1 /*- 2 * Copyright (c) 2004 Ted Unangst and Todd Miller 3 * All rights reserved. 4 * 5 * Permission to use, copy, modify, and distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 * 17 * $OpenBSD: strtonum.c,v 1.7 2013/04/17 18:40:58 tedu Exp $ 18 */ 19 20 #include <sys/cdefs.h> 21 __FBSDID("$FreeBSD$"); 22 23 #include <errno.h> 24 #include <limits.h> 25 #include <stdlib.h> 26 27 #define INVALID 1 28 #define TOOSMALL 2 29 #define TOOLARGE 3 30 31 long long 32 strtonum(const char *numstr, long long minval, long long maxval, 33 const char **errstrp) 34 { 35 long long ll = 0; 36 int error = 0; 37 char *ep; 38 struct errval { 39 const char *errstr; 40 int err; 41 } ev[4] = { 42 { NULL, 0 }, 43 { "invalid", EINVAL }, 44 { "too small", ERANGE }, 45 { "too large", ERANGE }, 46 }; 47 48 ev[0].err = errno; 49 errno = 0; 50 if (minval > maxval) { 51 error = INVALID; 52 } else { 53 ll = strtoll(numstr, &ep, 10); 54 if (errno == EINVAL || numstr == ep || *ep != '\0') 55 error = INVALID; 56 else if ((ll == LLONG_MIN && errno == ERANGE) || ll < minval) 57 error = TOOSMALL; 58 else if ((ll == LLONG_MAX && errno == ERANGE) || ll > maxval) 59 error = TOOLARGE; 60 } 61 if (errstrp != NULL) 62 *errstrp = ev[error].errstr; 63 errno = ev[error].err; 64 if (error) 65 ll = 0; 66 67 return (ll); 68 } 69