strtonum.c (1792B)
1 /* $OpenBSD: strtonum.c,v 1.7 2013/04/17 18:40:58 tedu 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 #include "util.h" 25 26 #define INVALID 1 27 #define TOOSMALL 2 28 #define TOOLARGE 3 29 30 long long 31 strtonum(const char *numstr, long long minval, long long maxval, 32 const char **errstrp) 33 { 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 }