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

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