55 lines
1.4 KiB
C
55 lines
1.4 KiB
C
#if !defined(lint) && defined(SCCSIDS)
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static char sccsid[] = "@(#)mktemp.c 1.1 92/07/30 SMI"; /* from S5R3 1.11 */
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#endif
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/* Copyright (c) 1984 AT&T */
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/* All Rights Reserved */
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/* THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF AT&T */
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/* The copyright notice above does not evidence any */
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/* actual or intended publication of such source code. */
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/*LINTLIBRARY*/
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/****************************************************************
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* Routine expects a string of length at least 6, with
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* six trailing 'X's. These will be overlaid with a
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* letter and the last (5) digigts of the proccess ID.
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* If every letter (a thru z) thus inserted leads to
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* an existing file name, your string is shortened to
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* length zero upon return (first character set to '\0').
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***************************************************************/
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#include <sys/types.h>
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#include <sys/stat.h>
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#define XCNT 6
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extern int strlen(), access(), getpid();
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char *
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mktemp(as)
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char *as;
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{
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register char *s=as;
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register unsigned pid;
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register unsigned xcnt=0; /* keeps track of number of X's seen */
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struct stat buf;
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pid = getpid();
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s += strlen(as); /* point at the terminal null */
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while(*--s == 'X' && ++xcnt <= XCNT) {
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*s = (pid%10) + '0';
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pid /= 10;
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}
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if(*++s) { /* maybe there were no 'X's */
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*s = 'a';
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while (stat(as, &buf) == 0) {
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if(++*s > 'z') {
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*as = '\0';
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break;
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}
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}
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} else
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if (stat(as, &buf) == 0)
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*as = '\0';
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return(as);
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}
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