/* $NetBSD: atoint.c,v 1.1.1.1 2000/03/29 12:38:49 simonb Exp $ */ /* * atoint - convert an ascii string to a signed long, with error checking */ #include #include #include "ntp_types.h" #include "ntp_stdlib.h" int atoint( const char *str, long *ival ) { register long u; register const char *cp; register int isneg; register int oflow_digit; cp = str; if (*cp == '-') { cp++; isneg = 1; oflow_digit = '8'; } else { isneg = 0; oflow_digit = '7'; } if (*cp == '\0') return 0; u = 0; while (*cp != '\0') { if (!isdigit((int)*cp)) return 0; if (u > 214748364 || (u == 214748364 && *cp > oflow_digit)) return 0; /* overflow */ u = (u << 3) + (u << 1); u += *cp++ - '0'; /* ascii dependent */ } if (isneg) *ival = -u; else *ival = u; return 1; }