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Annotation of src/lib/libc/stdio/mktemp.c, Revision 1.5.2.1

1.5.2.1 ! jtc         1: /*     $NetBSD: mktemp.c,v 1.5 1995/02/02 02:10:09 jtc Exp $   */
1.5       jtc         2:
1.1       cgd         3: /*
1.5       jtc         4:  * Copyright (c) 1987, 1993
                      5:  *     The Regents of the University of California.  All rights reserved.
1.1       cgd         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. All advertising materials mentioning features or use of this software
                     16:  *    must display the following acknowledgement:
                     17:  *     This product includes software developed by the University of
                     18:  *     California, Berkeley and its contributors.
                     19:  * 4. Neither the name of the University nor the names of its contributors
                     20:  *    may be used to endorse or promote products derived from this software
                     21:  *    without specific prior written permission.
                     22:  *
                     23:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     24:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     25:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     26:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     27:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     28:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     29:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     30:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     31:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     32:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     33:  * SUCH DAMAGE.
                     34:  */
                     35:
                     36: #if defined(LIBC_SCCS) && !defined(lint)
1.5       jtc        37: #if 0
                     38: static char sccsid[] = "@(#)mktemp.c   8.1 (Berkeley) 6/4/93";
                     39: #endif
1.5.2.1 ! jtc        40: static char rcsid[] = "$NetBSD: mktemp.c,v 1.5 1995/02/02 02:10:09 jtc Exp $";
1.1       cgd        41: #endif /* LIBC_SCCS and not lint */
                     42:
1.5.2.1 ! jtc        43: #include "namespace.h"
1.1       cgd        44: #include <sys/types.h>
                     45: #include <sys/stat.h>
                     46: #include <fcntl.h>
                     47: #include <errno.h>
                     48: #include <stdio.h>
1.4       jtc        49: #include <ctype.h>
                     50: #include <unistd.h>
1.1       cgd        51:
                     52: static int _gettemp();
                     53:
1.4       jtc        54: int
1.1       cgd        55: mkstemp(path)
                     56:        char *path;
                     57: {
                     58:        int fd;
                     59:
                     60:        return (_gettemp(path, &fd) ? fd : -1);
                     61: }
                     62:
                     63: char *
                     64: mktemp(path)
                     65:        char *path;
                     66: {
                     67:        return(_gettemp(path, (int *)NULL) ? path : (char *)NULL);
                     68: }
                     69:
1.4       jtc        70: static int
1.1       cgd        71: _gettemp(path, doopen)
                     72:        char *path;
                     73:        register int *doopen;
                     74: {
                     75:        extern int errno;
                     76:        register char *start, *trv;
                     77:        struct stat sbuf;
                     78:        u_int pid;
                     79:
                     80:        pid = getpid();
                     81:        for (trv = path; *trv; ++trv);          /* extra X's get set to 0's */
                     82:        while (*--trv == 'X') {
                     83:                *trv = (pid % 10) + '0';
                     84:                pid /= 10;
                     85:        }
                     86:
                     87:        /*
                     88:         * check the target directory; if you have six X's and it
                     89:         * doesn't exist this runs for a *very* long time.
                     90:         */
                     91:        for (start = trv + 1;; --trv) {
                     92:                if (trv <= path)
                     93:                        break;
                     94:                if (*trv == '/') {
                     95:                        *trv = '\0';
                     96:                        if (stat(path, &sbuf))
                     97:                                return(0);
                     98:                        if (!S_ISDIR(sbuf.st_mode)) {
                     99:                                errno = ENOTDIR;
                    100:                                return(0);
                    101:                        }
                    102:                        *trv = '/';
                    103:                        break;
                    104:                }
                    105:        }
                    106:
                    107:        for (;;) {
                    108:                if (doopen) {
                    109:                        if ((*doopen =
                    110:                            open(path, O_CREAT|O_EXCL|O_RDWR, 0600)) >= 0)
                    111:                                return(1);
                    112:                        if (errno != EEXIST)
                    113:                                return(0);
                    114:                }
                    115:                else if (stat(path, &sbuf))
                    116:                        return(errno == ENOENT ? 1 : 0);
                    117:
                    118:                /* tricky little algorithm for backward compatibility */
                    119:                for (trv = start;;) {
                    120:                        if (!*trv)
                    121:                                return(0);
                    122:                        if (*trv == 'z')
                    123:                                *trv++ = 'a';
                    124:                        else {
                    125:                                if (isdigit(*trv))
                    126:                                        *trv = 'a';
                    127:                                else
                    128:                                        ++*trv;
                    129:                                break;
                    130:                        }
                    131:                }
                    132:        }
                    133:        /*NOTREACHED*/
                    134: }