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#include "libbb.h"
#define URANDOM_DEV "/dev/urandom"
static char hex_chars[]= "0123456789abcdef";
char *atlas_name_macro(char *str)
{
unsigned char c;
int i, fd;
size_t len;
char *p, *in, *out;
char buf[256];
unsigned char random_buf[8];
p= strchr(str, '$');
if (p == NULL)
return strdup(str);
in= str;
out= buf;
while (*in)
{
p= strchr(in, '$');
if (p == NULL)
{
strlcpy(out, in, buf+sizeof(buf)-out);
break;
}
if (p != in)
{
len= p-in;
if (len+1 > buf+sizeof(buf)-out)
return NULL;
memcpy(out, in, len);
out[len]= '\0';
out += len;
}
switch(p[1])
{
case 'p':
snprintf(out, buf+sizeof(buf)-out, "%d",
get_probe_id());
break;
case 't':
snprintf(out, buf+sizeof(buf)-out, "%ld",
(long)time(NULL));
break;
case 'r':
/* We need to hex digits per byte in random_buf */
if (sizeof(random_buf)*2+1 > buf+sizeof(buf)-out)
return NULL;
fd= open(URANDOM_DEV, O_RDONLY);
/* Best effort, just ignore errors */
if (fd != -1)
{
read(fd, random_buf, sizeof(random_buf));
close(fd);
}
for (i= 0; i<sizeof(random_buf); i++)
{
c= random_buf[i];
out[0]= hex_chars[(c >> 4) & 0xf];
out[1]= hex_chars[c & 0xf];
out += 2;
}
out[0]= '\0';
break;
default:
return NULL;
}
in= p+2;
out += strlen(out);
}
return strdup(buf);
}
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