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 #pragma ident "%Z%%M% %I% %E% SMI" 21 22 #include <errno.h> 23 #include <limits.h> 24 #include <stdlib.h> 25 26 #define INVALID 1 27 #define TOOSMALL 2 28 #define TOOLARGE 3 29 30 unsigned int 31 strtonum(const char *numstr, unsigned int minval, unsigned int maxval, 32 const char **errstrp) 33 { 34 long long ll = 0; 35 char *ep; 36 int error = 0; 37 struct errval { 38 const char *errstr; 39 int err; 40 } ev[4] = { 41 { NULL, 0 }, 42 { "invalid", EINVAL }, 43 { "too small", ERANGE }, 44 { "too large", ERANGE }, 45 }; 46 47 ev[0].err = errno; 48 errno = 0; 49 if (minval > maxval) 50 error = INVALID; 51 else { 52 ll = strtoll(numstr, &ep, 10); 53 if (numstr == ep || *ep != '\0') 54 error = INVALID; 55 else if ((ll == LLONG_MIN && errno == ERANGE) || ll < minval) 56 error = TOOSMALL; 57 else if ((ll == LLONG_MAX && errno == ERANGE) || ll > maxval) 58 error = TOOLARGE; 59 } 60 if (errstrp != NULL) 61 *errstrp = ev[error].errstr; 62 errno = ev[error].err; 63 if (error) 64 ll = 0; 65 66 /* 67 * we have already checked boundaries above so we can safely 68 * convert return type here 69 */ 70 return ((unsigned int)ll); 71 } 72