Return to mktemp.c CVS log

Up to [CSRG BSD Unix] / 43BSDTahoe / lib / libc / gen

Annotation of 43BSDTahoe/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 the above copyright notice and this paragraph are
                      7:  * duplicated in all such forms and that any documentation,
                      8:  * advertising materials, and other materials related to such
                      9:  * distribution and use acknowledge that the software was developed
                     10:  * by the University of California, Berkeley.  The name of the
                     11:  * University may not be used to endorse or promote products derived
                     12:  * from this software without specific prior written permission.
                     13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
                     14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
                     15:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     16:  */
                     17: 
                     18: #if defined(LIBC_SCCS) && !defined(lint)
                     19: static char sccsid[] = "@(#)mktemp.c   5.7 (Berkeley) 6/27/88";
                     20: #endif /* LIBC_SCCS and not lint */
                     21: 
                     22: #include <sys/types.h>
                     23: #include <sys/file.h>
                     24: #include <sys/stat.h>
                     25: #include <errno.h>
                     26: #include <stdio.h>
                     27: #include <ctype.h>
                     28: 
                     29: #define        YES     1
                     30: #define        NO      0
                     31: 
                     32: mkstemp(as)
                     33:        char    *as;
                     34: {
                     35:        int     fd;
                     36: 
                     37:        return (_gettemp(as, &fd) ? fd : -1);
                     38: }
                     39: 
                     40: char *
                     41: mktemp(as)
                     42:        char    *as;
                     43: {
                     44:        return(_gettemp(as, (int *)NULL) ? as : (char *)NULL);
                     45: }
                     46: 
                     47: static
                     48: _gettemp(as, doopen)
                     49:        char    *as;
                     50:        register int    *doopen;
                     51: {
                     52:        extern int      errno;
                     53:        register char   *start, *trv;
                     54:        struct stat     sbuf;
                     55:        u_int   pid;
                     56: 
                     57:        pid = getpid();
                     58: 
                     59:        /* extra X's get set to 0's */
                     60:        for (trv = as; *trv; ++trv);
                     61:        while (*--trv == 'X') {
                     62:                *trv = (pid % 10) + '0';
                     63:                pid /= 10;
                     64:        }
                     65: 
                     66:        /*
                     67:         * check for write permission on target directory; if you have
                     68:         * six X's and you can't write the directory, this will run for
                     69:         * a *very* long time.
                     70:         */
                     71:        for (start = ++trv; trv > as && *trv != '/'; --trv);
                     72:        if (*trv == '/') {
                     73:                *trv = '\0';
                     74:                if (stat(as, &sbuf) || !(sbuf.st_mode & S_IFDIR))
                     75:                        return(NO);
                     76:                *trv = '/';
                     77:        }
                     78:        else if (stat(".", &sbuf) == -1)
                     79:                return(NO);
                     80: 
                     81:        for (;;) {
                     82:                if (doopen) {
                     83:                    if ((*doopen = open(as, O_CREAT|O_EXCL|O_RDWR, 0600)) >= 0)
                     84:                        return(YES);
                     85:                    if (errno != EEXIST)
                     86:                        return(NO);
                     87:                }
                     88:                else if (stat(as, &sbuf))
                     89:                        return(errno == ENOENT ? YES : NO);
                     90: 
                     91:                /* tricky little algorithm for backward compatibility */
                     92:                for (trv = start;;) {
                     93:                        if (!*trv)
                     94:                                return(NO);
                     95:                        if (*trv == 'z')
                     96:                                *trv++ = 'a';
                     97:                        else {
                     98:                                if (isdigit(*trv))
                     99:                                        *trv = 'a';
                    100:                                else
                    101:                                        ++*trv;
                    102:                                break;
                    103:                        }
                    104:                }
                    105:        }
                    106:        /*NOTREACHED*/
                    107: }

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.