43 lines
885 B
C
43 lines
885 B
C
#include <config.h>
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#include <sys/types.h>
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#include <ctype.h>
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#include "ntp_types.h"
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#include "ntp_stdlib.h"
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/*
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* atouint() - convert an ascii string representing a whole base 10
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* number to u_long *uval, returning TRUE if successful.
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* Does not modify *uval and returns FALSE if str is not
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* a positive base10 integer or is too large for a u_int32.
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* this function uses u_long but should use u_int32, and
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* probably be renamed.
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*/
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int
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atouint(
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const char *str,
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u_long *uval
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)
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{
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u_long u;
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const char *cp;
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cp = str;
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if ('\0' == *cp)
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return 0;
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u = 0;
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while ('\0' != *cp) {
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if (!isdigit((unsigned char)*cp))
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return 0;
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if (u > 429496729 || (u == 429496729 && *cp >= '6'))
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return 0; /* overflow */
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/* hand-optimized u *= 10; */
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u = (u << 3) + (u << 1);
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u += *cp++ - '0'; /* not '\0' */
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}
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*uval = u;
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return 1;
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}
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