154359Sroberto/* 254359Sroberto * atoint - convert an ascii string to a signed long, with error checking 354359Sroberto */ 454359Sroberto#include <sys/types.h> 554359Sroberto#include <ctype.h> 654359Sroberto 754359Sroberto#include "ntp_types.h" 854359Sroberto#include "ntp_stdlib.h" 954359Sroberto 1054359Srobertoint 1154359Srobertoatoint( 1254359Sroberto const char *str, 1354359Sroberto long *ival 1454359Sroberto ) 1554359Sroberto{ 1654359Sroberto register long u; 1754359Sroberto register const char *cp; 1854359Sroberto register int isneg; 1954359Sroberto register int oflow_digit; 2054359Sroberto 2154359Sroberto cp = str; 2254359Sroberto 2354359Sroberto if (*cp == '-') { 2454359Sroberto cp++; 2554359Sroberto isneg = 1; 2654359Sroberto oflow_digit = '8'; 2754359Sroberto } else { 2854359Sroberto isneg = 0; 2954359Sroberto oflow_digit = '7'; 3054359Sroberto } 3154359Sroberto 3254359Sroberto if (*cp == '\0') 3354359Sroberto return 0; 3454359Sroberto 3554359Sroberto u = 0; 3654359Sroberto while (*cp != '\0') { 3754359Sroberto if (!isdigit((int)*cp)) 3854359Sroberto return 0; 3954359Sroberto if (u > 214748364 || (u == 214748364 && *cp > oflow_digit)) 4054359Sroberto return 0; /* overflow */ 4154359Sroberto u = (u << 3) + (u << 1); 4254359Sroberto u += *cp++ - '0'; /* ascii dependent */ 4354359Sroberto } 4454359Sroberto 4554359Sroberto if (isneg) 4654359Sroberto *ival = -u; 4754359Sroberto else 4854359Sroberto *ival = u; 4954359Sroberto return 1; 5054359Sroberto} 51