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  * This code is Copyright (c) 2002, by the authors of nmh.  See the
   8  * COPYRIGHT file in the root directory of the nmh distribution for
   9  * complete copyright information.
  10  */
  11
  12 #include <h/mh.h>
  13
  14
  15 int
  16 m_atoi (char *str)
  17 {
  18     int i;
  19     unsigned char *cp;
  20
  21     for (i = 0, cp = str; *cp; cp++) {
  22 #ifdef LOCALE
  23         if (!isdigit(*cp))
  24 #else
  25         if (*cp < '0' || *cp > '9')
  26 #endif
  27             return 0;
  28
  29         i *= 10;
  30         i += (*cp - '0');
  31     }
  32
  33     return i;
  34 }