149 lines
2.4 KiB
C
149 lines
2.4 KiB
C
/** $MirBSD: src/bin/ksh/missing.c,v 2.6 2004/12/31 19:37:03 tg Exp $ */
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/* $OpenBSD: missing.c,v 1.5 2003/05/16 18:49:46 jsyn Exp $ */
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/*
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* Routines which may be missing on some machines
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*/
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#include "sh.h"
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#include "ksh_stat.h"
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__RCSID("$MirBSD: src/bin/ksh/missing.c,v 2.6 2004/12/31 19:37:03 tg Exp $");
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#ifndef HAVE_STRERROR
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char *
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strerror(err)
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int err;
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{
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static char buf[64];
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switch (err) {
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case EINVAL:
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return "Invalid argument";
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case EACCES:
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return "Permission denied";
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case ESRCH:
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return "No such process";
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case EPERM:
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return "Not owner";
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case ENOENT:
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return "No such file or directory";
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case ENOTDIR:
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return "Not a directory";
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case ENOEXEC:
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return "Exec format error";
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case ENOMEM:
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return "Not enough memory";
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case E2BIG:
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return "Argument list too long";
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default:
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shf_snprintf(buf, sizeof(buf), "Unknown system error %d", err);
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return buf;
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}
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}
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#endif /* !HAVE_STRERROR */
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#ifdef OPENDIR_DOES_NONDIR
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/* Prevent opendir() from attempting to open non-directories. Such
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* behavior can cause problems if it attempts to open special devices...
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*/
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DIR *
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ksh_opendir(d)
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const char *d;
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{
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struct stat statb;
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if (stat(d, &statb) != 0)
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return NULL;
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if (!S_ISDIR(statb.st_mode)) {
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errno = ENOTDIR;
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return NULL;
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}
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return opendir(d);
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}
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#endif /* OPENDIR_DOES_NONDIR */
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#ifndef HAVE_DUP2
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int
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dup2(oldd, newd)
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int oldd;
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int newd;
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{
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int old_errno;
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if (fcntl(oldd, F_GETFL, 0) == -1)
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return -1; /* errno == EBADF */
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if (oldd == newd)
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return newd;
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old_errno = errno;
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close(newd); /* in case its open */
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errno = old_errno;
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return fcntl(oldd, F_DUPFD, newd);
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}
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#endif /* !HAVE_DUP2 */
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/*
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* Random functions
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*/
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#ifndef HAVE_SRANDOM
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#undef HAVE_RANDOM
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#endif
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int rnd_state;
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void
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rnd_seed(long newval)
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{
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rnd_put(newval);
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rnd_state = 0;
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}
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long
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rnd_get(void)
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{
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#ifdef HAVE_ARC4RANDOM
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if (!rnd_state)
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return arc4random() & 0x7FFF;
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#endif
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#ifdef HAVE_RANDOM
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return random() & 0x7FFF;
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#else
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return rand();
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#endif
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}
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void
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rnd_put(long newval)
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{
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long sv;
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rnd_state = 1 | rnd_get();
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sv = (rnd_get() << (newval & 7)) ^ newval;
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#if defined(HAVE_ARC4RANDOM_PUSH)
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arc4random_push(sv);
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#elif defined(HAVE_ARC4RANDOM_ADDRANDOM)
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arc4random_addrandom((char *)&sv, sizeof(sv));
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#endif
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#ifdef HAVE_ARC4RANDOM
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sv ^= arc4random();
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#endif
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#ifdef HAVE_RANDOM
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srandom(sv);
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#else
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srand(sv);
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#endif
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while (rnd_state) {
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rnd_get();
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rnd_state >>= 1;
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}
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rnd_state = 1;
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}
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