1 /* $DragonFly: src/lib/libc/stdlib/strtonum.c,v 1.2 2006/09/28 17:20:45 corecode Exp $ */ 2 /* $OpenBSD: strtonum.c,v 1.6 2004/08/03 19:38:01 millert Exp $ */ 3 4 /* 5 * Copyright (c) 2004 Ted Unangst and Todd Miller 6 * All rights reserved. 7 * 8 * Permission to use, copy, modify, and distribute this software for any 9 * purpose with or without fee is hereby granted, provided that the above 10 * copyright notice and this permission notice appear in all copies. 11 * 12 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 13 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 14 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 15 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 16 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 17 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 18 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 19 */ 20 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 char *ep; 35 int error = 0; 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 (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