name, "%s"); (void)fclose(fp); rval = 1; } if (!silent) gp->scr_busy(sp, NULL, BUSY_OFF); return (rval); }