strtonum.c (1772B)
1 /* $OpenBSD: strtonum.c,v 1.8 2015/09/13 08:31:48 guenther 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 #include <errno.h> 21 #include <limits.h> 22 #include <stdlib.h> 23 24 #define INVALID 1 25 #define TOOSMALL 2 26 #define TOOLARGE 3 27 28 long long 29 strtonum(const char *numstr, long long minval, long long maxval, 30 const char **errstrp) 31 { 32 long long ll = 0; 33 int error = 0; 34 char *ep; 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 (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 }