diff options
Diffstat (limited to 'contrib/ntp/libntp/hextolfp.c')
-rw-r--r-- | contrib/ntp/libntp/hextolfp.c | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/contrib/ntp/libntp/hextolfp.c b/contrib/ntp/libntp/hextolfp.c new file mode 100644 index 0000000..d0b6243 --- /dev/null +++ b/contrib/ntp/libntp/hextolfp.c @@ -0,0 +1,67 @@ +/* + * hextolfp - convert an ascii hex string to an l_fp number + */ +#include <stdio.h> +#include <ctype.h> + +#include "ntp_fp.h" +#include "ntp_string.h" +#include "ntp_stdlib.h" + +int +hextolfp( + const char *str, + l_fp *lfp + ) +{ + register const char *cp; + register const char *cpstart; + register u_long dec_i; + register u_long dec_f; + char *ind = NULL; + static const char *digits = "0123456789abcdefABCDEF"; + + dec_i = dec_f = 0; + cp = str; + + /* + * We understand numbers of the form: + * + * [spaces]8_hex_digits[.]8_hex_digits[spaces|\n|\0] + */ + while (isspace((int)*cp)) + cp++; + + cpstart = cp; + while (*cp != '\0' && (cp - cpstart) < 8 && + (ind = strchr(digits, *cp)) != NULL) { + dec_i = dec_i << 4; /* multiply by 16 */ + dec_i += ((ind - digits) > 15) ? (ind - digits) - 6 + : (ind - digits); + cp++; + } + + if ((cp - cpstart) < 8 || ind == NULL) + return 0; + if (*cp == '.') + cp++; + + cpstart = cp; + while (*cp != '\0' && (cp - cpstart) < 8 && + (ind = strchr(digits, *cp)) != NULL) { + dec_f = dec_f << 4; /* multiply by 16 */ + dec_f += ((ind - digits) > 15) ? (ind - digits) - 6 + : (ind - digits); + cp++; + } + + if ((cp - cpstart) < 8 || ind == NULL) + return 0; + + if (*cp != '\0' && !isspace((int)*cp)) + return 0; + + lfp->l_ui = dec_i; + lfp->l_uf = dec_f; + return 1; +} |