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      1 /*	$NetBSD: misc.c,v 1.16 2023/08/10 20:36:28 mrg Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1990, 1993, 1994
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * This code is derived from software contributed to Berkeley by
      8  * Cimarron D. Taylor of the University of California, Berkeley.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. Neither the name of the University nor the names of its contributors
     19  *    may be used to endorse or promote products derived from this software
     20  *    without specific prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     32  * SUCH DAMAGE.
     33  */
     34 
     35 #include <sys/cdefs.h>
     36 #ifndef lint
     37 #if 0
     38 static char sccsid[] = "from: @(#)misc.c	8.2 (Berkeley) 4/1/94";
     39 #else
     40 __RCSID("$NetBSD: misc.c,v 1.16 2023/08/10 20:36:28 mrg Exp $");
     41 #endif
     42 #endif /* not lint */
     43 
     44 #include <sys/types.h>
     45 #include <sys/stat.h>
     46 
     47 #include <err.h>
     48 #include <errno.h>
     49 #include <fts.h>
     50 #include <stdio.h>
     51 #include <stdlib.h>
     52 #include <string.h>
     53 #include <unistd.h>
     54 #include <paths.h>
     55 #include <fcntl.h>
     56 
     57 #include "find.h"
     58 
     59 /*
     60  * brace_subst --
     61  *	Replace occurrences of {} in orig with path, and place it in a malloced
     62  *      area of memory set in store.
     63  */
     64 void
     65 brace_subst(char *orig, char **store, char *path, size_t *len)
     66 {
     67 	size_t nlen, plen, rest;
     68 	char ch, *p, *ostore;
     69 
     70 	plen = strlen(path);
     71 	for (p = *store; (ch = *orig) != '\0'; ++orig)
     72 		if (ch == '{' && orig[1] == '}') {
     73 			/* Length of string after the {}. */
     74 			rest = strlen(&orig[2]);
     75 
     76 			nlen = *len;
     77 			while ((p - *store) + plen + rest + 1 > nlen)
     78 				nlen *= 2;
     79 
     80 			if (nlen > *len) {
     81 				ptrdiff_t off = p - *store;
     82 
     83 				ostore = *store;
     84 				if ((*store = realloc(ostore, nlen)) == NULL)
     85 					err(1, "realloc");
     86 				*len = nlen;
     87 				p = *store + off;	/* Relocate. */
     88 			}
     89 			memmove(p, path, plen);
     90 			p += plen;
     91 			++orig;
     92 		} else
     93 			*p++ = ch;
     94 	*p = '\0';
     95 }
     96 
     97 /*
     98  * queryuser --
     99  *	print a message to standard error and then read input from standard
    100  *	input. If the input is 'y' then 1 is returned.
    101  */
    102 int
    103 queryuser(char **argv)
    104 {
    105 	int ch, first, nl;
    106 
    107 	(void)fprintf(stderr, "\"%s", *argv);
    108 	while (*++argv)
    109 		(void)fprintf(stderr, " %s", *argv);
    110 	(void)fprintf(stderr, "\"? ");
    111 	(void)fflush(stderr);
    112 
    113 	first = ch = getchar();
    114 	for (nl = 0;;) {
    115 		if (ch == '\n') {
    116 			nl = 1;
    117 			break;
    118 		}
    119 		if (ch == EOF)
    120 			break;
    121 		ch = getchar();
    122 	}
    123 
    124 	if (!nl) {
    125 		(void)fprintf(stderr, "\n");
    126 		(void)fflush(stderr);
    127 	}
    128         return (first == 'y');
    129 }
    130 
    131 /*
    132  * show_path --
    133  *	called on SIGINFO
    134  */
    135 /* ARGSUSED */
    136 void
    137 show_path(int sig)
    138 {
    139 	extern FTSENT *g_entry;
    140 	static int ttyfd = -2;
    141 	char buf[2048];
    142 	int oerrno, n;
    143 
    144 	if (g_entry == NULL) {
    145 		/*
    146 		 * not initialized yet.
    147 		 * assumption: pointer assignment is atomic.
    148 		 */
    149 		return;
    150 	}
    151 
    152 	oerrno = errno;
    153 	if (ttyfd == -2)
    154 		ttyfd = open(_PATH_TTY, O_RDWR | O_CLOEXEC);
    155 
    156 	if (ttyfd == -1)
    157 		goto out;
    158 
    159 	n = snprintf_ss(buf, sizeof(buf), "%s: path %s\n", getprogname(),
    160 	    g_entry->fts_path);
    161 
    162 	if (n <= 0)
    163 		goto out;
    164 
    165 	write(ttyfd, buf, (size_t)n);
    166 out:
    167 	errno = oerrno;
    168 }
    169