68 lines
1.3 KiB
C
68 lines
1.3 KiB
C
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/*
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* hextolfp - convert an ascii hex string to an l_fp number
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*/
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#include <stdio.h>
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#include <ctype.h>
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#include "ntp_fp.h"
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#include "ntp_string.h"
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#include "ntp_stdlib.h"
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int
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hextolfp(
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const char *str,
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l_fp *lfp
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)
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{
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register const char *cp;
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register const char *cpstart;
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register u_long dec_i;
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register u_long dec_f;
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char *ind = NULL;
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static const char *digits = "0123456789abcdefABCDEF";
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dec_i = dec_f = 0;
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cp = str;
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/*
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* We understand numbers of the form:
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*
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* [spaces]8_hex_digits[.]8_hex_digits[spaces|\n|\0]
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*/
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while (isspace((int)*cp))
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cp++;
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cpstart = cp;
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while (*cp != '\0' && (cp - cpstart) < 8 &&
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(ind = strchr(digits, *cp)) != NULL) {
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dec_i = dec_i << 4; /* multiply by 16 */
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dec_i += ((ind - digits) > 15) ? (ind - digits) - 6
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: (ind - digits);
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cp++;
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}
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if ((cp - cpstart) < 8 || ind == NULL)
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return 0;
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if (*cp == '.')
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cp++;
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cpstart = cp;
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while (*cp != '\0' && (cp - cpstart) < 8 &&
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(ind = strchr(digits, *cp)) != NULL) {
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dec_f = dec_f << 4; /* multiply by 16 */
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dec_f += ((ind - digits) > 15) ? (ind - digits) - 6
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: (ind - digits);
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cp++;
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}
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if ((cp - cpstart) < 8 || ind == NULL)
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return 0;
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if (*cp != '\0' && !isspace((int)*cp))
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return 0;
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lfp->l_ui = dec_i;
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lfp->l_uf = dec_f;
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return 1;
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}
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