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