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34 lines
719 B
34 lines
719 B
#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <errno.h>
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#include <time.h>
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#include <stdint.h>
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#include "libc.h"
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char *__mktemp(char *template)
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{
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struct timespec ts;
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size_t l = strlen(template);
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int retries = 10000;
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unsigned long r;
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if (l < 6 || strcmp(template+l-6, "XXXXXX")) {
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errno = EINVAL;
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return 0;
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}
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clock_gettime(CLOCK_REALTIME, &ts);
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r = ts.tv_nsec + (uintptr_t)&ts / 16 + (uintptr_t)template;
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while (retries--) {
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snprintf(template+l-6, 7, "%06lX", r & 0xffffff);
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if (access(template, F_OK) < 0) return template;
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r = r * 1103515245 + 12345;
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}
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*template = 0;
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errno = EEXIST;
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return template;
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}
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weak_alias(__mktemp, mktemp);
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