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Annotation of prex-old/usr/lib/libc/stdio/mktemp.c, Revision 1.1.1.1

1.1       nbrk        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. 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: #include <sys/types.h>
                     31: #include <sys/stat.h>
                     32: #include <fcntl.h>
                     33: #include <errno.h>
                     34: #include <stdio.h>
                     35: #include <ctype.h>
                     36: #include <unistd.h>
                     37:
                     38: static int _gettemp(char *, int *);
                     39:
                     40: int
                     41: mkstemp(path)
                     42:        char *path;
                     43: {
                     44:        int fd;
                     45:
                     46:        return (_gettemp(path, &fd) ? fd : -1);
                     47: }
                     48:
                     49: char *
                     50: mktemp(path)
                     51:        char *path;
                     52: {
                     53:        return(_gettemp(path, (int *)NULL) ? path : (char *)NULL);
                     54: }
                     55:
                     56: static int
                     57: _gettemp(path, doopen)
                     58:        char *path;
                     59:        int *doopen;
                     60: {
                     61:        extern int errno;
                     62:        char *start, *trv;
                     63:        struct stat sbuf;
                     64:        u_int pid;
                     65:
                     66:        pid = getpid();
                     67:        for (trv = path; *trv; ++trv);          /* extra X's get set to 0's */
                     68:        while (*--trv == 'X') {
                     69:                *trv = (pid % 10) + '0';
                     70:                pid /= 10;
                     71:        }
                     72:
                     73:        /*
                     74:         * check the target directory; if you have six X's and it
                     75:         * doesn't exist this runs for a *very* long time.
                     76:         */
                     77:        for (start = trv + 1;; --trv) {
                     78:                if (trv <= path)
                     79:                        break;
                     80:                if (*trv == '/') {
                     81:                        *trv = '\0';
                     82:                        if (stat(path, &sbuf))
                     83:                                return(0);
                     84:                        if (!S_ISDIR(sbuf.st_mode)) {
                     85:                                errno = ENOTDIR;
                     86:                                return(0);
                     87:                        }
                     88:                        *trv = '/';
                     89:                        break;
                     90:                }
                     91:        }
                     92:
                     93:        for (;;) {
                     94:                if (doopen) {
                     95:                        if ((*doopen =
                     96:                            open(path, O_CREAT|O_EXCL|O_RDWR, 0600)) >= 0)
                     97:                                return(1);
                     98:                        if (errno != EEXIST)
                     99:                                return(0);
                    100:                }
                    101:                else if (stat(path, &sbuf))
                    102:                        return(errno == ENOENT ? 1 : 0);
                    103:
                    104:                /* tricky little algorithm for backward compatibility */
                    105:                for (trv = start;;) {
                    106:                        if (!*trv)
                    107:                                return(0);
                    108:                        if (*trv == 'z')
                    109:                                *trv++ = 'a';
                    110:                        else {
                    111:                                if (isdigit((unsigned char)*trv))
                    112:                                        *trv = 'a';
                    113:                                else
                    114:                                        ++*trv;
                    115:                                break;
                    116:                        }
                    117:                }
                    118:        }
                    119:        /*NOTREACHED*/
                    120: }