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#include "util.h"
void*
checkp(void *p)
{
if (!p) die("pointer assertion failed, OOM?\n");
return p;
}
void*
die(const char *fmtstr, ...)
{
va_list ap;
va_start(ap, fmtstr);
vfprintf(stderr, fmtstr, ap);
va_end(ap);
exit(EXIT_FAILURE);
}
char*
aprintf(const char *fmtstr, ...)
{
va_list ap, cpy;
size_t nb;
char *str;
va_copy(cpy, ap);
va_start(cpy, fmtstr);
nb = vsnprintf(NULL, 0, fmtstr, ap);
va_end(cpy);
if (nb <= 0) die("encountered invalid fmtstr!\n");
str = checkp(malloc(nb));
va_start(ap, fmtstr);
nb = vsnprintf(str, nb, fmtstr, ap);
va_end(ap);
return str;
}
const char*
mhash(const char *filename, int len)
{
static const char *hexalph = "0123456789ABCDEF";
static char buf[MHASHLEN + 1];
int i, k;
if (len == -1) len = strlen(filename);
for (i = 0; i < MIN(MHASHLEN, len); i++) {
unsigned char v = 0;
for (k = i; k < len; k += MHASHLEN)
v ^= filename[k];
buf[i*2+0] = hexalph[(v >> 0) & 0x0f];
buf[i*2+1] = hexalph[(v >> 4) & 0x0f];
}
if (i == 0) {
memset(buf, '0', MHASHLEN);
} else if (i < MHASHLEN) {
for (k = 0; k < MHASHLEN; k++)
buf[k] = buf[k % i];
}
buf[MHASHLEN] = '\0';
return buf;
}
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