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