36 lines
575 B
C
36 lines
575 B
C
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/*
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* atouint - convert an ascii string to an unsigned long, with error checking
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*/
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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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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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register u_long u;
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register const char *cp;
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cp = str;
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if (*cp == '\0')
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return 0;
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u = 0;
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while (*cp != '\0') {
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if (!isdigit((int)*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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u = (u << 3) + (u << 1);
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u += *cp++ - '0'; /* ascii dependent */
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}
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*uval = u;
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return 1;
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}
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