diplodocus.org Git - nmh/blob - sbr/m_atoi.c

   1
   2 /*
   3  * m_atoi.c -- Parse a string representation of a message number, and
   4  *          -- return the numeric value of the message.  If the string
   5  *          -- contains any non-digit characters, then return 0.
   6  *
   7  * $Id$
   8  *
   9  * This code is Copyright (c) 2002, by the authors of nmh.  See the
  10  * COPYRIGHT file in the root directory of the nmh distribution for
  11  * complete copyright information.
  12  */
  13
  14 #include <h/mh.h>
  15
  16
  17 int
  18 m_atoi (char *str)
  19 {
  20     int i;
  21     char *cp;
  22
  23     for (i = 0, cp = str; *cp; cp++) {
  24 #ifdef LOCALE
  25         if (!isdigit(*cp))
  26 #else
  27         if (*cp < '0' || *cp > '9')
  28 #endif
  29             return 0;
  30
  31         i *= 10;
  32         i += (*cp - '0');
  33     }
  34
  35     return i;
  36 }