Ah, right. %d will produce signed output for the signed char values in
h_addr_list:
int main(int argc, char * argv[])
{
char h_addr_list[4] = { 124, 198, 140, 142 };
printf("%d.%d.%d.%d\n",
h_addr_list[0], h_addr_list[1],
h_addr_list[2], h_addr_list[3]);
printf("%d.%d.%d.%d\n",
(unsigned char)h_addr_list[0], (unsigned char)h_addr_list[1],
(unsigned char)h_addr_list[2], (unsigned char)h_addr_list[3]);
return 0;
}
$ ./test
124.-58.-116.-114
124.198.140.142
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https://bugs.launchpad.net/bugs/722386
Title:
PAM pgsql buffer overflow when dealing with long addresses
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