strtonum.c (1814B)
1 /* Note: Taken from OpenBSD: 2 * $OpenBSD: strtonum.c,v 1.8 2015/09/13 08:31:48 guenther Exp $ 3 */ 4 5 /* 6 * Copyright (c) 2004 Ted Unangst and Todd Miller 7 * All rights reserved. 8 * 9 * Permission to use, copy, modify, and/or distribute this software for any 10 * purpose with or without fee is hereby granted, provided that the above 11 * copyright notice and this permission notice appear in all copies. 12 * 13 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 14 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 15 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 16 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 17 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 18 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 19 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 20 */ 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 long long 31 ltk_strtonum( 32 const char *numstr, long long minval, 33 long long maxval, const char **errstrp) { 34 long long ll = 0; 35 int error = 0; 36 char *ep; 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 return (ll); 67 }