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    1: /*	$OpenBSD: strtonum.c,v 1.6 2004/08/03 19:38:01 millert Exp $	*/
    2: 
    3: /*
    4:  * Copyright (c) 2004 Ted Unangst and Todd Miller
    5:  * All rights reserved.
    6:  *
    7:  * Permission to use, copy, modify, and distribute this software for any
    8:  * purpose with or without fee is hereby granted, provided that the above
    9:  * copyright notice and this permission notice appear in all copies.
   10:  *
   11:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   12:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   13:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
   14:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   15:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   16:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   17:  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   18:  */
   19: 
   20: #include <errno.h>
   21: #include <limits.h>
   22: #include <stdlib.h>
   23: 
   24: #define INVALID 	1
   25: #define TOOSMALL 	2
   26: #define TOOLARGE 	3
   27: 
   28: /* Not defined in GLIBC */
   29: #ifndef LLONG_MAX
   30: # define LLONG_MAX 0x7fffffffffffffffLL
   31: #endif
   32: 
   33: #ifndef LLONG_MIN
   34: # define LLONG_MIN (-0x7fffffffffffffffLL-1)
   35: #endif
   36: 
   37: long long
   38: strtonum(const char *numstr, long long minval, long long maxval,
   39:     const char **errstrp)
   40: {
   41: 	long long ll = 0;
   42: 	char *ep;
   43: 	int error = 0;
   44: 	struct errval {
   45: 		const char *errstr;
   46: 		int err;
   47: 	} ev[4] = {
   48: 		{ NULL,		0 },
   49: 		{ "invalid",	EINVAL },
   50: 		{ "too small",	ERANGE },
   51: 		{ "too large",	ERANGE },
   52: 	};
   53: 
   54: 	ev[0].err = errno;
   55: 	errno = 0;
   56: 	if (minval > maxval)
   57: 		error = INVALID;
   58: 	else {
   59: 		ll = strtoll(numstr, &ep, 10);
   60: 		if (numstr == ep || *ep != '\0')
   61: 			error = INVALID;
   62: 		else if ((ll == LLONG_MIN && errno == ERANGE) || ll < minval)
   63: 			error = TOOSMALL;
   64: 		else if ((ll == LLONG_MAX && errno == ERANGE) || ll > maxval)
   65: 			error = TOOLARGE;
   66: 	}
   67: 	if (errstrp != NULL)
   68: 		*errstrp = ev[error].errstr;
   69: 	errno = ev[error].err;
   70: 	if (error)
   71: 		ll = 0;
   72: 
   73: 	return (ll);
   74: }
   75: 
   76: /**
   77:  * Local Variables:
   78:  *  version-control: t
   79:  *  c-file-style: "bsd"
   80:  * End:
   81:  */