1 /* 2 * Copyright (c) 1983, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #if defined(LIBC_SCCS) && !defined(lint) 31 static char sccsid[] = "@(#)scandir.c 8.3 (Berkeley) 1/2/94"; 32 #endif /* LIBC_SCCS and not lint */ 33 #include <sys/cdefs.h> 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 /* 63 * The DIRSIZ macro is the minimum record length which will hold the directory 64 * entry. This requires the amount of space in struct dirent without the 65 * d_name field, plus enough space for the name and a terminating nul byte 66 * (dp->d_namlen + 1), rounded up to a 4 byte boundary. 67 */ 68 #undef DIRSIZ 69 #define DIRSIZ(dp) \ 70 ((sizeof(struct dirent) - sizeof(dp)->d_name) + \ 71 (((dp)->d_namlen + 1 + 3) &~ 3)) 72 73 int 74 #ifdef I_AM_SCANDIR_B 75 scandir_b(const char *dirname, struct dirent ***namelist, 76 DECLARE_BLOCK(int, select, const struct dirent *), 77 DECLARE_BLOCK(int, dcomp, const struct dirent **, const struct dirent **)) 78 #else 79 scandir(const char *dirname, struct dirent ***namelist, 80 int (*select)(const struct dirent *), int (*dcomp)(const struct dirent **, 81 const struct dirent **)) 82 #endif 83 { 84 struct dirent *d, *p, **names = NULL; 85 size_t numitems; 86 long arraysz; 87 DIR *dirp; 88 89 if ((dirp = opendir(dirname)) == NULL) 90 return(-1); 91 92 arraysz = 32; /* initial estimate of the array size */ 93 names = (struct dirent **)malloc(arraysz * sizeof(struct dirent *)); 94 if (names == NULL) 95 goto fail; 96 97 numitems = 0; 98 while ((d = readdir(dirp)) != NULL) { 99 if (select != NULL && !SELECT(d)) 100 continue; /* just selected names */ 101 /* 102 * Make a minimum size copy of the data 103 */ 104 p = (struct dirent *)malloc(DIRSIZ(d)); 105 if (p == NULL) 106 goto fail; 107 p->d_fileno = d->d_fileno; 108 p->d_type = d->d_type; 109 p->d_reclen = d->d_reclen; 110 p->d_namlen = d->d_namlen; 111 bcopy(d->d_name, p->d_name, p->d_namlen + 1); 112 /* 113 * Check to make sure the array has space left and 114 * realloc the maximum size. 115 */ 116 if (numitems >= arraysz) { 117 struct dirent **names2; 118 119 names2 = reallocarray(names, arraysz, 120 2 * sizeof(struct dirent *)); 121 if (names2 == NULL) { 122 free(p); 123 goto fail; 124 } 125 names = names2; 126 arraysz *= 2; 127 } 128 names[numitems++] = p; 129 } 130 closedir(dirp); 131 if (numitems && dcomp != NULL) 132 #ifdef I_AM_SCANDIR_B 133 qsort_b(names, numitems, sizeof(struct dirent *), (void*)dcomp); 134 #else 135 qsort_r(names, numitems, sizeof(struct dirent *), 136 &dcomp, alphasort_thunk); 137 #endif 138 *namelist = names; 139 return (numitems); 140 141 fail: 142 while (numitems > 0) 143 free(names[--numitems]); 144 free(names); 145 closedir(dirp); 146 return (-1); 147 } 148 149 /* 150 * Alphabetic order comparison routine for those who want it. 151 * POSIX 2008 requires that alphasort() uses strcoll(). 152 */ 153 int 154 alphasort(const struct dirent **d1, const struct dirent **d2) 155 { 156 157 return (strcoll((*d1)->d_name, (*d2)->d_name)); 158 } 159 160 static int 161 alphasort_thunk(void *thunk, const void *p1, const void *p2) 162 { 163 int (*dc)(const struct dirent **, const struct dirent **); 164 165 dc = *(int (**)(const struct dirent **, const struct dirent **))thunk; 166 return (dc((const struct dirent **)p1, (const struct dirent **)p2)); 167 } 168