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Annotation of 43BSDTahoe/lib/libc/gen/mktemp.c, revision 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: }

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