ea4298bb54
to preserve the file extension (if any) which may be used by the editor (like emacs) to choose the editing mode.
127 lines
2.7 KiB
C
127 lines
2.7 KiB
C
/*
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* Copyright (c) 2001, 2003, 2004, 2008-2010
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* Todd C. Miller <Todd.Miller@courtesan.com>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <config.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <stdio.h>
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#ifdef HAVE_STDLIB_H
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# include <stdlib.h>
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#endif /* HAVE_STDLIB_H */
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#include <ctype.h>
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#ifdef HAVE_UNISTD_H
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# include <unistd.h>
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#endif /* HAVE_UNISTD_H */
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#include <compat.h>
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static unsigned int get_random(void);
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static void seed_random(void);
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#define TEMPCHARS "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"
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#define NUM_CHARS (sizeof(TEMPCHARS) - 1)
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#ifndef INT_MAX
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#define INT_MAX 0x7fffffff
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#endif
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int
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mkstemps(char *path, int slen)
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{
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char *start, *cp, *ep;
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const char *tempchars = TEMPCHARS;
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unsigned int r, tries;
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int fd;
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for (ep = path; *ep; ep++)
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;
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if (path + slen >= ep) {
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errno = EINVAL;
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return(-1);
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}
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ep -= slen;
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tries = 1;
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for (start = ep; start > path && start[-1] == 'X'; start--) {
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if (tries < INT_MAX / NUM_CHARS)
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tries *= NUM_CHARS;
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}
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tries *= 2;
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do {
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for (cp = start; *cp; cp++) {
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r = get_random() % NUM_CHARS;
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*cp = tempchars[r];
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}
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fd = open(path, O_CREAT|O_EXCL|O_RDWR, S_IRUSR|S_IWUSR);
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if (fd != -1 || errno != EEXIST)
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return(fd);
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} while (--tries);
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errno = EEXIST;
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return(-1);
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}
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#ifdef HAVE_RANDOM
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# define RAND random
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# define SRAND srandom
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# define SEED_T unsigned int
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#else
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# ifdef HAVE_LRAND48
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# define RAND lrand48
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# define SRAND srand48
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# define SEED_T long
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# else
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# define RAND rand
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# define SRAND srand
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# define SEED_T unsigned int
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# endif
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#endif
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static void
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seed_random(void)
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{
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SEED_T seed;
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struct timeval tv;
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/*
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* Seed from time of day and process id multiplied by small primes.
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*/
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(void) gettime(&tv);
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seed = (tv.tv_sec % 10000) * 523 + tv.tv_usec * 13 +
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(getpid() % 1000) * 983;
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SRAND(seed);
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}
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static unsigned int
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get_random(void)
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{
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static int initialized;
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if (!initialized) {
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seed_random();
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initialized = 1;
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}
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return(RAND() & 0xffffffff);
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}
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