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/* Header: util.c,v 7.0.1.2 86/10/20 12:07:46 lwall Exp */
/* Log: util.c,v
* Revision 7.0.1.2 86/10/20 12:07:46 lwall
* Made all exits reset tty.
*
* Revision 7.0.1.1 86/10/16 10:54:02 lwall
* Added Damage. Fixed random bugs.
*
* Revision 7.0 86/10/08 15:14:31 lwall
* Split into separate files. Added amoebas and pirates.
*
*/
#include "EXTERN.h"
#include "warp.h"
#include "sys/dir.h"
#include "object.h"
#include "sig.h"
#include "term.h"
#include "INTERN.h"
#include "util.h"
struct timespec timebuf;
void
util_init(void)
{
;
}
void
movc3(int len, char *src, char *dest)
{
if (dest <= src) {
for (; len; len--) {
*dest++ = *src++;
}
}
else {
dest += len;
src += len;
for (; len; len--) {
*--dest = *--src;
}
}
}
void
no_can_do(const char *what)
{
fprintf(stderr,"Sorry, your terminal is too %s to play warp.\r\n",what);
finalize(1);
}
int
exdis(int maxnum)
{
double temp, temp2;
temp = (double) maxnum;
#ifndef lint
temp2 = (double) myrand();
#else
temp2 = 0.0;
#endif
#if RANDBITS == 15
return (int) exp(temp2 * log(temp)/0x7fff);
#else
#if RANDBITS == 16
return (int) exp(temp2 * log(temp)/0xffff);
#else
return (int) exp(temp2 * log(temp)/0x7fffffff);
#endif
#endif
}
static char nomem[] = "warp: out of memory!\r\n";
/* paranoid version of malloc */
void *
safemalloc(size_t size)
{
char *ptr;
ptr = malloc(size?size:1); /* malloc(0) is NASTY on our system */
if (ptr != NULL)
return ptr;
else {
fputs(nomem,stdout);
sig_catcher(0);
}
/*NOTREACHED*/
return NULL;
}
/* safe version of string copy */
char *
safecpy(char *to, const char *from, size_t len)
{
char *dest = to;
if (from != NULL)
for (len--; len && (*dest++ = *from++); len--)
continue;
*dest = '\0';
return to;
}
/* copy a string up to some (non-backslashed) delimiter, if any */
char *
cpytill(char *to, const char *from, int delim)
{
for (; *from; from++,to++) {
if (*from == '\\' && from[1] == delim)
from++;
else if (*from == delim)
break;
*to = *from;
}
*to = '\0';
return __UNCONST(from);
}
/* return ptr to little string in big string, NULL if not found */
char *
instr(const char *big, const char *little)
{
const char *t;
const char *s;
const char *x;
for (t = big; *t; t++) {
for (x=t,s=little; *s; x++,s++) {
if (!*x)
return NULL;
if (*s != *x)
break;
}
if (!*s)
return __UNCONST(t);
}
return NULL;
}
/* effective access */
#ifdef SETUIDGID
int
eaccess(const char *filename, mode_t mod)
{
mode_t protection;
uid_t euid;
mod &= 7; /* remove extraneous garbage */
if (stat(filename, &filestat) < 0)
return -1;
euid = geteuid();
if (euid == ROOTID)
return 0;
protection = 7 & (filestat.st_mode >>
(filestat.st_uid == euid ? 6 :
(filestat.st_gid == getegid() ? 3 : 0)
));
if ((mod & protection) == mod)
return 0;
errno = EACCES;
return -1;
}
#endif
void
prexit(const char *cp)
{
write(2, cp, strlen(cp));
sig_catcher(0);
}
/* copy a string to a safe spot */
char *
savestr(const char *str)
{
char *newaddr = safemalloc((size_t)(strlen(str)+1));
strcpy(newaddr, str);
return newaddr;
}
char *
getval(const char *nam, const char *def)
{
const char *val;
if ((val = getenv(nam)) == NULL || !*val)
val = def;
return __UNCONST(val);
}
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