strtonum.h

   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 /* https://git.datadissipation.net */
  19 #ifndef STRTONUM_H_
  20  #define STRTONUM_H_            1
  21
  22  #ifdef STRTONUM_INCLUDE_LIBC
  23   #include <errno.h>
  24   #include <limits.h>
  25   #include <stdlib.h>
  26  #endif /* STRTONUM_INCLUDE_LIBC */
  27
  28  #ifndef HAVE_STRTONUM
  29  #define strtonum               i_strtonum_
  30 long long i_strtonum_(const char *numstr, long long minval, long long maxval,
  31                       const char **errstrp);
  32  #endif /* !HAVE_STRTONUM */
  33
  34  #ifdef STRTONUM_IMPLEMENTATION
  35   #define       I_INVALID_      1
  36   #define       I_TOOSMALL_     2
  37   #define       I_TOOLARGE      3
  38
  39 long long
  40 i_strtonum_(const char *numstr, long long minval, long long maxval,
  41             const char **errstrp)
  42 {
  43         long long ll = 0;
  44         int error = 0;
  45         char *ep;
  46         struct errval {
  47                 const char *errstr;
  48                 int err;
  49         } ev[4] = {
  50                 { NULL,         0 },
  51                 { "invalid",    EINVAL },
  52                 { "too small",  ERANGE },
  53                 { "too large",  ERANGE },
  54         };
  55
  56         ev[0].err = errno;
  57         errno = 0;
  58         if (minval > maxval) {
  59                 error = I_INVALID_;
  60         } else {
  61                 ll = strtoll(numstr, &ep, 10);
  62                 if (numstr == ep || *ep != '\0')
  63                         error = I_INVALID_;
  64                 else if ((ll == LLONG_MIN && errno == ERANGE) || ll < minval)
  65                         error = I_TOOSMALL_;
  66                 else if ((ll == LLONG_MAX && errno == ERANGE) || ll > maxval)
  67                         error = I_TOOLARGE;
  68         }
  69         if (errstrp != NULL)
  70                 *errstrp = ev[error].errstr;
  71         errno = ev[error].err;
  72         if (error)
  73                 ll = 0;
  74
  75         return (ll);
  76 }
  77  #endif /* STRTONUM_IMPLEMENTATION */
  78 #endif /* !STRTONUM_H_ */