mktemp.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 1989 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI" /* from S5R3 1.11 */
/* Copyright (c) 1984 AT&T */
/* All Rights Reserved */
/*LINTLIBRARY*/
/****************************************************************
* Routine expects a string of length at least 6, with
* six trailing 'X's. These will be overlaid with a
* letter and the last (5) digigts of the proccess ID.
* If every letter (a thru z) thus inserted leads to
* an existing file name, your string is shortened to
* length zero upon return (first character set to '\0').
***************************************************************/
#include <sys/types.h>
#include <sys/stat.h>
#define XCNT 6
extern int strlen(), access(), getpid();
char *
mktemp(as)
char *as;
{
register char *s=as;
register unsigned pid;
register unsigned xcnt=0; /* keeps track of number of X's seen */
struct stat buf;
pid = getpid();
s += strlen(as); /* point at the terminal null */
while(*--s == 'X' && ++xcnt <= XCNT) {
*s = (pid%10) + '0';
pid /= 10;
}
if(*++s) { /* maybe there were no 'X's */
*s = 'a';
while (stat(as, &buf) == 0) {
if(++*s > 'z') {
*as = '\0';
break;
}
}
} else
if (stat(as, &buf) == 0)
*as = '\0';
return(as);
}