vx32

Local 9vx git repository for patches.
git clone git://r-36.net/vx32
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mktemp.c (4208B)

      1 /*
      2  * Copyright (c) 1987, 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. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *	This product includes software developed by the University of
     16  *	California, Berkeley and its contributors.
     17  * 4. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  */
     33 
     34 #include <sys/types.h>
     35 #include <sys/stat.h>
     36 #include <fcntl.h>
     37 #include <errno.h>
     38 #include <stdio.h>
     39 #include <stdlib.h>
     40 #include <string.h>
     41 #include <ctype.h>
     42 #include <unistd.h>
     43 
     44 char *_mktemp(char *);
     45 
     46 static int _gettemp(char *, int *, int, int);
     47 
     48 static const unsigned char padchar[] =
     49 "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
     50 
     51 int
     52 mkstemps(path, slen)
     53 	char *path;
     54 	int slen;
     55 {
     56 	int fd;
     57 
     58 	return (_gettemp(path, &fd, 0, slen) ? fd : -1);
     59 }
     60 
     61 int
     62 mkstemp(path)
     63 	char *path;
     64 {
     65 	int fd;
     66 
     67 	return (_gettemp(path, &fd, 0, 0) ? fd : -1);
     68 }
     69 
     70 char *
     71 mkdtemp(path)
     72 	char *path;
     73 {
     74 	return (_gettemp(path, (int *)NULL, 1, 0) ? path : (char *)NULL);
     75 }
     76 
     77 char *
     78 _mktemp(path)
     79 	char *path;
     80 {
     81 	return (_gettemp(path, (int *)NULL, 0, 0) ? path : (char *)NULL);
     82 }
     83 
     84 char *
     85 mktemp(path)
     86 	char *path;
     87 {
     88 	return (_mktemp(path));
     89 }
     90 
     91 static int
     92 _gettemp(path, doopen, domkdir, slen)
     93 	char *path;
     94 	int *doopen;
     95 	int domkdir;
     96 	int slen;
     97 {
     98 	char *start, *trv, *suffp;
     99 	char *pad;
    100 	struct stat sbuf;
    101 	int rval;
    102 	uint32_t randx;
    103 
    104 	if (doopen != NULL && domkdir) {
    105 		errno = EINVAL;
    106 		return (0);
    107 	}
    108 
    109 	for (trv = path; *trv != '\0'; ++trv)
    110 		;
    111 	trv -= slen;
    112 	suffp = trv;
    113 	--trv;
    114 	if (trv < path) {
    115 		errno = EINVAL;
    116 		return (0);
    117 	}
    118 
    119 	/* Fill space with random characters */
    120 	while (trv >= path && *trv == 'X') {
    121 		randx = rand() % (sizeof(padchar) - 1);
    122 		*trv-- = padchar[randx];
    123 	}
    124 	start = trv + 1;
    125 
    126 	/*
    127 	 * check the target directory.
    128 	 */
    129 	if (doopen != NULL || domkdir) {
    130 		for (; trv > path; --trv) {
    131 			if (*trv == '/') {
    132 				*trv = '\0';
    133 				rval = stat(path, &sbuf);
    134 				*trv = '/';
    135 				if (rval != 0)
    136 					return (0);
    137 				if (!S_ISDIR(sbuf.st_mode)) {
    138 					errno = ENOTDIR;
    139 					return (0);
    140 				}
    141 				break;
    142 			}
    143 		}
    144 	}
    145 
    146 	for (;;) {
    147 		if (doopen) {
    148 			if ((*doopen =
    149 			    open(path, O_CREAT|O_EXCL|O_RDWR, 0600)) >= 0)
    150 				return (1);
    151 			if (errno != EEXIST)
    152 				return (0);
    153 		} else if (domkdir) {
    154 			if (mkdir(path, 0700) == 0)
    155 				return (1);
    156 			if (errno != EEXIST)
    157 				return (0);
    158 		} else if (lstat(path, &sbuf))
    159 			return (errno == ENOENT);
    160 
    161 		/* If we have a collision, cycle through the space of filenames */
    162 		for (trv = start;;) {
    163 			if (*trv == '\0' || trv == suffp)
    164 				return (0);
    165 			pad = strchr(padchar, *trv);
    166 			if (pad == NULL || *++pad == '\0')
    167 				*trv++ = padchar[0];
    168 			else {
    169 				*trv++ = *pad;
    170 				break;
    171 			}
    172 		}
    173 	}
    174 	/*NOTREACHED*/
    175 }