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 #ifndef FSTACK 22 __FBSDID("$FreeBSD$"); 23 #endif 24 25 #include <errno.h> 26 #include <limits.h> 27 #include <stdlib.h> 28 29 #include "compat.h" 30 31 #define INVALID 1 32 #define TOOSMALL 2 33 #define TOOLARGE 3 34 35 long long 36 strtonum(const char *numstr, long long minval, long long maxval, 37 const char **errstrp) 38 { 39 long long ll = 0; 40 int error = 0; 41 char *ep; 42 struct errval { 43 const char *errstr; 44 int err; 45 } ev[4] = { 46 { NULL, 0 }, 47 { "invalid", EINVAL }, 48 { "too small", ERANGE }, 49 { "too large", ERANGE }, 50 }; 51 52 ev[0].err = errno; 53 errno = 0; 54 if (minval > maxval) { 55 error = INVALID; 56 } else { 57 ll = strtoll(numstr, &ep, 10); 58 if (errno == EINVAL || numstr == ep || *ep != '\0') 59 error = INVALID; 60 else if ((ll == LLONG_MIN && errno == ERANGE) || ll < minval) 61 error = TOOSMALL; 62 else if ((ll == LLONG_MAX && errno == ERANGE) || ll > maxval) 63 error = TOOLARGE; 64 } 65 if (errstrp != NULL) 66 *errstrp = ev[error].errstr; 67 errno = ev[error].err; 68 if (error) 69 ll = 0; 70 71 return (ll); 72 } 73