compat/strtonum.c (1873 bytes)
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 1.6 2004/08/03 19:38:01 millert Exp $ 18 */ 19 20 #include <errno.h> 21 #include <limits.h> 22 #include <stdlib.h> 23 24 #include "../compat.h" 25 26 #define INVALID 1 27 #define TOOSMALL 2 28 #define TOOLARGE 3 29 30 long long strtonum(const char *numstr, long long minval, long long maxval, 31 const char **errstrp) { 32 long long ll = 0; 33 char *ep; 34 int error = 0; 35 struct errval { 36 const char *errstr; 37 int err; 38 } ev[4] = { 39 {NULL, 0}, 40 {"invalid", EINVAL}, 41 {"too small", ERANGE}, 42 {"too large", ERANGE}, 43 }; 44 45 ev[0].err = errno; 46 errno = 0; 47 if (minval > maxval) 48 error = INVALID; 49 else { 50 ll = strtoll(numstr, &ep, 10); 51 if (errno == EINVAL || numstr == ep || *ep != '\0') 52 error = INVALID; 53 else if ((ll == LLONG_MIN && errno == ERANGE) || ll < minval) 54 error = TOOSMALL; 55 else if ((ll == LLONG_MAX && errno == ERANGE) || ll > maxval) 56 error = TOOLARGE; 57 } 58 if (errstrp != NULL) 59 *errstrp = ev[error].errstr; 60 errno = ev[error].err; 61 if (error) 62 ll = 0; 63 64 return (ll); 65 }