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

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