FreeCalypso > hg > freecalypso-tools
view target-utils/libcommon/hexarg.c @ 0:e7502631a0f9
initial import from freecalypso-sw rev 1033:5ab737ac3ad7
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sat, 11 Jun 2016 00:13:35 +0000 |
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/* * Many commands take hex arguments. This module contains the parse_hexarg() * function, which is a wrapper around strtoul that performs some additional * checks. */ #include <sys/types.h> #include <ctype.h> #include <stdlib.h> parse_hexarg(arg, maxdigits, valp) char *arg; int maxdigits; u_long *valp; { char *cp = arg, *bp; int len; if (cp[0] == '0' && (cp[1] == 'x' || cp[1] == 'X')) cp += 2; for (bp = cp; *cp; cp++) if (!isxdigit(*cp)) return(-1); len = cp - bp; if (len < 1 || len > maxdigits) return(-1); *valp = strtoul(arg, 0, 16); return(0); }