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The subroutine tmp_name is designed to return the name of a temporary file. The idea is to generate a unique name each time it is called: /var/tmp/tmp.0, /var/tmp/tmp.1, /var/tmp/tmp.2, ...
The names that are generated are certainly unique, but not what the programmer intended.
1 /************************************************
2 * tmp_test -- test out the tmp_name function. *
3 ************************************************/
4 #include <iostream>
5 #include <cstdio>
6 #include <cstring>
7 #include <sys/param.h>
8 /************************************************
9 * tmp_name -- return a temporary file name *
10 * *
11 * Each time this function is called, a new *
12 * name will be returned. *
13 * *
14 * Returns: Pointer to the new file name. *
15 ************************************************/
16 char *tmp_name(void) {
17 // The name we are generating
18 char name[MAXPATHLEN];
19
20 // The base of the generated name
21 const char DIR[] = "/var/tmp/tmp";
22
23 // Sequence number for last digit
24 static int sequence = 0;
25
26 ++sequence; /* Move to the next file name */
27
28 sprintf(name, "%s.%d", DIR, sequence);
29 return(name);
30 }
31 int main() {
32 char *a_name = tmp_name(); // A tmp name
33 std::cout << "Name: " << a_name << std::endl;
34 return(o);
35 }
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