FreeCalypso > hg > freecalypso-tools

annotate target-utils/libcommon/hexarg.c @ 305:3d79116be312

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doc/Compal-calibration: fc-readcal failed approach documented
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 20 Nov 2017 17:51:23 +0000
parents e7502631a0f9
children
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1 /*
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2 * Many commands take hex arguments. This module contains the parse_hexarg()
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3 * function, which is a wrapper around strtoul that performs some additional
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4 * checks.
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5 */
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6
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7 #include <sys/types.h>
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8 #include <ctype.h>
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9 #include <stdlib.h>
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11 parse_hexarg(arg, maxdigits, valp)
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12 char *arg;
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13 int maxdigits;
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14 u_long *valp;
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15 {
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16 char *cp = arg, *bp;
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17 int len;
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18
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19 if (cp[0] == '0' && (cp[1] == 'x' || cp[1] == 'X'))
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20 cp += 2;
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21 for (bp = cp; *cp; cp++)
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22 if (!isxdigit(*cp))
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23 return(-1);
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24 len = cp - bp;
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25 if (len < 1 || len > maxdigits)
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26 return(-1);
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27 *valp = strtoul(arg, 0, 16);
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28 return(0);
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29 }