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Annotation of 43BSDReno/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: (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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