1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1983, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __SCCSID("@(#)scandir.c 8.3 (Berkeley) 1/2/94"); 34 __FBSDID("$FreeBSD$"); 35 36 /* 37 * Scan the directory dirname calling select to make a list of selected 38 * directory entries then sort using qsort and compare routine dcomp. 39 * Returns the number of entries and a pointer to a list of pointers to 40 * struct dirent (through namelist). Returns -1 if there were any errors. 41 */ 42 43 #include "namespace.h" 44 #include <dirent.h> 45 #include <stdlib.h> 46 #include <string.h> 47 #include "un-namespace.h" 48 49 #ifdef I_AM_SCANDIR_B 50 #include "block_abi.h" 51 #define SELECT(x) CALL_BLOCK(select, x) 52 #ifndef __BLOCKS__ 53 void 54 qsort_b(void *, size_t, size_t, void*); 55 #endif 56 #else 57 #define SELECT(x) select(x) 58 #endif 59 60 static int alphasort_thunk(void *thunk, const void *p1, const void *p2); 61 62 int 63 #ifdef I_AM_SCANDIR_B 64 scandir_b(const char *dirname, struct dirent ***namelist, 65 DECLARE_BLOCK(int, select, const struct dirent *), 66 DECLARE_BLOCK(int, dcomp, const struct dirent **, const struct dirent **)) 67 #else 68 scandir(const char *dirname, struct dirent ***namelist, 69 int (*select)(const struct dirent *), int (*dcomp)(const struct dirent **, 70 const struct dirent **)) 71 #endif 72 { 73 struct dirent *d, *p, **names = NULL; 74 size_t arraysz, numitems; 75 DIR *dirp; 76 77 if ((dirp = opendir(dirname)) == NULL) 78 return(-1); 79 80 numitems = 0; 81 arraysz = 32; /* initial estimate of the array size */ 82 names = (struct dirent **)malloc(arraysz * sizeof(struct dirent *)); 83 if (names == NULL) 84 goto fail; 85 86 while ((d = readdir(dirp)) != NULL) { 87 if (select != NULL && !SELECT(d)) 88 continue; /* just selected names */ 89 /* 90 * Make a minimum size copy of the data 91 */ 92 p = (struct dirent *)malloc(_GENERIC_DIRSIZ(d)); 93 if (p == NULL) 94 goto fail; 95 p->d_fileno = d->d_fileno; 96 p->d_type = d->d_type; 97 p->d_reclen = d->d_reclen; 98 p->d_namlen = d->d_namlen; 99 bcopy(d->d_name, p->d_name, p->d_namlen + 1); 100 /* 101 * Check to make sure the array has space left and 102 * realloc the maximum size. 103 */ 104 if (numitems >= arraysz) { 105 struct dirent **names2; 106 107 names2 = reallocarray(names, arraysz, 108 2 * sizeof(struct dirent *)); 109 if (names2 == NULL) { 110 free(p); 111 goto fail; 112 } 113 names = names2; 114 arraysz *= 2; 115 } 116 names[numitems++] = p; 117 } 118 closedir(dirp); 119 if (numitems && dcomp != NULL) 120 #ifdef I_AM_SCANDIR_B 121 qsort_b(names, numitems, sizeof(struct dirent *), (void*)dcomp); 122 #else 123 qsort_r(names, numitems, sizeof(struct dirent *), 124 &dcomp, alphasort_thunk); 125 #endif 126 *namelist = names; 127 return (numitems); 128 129 fail: 130 while (numitems > 0) 131 free(names[--numitems]); 132 free(names); 133 closedir(dirp); 134 return (-1); 135 } 136 137 /* 138 * Alphabetic order comparison routine for those who want it. 139 * POSIX 2008 requires that alphasort() uses strcoll(). 140 */ 141 int 142 alphasort(const struct dirent **d1, const struct dirent **d2) 143 { 144 145 return (strcoll((*d1)->d_name, (*d2)->d_name)); 146 } 147 148 static int 149 alphasort_thunk(void *thunk, const void *p1, const void *p2) 150 { 151 int (*dc)(const struct dirent **, const struct dirent **); 152 153 dc = *(int (**)(const struct dirent **, const struct dirent **))thunk; 154 return (dc((const struct dirent **)p1, (const struct dirent **)p2)); 155 } 156