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Annotation of 43BSDReno/lib/libc/gen/mktemp.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1987 Regents of the University of California.
                      3:  * All rights reserved.
                      4:  *
                      5:  * Redistribution and use in source and binary forms are permitted
                      6:  * provided that: (1) source distributions retain this entire copyright
                      7:  * notice and comment, and (2) distributions including binaries display
                      8:  * the following acknowledgement:  ``This product includes software
                      9:  * developed by the University of California, Berkeley and its contributors''
                     10:  * in the documentation or other materials provided with the distribution
                     11:  * and in all advertising materials mentioning features or use of this
                     12:  * software. Neither the name of the University nor the names of its
                     13:  * contributors may be used to endorse or promote products derived
                     14:  * from this software without specific prior written permission.
                     15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
                     16:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
                     17:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     18:  */
                     19: 
                     20: #if defined(LIBC_SCCS) && !defined(lint)
                     21: static char sccsid[] = "@(#)mktemp.c   5.9 (Berkeley) 6/1/90";
                     22: #endif /* LIBC_SCCS and not lint */
                     23: 
                     24: #include <sys/types.h>
                     25: #include <sys/file.h>
                     26: #include <sys/stat.h>
                     27: #include <errno.h>
                     28: #include <stdio.h>
                     29: #include <ctype.h>
                     30: 
                     31: mkstemp(path)
                     32:        char *path;
                     33: {
                     34:        int fd;
                     35: 
                     36:        return (_gettemp(path, &fd) ? fd : -1);
                     37: }
                     38: 
                     39: char *
                     40: mktemp(path)
                     41:        char *path;
                     42: {
                     43:        return(_gettemp(path, (int *)NULL) ? path : (char *)NULL);
                     44: }
                     45: 
                     46: static
                     47: _gettemp(path, doopen)
                     48:        char *path;
                     49:        register int *doopen;
                     50: {
                     51:        extern int errno;
                     52:        register char *start, *trv;
                     53:        struct stat sbuf;
                     54:        u_int pid;
                     55: 
                     56:        pid = getpid();
                     57:        for (trv = path; *trv; ++trv);          /* extra X's get set to 0's */
                     58:        while (*--trv == 'X') {
                     59:                *trv = (pid % 10) + '0';
                     60:                pid /= 10;
                     61:        }
                     62: 
                     63:        /*
                     64:         * check the target directory; if you have six X's and it
                     65:         * doesn't exist this runs for a *very* long time.
                     66:         */
                     67:        for (start = trv + 1;; --trv) {
                     68:                if (trv <= path)
                     69:                        break;
                     70:                if (*trv == '/') {
                     71:                        *trv = '\0';
                     72:                        if (stat(path, &sbuf))
                     73:                                return(0);
                     74:                        if (!S_ISDIR(sbuf.st_mode)) {
                     75:                                errno = ENOTDIR;
                     76:                                return(0);
                     77:                        }
                     78:                        *trv = '/';
                     79:                        break;
                     80:                }
                     81:        }
                     82: 
                     83:        for (;;) {
                     84:                if (doopen) {
                     85:                        if ((*doopen =
                     86:                            open(path, O_CREAT|O_EXCL|O_RDWR, 0600)) >= 0)
                     87:                                return(1);
                     88:                        if (errno != EEXIST)
                     89:                                return(0);
                     90:                }
                     91:                else if (stat(path, &sbuf))
                     92:                        return(errno == ENOENT ? 1 : 0);
                     93: 
                     94:                /* tricky little algorithm for backward compatibility */
                     95:                for (trv = start;;) {
                     96:                        if (!*trv)
                     97:                                return(0);
                     98:                        if (*trv == 'z')
                     99:                                *trv++ = 'a';
                    100:                        else {
                    101:                                if (isdigit(*trv))
                    102:                                        *trv = 'a';
                    103:                                else
                    104:                                        ++*trv;
                    105:                                break;
                    106:                        }
                    107:                }
                    108:        }
                    109:        /*NOTREACHED*/
                    110: }

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