Plan 9 from Bell Labs’s /usr/web/sources/contrib/rsc/linuxemu/libc/port/mktemp.c

Copyright © 2021 Plan 9 Foundation.
Distributed under the MIT License.
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#include <u.h>
#include <libc.h>

char*
mktemp(char *as)
{
	char *s;
	unsigned pid;
	int i;
	char err[ERRLEN];

	pid = getpid();
	s = as;
	while(*s++)
		;
	s--;
	while(*--s == 'X') {
		*s = pid % 10 + '0';
		pid = pid/10;
	}
	s++;
	i = 'a';
	while(access(as, 0) != -1) {
		if (i == 'z')
			return "/";
		*s = i++;
	}
	err[0] = 0;
	errstr(err);	/* clear the error */
	return as;
}

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